阅读说明：本技术 甲基氯硅烷水解乳化物处理方法 (Method for treating methyl chlorosilane hydrolytic emulsion ) 是由 吕磊 代田 余昌府 刘飞 余子舰 吴鹏程 刘少龙 于 2021-07-27 设计创作，主要内容包括：本发明涉及有机硅生产技术领域,是一种甲基氯硅烷水解乳化物处理方法,该方法包括以下步骤：甲基氯硅烷水解乳化物中加入无机盐溶液,搅拌并加热,待混合液冷却后静置分层,取上层液体进行下一步操作；将分层后的上层油相甲基氯硅烷水解乳化物通过膜分离处理,甲基氯硅烷水解乳化物中的甲基氯硅烷水解油与水进行分离。本发明提出了一种甲基氯硅烷水解乳化物处理方法,利用盐析加膜分离的方法对甲基氯硅烷水解乳化物处理,通过此方法,可以有效实现甲基氯硅烷水解乳化物的油水分离,且不会引入新的杂质,分离效率高,将甲基氯硅烷水解油回收再利用。(The invention relates to the technical field of organosilicon production, and discloses a method for treating a methylchlorosilane hydrolyzed emulsion, which comprises the following steps: adding an inorganic salt solution into the methyl chlorosilane hydrolyzed emulsion, stirring and heating, standing and layering after the mixed solution is cooled, and taking the upper-layer liquid for the next operation; and (3) carrying out membrane separation treatment on the layered upper oil phase methyl chlorosilane hydrolyzed emulsion, and separating methyl chlorosilane hydrolyzed oil from water in the methyl chlorosilane hydrolyzed emulsion. The invention provides a method for treating a methylchlorosilane hydrolyzed emulsion, which is used for treating the methylchlorosilane hydrolyzed emulsion by a salting-out and membrane separation method.)

1. A method for processing methyl chlorosilane hydrolysis emulsion is characterized by comprising the following steps:

the first step is as follows: adding 10-30 parts by weight of inorganic salt solution into every 100 parts by weight of methyl chlorosilane hydrolyzed emulsion, stirring and heating, standing and layering after the mixed solution is cooled, and taking the upper-layer liquid for next operation;

the second step is that: and (3) separating the layered upper oil phase methyl chlorosilane hydrolyzed emulsion from water through membrane separation treatment.

2. The method for processing the methylchlorosilane hydrolyzed emulsion according to claim 1, wherein the inorganic salt in the inorganic salt solution added in the first step of the method is one or more of sodium chloride, calcium chloride, magnesium chloride, calcium sulfate and magnesium sulfate.

3. The method for processing an emulsion hydrolyzed with methylchlorosilane as claimed in claim 2, wherein the concentration of the inorganic salt solution is 5 to 20%, the stirring temperature is 30 to 60 ℃, the stirring time is 20 to 30 minutes, and the standing time is 10 to 30 minutes.

4. The method for processing a methylchlorosilane hydrolyzed emulsion according to claim 1, 2 or 3, wherein the separation membrane used in the membrane separation in the second step of the method is a lipophilic or hydrophobic membrane.

5. The method for treating a methylchlorosilane hydrolyzed emulsion according to claim 4, wherein the lipophilic and hydrophobic membrane is a polytetrafluoroethylene microporous membrane or a polyvinylidene fluoride membrane.

6. The method for processing a methylchlorosilane hydrolyzed emulsion as claimed in claim 1, 2, 3 or 5, wherein the membrane separation device corresponding to the separation membrane in the second step of the method is a flat plate type, a roll type or a bag type.

7. The method for processing an emulsion hydrolyzed with methylchlorosilane as claimed in claim 4, wherein the membrane separation device corresponding to the separation membrane in the second step of the method is a flat plate type, a roll type or a bag type.

Technical Field

The invention relates to the technical field of organic silicon production, and discloses a method for treating a methylchlorosilane hydrolyzed emulsion.

Background

The organic silicon material has excellent high and low temperature resistance and electric insulation performance, and is widely applied to the fields of agriculture, industry, military and the like. The GE company of America invented the technology for synthesizing methyl chlorosilane by direct method in 1941, and the realization of the industrial production of the direct method in 1947 is a main mode for producing methyl chlorosilane by monomer enterprises at home and abroad at present.

The organic silicon products are various in types and complex in production process, and are prepared by starting from raw materials such as silicon powder, chloromethane and the like, synthesizing methyl chlorosilane monomers through catalytic reaction, preparing various types of polymers through a series of chemical reactions such as hydrolysis, cracking, polymerization and the like, and further processing the polymers into different types of products.

The hydrolysis process of methyl chlorosilane is the most important link in the production process of the organosilicon industry, and cyclic siloxane and linear siloxane which are hydrolysis products of methyl chlorosilane are important intermediates of a plurality of organosilicon products. At present, the hydrolysis process of methyl chlorosilane mainly comprises three hydrolysis processes of azeotropic acid hydrolysis, saturated acid hydrolysis and concentrated acid hydrolysis. In the methyl chlorosilane hydrolysis process, due to the collision of oil and water phases, an emulsification phenomenon exists in methyl chlorosilane hydrolysis oil, and a water-in-oil or oil-in-water emulsion is formed, so that the oil and the water phases are difficult to separate, the emulsified methyl chlorosilane hydrolysis oil in a production system can only be discharged out of the production system and is collected independently, the influence on a downstream working section is avoided, and the reuse rate of the collected methyl chlorosilane hydrolysis emulsion is low.

The emulsion breaking treatment of the emulsion is a basic method for realizing the separation of oil and water phases, and the emulsion breaking method can be divided into a physical mechanical method and a physical chemical method. The physical and mechanical methods include electro-sedimentation, filtration, ultrasound, etc., and the physical and chemical methods mainly change the interface property of the emulsion to break the emulsion, such as adding a demulsifier.

The physical or chemical method for treating the emulsion has the advantages and disadvantages, and the current membrane separation technology is used for oil-water separation in the petrochemical industry, and the main components of petroleum are the mixture of alkane, cyclane and aromatic hydrocarbon. The methyl chlorosilane hydrolysate (cyclic siloxane and linear siloxane) is mainly a substance consisting of-Si-O-Si-, and a substance containing a-Si-O-Si-structure and water are freshly separated by utilizing a membrane separation technology. The method of the invention widens the application field of the membrane technology, and provides a new method for oil-water separation in the organosilicon industry.

Disclosure of Invention

The invention provides a method for treating a methylchlorosilane hydrolyzed emulsion, which overcomes the defects of the prior art, can effectively solve the problem of methylchlorosilane hydrolyzed emulsion, realizes the oil-water separation of the methylchlorosilane hydrolyzed emulsion, and finally can recycle methylchlorosilane hydrolyzed oil.

The technical scheme of the invention is realized by the following measures: a method for processing a methylchlorosilane hydrolyzed emulsion comprises the following steps:

the first step is as follows: adding 10-30 parts by weight of inorganic salt solution into every 100 parts by weight of methyl chlorosilane hydrolyzed emulsion, stirring and heating, standing and layering after the mixed solution is cooled, and taking the upper-layer liquid for next operation;

the second step is that: and (3) separating the layered upper oil phase methyl chlorosilane hydrolyzed emulsion from water through membrane separation treatment.

The following is further optimization or/and improvement of the technical scheme of the invention:

the inorganic salt in the inorganic salt solution added in the first step of the method is one or more of sodium chloride, calcium chloride, magnesium chloride, calcium sulfate and magnesium sulfate.

The concentration of the inorganic salt solution is 5 to 20 percent, the stirring temperature is 30 to 60 ℃, the stirring time is 20 to 30 minutes, and the standing time is 10 to 30 minutes.

The separation membrane used in the membrane separation treatment in the second step of the method is an oleophylic hydrophobic membrane.

The oleophylic and hydrophobic membrane is a polytetrafluoroethylene microporous membrane or a polyvinylidene fluoride membrane.

The membrane separation device corresponding to the separation membrane in the second step of the method is a flat plate type, a roll type or a bag type.

The invention provides a method for treating a methylchlorosilane hydrolyzed emulsion, which is used for treating the methylchlorosilane hydrolyzed emulsion by a salting-out and membrane separation method.

Drawings

FIG. 1 is a flow chart of the process of the present invention.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are well known and commonly used in the prior art, unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the solution in the present invention is an aqueous solution of water as a solvent, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution, unless otherwise specified.

The invention is further described below with reference to the following examples:

example 1:

a method for processing methyl chlorosilane hydrolysis emulsion is characterized by comprising the following steps:

the first step is as follows: adding 10-30 parts by weight of inorganic salt solution into every 100 parts by weight of methyl chlorosilane hydrolyzed emulsion, stirring and heating, standing and layering after the mixed solution is cooled, and taking the upper-layer liquid for next operation;

the second step is that: and (3) separating the layered upper oil phase methyl chlorosilane hydrolyzed emulsion from water through membrane separation treatment.

Example 2:

as an optimization of example 1, the inorganic salt in the inorganic salt solution added in the first step of the above method is one or more of sodium chloride, calcium chloride, magnesium chloride, calcium sulfate and magnesium sulfate.

Example 3:

as optimization of the embodiment 1, the concentration of the inorganic salt solution is 5 to 20 percent, the stirring temperature is 30 to 60 ℃, the stirring time is 20 to 30 minutes, and the standing time is 10 to 30 minutes.

Example 4:

as an optimization of example 1, the separation membrane used in the membrane separation treatment in the second step of the above method is an oleophilic hydrophobic membrane.

Example 5:

as optimization of embodiment 1, the oleophylic and hydrophobic membrane is a polytetrafluoroethylene microporous membrane or a polyvinylidene fluoride membrane.

Example 6:

as an optimization of example 1, the membrane separation device corresponding to the separation membrane in the second step of the above method is a flat plate type, a roll type or a bag type. In the membrane separation treatment process, the membrane separation device for installing the separation membrane is the conventional membrane separation device.

Example 7:

as shown in figure 1, 100g of methyl chlorosilane hydrolyzed emulsion (viscosity of 100 mm) is taken²/s) in a 250ml beaker, 20g of 10% calcium chloride solution was added and stirred at 40 ℃ for 20min, after cooling, the mixture was left to stand for 10min, and the methylchlorosilane hydrolyzed emulsion was separated from the brine by means of a separatory funnel. Then, a polytetrafluoroethylene oleophylic hydrophobic membrane is utilized for processing, methyl chlorosilane hydrolysis oil penetrating through the membrane is collected, and the light transmittance of the methyl chlorosilane hydrolysis oil is measured.

Example 8:

as shown in figure 1, 100g of methyl chlorosilane hydrolyzed emulsion (viscosity 150 mm) is taken²/s) In a 250ml beaker, 20g of 10% calcium chloride solution was added and stirred at 40 ℃ for 20min, and after cooling, the mixture was allowed to stand for 10min, and the methylchlorosilane hydrolyzed emulsion was separated from the brine by a separatory funnel. Then, a polytetrafluoroethylene oleophylic hydrophobic membrane is utilized for processing, methyl chlorosilane hydrolysis oil penetrating through the membrane is collected, and the light transmittance of the methyl chlorosilane hydrolysis oil is measured.

Example 9:

as shown in figure 1, 100g of methyl chlorosilane hydrolyzed emulsion (viscosity 200 mm) is taken²/s) in a 250ml beaker, 20g of 10% calcium chloride solution was added and stirred at 40 ℃ for 20min, after cooling, the mixture was left to stand for 10min, and the methylchlorosilane hydrolyzed emulsion was separated from the brine by means of a separatory funnel. Then, a polytetrafluoroethylene oleophylic hydrophobic membrane is utilized for processing, methyl chlorosilane hydrolysis oil penetrating through the membrane is collected, and the light transmittance of the methyl chlorosilane hydrolysis oil is measured.

Example 10:

as shown in figure 1, 100g of methyl chlorosilane hydrolyzed emulsion (viscosity of 100 mm) is taken²/s) in a 250ml beaker, 20g of 10% calcium chloride solution was added and stirred at 50 ℃ for 30min, after cooling, the mixture was left to stand for 10min, and the methylchlorosilane hydrolyzed emulsion was separated from the brine by means of a separatory funnel. Then, a polytetrafluoroethylene oleophylic hydrophobic membrane is utilized for processing, methyl chlorosilane hydrolysis oil penetrating through the membrane is collected, and the light transmittance of the methyl chlorosilane hydrolysis oil is measured.

Example 11:

as shown in figure 1, 100g of methyl chlorosilane hydrolyzed emulsion (viscosity of 100 mm) is taken²/s) in a 250ml beaker, 20g of 10% calcium chloride solution was added and stirred at 50 ℃ for 30min, after cooling, the mixture was left to stand for 30min, and the methylchlorosilane hydrolyzed emulsion was separated from the brine by means of a separatory funnel. Then, a polytetrafluoroethylene oleophylic hydrophobic membrane is utilized for processing, methyl chlorosilane hydrolysis oil penetrating through the membrane is collected, and the light transmittance of the methyl chlorosilane hydrolysis oil is measured.

The results of measuring the light transmittance of the methylchlorosilane hydrolysis oil obtained in examples 7 to 11 are shown in table 1, and it can be seen from table 1 that the light transmittance of the methylchlorosilane hydrolysis oil treated by the method of the present invention is all above 94%, indicating that the oil-water separation effect is good.

In summary, the invention provides a method for treating a methylchlorosilane hydrolyzed emulsion, which utilizes a salting-out and membrane separation method to treat the methylchlorosilane hydrolyzed emulsion, and by the method, oil-water separation of the methylchlorosilane hydrolyzed emulsion can be effectively realized, no new impurities are introduced, the separation efficiency is high, and the methylchlorosilane hydrolyzed oil is recycled.

The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.