Method and device for continuously synthesizing pentachloroethane by taking trichloroethylene as raw material

A technology of trichlorethylene and pentachloroethane, which is applied in the field of microchannel continuous technology to synthesize pentachloroethane, can solve the problems of complex reaction equipment, low safety and controllability, and slow reaction rate, and achieve controllable reaction process , Improve the reaction efficiency, the effect of strong light transmittance

Pending Publication Date: 2022-05-10
SHENYANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction rate is slow, the reaction equipment used is complicated, and the safety and controllability are low.

Method used

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  • Method and device for continuously synthesizing pentachloroethane by taking trichloroethylene as raw material
  • Method and device for continuously synthesizing pentachloroethane by taking trichloroethylene as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] device such as figure 1 As shown, a device for continuously synthesizing pentachloroethane using dichloroethane as a raw material, the device includes a chlorine gas cylinder 1, a raw material tank 2, a metering pump 3, a preheating pipeline 4, a microchannel reactor 5, and a gas mass flow rate Meter 6, nitrogen cylinder 7, sampling valve 8, light source 9, time-delay pipeline 10, back pressure valve 11 and storage tank 12; Described microreactor 5 has two material inlets and a material outlet, and described Raw material tank 2 links to each other with a feed inlet of described microchannel reactor 5 by first pipeline; Described chlorine cylinder 1 links to each other with another feed inlet of described microchannel reactor 5 by second pipeline; The outlet of the microchannel reactor 5, the delay pipeline 10, the back pressure valve 11 and the storage tank 12 are connected in series through pipelines.

[0031] The first pipeline between the raw material tank 2 and the...

Embodiment 2

[0036] The configuration of the raw material liquid: use dry nitrogen to remove the dissolved oxygen in the raw material trichlorethylene and the solvent methylene chloride, then dissolve the trichlorethylene in the solvent, and then add the polymerization inhibitor (2,6-dichloromethane tert-butyl-p-cresol), promptly obtain raw material liquid, contain 0.1%wt polymerization inhibitor in the raw material liquid, and mass concentration is the trichlorethylene solution of 20%.

[0037] Then each material is passed into the device, first, use N 2 Purge the experimental device to eliminate water vapor and impurities in the reaction system. The raw material liquid prepared above is input into the raw material tank, and nitrogen protection is passed through the head space of the raw material tank at the same time, and is ready for use. Under ultraviolet light, open the gas valve of the chlorine gas cylinder, let the chlorine gas pass through the dryer to remove the residual trace mo...

Embodiment 3

[0039] The configuration of the raw material liquid: use dry nitrogen to remove the dissolved oxygen in the raw material trichlorethylene and the solvent methylene chloride, then dissolve the trichlorethylene in the solvent, and then add the polymerization inhibitor (2,6-dichloromethane tert-butyl-p-cresol), promptly obtain raw material liquid, contain 0.1%wt polymerization inhibitor in the raw material liquid, and mass concentration is the trichlorethylene solution of 20%.

[0040] Then feed each material into the device. First, use N2 to purge the experimental device to eliminate water vapor and impurities in the reaction system. The raw material liquid prepared above is input into the raw material tank, and nitrogen protection is passed through the head space of the raw material tank at the same time, and is ready for use. Under ultraviolet light, open the gas valve of the chlorine gas cylinder, let the chlorine gas pass through the chlorine gas drier, to remove the trace m...

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Abstract

The invention belongs to the technical field of chemical engineering, and relates to a method and a device for continuously synthesizing pentachloroethane by taking trichloroethylene as a raw material. The method comprises the following steps: firstly, introducing dried nitrogen into a microchannel reactor in the device; removing water from the chlorine gas through a mass flow controller and a dryer, and introducing the chlorine gas into a reactor system; the method comprises the following steps: introducing chlorine into a micro-channel reactor, pumping a raw material solution containing trichloroethylene into the micro-channel reactor, fully and uniformly mixing the raw material solution with the introduced chlorine in the micro-channel reactor in a gas-liquid two-phase manner, and continuously carrying out a continuous chlorination addition reaction on the mixed gas-liquid mixture in a delay pipeline under the action of illumination, and treating a liquid-phase product after the reaction to obtain high-yield pentachloroethane. According to the invention, a continuous process is adopted to replace a traditional intermittent mode to carry out a chlorination reaction to synthesize pentachloroethane, the mass transfer capacity of a gas-liquid reaction is enhanced, the reaction time is greatly shortened, the reaction efficiency is improved, and the defect of insufficient mixing of gas-phase and homogeneous-phase reactions is overcome.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a method for producing pentachloroethane, in particular to a method and a device for synthesizing pentachloroethane by using trichlorethylene as a raw material and using microchannel continuous technology. Background technique [0002] Traditional refrigerants are mostly chlorine-containing chlorinated alkanes (CF 2 Cl 2 、CHF 2 Cl, R502, etc.), chlorine-containing halogenated hydrocarbons in the atmosphere will decompose under the irradiation of ultraviolet rays to produce molecular chlorine, which has the problem of destroying the ozone layer. With the increasing awareness of environmental protection and survival in countries all over the world, the work of protecting the atmosphere and finding alternatives to ozone-depleting substances (ODS) has been gradually carried out. Chlorine-free hydrofluorocarbons have an ozone-depleting potential of 0, such as R125 refrigera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/12B01J19/00C07C17/02C07C19/043
CPCB01J19/0093B01J19/122C07C17/02C07C19/043
Inventor 贾志远鄢冬茂孙文瑄闫士杰魏微张建军刘嵩周川王珂
Owner SHENYANG RES INST OF CHEM IND
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