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Method and device for dehydrating and rectifying dichloromethane in production of acesulfame potassium

A technology of acesulfame potassium and dichloromethane, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, disproportionation separation/purification of halogenated hydrocarbons, etc., can solve problems that are difficult to meet industrial production, low purity of dichloromethane, Color deepening and other issues, to achieve the effect of high degree of automation, large processing capacity, and light color

Pending Publication Date: 2019-05-21
山东亚邦化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods all have the low purity of dichloromethane after treatment, and the color is deepened; the processing capacity is too small, and it is difficult to meet the needs of industrial production.

Method used

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  • Method and device for dehydrating and rectifying dichloromethane in production of acesulfame potassium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] 1. Open the discharge valve of the raw material storage tank, start the methylene chloride feed pump, feed the material into the dehydration tower to about 2 / 3 of the liquid level gauge at the bottom of the tower, and the feed flowmeter controls the opening of the feed valve.

[0032] 2. A temperature control instrument is installed at the bottom of the dehydration tower, and the bottom temperature is set to be controlled at 45-65°C. The signal of the temperature control instrument is sent to the opening of the steam inlet regulating valve of the reboiler at the bottom of the dehydration tower, and the inlet steam pressure is 0.05-0.2Mpa, so that The column is maintained at a constant temperature.

[0033]3. The dichloromethane and water at the bottom of the tower are vaporized and moved up to the top of the tower under the action of steam, and exchange heat with the top dichloromethane raw material. The mixed gas is cooled by the gas phase outlet at the top of the dehyd...

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PUM

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Abstract

The invention relates to a method and device for dehydrating and rectifying dichloromethane in the production of acesulfame potassium. The device comprises a crude dichloromethane product tank, a dehydration tower, an intermediate dichloromethane product tank, a rectifying tower, a residual liquid tank, a reflux tank and a finished product tank; the crude dichloromethane product tank, the dehydration tower, the intermediate dichloromethane product tank, the rectifying tower, the residual liquid tank and the reflux tank are sequentially communicated with the finished product tank. According tothe device for dehydrating and rectifying dichloromethane in the production of acesulfame potassium, recovered dichloromethane is high in purity, light in color and good in quality; the treatment capacity is large, and large-scale production can be achieved. The device has the advantages of being high in automation degree, capable of achieving DCS remote control and high in safety.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method and a device for dichloromethane dehydration rectification in the production of acesulfame potassium. Background technique [0002] Dichloromethane is a colorless, transparent, heavier than water, and volatile liquid. It is an excellent organic solvent. It is usually used as an organic phase reaction system in violent chemical reactions, or as an extraction agent based on the principle of similar compatibility. Extract the desired organic matter. Since dichloromethane is doped with some water or other organic matter after use, which affects its normal recycling, it must undergo dehydration, rectification and other processes to obtain qualified dichloromethane solvent. [0003] In the production of acesulfame potassium, there is 2% water in dichloromethane and a small amount of organic matter produced in the reaction process, so it must be refined t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C17/383C07C19/03
Inventor 张照明袁利明
Owner 山东亚邦化工科技有限公司
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