阅读说明：本技术 生产硅油废气的处理方法 (Treatment method of waste gas from silicone oil production ) 是由 檀忠亮 于 2021-07-08 设计创作，主要内容包括：本发明公开一种生产硅油废气的处理方法,涉及废气处理技术领域。所述生产硅油废气的处理方法包括以下步骤：S10、将生产硅油废气用于制备四甲基氢氧化铵,得到四甲基氢氧化铵和剩余气体；S20、将所述剩余气体冷却,得到冷却气体；S30、将所述冷却气体依次通入酸溶液、甲醇溶液中后,得到净化气体。一方面利用了废气中的余热,减小了四甲基氢氧化铵制备过程中的能量损耗；另一方面利用废气中的甲醇和三甲胺制备四甲基氢氧化铵,制备的四甲基氢氧化铵可以重新作生产硅油的催化剂,实现了甲醇和三甲胺及四甲基氢氧化铵的循环利用,符合可持续发展要求。(The invention discloses a method for treating waste gas generated in silicone oil production, and relates to the technical field of waste gas treatment. The treatment method for the waste gas generated in the production of the silicone oil comprises the following steps: s10, using the waste gas from silicone oil production to prepare tetramethylammonium hydroxide to obtain tetramethylammonium hydroxide and residual gas; s20, cooling the residual gas to obtain a cooling gas; and S30, sequentially introducing the cooling gas into an acid solution and a methanol solution to obtain a purified gas. On one hand, the waste heat in the waste gas is utilized, and the energy loss in the preparation process of the tetramethylammonium hydroxide is reduced; on the other hand, the methyl alcohol and the trimethylamine in the waste gas are used for preparing the tetramethylammonium hydroxide, and the prepared tetramethylammonium hydroxide can be used as a catalyst for producing the silicone oil again, so that the cyclic utilization of the methyl alcohol, the trimethylamine and the tetramethylammonium hydroxide is realized, and the sustainable development requirement is met.)

1. The method for treating waste gas generated in silicone oil production is characterized by comprising the following steps of:

s10, using the waste gas from silicone oil production to prepare tetramethylammonium hydroxide to obtain tetramethylammonium hydroxide and residual gas;

s20, cooling the residual gas to obtain a cooling gas;

and S30, sequentially introducing the cooling gas into an acid solution and a methanol solution to obtain a purified gas.

2. The method for treating waste gas generated in the production of silicone oil according to claim 1, wherein step S10 includes:

s11, under the pressurization condition, after heating and reacting the waste gas generated in the production of the silicone oil with dimethyl carbonate, releasing the pressure to obtain a mixture and residual gas;

s12, distilling the mixture under reduced pressure to obtain a first intermediate, adding water into the first intermediate, and performing hydrolysis reaction at 85-95 ℃ to obtain a second intermediate;

and S13, electrolyzing the second intermediate to obtain the tetramethylammonium hydroxide.

3. The method for treating waste gas from the production of silicone oil according to claim 2, wherein in step S11,

the heating temperature is 100-145 ℃; and/or the presence of a gas in the gas,

the reaction time is 6-7 h; and/or the presence of a gas in the gas,

the pressurizing pressure is 2.8-3.8 MPa.

4. The method for treating waste gas generated in silicone oil production according to claim 2, wherein in step S12, the vacuum degree of the reduced pressure distillation is 0.02 to 0.04 MPa.

5. The method for treating waste gas from the production of silicone oil according to claim 2, wherein in step S12,

the ratio of the mass of the first intermediate to the mass of water is 1: (3-5); and/or the presence of a gas in the gas,

the hydrolysis reaction time is 3-5 h.

6. The method for treating waste gas generated in the production of silicone oil according to claim 2, wherein in step S13, the concentration of the second intermediate during electrolysis is 0.5-0.8 mol/L.

7. The method for treating waste gas from the production of silicone oil according to claim 1, wherein in step S20,

the cooling medium is water; and/or the presence of a gas in the gas,

the temperature of the cooling gas is 15-25 ℃.

8. The method for treating waste gas generated in the production of silicone oil according to claim 1, wherein in step S30, the introducing the acid solution comprises sequentially introducing a hydrochloric acid solution and a sulfuric acid solution.

9. The method for treating waste gas generated in the production of silicone oil according to claim 8, wherein the concentration of the hydrochloric acid solution is 2-3 mol/L.

10. The method for treating waste gas generated in the production of silicone oil according to claim 8, wherein the concentration of the sulfuric acid solution is 3-5 mol/L.

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a method for treating waste gas generated in silicone oil production.

Background

The silicone oil is polysiloxane with chain structures of different polymerization degrees, has excellent heat resistance, electric insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, and also has low viscosity-temperature coefficient, higher compression resistance and radiation resistance of certain varieties; silicone oils also have many specific properties, such as oxidation resistance, high flash point, low volatility, no corrosion to metals, non-toxicity, etc., and are commonly used as high-grade lubricating oils, shock-resistant oils, insulating oils, defoamers, mold release agents, polishing agents, vacuum diffusion pump oils, etc.

In the production process of silicone oil, an alkaline catalyst is often needed, tetramethylammonium hydroxide is an alkaline catalyst with excellent performance, however, the tetramethylammonium hydroxide is often decomposed into methanol and trimethylamine at 135-150 ℃ to generate waste gas, the existing waste gas treatment method is usually to introduce the waste gas into an acid solution for absorption, and the catalyst needs to be continuously supplied, which is relatively waste.

Disclosure of Invention

The invention mainly aims to provide a method for treating waste gas generated in silicone oil production, and aims to provide a method for treating waste gas generated in silicone oil production, so that the cyclic utilization of a catalyst tetramethylammonium hydroxide is realized, and the waste is reduced.

In order to achieve the aim, the invention provides a method for treating waste gas generated in the production of silicone oil, which comprises the following steps:

s10, using the waste gas from silicone oil production to prepare tetramethylammonium hydroxide to obtain tetramethylammonium hydroxide and residual gas;

s20, cooling the residual gas to obtain a cooling gas;

and S30, sequentially introducing the cooling gas into an acid solution and a methanol solution to obtain a purified gas.

Optionally, step S10 includes:

s11, under the pressurization condition, after heating and reacting the waste gas generated in the production of the silicone oil with dimethyl carbonate, releasing the pressure to obtain a mixture and residual gas;

s12, distilling the mixture under reduced pressure to obtain a first intermediate, adding water into the first intermediate, and performing hydrolysis reaction at 85-95 ℃ to obtain a second intermediate;

and S13, electrolyzing the second intermediate to obtain the tetramethylammonium hydroxide.

Alternatively, in step S11,

the heating temperature is 100-145 ℃; and/or the presence of a gas in the gas,

the reaction time is 6-7 h; and/or the presence of a gas in the gas,

the pressurizing pressure is 2.8-3.8 MPa.

Optionally, in step S12, the vacuum degree of the reduced pressure distillation is 0.02-0.04 MPa.

Alternatively, in step S12,

the ratio of the mass of the first intermediate to the mass of water is 1: (3-5); and/or the presence of a gas in the gas,

the hydrolysis reaction time is 3-5 h.

Optionally, in step S13, the concentration of the second intermediate is 0.5 to 0.8mol/L during electrolysis.

Alternatively, in step S20,

the cooling medium is water; and/or the presence of a gas in the gas,

the temperature of the cooling gas is 15-25 ℃.

Optionally, in step S30, the introducing the acid solution includes sequentially introducing a hydrochloric acid solution and a sulfuric acid solution.

Optionally, the concentration of the hydrochloric acid solution is 2-3 mol/L.

Optionally, the concentration of the sulfuric acid solution is 3-5 mol/L.

In the technical scheme, the invention provides a treatment method of waste gas generated in silicone oil production, wherein the waste gas is directly used for preparing tetramethylammonium hydroxide, so that on one hand, the waste heat in the waste gas is utilized, and the energy loss in the preparation process of the tetramethylammonium hydroxide is reduced; on the other hand, the methyl alcohol and the trimethylamine in the waste gas are used for preparing the tetramethylammonium hydroxide, and the prepared tetramethylammonium hydroxide can be reused as a catalyst for producing the silicone oil, so that the cyclic utilization of the methyl alcohol, the trimethylamine and the tetramethylammonium hydroxide is realized, the waste is reduced, and the sustainable development requirement is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow chart of an embodiment of the method for treating waste gas generated in the production of silicone oil according to the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front, rear, outer and inner … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

In the production process of silicone oil, an alkaline catalyst is often needed, tetramethylammonium hydroxide is an alkaline catalyst with excellent performance, however, the tetramethylammonium hydroxide is often decomposed into methanol and trimethylamine at 135-150 ℃ to generate waste gas, the existing waste gas treatment method is usually to introduce the waste gas into an acid solution for absorption, and the catalyst needs to be continuously supplied, which is relatively waste.

In view of this, the invention provides a method for treating waste gas from silicone oil production, and aims to provide a method for treating waste gas from silicone oil production, so as to realize the recycling of catalyst tetramethylammonium hydroxide and reduce waste. In the attached drawings, fig. 1 is a schematic flow chart of an embodiment of a treatment method for waste gas generated in silicone oil production provided by the invention.

The invention provides a method for treating waste gas generated in silicone oil production, which comprises the following steps:

s10, using the waste gas from the production of the silicone oil to prepare tetramethylammonium hydroxide to obtain tetramethylammonium hydroxide and residual gas.

The present invention is not limited to the method for preparing tetramethylammonium hydroxide, and for example, precipitation method, ion exchange resin method, addition method, ion membrane electrolysis method, etc. preferably, the present invention employs ion membrane electrolysis method, which is simpler and produces tetramethylammonium hydroxide with higher purity, and specifically, step S10 includes:

s11, under the pressurization condition, after the waste gas generated in the production of the silicone oil and the dimethyl carbonate are heated and reacted, releasing the pressure to obtain a mixture and residual gas.

The temperature of the waste gas generated in the production of silicone oil is generally above 100 ℃, the waste gas contains trimethylamine and methanol, the trimethylamine is used as a reactant, the methanol is liquefied under a pressurizing condition and is used as a polar solvent for the reaction of the trimethylamine and dimethyl carbonate, and the following reactions are promoted under a heating and pressurizing condition:

(CH₃)₃N+CH₃OCOOCH₃→(CH₃)₄NOCOOCH₃

it can be understood that when the content of methanol in the waste gas from the production of silicone oil is too low to dissolve trimethylamine and dimethyl carbonate, a certain amount of methanol can be added, and when the content of methanol is high to make the concentration of trimethylamine and dimethyl carbonate lower, trimethylamine and dimethyl carbonate can be added for adjustment.

Preferably, the heating temperature is 100-145 ℃, the reaction can be carried out in a high-pressure reaction kettle, the temperature of the waste gas for producing the silicone oil is generally above 100 ℃, the energy used for heating materials can be saved, the waste gas is introduced into the high-pressure reaction kettle, dimethyl carbonate is added, and heating and pressurization are carried out according to the temperature in the reaction kettle.

The pressure to be applied is preferably 2.8 to 3.8MPa, and may be, for example, 2.8MPa, 2.9MPa, 3MPa, 3.1MPa, 3.2MPa, 3.3MPa, 3.4MPa, 3.5MPa, 3.6MPa, 3.7MPa, or 3.8MPa, and the reaction is relatively rapid and sufficient under the above-mentioned pressure.

In the embodiment of the invention, the waste gas generated in the production of silicone oil is introduced into the autoclave, dimethyl carbonate is added, after the materials are added, the pressure is increased to the preset pressure, and then the temperature is increased to the preset temperature.

The reaction time is not limited in the present invention, and preferably, the reaction time is 6 to 7 hours, for example, 6 hours, 6.5 hours, 7 hours, etc., and studies show that the reaction is sufficient within the above reaction time range.

The resulting residual gas may be directly subjected to step S20.

S12, distilling the mixture under reduced pressure to obtain a first intermediate, adding water into the first intermediate, and performing hydrolysis reaction at 85-95 ℃ to obtain a second intermediate.

In this step, the resulting mixture is separated to obtain the first intermediate (CH)₃)₄NOCOOCH₃And the separation adopts a reduced pressure distillation mode, the pressure in the system is reduced by means of a vacuum pump, the boiling point of the liquid is reduced, and preferably, in the embodiment of the invention, the vacuum degree of the reduced pressure distillation is 0.02-0.04 MPa. For example, the pressure may be 0.02MPa, 0.03MPa, 0.04MPa or the like, and the first intermediate may be distilled off from the mixture under the above-mentioned vacuum.

The first intermediate (CH)₃)₄NOCOOCH₃Hydrolysis to obtain the second intermediate (CH)₃)₄NOCOOH, the reaction equation for which is as follows:

(CH₃)₄NOCOOCH₃+H₂O→(CH₃)₄NOCOOH+CH₃OH

the reaction needs to be carried out at 85-95 ℃, the hydrolysis reaction is sufficient at the temperature, the hydrolysis reaction time is preferably 3-5 h, such as 3h, 4h, 5h and the like, and researches show that the conversion rate is higher and reaches more than 90% after the time.

Furthermore, preferably, the ratio of the mass of the first intermediate to the mass of water is 1: (3-5), such as 1:3, 1:4, 1:5, etc., within the above-mentioned proportion range, the first intermediate is hydrolyzed more rapidly and sufficiently.

And S13, electrolyzing the second intermediate to obtain the tetramethylammonium hydroxide.

The principle of electrolysis of the second intermediate is: the anode of the water molecule loses electrons and generates H⁺And O₂，H⁺And HCO₃ ^-Reaction to form H₂O and CO₂Dissociation of (CH)₃)₄N⁺And H of the cathode₂O to obtain electron precipitation H₂Free OH^-Under the action of an electric field force, (CH)₃)₄N⁺Passes through the cation exchange membrane to the cathode, and combines OH^-To obtain (CH)₃)₄NOH。

It is understood that the second intermediate needs to be dissolved in water before the second intermediate is electrolyzed, and preferably, when the second intermediate is electrolyzed, the concentration of the second intermediate is 0.5-0.8 mol/L, for example, 0.5mol/L, 0.6mol/L, 0.7mol/L, 0.8mol/L, etc., and the concentration range has a high rate of generating tetramethylammonium hydroxide by electrolysis.

The reaction equation of the electrolysis process is as follows:

(CH₃)₄NOCOOH+2H₂O→(CH₃)₄NOH+O₂+CO₂+H₂

in the electrolysis process, the electrolysis products are hydrogen, oxygen and carbon dioxide, can be directly discharged, do not need to be treated by tail gas, and are more green and sustainable.

It is understood that when the content of trimethylamine and methanol in the waste gas from the production of silicone oil is low, the step S10 can be performed after the continuously generated waste gas from the production of silicone oil is enriched with trimethylamine and methanol after the production of silicone oil is continued for a certain period of time.

And S20, cooling the residual gas to obtain a cooling gas.

The residual gas mainly contains trimethylamine, methanol and dimethyl carbonate which do not participate in the reaction, the gas can be cooled firstly, the cooling can be carried out by a heat exchanger, the cooling medium is preferably water, the specific heat capacity of the water is large, the water is cheap and easy to obtain, the temperature of the water passing through the heat exchanger is increased, the water can be used as domestic water, such as bathing and the like, and the heat utilization efficiency is improved.

In addition, the temperature of the obtained cooling gas is preferably 15-25 ℃, and the temperature is basically room temperature, so that the subsequent absorption is convenient.

And S30, sequentially introducing the cooling gas into an acid solution and a methanol solution to obtain a purified gas.

The acid solution is used for absorbing trimethylamine in the residual gas, the methanol solution is used for absorbing organic matters such as methanol, dimethyl carbonate and the like in the residual gas, and the absorption is more sufficient by arranging the two solutions.

Further, in order to sufficiently absorb trimethylamine and prevent air pollution, preferably, the step of introducing the acid solution comprises sequentially introducing a hydrochloric acid solution and a sulfuric acid solution. Acid solution is introduced twice, so that the trimethylamine is removed more fully. More preferably, the concentration of the hydrochloric acid solution is 2-3 mol/L, and the concentration of the sulfuric acid solution is 3-5 mol/L, and researches show that the trimethylamine is sufficiently absorbed at the concentrations.

It is understood that the concentration of hydrochloric acid and the concentration of sulfuric acid may be satisfied at the same time or only one of them, and as a preferred embodiment of the present invention, the above-mentioned both are satisfied at the same time, which is favorable for sufficiently absorbing trimethylamine in the residual gas.

According to the treatment method for producing the silicone oil waste gas, the waste gas is directly used for preparing the tetramethylammonium hydroxide, so that on one hand, the waste heat in the waste gas is utilized, and the energy loss in the preparation process of the tetramethylammonium hydroxide is reduced; on the other hand, the methyl alcohol and the trimethylamine in the waste gas are used for preparing the tetramethylammonium hydroxide, and the prepared tetramethylammonium hydroxide can be used as a catalyst for producing the silicone oil again, so that the cyclic utilization of the methyl alcohol, the trimethylamine and the tetramethylammonium hydroxide is realized, and the sustainable development requirement is met.

An example of the preparation method of the noodles proposed by the present invention is given below:

(1) heating the waste gas generated in the production of the silicone oil and dimethyl carbonate to 100-145 ℃ under the pressure condition of 2.8-3.8 MPa to react for 6-7 h, and releasing the pressure to obtain a mixture and residual gas;

(2) distilling the mixture under reduced pressure at a vacuum degree of 0.02-0.04 MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1 (3-5)), and performing hydrolysis reaction at 85-95 ℃ for 3-5 h to obtain a second intermediate;

(3) electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.5-0.8 mol/L during electrolysis to obtain tetramethyl ammonium hydroxide;

(4) and cooling the residual gas with water to 15-25 ℃, and then sequentially introducing 2-3 mol/L hydrochloric acid solution, 3-5 mol/L sulfuric acid solution and methanol solution to obtain purified gas.

The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.

Example 1

(1) Heating the waste gas from the production of silicone oil and dimethyl carbonate to 100 ℃ under the pressure condition of 2.8MPa to react for 6h, and releasing the pressure to obtain a mixture and residual gas;

(2) distilling the mixture under reduced pressure under the vacuum degree of 0.02MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1: 3), and performing hydrolysis reaction at 85 ℃ for 3h to obtain a second intermediate;

(3) and electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.5mol/L during electrolysis, so as to obtain the tetramethylammonium hydroxide.

(4) And cooling the residual gas to 15 ℃ by using water, and then sequentially introducing 2 mol/L hydrochloric acid solution, 3 mol/L sulfuric acid solution and methanol solution to obtain purified gas.

According to infrared spectrum and nuclear magnetic resonance spectrum analysis, the product obtained in the step (3) is tetramethylammonium hydroxide, and calculation shows that the removal rate of trimethylamine is 97% and the removal rate of methanol is 98% in the purified gas obtained in the step (4).

Example 2

(1) Heating the waste gas from the production of silicone oil and dimethyl carbonate to 145 ℃ under the pressure condition of 3.8MPa to react for 7h, and releasing the pressure to obtain a mixture and residual gas;

(2) distilling the mixture under reduced pressure under the vacuum degree of 0.04MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1: 5), and performing hydrolysis reaction at 95 ℃ for 5h to obtain a second intermediate;

(3) electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.8mol/L during electrolysis to obtain tetramethylammonium hydroxide;

(4) and cooling the residual gas to 25 ℃ by using water, and then sequentially introducing a 3 mol/L hydrochloric acid solution, a 5mol/L sulfuric acid solution and a methanol solution to obtain purified gas.

According to infrared spectrum and nuclear magnetic resonance spectrum analysis, the product obtained in the step (3) is tetramethylammonium hydroxide, and calculation shows that the removal rate of trimethylamine is 98% and the removal rate of methanol is 98% in the purified gas obtained in the step (4).

Example 3

(1) Heating the waste gas from the production of silicone oil and dimethyl carbonate to 125 ℃ under the pressure condition of 3.3MPa to react for 6.5h, and releasing the pressure to obtain a mixture and residual gas;

(2) distilling the mixture under reduced pressure under the vacuum degree of 0.03MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1: 4), and performing hydrolysis reaction at 90 ℃ for 4h to obtain a second intermediate;

(3) electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.6mol/L during electrolysis to obtain tetramethylammonium hydroxide;

(4) and cooling the residual gas to 20 ℃ by using water, and then sequentially introducing 2.5 mol/L hydrochloric acid solution, 4 mol/L sulfuric acid solution and methanol solution to obtain purified gas.

According to infrared spectrum and nuclear magnetic resonance spectrum analysis, the product obtained in the step (3) is tetramethylammonium hydroxide, and calculation shows that the removal rate of trimethylamine is 99% and the removal rate of methanol is 97% in the purified gas obtained in the step (4).

Example 4

(1) Heating the waste gas generated in the production of the silicone oil and dimethyl carbonate to 120 ℃ under the pressure condition of 3.5MPa to react for 6-7 h, and releasing the pressure to obtain a mixture and residual gas;

(2) distilling the mixture under reduced pressure under the vacuum degree of 0.02MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1: 5), and performing hydrolysis reaction for 3h at 88 ℃ to obtain a second intermediate;

(3) electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.7mol/L during electrolysis to obtain tetramethylammonium hydroxide;

(4) and cooling the residual gas to 23 ℃ by using water, and then sequentially introducing a 3 mol/L hydrochloric acid solution, a 3 mol/L sulfuric acid solution and a methanol solution to obtain purified gas.

According to infrared spectrum and nuclear magnetic resonance spectrum analysis, the product obtained in the step (3) is tetramethylammonium hydroxide, and calculation shows that the removal rate of trimethylamine is 96% and the removal rate of methanol is 99% in the purified gas obtained in the step (4).

Example 5

(1) Heating waste gas generated in the production of silicone oil and dimethyl carbonate to 130 ℃ under the pressure condition of 3MPa to react for 7 hours, and releasing the pressure to obtain a mixture and residual gas;

(2) carrying out reduced pressure distillation on the mixture under the vacuum degree of 0.04MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1: 3), and carrying out hydrolysis reaction for 3-5 h at the temperature of 92 ℃ to obtain a second intermediate;

(3) electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.5mol/L during electrolysis to obtain tetramethylammonium hydroxide;

(4) and cooling the residual gas to 17 ℃ by using water, and then sequentially introducing 2 mol/L hydrochloric acid solution, 5mol/L sulfuric acid solution and methanol solution to obtain purified gas.

According to infrared spectrum and nuclear magnetic resonance spectrum analysis, the product obtained in the step (3) is tetramethylammonium hydroxide, and calculation shows that the removal rate of trimethylamine is 98% and the removal rate of methanol is 97% in the purified gas obtained in the step (4).

Example 6

(1) Heating the waste gas from the production of silicone oil and dimethyl carbonate to 140 ℃ under the pressure condition of 3.6MPa to react for 6h, and releasing the pressure to obtain a mixture and residual gas;

(2) distilling the mixture under reduced pressure under the vacuum degree of 0.04MPa to obtain a first intermediate, adding water into the first intermediate (the mass ratio of the first intermediate to the water is 1: 4), and performing hydrolysis reaction for 4h at 86 ℃ to obtain a second intermediate;

(3) electrolyzing the second intermediate, wherein the concentration of the second intermediate is 0.5mol/L during electrolysis to obtain tetramethylammonium hydroxide;

(4) and cooling the residual gas to 24 ℃ by using water, and sequentially introducing a 2 mol/L hydrochloric acid solution, a 4 mol/L sulfuric acid solution and a methanol solution to obtain purified gas.

According to infrared spectrum and nuclear magnetic resonance spectrum analysis, the product obtained in the step (3) is tetramethylammonium hydroxide, and calculation shows that the removal rate of trimethylamine is 98% and the removal rate of methanol is 98% in the purified gas obtained in the step (4).

In summary, the treatment method for producing silicone oil waste gas provided by the invention uses waste gas to prepare tetramethylammonium hydroxide, uses the waste heat in the waste gas, reduces the energy loss in the tetramethylammonium hydroxide preparation process, realizes the cyclic utilization of the catalyst tetramethylammonium hydroxide, reduces waste, has high waste gas treatment efficiency, and has the removal rate of trimethylamine and methanol reaching more than 95%.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.