Method for separating and recycling chloromethane with chloromethane mixture gas

A technology for separation and recovery of mixed gases, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve problems that do not have industrialization conditions, are difficult to desorb, and are short, usually a few seconds to a few minutes. , to achieve good economic and environmental benefits

Inactive Publication Date: 2009-01-14
ZHEJIANG XINAN CHEM INDAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle period of pressure swing adsorption is generally very short, generally several seconds to several minutes. In such a short period of time, it is difficult for methyl chloride and other gases to penetrate the adsorbent in an orderly manner. Most of the methyl chl...

Method used

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  • Method for separating and recycling chloromethane with chloromethane mixture gas
  • Method for separating and recycling chloromethane with chloromethane mixture gas

Examples

Experimental program
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Effect test

Embodiment 1

[0037] After absorbing hydrogen chloride with 15%-30% sodium hydroxide lye, the mixed gas of chloromethane enters the inlet of the compressor through the buffer tank, pressurizes to a gauge pressure of 0.5MPa, cools to 5°C, and condenses to separate part of methanol and methylal After being mixed with water and other impurities, it enters a temperature swing adsorption system with two towers connected in series and two towers connected in parallel under normal pressure for temperature swing adsorption separation treatment, and the non-adsorbed methyl chloride gas is obtained from the outlet of the adsorption tower. One group of towers in the adsorption system operates at room temperature, and the other group of towers is regenerated with nitrogen purging at 150°C for recycling. The conversion of the adsorption tower device is automatically operated by computer control. The adsorbents loaded in the same way in the two groups of adsorption towers are color-changing silica gel an...

Embodiment 2

[0039] Carry out separation operation in the mode of embodiment 1, select activated carbon and 4A molecular sieve as adsorbent, the loading volume ratio is 1: 2.

Embodiment 3

[0041] The separation operation was carried out in the manner of Example 1, and the adsorbent was selected from color-changing silica gel and 5A molecular sieve, and the filling volume ratio was 1:2.

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Abstract

Disclosed is a method for separating a mixed gas of methyl chloride to recover methyl chloride, and the method at least has two absorption tower systems filled with adsorbents, and obtains the methyl chloride gas separated and removed of impurities from discharge ports of the absorption towers through temperature swing adsorption processes of both adsorption and desorption to the mixed gas containing methyl chloride in the absorption towers respectively by means of interlock of time sequence; the adsorbent is at least one of allochroic silicagel, active carbon, aluminum silicate salt zeolite molecular sieve or alumina zeolite molecular sieve; and the method adopts the dry separation and recovery of temperature swing adsorption, one set of apparatus can remove water, methanol, methylal, methyl oxide and air simultaneously, and the methyl chloride product is obtained relying on high purity and/or high rate of recovery, the flow is simple and operation costs are low; and the method can realize the zero discharge of waste sulfuric acid and waste desiccant and green and environment-friendly production compared with the traditional treatment method.

Description

technical field [0001] The invention relates to a method for separating and recovering methyl chloride from a mixed gas containing methyl chloride, more specifically from the production and purification of glyphosate acid, dimethyl phosphite, trimethyl phosphite, etc. In the exhaust gas, after removing impurities such as methanol, methylal, water, etc., it is a method for recovering methyl chloride with high efficiency and pollution-free, and the method does not produce secondary pollution. Background technique [0002] Glyphosate is the fastest-growing herbicide with the largest sales volume in the world. It has excellent herbicidal performance and less residue in the soil and has been widely used around the world, opening up prospects for the development of glyphosate. The production of glyphosate acid mainly contains two kinds of methods at present, and a kind of is IDA method, and it is the IDA method with diethanolamine generally adopted by companies such as U.S. Monsan...

Claims

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Application Information

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IPC IPC(8): C07C19/03C07C17/389
Inventor 王正宝佘慧玲刘春杰吴涛曹阳任不凡郑捷
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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