Process for producing high-purity methane chloride

Abstract

The invention provides a process for producing high-purity methane chloride. The process comprises the following steps of: introducing vaporized and overheated methanol and hydrogen chloride a reactor containing an alumina catalyst and reacting in the reactor to generate a mixture of methane chloride, methane, chloroethane and dichloromethane; introducing the generated mixture to a chilling device, carrying out chilling separation and then introducing into an acid-washing tower, an alkaline washing tower and a sulfuric acid drying system, compressing to prepare coarse methane chloride; leading the coarse methane chloride into a treating column and separating out heavy components from the bottom of the treating column; evaporating light-component methane and methane chloride to the top of the treating column together; then performing water cooling and deep freezing so that the methane chloride is liquefied, completely discharging the methane which is not liquefied into an exhaust washing tower by a deep freezer so as to separate methane chloride from methane and finally obtain high-purity methane chloride. In the invention, a single-tower rectification manner is adopted, therefore, equipment investment is not increased greatly, but also the content of methane chloride is increased to be higher than 99.98%.

Description

technical field [0001] The invention relates to a production process of methane chloride, in particular to a production method of high-purity monochloromethane. Background technique [0002] With the development of the organosilicon industry and the continuous development of downstream products of monochloromethane, the demand for commercial quantities of monochloromethane is increasing, but at this stage most of the production facilities for monochloromethane are only produced as supporting equipment, and the quality of monochloromethane Difficult to meet market requirements. At present, the synthesis of monochloromethane adopts gas-solid phase catalysis and liquid phase catalysis. In the production process of gas-solid catalysis, there are two production methods: [0003] One is that the crude monochloromethane that has undergone catalytic reaction is quenched, washed with water, washed with alkali, dried with sulfuric acid, and then compressed to obtain methyl chloride. ...

AI Technical Summary

Problems solved by technology

Although this method increases the content of monochloromethane, because there is no alkali washing process in the production process of the crude product of monochloromethane, the acidity in the crude product of monochloromethane is relatively high, and the requirements for the material of the rectifying tower are relatively high during rectification , and its disclosed rectification method is to remove the light components in the crude material of monochloromethane through the first rectification tower, and then remove the heavy components through the second rectification tower

The method of two-column distillation increases equipment investment and operating costs