Synthesis rectifying method and equipment of methane chloride

Abstract

The invention discloses a synthesis rectifying method and equipment of methane chloride and belongs to the field of chemical methane chloride and organic silicon. According to the technical scheme, the method includes the steps of firstly, feeding raw material methanol and hydrogen chloride into a reactor, performing bubbling reaction to obtain a mixture of methanol, dimethyl ether, methane chloride, hydrogen chloride and water, and feeding the mixture into a reaction rectifying tower for rectifying; secondly, feeding the mixture discharged from the top of the reaction rectifying tower in thefirst step into a washing tower for washing so as to absorb the hydrogen chloride; thirdly, feeding the gas-phase material obtained after the second step into an alkali washing tower reactor to removeall the hydrogen chloride so as to obtain a gas-phase material at the top of the alkali washing tower; fourthly, feeding the gas-phase material obtained after the third step into an extraction rectifying tower to obtain the methane chloride at the top of the extraction rectifying tower. The method is low in investment, low in energy consumption, little in three waste, high in yield, capable of eliminating the environment pollution of an original process and capable of recovering the high-additional-value product.

Description

technical field [0001] The invention relates to the field of chemical methane chloride and organic silicon, in particular to a method for synthetic rectification of monochloromethane and equipment thereof. Background technique [0002] Chloromethane is the main raw material for the production of organosilicon, and 50% to 90% of the world's monochloromethane is used for the production of organosilicon. There are two main methods for the production of chloromethane: liquid-phase catalytic method and gas-phase hydrochlorination method. At present, the liquid phase catalytic method is mainly used in China. In this method, gaseous methanol and hydrogen chloride are mixed into the reactor as raw materials, and the main reactions are as follows: [0003] CH 3 OH+HCL→CH 3 CL+H 2 o [0004] 2CH 3 OH→CH 3 OCH 3 +H 2 o [0005] The gas-liquid bubbling catalytic reaction is carried out under the action of a liquid catalyst. The gas phase coming out of the reactor is directly...

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Problems solved by technology

[0008] Therefore adopt the main problem of existing technology as follows: 1. contain raw material methanol in the waste water of reflux tank discharge, cause reactant to consume greatly; Biochemical bacteria; 3. Methanol is entrained to the downstream water washing tower, resulting in the production of hydrochloric acid COD exceeding the standard, which cannot be directly used and can only be processed by outsourcing; 4. Methanol is entrained to the downstream alkali washing tower, resulting in the production of alcohols with high salt and high COD Waste water cannot be used, and can only be incinerated by outsourcing; 5. The high value-added dimethyl ether cannot be effectively used, and it enters the sulfuric acid drying tower to produce carbon black, so the amount of waste acid is large; 6. Due to the loss and reaction of methanol A large amount of water in the reflux tank returns to the system, resulting in the problem of low reaction yield; 7. The water washing tower and the alkali washing tower are often blocked by silicon-based polymers, which increases the difficulty of equipment maintenance; 8. The existing dimethyl ether extraction process has high energy consumption , equipment investment is large, and the operation is unstable in the later stage

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