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Preparation method of Z-1,2,3,3,3-pentafluoropropylene

A technology of pentafluoropropene and hexafluoropropene is applied in the field of isomerization to obtain Z-1, which can solve the problems of low total yield and the like, and achieve the effect of high total yield

Active Publication Date: 2010-01-20
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This preparation method has the defect that the total yield is low

Method used

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  • Preparation method of Z-1,2,3,3,3-pentafluoropropylene

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preparation example Construction

[0037] Preparation of dehydrofluorination catalyst: For the preparation method of dehydrofluorination catalyst, refer to the method disclosed in Chinese patent CN100372607C.

[0038] Preparation of isomerization catalyst: Dissolve aluminum nitrate in water, add precipitant ammonia water at 60°C, control the pH of the solution between 5.5 and 6.5, make it fully precipitate under stirring conditions, filter the formed slurry, and use Wash with deionized water until neutral, then dry at 150°C for 12 hours to obtain Al(OH) 3 .

[0039] The obtained Al(OH) 3 Uniformly mixed with tin dioxide according to the required mass ratio, and pressed into tablets to obtain a catalyst precursor. The catalyst precursor was roasted in a muffle furnace at 400°C for 10 hours, then loaded into a tubular reactor, and heated to 300°C. Flow hydrogen fluoride gas for 2 hours, then raise the temperature to 350°C at a rate of 1°C / min, and continue fluorination for 10 hours to prepare an isomerization c...

Embodiment 1

[0041] 50 ml of a commercially available 2% Pd / C catalyst was added to a carbon steel pipe with an inner diameter of 38 mm. The temperature of the first reactor is 50°C, and H 2 and HFP, control H 2 The molar ratio to HFP is 2, and the space velocity of HFP is 360h -1 , reaction pressure 0.1MPa, after reacting for 20h, use gas chromatography to analyze the composition of organic matter in the reaction product, the results are shown in Table 1.

Embodiment 2

[0043] Add 50 ml of a commercially available 5% Pd / C catalyst into a glass tube with an inner diameter of 38 mm. The first reactor was placed in an ice bath at 0°C, and H 2 and HFP, control H 2 The molar ratio to HFP is 2, and the space velocity of HFP is 480h -1 , reaction pressure 0.1MPa, after reacting for 20h, use gas chromatography to analyze the composition of organic matter in the reaction product, the results are shown in Table 1.

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Abstract

The invention discloses a preparation method of Z-1,2,3,3,3-pentafluoropropylene (Z-HFO-1225ye), which comprises the following steps: a. adding hydrogen and hexafluoropropylene into a first reactor and reacting under the existence of a hydrogenation catalyst; b. leading a product prepared in the step a to flow into a first distillation tower for separation and returning a tower component to the first reactor; c. adding N2 and a tower reactor component 1,1,2,3,3-hexafluoropropane (HFC-263ea) prepared in the step b into a second reactor and reacting the 1,1,2,3,3-hexafluoropropane under the existence of dehydrofluorination catalyst; d. leading a product prepared in the step c to flow into a third reactor and reacting with E-HFO-1225ye under the existence of an isomerization catalyst; e. leading a product prepared in the step d to flow into a second distillation tower for separation and returning a tower component to the second reactor; f. adding a tower reactor component prepared in the step e into a third distillation tower and separating the tower component with a system to obtain the Z-HFO-1225ye after treatment; and g. adding a tower reactor component prepared in the step f into a phase separator for separation, returning an organic phase with rich HFC-236es to the second reactor and separating an organic phase with rich HF from the system. The invention is mainly used for the preparation of the Z-HFO-1225ye.

Description

technical field [0001] The present invention relates to a kind of preparation method of Z-1,2,3,3,3-pentafluoropropene (Z-HFO-1225ye), especially relates to a kind of raw material that takes hydrogen and hexafluoropropylene (HFP) Hydrogenation in the presence of a hydrogen catalyst, followed by dehydrofluorination and isomerization under the action of a dehydrofluorination isomerization catalyst to obtain Z-1,2,3,3,3-pentafluoropropene. Background technique [0002] Z-1,2,3,3,3-pentafluoropropene (Z-HFO-1225ye) and E-1,2,3,3,3-pentafluoropropene (E-HFO-1225ye), are 1,2 , Geometric isomers of 3,3,3-pentafluoropropene. Compared with the two, Z-HFO-1225ye has better refrigeration performance. When 1,2,3,3,3-pentafluoropropene (HFO-1225ye) is used as a refrigerant, the ratio of Z-HFO-1225ye to E-HFO-1225ye is required to be greater than 90%. [0003] "Preparation of E-1, 2, 3, 3, 3-pentafluoropropene, Z-1, 2, 3, 3, 3-pentafluoropropene and E-iodopentafluoropropene" Journal of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/25C07C17/358C07C17/383
Inventor 吕剑张呈平张伟郝志军何飞寇联岗王博庞国川
Owner XIAN MODERN CHEM RES INST
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