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Preparation method of 1-chloro-3, 3, 3-trifluoropropene

A technology of trifluoropropene and hydrogen fluoride, which can be applied in the fields of dehydrohalogenation preparation, halogen substitution preparation, sustainable manufacturing/processing, etc., and can solve the problems of low production efficiency, impact, low yield, etc.

Active Publication Date: 2020-10-30
ZHEJIANG SANMEI CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] During the preparation process of the gas phase method, the activity of the catalyst will gradually weaken, and after the catalyst is deactivated, the production efficiency of 1-chloro-3,3,3-trifluoropropene will be seriously affected, and when the catalyst is replaced, the reaction needs to be stopped. Replace the catalyst in the reactor, and the yield of this batch of 1-chloro-3,3,3-trifluoropropene is low due to catalyst deactivation, resulting in low production efficiency and increased post-processing costs

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  • Preparation method of 1-chloro-3, 3, 3-trifluoropropene

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Embodiment Construction

[0038] Such as Figure 1 to Figure 4 Shown, is the preparation method of a kind of 1-chloro-3,3,3-trifluoropropene of the present invention, it is characterized in that: comprise the following steps:

[0039] a. Reaction preparation:

[0040]The catalyst is placed on the catalyst rack 4, and then the catalyst rack 4 is gently put into the reactor 1 to prevent the catalyst from slipping off the catalyst rack 4; the preparation of the catalyst is convenient for increasing the reaction rate and improving the production efficiency.

[0041] b. Access to raw materials:

[0042] Feed nitrogen into reactor 1 and raise the temperature of reactor 1 to 300-320°C at the same time, then pass hydrogen fluoride into reactor 1 along with nitrogen, then raise the temperature of reactor 1 to 370°C and keep it for 1 hour, After that, the temperature was lowered to 250° C., and the vaporized 1,1,1,3,3-pentachloropropane was passed into the reactor 1. Raw materials are introduced to start the ...

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Abstract

The invention discloses a preparation method of 1-chloro-3, 3, 3-trifluoropropene, comprising the following steps of: a. reaction preparation; b, introducing raw materials; c, reacting; d, catalyst replacement; e, purifying; and f, tail gas treatment. The method comprises six steps in total. The catalyst is replaced in the reaction process of gas-phase hydrogen fluoride and 1, 1, 1, 3, 3-pentachloropropane in a reactor, the yield of the batch of products is not influenced, the reaction rate is increased, the production efficiency is improved, and the production cost is reduced. Meanwhile, a unique reactor is adopted for catalyst replacement, normal operation of the reaction is guaranteed, meanwhile, the operation of the reaction is not affected, the catalyst can be conveniently replaced, the replacement speed is increased, and the manufacturing cost is saved.

Description

technical field [0001] The invention belongs to the technical field of hydrochlorofluoroolefin production, and in particular relates to a preparation method of 1-chloro-3,3,3-trifluoropropene. Background technique [0002] 1-Chloro-3,3,3-trifluoropropene has a double bond in its structure and has a very short lifetime in the atmosphere. It is a promising alternative to environmentally friendly Freon that does not worry about the destruction of the ozone layer or global warming. As a next-generation compound Polyurethane foaming agent, working fluid, refrigerant, etc. The most common preparation route in the existing industry uses 1,1,1,3,3-pentachloropropane and anhydrous hydrogen fluoride as raw materials for production, and can also be produced from HCC-240fa or its derivatives such as 1,1,3,3- Co-production of tetrachloropropene and 1,3,3,3-tetrachloropropene. The production methods are divided into liquid-phase method and gas-phase method. The liquid-phase method gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/25C07C21/18C07C17/38
CPCC07C17/25C07C17/20C07C17/38C07C21/18C07C19/10Y02P20/584
Inventor 王晓东徐煜
Owner ZHEJIANG SANMEI CHEM IND