CN107674767B

CN107674767B - Automobile three-way catalyst cleaning agent and preparation method thereof

Info

Publication number: CN107674767B
Application number: CN201610624261.XA
Authority: CN
Inventors: 钱伟
Original assignee: Beijing Haotian Hongyun Chemical Technology Co ltd
Current assignee: Beijing Haotian Hongyun Chemical Technology Co ltd
Priority date: 2016-08-02
Filing date: 2016-08-02
Publication date: 2020-12-08
Anticipated expiration: 2036-08-02
Also published as: CN107674767A

Abstract

The invention discloses a cleaning agent for an automobile three-way catalyst, which comprises the following components in parts by weight: 8-30 parts of a carbon dissolving agent; 32-70 parts of organic acid; 10-80 parts of a fatty acid condensate; 5-50 parts of a sodium salt surfactant; 1-14 parts of long-chain alkyl quaternary ammonium salt; 1-4 parts of chelating agent cetyl trimethyl ammonium bromide; 4-16 parts of limonene; 740 and 930 parts of softened water, wherein the carbon dissolving agent comprises cyclohexane and nano titanium dioxide. The cleaning agent has good cleaning effect at room temperature and under the condition that the three-way catalyst cannot be cooled after the automobile is started.

Description

Automobile three-way catalyst cleaning agent and preparation method thereof

Technical Field

The invention relates to the technical field of automobile cleaning agents, in particular to an automobile three-way catalyst cleaning agent and a preparation method thereof.

Background

The three-way catalyst is installed in an exhaust system of an automobile and is used for reducing most of exhaust pollutants such as hydrocarbon, carbon monoxide, nitrogen oxide and the like discharged by an engine. When an automobile engine exhausts through an exhaust pipe, when three gases of carbon monoxide, hydrocarbon and oxynitride are coated with grids which take rare noble metals such as rhodium, platinum and palladium layers as catalysts respectively at intervals through an automobile three-way catalyst, the activity of the three gases is enhanced, and oxidation-reduction chemical reaction is carried out through combustion in the automobile three-way catalyst, wherein the carbon monoxide is oxidized into colorless and nontoxic carbon dioxide gas at high temperature, the hydrocarbon is oxidized into water and carbon dioxide at high temperature, and the oxynitride is reduced into nitrogen and oxygen at high temperature, so that the exhaust is purified.

The catalyst is very sensitive to elements such as sulfur, lead, phosphorus, zinc and the like, wherein the sulfur and the lead come from gasoline, the phosphorus and the zinc come from lubricating oil, and the four substances and oxide particles formed after the four substances and the substances are combusted are easily adsorbed on the surface of the catalyst, so that the catalyst cannot contact with exhaust gas to lose the catalytic action; under the condition that an automobile works at a low temperature for a long time or the engine cannot work normally, the engine can discharge a large amount of soot to adsorb the surface of a three-way catalyst, so that the catalyst cannot contact with exhaust gas, the soot is accumulated for a long time, colloid deposition carbide is generated to block pores of a carrier, even the three-way catalyst is scrapped, further the oil consumption of the automobile is increased, the power is reduced, the tail gas exceeds the standard, and the like, and the exhaust pipe is burned red to cause the spontaneous combustion of the automobile in serious cases.

At present, chinese patent application publication No. CN103756806A discloses a three-way catalyst cleaning agent, which comprises: 3 to 8 weight percent of tartaric acid; 5 wt% -10 wt% of citric acid; 8 wt% -18 wt% of glacial acetic acid; 3 wt% -6 wt% of malic acid; 10-50 wt% of scale and corrosion inhibitor; 0.06 wt% -0.20 wt% of EDTA; 15 wt% -50 wt% of deionized water. Although various raw materials adopted by the cleaning agent interact with each other, the cleaning agent has a good cleaning effect and can be cleaned at room temperature, the cleaning agent needs to be used after the three-way catalyst is cooled to below 50 ℃, and the three-way catalyst cannot be cooled in time and needs to be cleaned after an automobile is started in many emergency situations, so that the cleaning agent with good cleaning effect at different temperatures needs to be developed.

Disclosure of Invention

The invention aims to provide a cleaning agent for an automobile three-way catalyst, which has a good cleaning effect at room temperature and under the condition that the three-way catalyst is not cooled after an automobile is started.

In order to achieve the purpose, the invention provides the following technical scheme:

the cleaning agent for the three-way catalyst of the automobile comprises the following components in parts by weight:

the carbon dissolving agent comprises cyclohexane and nano titanium dioxide.

The organic acid can effectively remove surface coverings such as sulfur, phosphorus complexes and carbon deposition compounds in the three-way catalyst under the normal temperature condition, preferably, the organic acid comprises at least one of citric acid, tartaric acid, glacial acetic acid and malic acid, the organic weak acids can not break a catalyst and a carrier in the three-way catalyst while cleaning the three-way catalyst, the limonene has super strong dissolving capacity on oily dirt, preferably, the carbon dissolving agent also comprises fumed silica with strong surface adsorption capacity, good dispersing performance and good stability, the organic weak acids are matched to uniformly disperse the surface coverings after the limonene is matched to dissolve the surface coverings, and the covering can be rapidly cleaned by matching the organic weak acids, and the carbon dissolving agent is composed of the following components in parts by weight: 4-10 parts of cyclohexane, 2-10 parts of nano titanium dioxide and 2-10 parts of fumed silica, wherein the fumed silica and the nano titanium dioxide can reduce the abrasion on the surface of the three-way catalyst during cleaning, the foaming degree can be reduced by matching the cyclohexane with the fumed silica, and the influence of the fumed silica on the viscosity of a system is added, so that a water-saving function is provided; the cleaning agent can be easily introduced into the three-way catalyst and discharged when the waste gas is cleaned again, the waste gas is prevented from blocking the three-way catalyst again when being cleaned again, a large amount of alkyl free radicals can be generated when the cyclohexane is heated, meanwhile, the nano titanium dioxide and the cyclohexane interact under the high-temperature environment to generate superoxide ion free radicals and hydroxyl free radicals with strong oxidation effect, the combination of the alkyl free radicals, the superoxide ion free radicals and the hydroxyl free radicals can quickly and effectively clean the surface covering matter, and meanwhile, the superoxide ion free radicals and the hydroxyl free radicals can convert harmful substances in the waste gas such as hydrocarbon, carbon monoxide, oxynitride and the like into harmless water, carbon dioxide and nitrogen dioxide, further preventing the three-way catalyst from being blocked again when the exhaust gas is cleaned again, so that the cleaning agent has good cleaning effect at room temperature and under the condition that the three-way catalyst is not cooled after the automobile is started.

Preferably, the cleaning agent also comprises 1-2 parts of scented tea, the scented tea is used as a natural raw material and can reduce waste gas and peculiar smell generated by a covering material while cleaning, meanwhile, a non-compound surfactant tea saponin in the scented tea can generate foam, acidic gas overflows when organic acid is sealed to clean the covering material on the surface, and the acidic gas is favorable for dissolving the covering material on the surface under a high-temperature environment, so that the cleaning agent has a good cleaning effect under the condition that the three-way catalyst is not cooled, and the cleaning speed is further increased.

Preferably, the fatty acid condensate comprises fatty acid polyglycol ester, fatty acid amide polyglycol ether, fatty acid diethanolamide and sodium salt of fatty acid sulfosuccinate, and as a non-surfactant, the fatty acid condensate can effectively reduce surface tension, has emulsifying capacity for oily dirt, and has extremely strong cleaning capacity for surface covering by being matched with limonene; preferably, the sodium salt surfactant comprises 2-20 parts of sodium dodecyl sulfate and 5-30 parts of alkylphenol ether sulfosuccinate sodium salt, wherein the sodium dodecyl sulfate is an anionic surfactant, has high biodegradability, low environmental pollution and good purification effect at low temperature, the alkylphenol ether sulfosuccinate sodium salt is a non-surfactant, has good complex compatibility with anionic and nonionic surfactants, effectively reduces the number of foams, and can reduce the water consumption and improve the water conservation performance while ensuring good cleaning capability by matching with a fatty acid condensate; because of the good acid environment provided by the scented tea, the fatty acid condensation compound has good compatibility effect with the sodium dodecyl sulfate in the acid environment, and meanwhile, the compatibility with other substances serving as an active agent is improved, so that the surface covering material can be completely dissolved in low carbon and high carbon, and the cleaning capability is greatly improved.

The preparation method of the cleaning agent for the automobile three-way catalyst comprises the following steps:

step 1: placing scented tea and softened water into a container, boiling to obtain scented tea water,

the specific operation is as follows:

p1: placing scented tea and softened water into a container, boiling, and keeping the boiling state for 20 minutes to obtain scented tea water with scented tea;

p2: filtering out scented tea from the scented tea water obtained from P1 to obtain scented tea water without solid residue;

p3: keeping the scented tea water obtained from the P2 at 60 ℃ for later use;

step 2: mixing a chelating agent cetyl trimethyl ammonium bromide with softened water, and uniformly stirring;

and step 3: adding a carbon dissolving agent, organic acid and limonene into the mixture obtained in the step 2 in sequence, and uniformly stirring;

and 4, step 4: adding the scented tea water obtained in the step 1, and uniformly stirring;

and 5: sequentially adding the fatty acid condensation compound, the sodium salt surfactant and the long-chain alkyl quaternary ammonium salt, and uniformly stirring.

In the preparation process, the scented tea water is boiled for 20 minutes in the step 1, so that the tea saponin in the scented tea can be fully dissolved in the scented tea water, the heat is preserved at 60 ℃, and on the premise of preventing the scented tea water from volatilizing in a large amount, all components are mixed at a higher temperature, so that the compounding of the surfactant and the full mixing of other components are facilitated; in the step 3, organic acid and limonene are added firstly to provide an acidic environment, in the step 4, scented tea water at 60 ℃ is added to provide a temperature environment, so that when the surfactant is added in the step 5, all the components can be fully mixed and compounded, and the optimal cleaning effect is achieved.

Preferably, the cleaning agent for the automobile three-way catalyst comprises the following components in parts by weight: 20 parts of carbon dissolving agent, 50 parts of organic acid, 44 parts of fatty acid condensate, 26 parts of sodium salt surfactant, 8 parts of long-chain alkyl quaternary ammonium salt, 2 parts of chelating agent cetyl trimethyl ammonium bromide, 10 parts of limonene, 840 parts of softened water and 2 parts of scented tea.

The invention has the advantages that:

1. the three-way catalytic converter can be cleaned when the temperature of the automobile cannot be reduced in time after the automobile is started, and the three-way catalytic converter is prevented from being blocked again when waste gas is cleaned again, so that a good cleaning effect is achieved;

2. the surface covering material has strong solubility in normal temperature and low temperature environment, and the dissolved surface covering material can be effectively dispersed, so that the effects of quick cleaning and thorough cleaning are achieved, and the surface covering material is prevented from blocking the three-way catalyst in the cleaning process;

3. on the premise of ensuring good cleaning effect, the foam amount is effectively reduced, so that the water consumption is reduced, and the water-saving effect is achieved;

4. the environment-friendly material is used, the biodegradability is good, and the pollution to the environment is greatly reduced.

Drawings

FIG. 1 is a flow chart of a preparation process of the cleaning agent for the three-way catalyst of the automobile.

Detailed Description

The invention is further illustrated by the following examples. It should be understood that the preparation methods described in the examples are only for illustrating the present invention and are not to be construed as limiting the present invention, and that the simple modifications of the preparation methods of the present invention based on the concept of the present invention are within the scope of the present invention as claimed.

All materials referred to in the examples of the present invention are commercially available.

The test vehicle type in the embodiment of the invention and the comparative example is 1.8 Tpasart, the three-way catalyst uses an Euro 3 carrier, the mesh number of the carrier is 400, and the national standard emission standard is as follows: 0.2g/kWh of hydrocarbon, 2.3g/kWh of carbon monoxide and 0.15g/kWh of nitrogen oxide.

The first embodiment is as follows:

(1) placing 2g of scented tea and 500g of softened water into a container, boiling, and keeping the boiling state for 20 minutes to obtain scented tea water with scented tea;

(2) filtering out scented tea in the scented tea water obtained in the step (1) to obtain scented tea water without solid residues;

(3) keeping the scented tea water obtained in the step (2) at 60 ℃ for later use;

(4) mixing 3g of chelating agent cetyl trimethyl ammonium bromide with 430g of softened water, and uniformly stirring;

(5) adding 10g of cyclohexane, 6g of nano titanium dioxide, 6g of fumed silica, 10g of tartaric acid, 11g of glacial acetic acid, 11g of malic acid and 16g of limonene into the mixture obtained in the step (4) in sequence, and uniformly stirring;

(6) adding the scented tea water obtained in the step (3), and uniformly stirring;

(7) and sequentially adding 20g of fatty acid polyglycol ester, 20g of fatty acid amide polyglycol ether, 20g of fatty acid diethanolamide, 20g of sodium salt of fatty acid sulfosuccinate, 20g of sodium dodecyl sulfate, 18g of sodium salt of alkylphenol ether sulfosuccinate and 14g of long-chain alkyl quaternary ammonium salt, and uniformly stirring.

Example two:

(1) placing 1g of scented tea and 400g of softened water into a container, boiling, and keeping the boiling state for 20 minutes to obtain scented tea water with scented tea;

(4) mixing 1g of chelating agent cetyl trimethyl ammonium bromide and 340g of softened water, and uniformly stirring;

(5) adding 4g of cyclohexane, 10g of nano titanium dioxide, 2g of fumed silica, 20g of citric acid, 25g of tartaric acid, 25g of malic acid and 10g of limonene into the mixture obtained in the step (4) in sequence, and uniformly stirring;

(7) sequentially adding 2g of fatty acid polyglycol ester, 3g of fatty acid amide polyglycol ether, 2g of fatty acid diethanolamide, 3g of fatty acid sulfosuccinate sodium salt, 2g of sodium dodecyl sulfate, 5g of alkylphenol ether sulfosuccinate sodium salt and 1g of long-chain alkyl quaternary ammonium salt, and uniformly stirring.

Example three:

(1) placing 1.5g of scented tea and 450g of softened water into a container, boiling, and keeping the boiling state for 20 minutes to obtain scented tea water with scented tea;

(4) 4g of chelating agent cetyl trimethyl ammonium bromide is mixed with 400g of softened water and stirred uniformly;

(5) adding 6g of cyclohexane, 2g of nano titanium dioxide, 10g of fumed silica, 27g of citric acid, 28g of glacial acetic acid and 4g of limonene into the mixture obtained in the step (4) in sequence, and stirring uniformly;

(7) adding 10g of fatty acid polyglycol ester, 10g of fatty acid amide polyglycol ether, 8g of fatty acid diethanolamide, 9g of fatty acid sulfosuccinate sodium salt, 11g of sodium dodecyl sulfate, 30g of alkylphenol ether sulfosuccinate sodium salt and 7g of long-chain alkyl quaternary ammonium salt in sequence, and uniformly stirring.

Example four:

(1) placing 2g of scented tea and 420g of softened water into a container, boiling, and keeping the boiling state for 20 minutes to obtain scented tea water with scented tea;

(4) 2g of chelating agent cetyl trimethyl ammonium bromide is mixed with 420g of softened water and stirred uniformly;

(5) adding 9g of cyclohexane, 5g of nano titanium dioxide, 6g of fumed silica, 12g of citric acid, 13g of tartaric acid, 10g of glacial acetic acid, 15g of malic acid and 10g of limonene into the mixture obtained in the step (4) in sequence, and uniformly stirring;

(7) adding 11g of fatty acid polyglycol ester, 11g of fatty acid amide polyglycol ether, 11g of fatty acid diethanolamide, 11g of sodium salt of fatty acid sulfosuccinate, 8g of sodium dodecyl sulfate, 18g of sodium salt of alkylphenol ether sulfosuccinate and 8g of long-chain alkyl quaternary ammonium salt in sequence, and stirring uniformly.

Table 1 performance testing of each of the examples one to four

Before cleaning, the oil consumption of a test vehicle in one hundred kilometers is 13 liters in the normal running process, and the exhaust emission is as follows: 0.21g/kWh of hydrocarbon, 2.5g/kWh of carbon monoxide and 0.16g/kWh of nitrogen oxide, which seriously exceed the emission standards, because the surface of the three-way catalyst is covered with a covering substance to influence the emission period and the purification effect on the exhaust gas, it can be seen from Table 1 that no matter the three-way catalyst is cleaned immediately after the automobile is started or the three-way catalyst is cleaned at normal temperature, the oil consumption of the cleaned automobile is reduced, and the content of various pollutants in the exhaust gas is greatly reduced, so that the surface covering substance of the three-way catalyst is cleaned, and the carrier and the catalyst of the catalyst are not damaged and still have the purification function; according to the test results, the fourth embodiment has better performance, so the preferred mixture ratio of the components of the invention is as follows: 20 parts of carbon dissolving agent, 50 parts of organic acid, 44 parts of fatty acid condensate, 26 parts of sodium salt surfactant, 8 parts of long-chain alkyl quaternary ammonium salt, 2 parts of chelating agent cetyl trimethyl ammonium bromide, 10 parts of limonene, 840 parts of softened water and 2 parts of scented tea.

Comparative example one: the difference from the fourth embodiment is that no nano titanium dioxide is added.

Comparative example two: the difference from example four is that no limonene was added.

Comparative example three:

(1) 2g of chelating agent cetyl trimethyl ammonium bromide is mixed with 840g of softened water and stirred uniformly;

(2) adding 9g of cyclohexane, 5g of nano titanium dioxide, 6g of fumed silica, 12g of citric acid, 13g of tartaric acid, 10g of glacial acetic acid, 15g of malic acid and 10g of limonene into the mixture obtained in the step (1) in sequence, and uniformly stirring;

(3) adding 11g of fatty acid polyglycol ester, 11g of fatty acid amide polyglycol ether, 11g of fatty acid diethanolamide, 11g of sodium salt of fatty acid sulfosuccinate, 8g of sodium dodecyl sulfate, 18g of sodium salt of alkylphenol ether sulfosuccinate and 8g of long-chain alkyl quaternary ammonium salt in sequence, and stirring uniformly.

The difference between the comparative example and the fourth example is that scented tea is not added.

Comparative example four: the difference from the third comparative example is that no limonene or nano titanium dioxide is added.

Comparative example five:

chinese patent application publication No. CN103756806A discloses a three-way catalyst cleaning agent, which includes the following embodiments:

12.5g of tartaric acid; 15g of citric acid; 25g of glacial acetic acid; 12.5g malic acid; 100g hydroxyethylidene diphosphonic acid; 0.25g of EDTA and 84.75g of deionized water are uniformly mixed to obtain the three-way catalyst cleaning agent.

Table 2 various performance tests for each comparative example and example four

As can be seen from comparison of tables 1 and 2, the addition of any one of the limonene, the nano titanium dioxide and the scented tea alone has a certain cleaning effect on the surface covering of the three-way catalyst according to certain improvement on oil consumption and the amount of tail gas pollutants, but the effect is not obvious; in the comparative example without adding the three components of the limonene, the nano titanium dioxide and the scented tea, after the automobile is started and is immediately cleaned without being cooled, the improvement of each performance is very weak, which shows that the cleaning of the three-way catalyst has no effect basically under the condition; in contrast, the test results of the fourth example show that the oil consumption and the content of the exhaust pollutants are improved remarkably, which indicates that the surface covering of the three-way catalyst is cleaned more thoroughly without damaging the three-way catalyst, so that the cleaning agent has a good cleaning effect at room temperature and under the condition that the three-way catalyst is not cooled after the automobile is started compared with the prior art.

Claims

1. The cleaning agent for the automobile three-way catalyst is characterized by comprising the following components in parts by weight: comprises the following components in parts by weight:

8-30 parts of a carbon dissolving agent;

32-70 parts of organic acid;

10-80 parts of a fatty acid condensate;

5-50 parts of a sodium salt surfactant;

1-14 parts of long-chain alkyl quaternary ammonium salt;

1-4 parts of chelating agent cetyl trimethyl ammonium bromide;

4-16 parts of limonene;

740 and 930 parts of demineralized water;

the carbon dissolving agent comprises cyclohexane, nano titanium dioxide and fumed silica;

also comprises 1-2 parts of scented tea;

wherein the fatty acid condensate comprises fatty acid polyglycol ester, fatty acid amide polyglycol ether, fatty acid diethanolamide and sodium salt of fatty acid sulfosuccinate;

the sodium salt surfactant comprises 2-20 parts of sodium dodecyl sulfate and 5-30 parts of alkylphenol ether sulfosuccinate sodium salt;

the organic acid comprises at least one of citric acid, tartaric acid, glacial acetic acid and malic acid.

2. The cleaning agent for the automobile three-way catalyst according to claim 1, wherein the cleaning agent comprises the following components in percentage by weight: the carbon dissolving agent comprises the following components in parts by weight: 4-10 parts of cyclohexane, 2-10 parts of nano titanium dioxide and 2-10 parts of fumed silica.

3. The cleaning agent for the automobile three-way catalyst according to claim 1, wherein the cleaning agent comprises the following components in percentage by weight: the cleaning agent for the three-way catalyst of the automobile comprises the following components in parts by weight: 20 parts of carbon dissolving agent, 50 parts of organic acid, 44 parts of fatty acid condensate, 26 parts of sodium salt surfactant, 8 parts of long-chain alkyl quaternary ammonium salt, 2 parts of chelating agent cetyl trimethyl ammonium bromide, 10 parts of limonene, 840 parts of softened water and 2 parts of scented tea.

4. A preparation method for preparing the cleaning agent for the three-way catalyst of the automobile as claimed in any one of claims 1 to 3 is characterized by comprising the following steps:

step 1: placing scented tea and softened water into a container, and boiling to obtain scented tea water for later use;

5. The preparation method of the cleaning agent for the automobile three-way catalyst according to claim 4, characterized by comprising the following steps: the step 1 comprises the following steps:

p3: and keeping the scented tea water obtained from the P2 at 60 ℃ for later use.