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A kind of dichloromethane cooling dehydration process

A dichloromethane and process technology, applied in the field of dichloromethane dehydration technology, can solve problems such as low energy consumption, dichloromethane cannot be used directly, and achieve the effects of simple process steps and good dehydration effect

Inactive Publication Date: 2019-02-05
南通康鑫药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has low energy consumption, convenient operation and good water removal effect, the dichloromethane obtained cannot be used directly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The following examples can enable those skilled in the art to understand the present invention more comprehensively, but the present invention is not limited to the scope of the described examples.

[0016] A dichloromethane cooling dehydration process, the dichloromethane cooling dehydration process steps are as follows:

[0017] (1) Prepare cooling chilled water to ensure normal power system;

[0018] (2) Open the coil chilled water outlet and inlet valves on the dichloromethane refrigeration receiving tank to ensure that the temperature of the chilled water is below -10°C. After freezing the dichloromethane to 0°C to -2°C with chilled water, adjust the freezing Water inlet and return valves, keep warm, let it stand for 3 hours, take samples for testing, and control the water content below 0.08%;

[0019] (3) After the test reaches the standard, immediately open the discharge valve under the methylene chloride refrigerated receiving tank, turn on the circulation pump...

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PUM

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Abstract

The invention discloses a dichloromethane temperature reduction dewatering process, which comprises the following steps of (1) preparing temperature reduction chilled water; enabling a power system to be normal; (2) using the chilled water to freeze dichloromethane to 0 DEG C to -2 DEG C; controlling the water content to be below 0.08 percent; (3) starting a circulation pump for feeding materials into a dichloromethane finished product buffer tank; (4) starting a dichloromethane dewatering pump; starting the circulation in a molecular sieve adsorption column until the water content is qualified; (3) performing barrel charging and inspection. The dichloromethane temperature reduction dewatering process has the advantages that the dichloromethane temperature reduction dewatering process uses the molecular sieve circulation starting; the water content of the dichloromethane can be reduced to be below 0.01 percent; the dewatering effect is good; the process steps are simple.

Description

technical field [0001] The invention relates to the technical field of dichloromethane dehydration process, in particular to a dichloromethane cooling dehydration process. Background technique [0002] When solvents are used, it is absolutely necessary to recover, refine and reuse solvents from various aspects such as solvent economic losses, environmental pollution, fire hazards, and damage to health. After the solvent is used once, it contains more impurities. Some impurities have no effect on the reuse of the solvent, but some impurities will bring great harm to some special chemical reactions, recrystallization, extraction, washing and other operations. adverse effects, at this time, impurities must be removed. The purpose of solvent recovery is to remove impurities that affect production, realize solvent reuse, reduce costs, and protect the environment. Solvent recovery methods include condensation, compression, absorption, adsorption and distillation. In general sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/38C07C17/389C07C19/03
CPCC07C17/38C07C17/389C07C19/03
Inventor 赵志炎徐正辉
Owner 南通康鑫药业有限公司