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Method for preparing 1,1,1,2,3-pentafluoropropane

A technology of pentafluoropropane and pentafluoropropene, which is applied in the field of preparation of chemical products, can solve the problems of low reaction efficiency and high energy consumption, and achieve the effects of prolonging the operation cycle, life extension and stable performance

Inactive Publication Date: 2018-02-16
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method uses a large volume circulation method to control the reaction temperature, which has the disadvantages of high energy consumption and low reaction efficiency.

Method used

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  • Method for preparing 1,1,1,2,3-pentafluoropropane
  • Method for preparing 1,1,1,2,3-pentafluoropropane
  • Method for preparing 1,1,1,2,3-pentafluoropropane

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Use the tubular reactor 5 that is made of stainless steel, its inner diameter is 2.5cm, length is 150cm, built-in temperature jacket, external cooling jacket, fill 586g (being 400cm 3 ) of an inert filler and a hydrogenation catalyst mixture in a suitable proportion, the catalyst layer is dried with nitrogen and activated with hydrogen before the reaction, and then the hydrogenation reaction is carried out. After mixing hydrogen at 32mol / h and 1,1,1,2,3-pentafluoropropene at a feed rate of 4mol / h, it first enters the preheater 4 for preheating; then from the lower end of the heat exchange fixed bed reactor 5 (that is, the catalyst end with low active component content) enters, and the temperature of the mixed gas entering the reactor 5 is controlled to be 85-90°C, and the reaction pressure is 0.45-0.50MPa. During the continuous reaction of 1000 hours, the highest reaction temperature of the catalyst bed is 150~156℃, and the reaction temperature is stable. A conversion ...

Embodiment 2

[0044] Use the tubular reactor 5 that is made of stainless steel, its internal diameter is 2.5cm, length is 150cm, built-in temperature jacket, external cooling jacket, fill 586g (being 400cm 3 ) of an inert filler and a hydrogenation catalyst mixture in a suitable proportion, the catalyst layer is dried with nitrogen and activated with hydrogen before the reaction, and then the hydrogenation reaction is carried out. After mixing hydrogen at 20mol / h and 1,1,1,2,3-pentafluoropropene at a feed rate of 4mol / h, it first enters the preheater 4 for preheating; then from the lower end of the heat exchange fixed bed reactor 5 (that is, the catalyst end with low active component content) enters, and the temperature of the mixed gas entering the reactor 5 is controlled to be 75-80°C, and the reaction pressure is 0.45-0.50MPa. During the continuous reaction of 1000 hours, the highest reaction temperature of the catalyst bed is 165~169℃, and the reaction temperature is stable. A conversi...

Embodiment 3

[0046] Use the tubular reactor 5 that is made of stainless steel, its internal diameter is 2.5cm, length is 150cm, built-in temperature jacket, external cooling jacket, fill 586g (being 400cm 3 ) of an inert filler and a hydrogenation catalyst mixture in a suitable proportion, the catalyst layer is dried with nitrogen and activated with hydrogen before the reaction, and then the hydrogenation reaction is carried out. After mixing hydrogen at 6mol / h and 1,1,1,2,3-pentafluoropropene at a feed rate of 4mol / h, it first enters the preheater 4 for preheating; then from the lower end of the heat exchange fixed bed reactor 5 (that is, the catalyst end with low active component content) enters, the temperature of the mixed gas entering the reactor 5 is controlled to be 50-55°C, and the reaction pressure is 0.40-0.45MPa. During the continuous reaction of 1000 hours, the highest reaction temperature of the catalyst bed is 190~195℃, and the reaction temperature is stable. A 1,1,1,2,3-pen...

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Abstract

The invention discloses a method for preparing 1,1,1,2,3-pentafluoropropane by using 1,1,1,2,3-pentafluoropropene. The method relates to the following steps that (1) inert fillers and hydrogenation catalysts with different proportions are separately filled into a reactor from bottom to top, the raw material stream flow flows from bottom to top, the proportion of the inert fillers and the hydrogenation catalysts is kept to be gradually reduced along the direction of the material flow, and a heat-exchange fixed-bed reactor is filled in the way; (2) 1,1,1,2,3-pentafluoropropene is mixed and preheated with hydrogen gas, and the obtained mixture enters the heat-exchange fixed-bed reactor from the lower end of the heat-exchange type fixed-bed reactor, and a gas-phase catalytic hydrogenation reaction is performed at a temperature of 50-250 DEG C, and the generated 1,1,1,2,3-pentafluoropropane is discharged from the upper end of the heat-exchange fixed-bed reactor; and (3) heat exchange is performed on the heat generated by the reactor by using a cooling medium. The method has the advantages that the hydrogenation reaction speed and the temperature rise of the catalyst bed layer are bettercontrolled, the deactivation speed of the catalysts is slowed down, and the operation period of the catalysts is prolonged.

Description

technical field [0001] The invention belongs to the field of preparation of chemical products, and relates to a method for preparing 1,1,1,2,3-pentafluoropropane. Background technique [0002] 1,1,1,2,3-Pentafluoropropane (HFC-245eb) can be used as a refrigerant and as an intermediate for the preparation of fluoroolefins. HFO-1234yf, that is, 2,3,3,3-tetrafluoro-1-propene, has become the first choice of the fourth-generation refrigerant and has a good market prospect. 1,1,1,2,3-Pentafluoropropane can be used as a key intermediate for the preparation of HFO-1234yf. [0003] The literature by Knunyants et al., Journal of the USSR Academy of Sciences, Chemistry Department, "Reactions of fluoro-olefins", Report 1 3, "Catalytic hydrogenation of perfluoro-olefins", 1960 describes 1,2,3,3,3 - Hydrogenation of pentafluoropropene (HFO-1225ye) over a palladium catalyst supported on alumina to produce 1,1,1,2,3-pentafluoropropane (HFC-245eb) and 1,1,1,2 - Mixtures of tetrafluoroprop...

Claims

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Application Information

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IPC IPC(8): C07C17/354C07C19/08
CPCC07C17/354C07C19/08
Inventor 吴奕杨仲苗
Owner JUHUA GROUP TECH CENT
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