Liquid ring vacuum pump technology for producing organosilicone monomer

Abstract

The invention belongs to the field of producing organosilicone, and particularly relates to a liquid ring vacuum pump technology for producing organosilicone monomer. In the dimethyl hydrolyzed material splitting and annulus distillation process, the liquid ring vacuum pump is improved to improve the recycling utilization ratio of the material and avoid the system corrosion to reduce the faults of the vacuum pump. The technology takes the water ring vacuum pump as the main equipment, wherein the composition and temperature of the liquid ring medium of the liquid ring system are improved; the liquid ring medium is siloxane mixture comprising high boiling component of which the boiling point is higher than 210 DEG C and the content is lower than 50%, low boiling component of which the boiling point is lower than 135 DEG C and the content is lower than 40%, the rest of methylsiloxane mixture of which the boiling point is between 135 DEG C and 210 DEG C; most of the liquid ring medium is octamethylcyclotetrasiloxane. The temperature of the liquid ring medium is kept between 20 DEG C and 50 DEG C. By adopting the technology provided by the invention, the material recovery ratio is obviously increased; the waste water discharge amount is reduced; the vacuum pump does not break down; the normal running of production can be guaranteed.

Description

technical field [0001] The invention belongs to the field of organosilicon production, and in particular relates to a liquid ring vacuum pump process for the production of organosilicon monomers, especially in the process of cracking dimethyl hydrolyzed material and ring body distillation, improving the liquid ring vacuum pump to improve material recovery Utilization, reduce vacuum pump failure, and ensure the normal operation of the production line. Background technique [0002] At present, in the production process of organosilicon monomers, the conversion of dimethyl hydrolyzate into rings is usually realized under negative pressure conditions. In the production process of organic silicon monomer, the negative pressure system is generally realized by means of water ring vacuum pump or water ring vacuum pump + Roots pump. No matter which method is used, a water ring vacuum pump is required. However, limited by the existing process conditions, there are the following prob...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the production process, the vacuum system will bring the uncondensed material with slightly acidic gas into the water ring pump. The material contains about 400ppm of HCl, which dissolves and accumulates in the liquid ring system of the water ring pump and circulates to a certain level. After a period of time, the water in the liquid ring system will become more acidic, which will cause the entire liquid ring system to corrode, and leak points will appear, which will affect the operation of the vacuum pump.

[0004] 2. Due to the high melting point of the vaporized silicone ring product, the uncooled product entering the liquid ring system may crystallize and block the liquid ring system when it is lower than 64 ° C, so that the liquid ring pump is short of liquid, and the vacuum degree is reduced or Liquid ring pump failure

The material brought by the vacuum crystallizes when it encounters the water at a lower temperature in the water ring pump, and adheres to the pump casing and impeller, affecting the operation of the vacuum pump.

[0005] 3. In addition, in the production process, due to the long-term circulation, the materials brought by the vacuum system will be partially dissolved in the water of the water ring pump, or emulsified, and it is difficult to achieve separation by simple means

This part of the material is taken away from the production system with the renewal of the working fluid in the liquid ring system, resulting in waste

At the same time, this part of the material enters the wastewater system, increasing the treatment cost

[0006] 4. At the same time, during the production process of organic silicon monomer, the failure of the vacuum pump will lead to large vacuum fluctuations in the system. Due to the characteristics of the production process, the production load will be reduced, energy consumption will be increased, and the possibility of danger in the production line will be increased.