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Process and device for recycling methanol in production of methyl chloride

A technology of methanol recovery and methanol recovery tower, which is applied in the chemical industry, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve problems such as waste and environmental protection, and achieve the effects of small equipment investment, reduced production costs, and simple process flow

Inactive Publication Date: 2018-08-24
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Every time 1t of methyl chloride is synthesized, 0.75t of methanol-containing dilute hydrochloric acid is produced, and the dilute hydrochloric acid contains about 5% methanol, which causes waste and brings environmental problems

Method used

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  • Process and device for recycling methanol in production of methyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mass fraction of hydrogen chloride from the methyl chloride synthesis water washing tower is about 19%, the alcohol-containing dilute hydrochloric acid with a mass fraction of methanol of 5% is mixed with process water at a flow rate of 10t / h and 0.5t / h respectively, and then enters the preheater, and is recovered with methanol The hydrochloric acid is extracted from the bottom of the tower for heat exchange, and the alcohol-containing dilute hydrochloric acid is preheated to 90°C and enters the methanol recovery tower. 0.5MPa(G) steam is passed into the reboiler to provide heat to the methanol recovery tower, the temperature at the top of the methanol recovery tower is controlled at 105-110°C, and the pressure at the top of the methanol recovery tower is controlled at 0.2MPa(G). The gas phase at the top of the methanol recovery tower enters the partial condenser, and part of the gas phase condenses into the methanol reflux tank, and is sent back to the methanol reco...

Embodiment 2

[0019] Alcohol-containing dilute hydrochloric acid with a mass fraction of 23% hydrogen chloride and a mass fraction of methanol of 5.5% from the methyl chloride synthesis water washing tower is 12t / h, mixed with process water 2.82t / h, and enters the methanol preheater together, and is extracted with the bottom of the methanol recovery tower After heat exchange, the hydrochloric acid enters the methanol recovery tower at a temperature of 90°C. The reboiler of the methanol recovery tower is heated by 0.5MPa (G) steam, the temperature of the tower bottom is 142°C, and the pressure at the top of the tower is controlled to 0.2MPa by adjusting the discharge of non-condensable gas. The gas phase at the top of the methanol recovery tower enters the partial condenser, and the condensate enters the methanol reflux tank for reflux. The non-condensable gas is about 695kg / h superheated to 125°C and mixed with hydrogen chloride-methanol gas in the pipeline mixer to enter the synthesis react...

Embodiment 3

[0021] Alcohol-containing dilute hydrochloric acid with a mass fraction of 18% hydrogen chloride and a mass fraction of methanol of 5% from the methyl chloride synthesis water washing tower enters the methanol preheater 10t / h, and after heat exchange with the hydrochloric acid produced at the bottom of the methanol recovery tower, the temperature is 95°C and enters methanol recovery tower. The reboiler of the methanol recovery tower is heated by 0.5MPa (G) steam, the temperature of the tower bottom is 150°C, and the pressure at the top of the tower is controlled to 0.22MPa by adjusting the discharge of non-condensable gas. The gas phase at the top of the methanol recovery tower enters the partial condenser, and the condensate enters the methanol reflux tank for reflux, and the reflux ratio R=15. The methanol content in the non-condensable gas is about 94%, superheated to 125°C and mixed with hydrogen chloride-methanol gas in the pipeline mixer to enter the synthesis reactor fo...

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Abstract

The invention relates to a process for recycling methanol in production of methyl chloride. The process comprises the following steps: adjusting the concentration of diluted hydrochloric acid containing methanol with process water, and introducing the obtained diluted hydrochloric acid containing methanol into a methanol recovery tower; subjecting hydrochloric acid in the recovery tower to heat-exchanging, and carrying out pumping into a storage tank; cooling a tower-top gas phase material through a partial condenser, and allowing a condensate to return to a reflux tank for refluxing; and subjecting methanol non-condensable gas to overheating through a superheater, then mixing the overheated methanol non-condensable gas with mass flow of hydrogen chloride-methanol gas through a pipeline mixer, and allowing an obtained mixture to enter a methyl chloride synthesis kettle so as to synthesize the methyl chloride. The process provided by the invention has simple flow and low equipment investment, aims to save energy and reduce consumption, and reduces environmental pollution. According to the invention, through cyclic utilization of methanol, the production cost of the methyl chloride is reduced, and good economic benefits and environmental protection benefits are achieved.

Description

technical field [0001] The invention relates to a process and device for recycling methanol in the production of methyl chloride and belongs to the technical field of methyl chloride production. Background technique [0002] There are three main methods for industrial production of methyl chloride at home and abroad: homogeneous gas-phase reaction method, gas-solid catalytic reaction method and gas-liquid phase reaction method. Each production method has its advantages and disadvantages, and each has its own advantages and disadvantages. However, most of my country's production enterprises use the gas-liquid phase reaction method to produce methyl chloride. That is, a certain proportion of methanol and hydrogen chloride react under the action of the catalyst zinc chloride solution to generate methyl chloride, and after washing with water, alkali and pickling, go to the compressor to compress and cool to obtain liquid methyl chloride. The primary conversion rate of methanol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C29/80C07C31/04C07C17/16C07C19/03
CPCC07C17/16C07C29/76C07C29/80C07C31/04C07C19/03Y02P20/50
Inventor 高英刘奇英苗刚沈维云王斌
Owner HUBEI XINGFA CHEM GRP CO LTD
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