Alcoholysis process of chloropropyltriethoxysilane

Abstract

The invention relates to an alcoholysis process of chloropropyltriethoxysilane, comprising the following steps: controlling the pressure of an ethanol evaporating pot within 0.1MPa, the liquid level of ethanol below 1 / 2 liquid level, the transfer pressure of the ethanol within 0.1MPa and the pressure of nitrogen gas input through a pneumatic film valve at 0.2-0.25MPa; opening an ethanol vapor inlet valve of an ethanol heating buffer tank and a conduction oil inlet valve, and controlling the oil temperature of a jacket at 165 DEG C and the temperature in the pot at 135 DEG C; starting up a falling film absorber recirculating cooling water hydrochloric acid storage pump, enabling the negative pressure to reach minus 0.03MPa and a system to keep a constant negative pressure state, opening a chloropropyltrichlorosilane storage and transfer valve, and adjusting and keeping the pressure of the nitrogen gas in the pot at 0.2-0.25MPa; opening an air inlet valve of an intake tower, and controlling the flow of an initial rotor flowmeter of an ethanol gas heating pot at 70m<3> / h, and the temperature on the top of the tower at 50 DEG C; opening a valve of a chloropropyltrichlorosilane feeding rotor flowmeter, adjusting the feed rate and the flow of gas ethanol and keeping the temperature on the top of the tower at 50 DEG C; opening the oil inlet valve in the reaction process, closing the oil inlet valve when the temperature of material is up to 175 DEG C, sampling from a sample connection for analysis, sucking the material into a product collecting pot at negative pressure after products are qualified, and cooling. The conversion rate of products is increased, the content of the products is increased, the production cost is reduced and the economic benefit is increased.

Description

technical field [0001] The invention relates to an alcoholysis process of chloropropyl triethoxysilane, in particular to an alcoholysis esterification process of γ-chloropropyl triethoxysilane. Background technique [0002] γ-Chloropropyltriethoxysilane is an important silane coupling agent and a key intermediate in the synthesis of other types of silane coupling agents. It is used to couple organic polymers and inorganic fillers to enhance their adhesion and improve The mechanical, electrical, water resistance and anti-aging properties of the product. It is often used in glass fiber, casting, textile additives, insulating materials and adhesives, etc., and has broad market prospects. [0003] The existing traditional alcoholysis and esterification processes of γ-chloropropyltriethoxysilane mainly include: (1) Alcoholysis and esterification of γ-chloropropyltrichlorosilane and absolute ethanol in an ordinary esterification kettle , the obtained crude product is neutralized...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: the reaction process is simple, but the reaction conditions are difficult to control, and the requirements for constant temperature and vacuum degree are relatively high. At the same time, the reaction cycle is long, the reaction is incomplete, and the energy consumption is high. Low, high impurity content in crude product

Although this method shortens the esterification reaction cycle and improves the conversion rate of raw materials, there are still difficult control of the reaction conditions. After the reaction of gamma-chloropropyl trichlorosilane and absolute ethanol in the esterification kettle, the crude product needs to be neutralized, Rectification system to get the product

Images