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A kind of method of producing trans-1,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and product tower, which is applied in the field of preparation of hydrofluoroolefins, can solve the problems of low catalyst life, long process route, easy coking, etc., and achieve the effect of low catalyst cost, simple process and improved catalyst life

Active Publication Date: 2019-11-15
陕西延长石油集团氟硅化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the entire process route is relatively long. After the HF removal reaction is completed, it is necessary to separate E-HFO-1234ze, Z-HFO-1234ze, HFC-245fa and HF. After the completion, secondary separation is required, which consumes a lot of energy and costs. At the same time, Z-HFO-1234ze is an olefin, which is easy to coke during isomerization, resulting in a low catalyst life.

Method used

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  • A kind of method of producing trans-1,3,3,3-tetrafluoropropene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Catalytic reaction

[0031]HFC-245fa pump 1 is used to drive the material from the HFC-245fa storage tank 15 into the HFC-245fa preheater 4 during the initial feeding. The 245fa pump pumps the material into the HFC-245fa preheater 4, and uses the HF pump 2 to pump HF into the HF preheater 5 from the HF storage tank 3. The ratio of HF to HFC-245fa is 0.5:1, and HF and The preheating temperature of HFC-245fa is 150°C. The mixed material enters the gas mixer 6 after preheating, and enters the reactor 7 to react after being fully mixed. The reactor 7 is pre-loaded with chromium fluoride, and the reaction temperature is 250°C. The pressure is 0.1MPa, the residence time is 3s, and the reaction products mainly include HFC-245fa, HF, Z-HFO-1234ze, E-HFO-1234ze and a small amount of light components.

[0032] 2. Product separation

[0033] The reaction product enters the weight removal tower 8, the number of theoretical plates of the weight removal tower 8 is 20, the operat...

Embodiment 2

[0037] The difference from Example 1 is that in the catalytic reaction step 1, the molar ratio of HF to HFC-245fa is 5:1, the preheating temperature of HF and HFC-245fa is 200°C, and the reaction temperature is 300°C , the reaction pressure is 1MPa, and the residence time is 30s. In the product separation step 2, the theoretical plate number of the weight removal tower 8 is 25, and the reflux ratio is 4:1, and the theoretical plate number of the light removal tower 9 is 35, and the reflux ratio is 6:1, and the product tower 10 The number of theoretical plates is 35, the reflux ratio is 9:1, the theoretical plate number of the recovery tower 11 is 25, and the reflux ratio is 8:1. In the raw material recovery step 3, the circulation tower 12 has 25 theoretical plates and a reflux ratio of 4:1, and the HF column 13 has 25 theoretical plates and a reflux ratio of 3:1. The purity of E-HFO-1234ze detected by gas chromatography was 99.94%.

Embodiment 3

[0039] The difference from Example 1 is that in the catalytic reaction step 1, the molar ratio of HF to HFC-245fa is 10:1, the preheating temperature of HF and HFC-245fa is 230°C, and the reaction temperature is 380°C , the reaction pressure is 3MPa, and the residence time is 60s. In the product separation step 2, the theoretical plate number of the weight removal tower 8 is 30, and the reflux ratio is 8:1, and the theoretical plate number of the light removal tower 9 is 40, and the reflux ratio is 10:1, and the product tower 10 The theoretical plate number is 40, the reflux ratio is 20:1, the theoretical plate number of the recovery tower 11 is 30, and the reflux ratio is 10:1. In the raw material recovery step 3, the circulation tower 12 has 30 theoretical plates and a reflux ratio of 6:1, and the HF tower 13 has 30 theoretical plates and a reflux ratio of 5:1. The purity of E-HFO-1234ze detected by gas chromatography was 99.98%.

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Abstract

The invention provides a method for producing trans-1,3,3,3-tetrafluoropropene. According to the method, 1,1,1,3,3-pentafluoropropane is taken as a raw material, and hydrogen fluoride is taken as carrier gas; the 1,1,1,3,3-pentafluoropropane and the hydrogen fluoride are subjected to three steps of catalytic reaction, product separation and raw material recycling to synthesize the trans-1,3,3,3-tetrafluoropropene in one step. The method provided by the invention has the advantages of low catalyst cost, low energy consumption and simple process; meanwhile, the HF is introduced and is used for diluting the raw material, so that the possibility of carbon deposition of the catalyst is reduced, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to the field of preparation of hydrofluoroolefins, in particular to a preparation method for synthesizing trans-1,3,3,3-tetrafluoropropene by dehydrofluorination of 1,1,1,3,3-pentafluoropropane. Background technique [0002] 1,3,3,3-tetrafluoropropene (HFO-1234ze) is cis-1,3,3,3-tetrafluoropropene (Z-HFO-1234ze) and trans-1,3,3,3-tetrafluoropropene Generic term for fluoropropene (E-HFO-1234ze). Among them, E-HFO-1234ze is widely used as refrigerant, foaming agent, cleaning agent, organic solvent and heat transfer medium because it does not destroy the ozone layer and has low global warming potential. It is also used in the production of various fluorine-containing plastics and copolymers It is an important monomer and is an ideal substitute for some hydrofluoroalkanes recognized all over the world. [0003] The synthesis method of HFO-1234ze (Wang Bo et al., Industrial Catalysis, 2008,16,1, 1,1,1,3-tetrafluoropropene synthesis r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C17/383C07C21/18
CPCC07B2200/09C07C17/25C07C17/383C07C21/18
Inventor 魏效农王伟焦锋刚张伟聂剑飞白彦波李立曾纪珺马家琪吕剑武海涛高炜
Owner 陕西延长石油集团氟硅化工有限公司