Method for producing methane chloride through byproduct hydrogen chloride in production process of tetrachloroethylene

A production process, tetrachloroethylene technology, applied in chemical instruments and methods, organic chemistry, halogenated hydrocarbon preparation, etc., can solve problems such as the impact of monochloromethane production

Active Publication Date: 2015-01-28
SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the excess chlorine generated in the tetrachlorethylene generation process is not removed, but enters the monochloromethane production process with hydrogen chloride, and the excess chlorine will affect the monochloromethane production.

Method used

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  • Method for producing methane chloride through byproduct hydrogen chloride in production process of tetrachloroethylene

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Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1Shown, a kind of method utilizing the hydrogen chloride of by-product in the tetrachlorethylene production process to produce monochloromethane, the steps are as follows:

[0037] (1) After the mixed gas of the by-product hydrogen chloride and chlorine in the tetrachlorethylene production process is condensed to-18.9 ℃ through raw material condenser 1, introduce chlorine gas absorption tower 2, carbon tetrachloride is housed in chlorine gas absorption tower 2, pass through Carbon tetrachloride absorbs chlorine, and discharges thick hydrogen chloride gas at chlorine absorption tower 2 tower top; The tower bottom temperature-9.2 ℃ of chlorine absorption tower 2, tower top pressure 42kPa, tower top temperature-6.3 ℃; Described mixed gas and tetrachloride The mass ratio of carbonized carbon is 0.3:1.0;

[0038] The crude hydrogen chloride gas enters the hydrogen chloride condenser 5, condenses again at -10.2°C, and then enters the hydrogen chloride demister...

Embodiment 2

[0046] Utilize the method for the hydrogen chloride production monochloromethane of by-product in the perchlorethylene production process as described in embodiment 1, difference is:

[0047] In step (1), the temperature at the bottom of the chlorine absorption tower 2 is -10.1°C, the pressure at the top of the tower is 45kPa, and the temperature at the top of the tower is -6.9°C; the mass ratio of the mixed gas to carbon tetrachloride is 1.0:1.0;

[0048] In step (2), the compressed hydrogen chloride gas is superheated through the heater 9 to a temperature of 220° C., and then enters the reactor 11 together with the superheated methanol 10 having a temperature of 221° C., at 242° C. and 0.19 MPa, under the action of an alumina catalyst Response 5s.

[0049] The purity of the dichloromethane obtained in this embodiment reaches 99.94%, the methanol conversion rate is 99.1%, and the selectivity of the dichloromethane is 98.7%.

Embodiment 3

[0051] Utilize the method for the hydrogen chloride production monochloromethane of by-product in the perchlorethylene production process as described in embodiment 1, difference is:

[0052] In the step (1), the temperature at the bottom of the chlorine absorption tower 2 is -7.6°C, the pressure at the top of the tower is 47kPa, and the temperature at the top of the tower is -5.2°C; the mass ratio of the mixed gas to carbon tetrachloride is 0.6:1.0;

[0053] In step (2), the compressed hydrogen chloride gas is superheated through the heater 9 to a temperature of 230° C., and then enters the reactor 11 together with the superheated methanol 10 having a temperature of 225° C., at 270° C. and 0.19 MPa, under the action of an alumina catalyst Response 3s.

[0054] The purity of the monochloromethane obtained in this embodiment reaches 99.89%, the conversion rate of methanol is 98.9%, and the selectivity of monochloromethane is 98.1%.

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Abstract

The invention relates to a method for producing methane chloride through a byproduct hydrogen chloride in production process of tetrachloroethylene. The method comprises the steps of (1) condensing the mixed gas of excess chlorine and the byproduct hydrogen chloride in production process of tetrachloroethylene, then absorbing the chlorine by carbon tetrachloride between -5DEG C and -21DEG C, condensing again, eliminating the foam, buffering, and compressing; (2) heating up the hydrogen chloride and methyl alcohol, then reacting for 2-5 seconds under the action of a catalyst aluminum oxide so as to obtain the mixed product of methane chloride, methane, chloroethane and dichloromethane, and (3) chilling and separating the mixed product, sequentially water washing, alkali washing, drying by sulfuric acid and compressing the gas phase at 0.6-0.95MPa, condensing at 25-40DEG C, so as to prepare the methane chloride. According to the method, the chlorine is adsorbed by carbon tetrachloride, so that the chlorine is prevented from entering into a reaction system of the hydrogen chloride and methyl alcohol to affect the purity and selectivity of the reaction product methane chloride.

Description

technical field [0001] The invention relates to a method for producing monochloromethane, in particular to a method for producing monochloromethane by using hydrogen chloride by-produced in the production process of tetrachlorethylene, and belongs to the technical field of chemical industry. Background technique [0002] In the production process of tetrachlorethylene, it is accompanied by excessive chlorine and a large amount of hydrogen chloride by-product. Most domestic manufacturers use water or dilute hydrochloric acid to absorb hydrogen chloride to generate 31wt% hydrochloric acid, and then return the unabsorbed chlorine gas to the system after drying. This method of recovering chlorine consumes a lot of energy and produces a large amount of hydrochloric acid. At the same time, the moisture in the returned chlorine must be strictly controlled, which is likely to cause corrosion to the equipment. [0003] Chloromethane is widely used in industry, mainly used in the syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/03C07C17/16
Inventor 于海涛张晶群徐学军
Owner SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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