Production method of cis or trans-1, 3-dichloropropene

A technology of dichloropropene and a production method, which is applied in the directions of organic chemistry methods, chemical instruments and methods, halogenated hydrocarbon preparation, etc., can solve the problems of limiting reactor design, difficulty in industrialized production, etc., and achieves simple operation, simple equipment, low price effect

Active Publication Date: 2022-05-31
JIANGSU RUIHENG NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The uses of cis-1,3-dichloropropene and trans-1,3-dichloropropene are not the same, and their prices vary with demand. CN109694308A introduces the conversion of trans-1,3-dichloropropene into cis-1 , the method of 3-dichloropropene, CN111848334A discloses a kind of method that cis-1,3-dichloropropene is converted into trans-1,3-dichloropropene, but the above methods all need visible light or ultraviolet light Conditional response
The disadvantage of photocatalysis is that it generally needs ultraviolet light or visible light to irradiate the reactor, and the reactor needs to be able to transmit light or have a light source inside, which greatly limits the design of the reactor and is difficult to apply to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A production method of trans-1,3-dichloropropene, comprising the following steps:

[0028] S1: Mix the raw material cis-1,3-dichloropropene (content 98%) and the catalyst 3-bromopropene in a batching tank at a weight ratio of 1:0.3%;

[0029] S2: The mixed raw materials are continuously fed into a 500L tank reactor at a feed rate of 75L / h for reaction, the reaction temperature is 60°C, and the residence time of the reaction is 4h (calculated based on a feeding coefficient of 0.6);

[0030] S3: The reaction liquid is extracted into the rectification tower through the gas phase at the top of the tank reactor. The operating conditions of the rectification tower are that the temperature at the bottom of the tower is 82°C, the temperature at the top of the tower is 62°C, and the vacuum at the bottom of the tower is -0.065MPa. The vacuum at the top of the tower is -0.075MPa, and the heat is supplied by the reboiler, and the reflux ratio of the rectifying tower is 6:1;

[003...

Embodiment 2

[0033] A production method of trans-1,3-dichloropropene, comprising the following steps:

[0034] S1: Mix the raw material cis-1,3-dichloropropene (content 98%) and the catalyst 1-bromo-1,5-hexadiene in a batching tank at a weight ratio of 1:0.6%;

[0035] S2: The mixed raw materials are continuously fed into a 500L tank reactor at a feed rate of 100L / h for reaction, the reaction temperature is 65°C, and the residence time of the reaction is 3h (calculated based on a feeding coefficient of 0.6);

[0036] S3: The reaction liquid is extracted into the rectification tower through the gas phase at the top of the tank reactor. The operating conditions of the rectification tower are that the temperature at the bottom of the tower is 82°C, the temperature at the top of the tower is 62°C, and the vacuum at the bottom of the tower is -0.065MPa. The vacuum at the top of the tower is -0.075MPa, and the heat is supplied by the reboiler, and the reflux ratio of the rectifying tower is 4:1;...

Embodiment 3

[0039] A production method of trans-1,3-dichloropropene, comprising the following steps:

[0040] S1: The mixture of raw material cis-1,3-dichloropropene (content 98%) and catalyst 1-bromo-1,5-hexadiene, 1-bromohexene in a weight ratio of 1:1.5 in the batching tank % ratio mixing;

[0041] S2: The mixed raw materials are continuously fed into a 500L tank reactor at a feed rate of 150L / h for reaction, the reaction temperature is 80°C, and the residence time of the reaction is 2h (calculated based on a feeding coefficient of 0.6);

[0042] S3: The reaction liquid is extracted into the rectification tower through the gas phase at the top of the tank reactor. The operating conditions of the rectification tower are that the temperature at the bottom of the tower is 82°C, the temperature at the top of the tower is 62°C, and the vacuum at the bottom of the tower is -0.065MPa. The vacuum at the top of the tower is -0.075MPa, and the heat is supplied by the reboiler, and the reflux ra...

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PUM

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Abstract

The invention provides a production method of cis or trans-1, 3-dichloropropene, mutual conversion of cis or trans-1, 3-dichloropropene can be carried out under the condition that visible light or ultraviolet light is not needed by using a catalyst, the conversion direction can be freely selected according to actual requirements, the equipment is simple, the cost is low, and the production method is suitable for industrial production. According to the technical scheme of the invention, the catalyst is simple in preparation process and free of special design, the same set of equipment can be used for preparing trans-1, 3-dichloropropene from cis-1, 3-dichloropropene and can also be reversely operated, only corresponding products need to be controlled to enter the product tank and the raw material tank by using pipelines, and the catalyst in the technical scheme of the invention is low in price and easy to obtain, and can be used for preparing trans-1, 3-dichloropropene from cis-1, 3-dichloropropene. Various catalysts can be mixed without affecting the catalytic effect and can be obtained by recycling waste materials, the reactor does not need illumination, can be freely designed and can adapt to the large-scale production requirement, the gas phase of the reactor enters the rectifying tower through flash evaporation, continuous production can be achieved, and operation is easy and convenient.

Description

technical field [0001] The invention relates to the production field of chemical intermediates, in particular to a production method of trans or cis-1,3-dichloropropene. Background technique [0002] 1,3-dichloropropene is a by-product in the production of epichlorohydrin, which contains cis-1,3-dichloropropene and trans-1,3-dichloropropene in the form of isomer mixture, CN110078584A discloses A process for recovering dichloropropane and dichloropropene from the DD mixture, the method removes carbon and tar from the DD mixture in a weight-removing tower, and pre-separates dichloropropane and dichloropropene in a pre-fractionating tower, High-purity 1,2-dichloropropane is separated in the low boiling removal tower and 1,2-dichloropropane refining tower, and high-purity cis- and trans-dichloropropene are separated in the recovery tower. This method reaches To achieve the purpose of separating dichloropropane and dichloropropene. [0003] The uses of cis-1,3-dichloropropene a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/073C07C17/358C07C17/383
CPCC07C17/358C07C17/383C07B2200/09C07C21/073Y02P20/10
Inventor 田宇史雪芳盛俊马勇沈杰宋佳胡凯滕彦虎杨震宇吴宝健
Owner JIANGSU RUIHENG NEW MATERIAL TECH CO LTD
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