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Water removal method of dichloromethane

A technology of dichloromethane and water content, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problem of low energy consumption

Inactive Publication Date: 2015-08-26
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for removing water from dichloromethane in view of the deficiencies in the prior art, which has low energy consumption, convenient operation, good water removal effect and no secondary pollution.

Method used

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  • Water removal method of dichloromethane
  • Water removal method of dichloromethane

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: Carry out dichloromethane dehydration with PTFE membrane

[0023] Take a commercially available PTFE membrane with an average pore size of 0.5 μm, use a contact angle meter to measure the contact angle of water droplets on its surface is 120°, and the contact angle of dichloromethane is less than 5°, cover the PTFE membrane in a porous stainless steel tube to obtain a membrane assembly .

[0024] Take the dichloromethane with a water content of 7% recovered from the film production plant, and filter it with the membrane module equipped with the above-mentioned PTFE membrane. The pressure difference on both sides of the membrane module is 0.1MPa, and the parallel test is performed twice. During the filtration process, the dichloromethane permeated out of the outer wall of the membrane module is collected, and the water content of the permeated dichloromethane measured by a coulometric moisture content meter is less than 0.5%.

Embodiment 2

[0025] Embodiment 2: Carry out dichloromethane dehydration with porous carbon membrane

[0026] Take a commercially available porous carbon film with an average pore diameter of 8 μm, use a contact angle meter to measure the contact angle of water droplets on its surface to be 100°, and the contact angle of dichloromethane to be less than 5°, cover the porous carbon film in a porous stainless steel tube, Obtain the membrane assembly.

[0027] Take dichloromethane with 10% water content for extraction recovered from a pharmaceutical factory, and filter it with the membrane module equipped with the above-mentioned porous carbon membrane. The pressure difference on both sides of the membrane module is 0.1MPa, and the parallel test is performed twice. During the filtration process, the methylene chloride penetrating out of the outer wall of the membrane module is collected, and its water content is lower than 0.5% as measured by a coulometric moisture content analyzer.

Embodiment 3

[0028] Embodiment 3: Carry out dichloromethane dehydration with copper mesh

[0029] Using copper mesh with an average pore size of 18 μm as a support, octadecyltrichlorosilane was coated on the surface of the copper mesh to prepare a hydrophobic and lipophilic mesh. The surface water droplet contact angle measured by a contact angle measuring instrument is 130°, and the dichloromethane contact angle is less than 5°.

[0030] Get the methylene chloride containing 20% ​​water for cleaning recovered from the mechanical processing plant, and filter it with the above-mentioned hydrophobic and lipophilic mesh. The pressure difference on both sides of the membrane is 0.1 Mpa, and the parallel test is performed twice. The dichloromethane permeated through the hydrophobic and lipophilic omentum was collected during the filtration process, and its water content was measured by a coulometric moisture content analyzer to be less than 3%.

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Abstract

The invention relates to a water removal method of dichloromethane, which comprises the steps of filtering dichloromethane having a water content of 2-20% with a hydrophobic and oleophylic film having a pore size of 0.001-20 micrometers, collecting filtrate, and obtaining dichloromethane with a water content of less than 0.5%. The method is low in energy consumption, convenient to implement and good in water removal effect and cannot produce the problem of secondary pollution.

Description

technical field [0001] The invention relates to the field of chemical water removal, in particular to a method for removing water from dichloromethane. Background technique [0002] Dichloromethane is an important chemical raw material and solvent. Because of its strong solvency and low toxicity, it is widely used in chemical production, coatings, organic synthesis and other fields. When dichloromethane is used as a solvent or extractant, in order to save costs, it often needs to be recycled and used repeatedly. In the general solvent recovery process, water is the most abundant impurity. For example, in the organic synthesis process, the dichloromethane recovered from the mother liquor usually contains 2% to 20% water. Excessive water content will seriously affect the chemical reactions in organic synthesis, and even lead to the failure of organic synthesis. Therefore, the removal of water in dichloromethane is very necessary. [0003] The existing methods for removing wa...

Claims

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Application Information

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IPC IPC(8): B01D17/022C07C19/03C07C17/38
Inventor 高能文
Owner CHONGQING UNIV OF TECH
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