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A method for synthesizing 2,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and tetrafluoroethylene, which is applied in the field of synthesizing 2,3,3,3-tetrafluoropropene, can solve the problems of many types of by-products, easy carbon deposition of catalysts, and no industrialization prospects, etc. The effect of saving molding steps and reducing material circulation

Active Publication Date: 2018-12-21
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a catalyst is used, the reaction temperature required for the cracking of monochloromethane into carbene is still relatively high, so that tetrafluoroethylene also cracks at this temperature, resulting in more types of by-products, and catalytic thermal cracking reactions occur at higher temperatures, The catalyst is extremely prone to carbon deposition, resulting in a short catalyst life, and easy to block the pipeline, without industrialization prospects

Method used

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  • A method for synthesizing 2,3,3,3-tetrafluoropropene
  • A method for synthesizing 2,3,3,3-tetrafluoropropene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1)P 2 o 5 / γ-Al 2 o 3 Catalyst preparation

[0025] H 3 PO 4 According to the amount of P loading 2wt%, dissolve in water, make 30ml of aqueous solution, take 50 grams of particle size 3mm, specific surface area 300m 2 / g of spherical γ-Al 2 o 3 As a carrier, the above H 3 PO 4 The equal volume of the aqueous solution is impregnated on the carrier, and the impregnation time is 12h. After the impregnation is completed, dry at 100°C for 12h, and bake in air at 400°C for 4h. Prepare P with a P content of 2wt% 2 o 5 / γ-Al 2 o 3 catalyst. The calcined catalyst was filled into a 316L stainless steel tubular reactor with an inner diameter of 26 mm and a length of 60 mm.

[0026] (2) Preparation of 2,3,3,3-tetrafluoropropene

[0027] The catalyst is purged with nitrogen at room temperature for 12 hours to remove oxygen, stop the nitrogen, and introduce a mixed gas of bromomethane and tetrafluoroethylene. The molar flow ratio of bromomethane and tetrafluoroethy...

Embodiment 2

[0029] (1)P 2 o 5 / γ-Al 2 o 3 Catalyst preparation

[0030] Will (NH 3 ) 3 PO 4 According to the amount of P loading 5wt%, it is dissolved in water, and it is made into a 30ml aqueous solution, and 50 grams of the particle size is 1mm, and the specific surface area is 380m 2 / g of spherical γ-Al 2 o 3 As a carrier, the above (NH 3 ) 3 PO 4 The equal volume of the aqueous solution is impregnated on the carrier, and the impregnation time is 6h. After the impregnation is completed, dry at 120°C for 10h, and bake at 350°C for 6h in air. Prepare P with a P content of 5wt% 2 o 5 / γ-Al 2 o 3 catalyst. The calcined catalyst was filled into a 316L stainless steel tubular reactor with an inner diameter of 26 mm and a length of 60 mm.

[0031] (2) Preparation of 2,3,3,3-tetrafluoropropene

[0032]The catalyst is purged with nitrogen at room temperature for 12 hours to remove oxygen, stop the nitrogen, and pass in a mixed gas of bromomethane and tetrafluoroethylene. The...

Embodiment 3

[0034] (1)P 2 o 5 / γ-Al 2 o 3 Catalyst preparation

[0035] Will (NH 3 ) 2 HPO 4 According to the amount of 10wt% of P loading, it is dissolved in water, and it is made into 30ml aqueous solution, and 50 grams of particle size is 5mm, and the specific surface area is 320m 2 / g of spherical γ-Al 2 o 3 As a carrier, the above (NH 3 ) 2 HPO 4 The equal volume of the aqueous solution is impregnated on the carrier, and the impregnation time is 24h. After the impregnation is completed, dry at 150°C for 24h, and bake in air at 450°C for 2h. Prepare P with a P content of 10wt% 2 o 5 / γ-Al 2 o 3 catalyst. The calcined catalyst was filled into a 316L stainless steel tubular reactor with an inner diameter of 26 mm and a length of 60 mm.

[0036] (2) Preparation of 2,3,3,3-tetrafluoropropene

[0037] The catalyst is purged with nitrogen at room temperature for 12 hours to remove oxygen, stop the nitrogen, and introduce a mixed gas of bromomethane and tetrafluoroethylene...

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Abstract

The invention discloses a catalyst for synthesizing 2,3,3,3-tetrafluoropropene. The catalyst is modified gamma-Al2O3 doped with an element P or S, and the mass percentage of the element P or S is 1-10%. The invention also discloses a preparation method and an application of the catalyst. Under the action of the catalyst, methyl bromide and tetrafluoroethylene are used as raw materials to prepare the 2,3,3,3-tetrafluoropropene, the selectivity of a target product is good, and the yield is high.

Description

technical field [0001] The invention relates to the field of HFO-1234yf preparation, in particular to a method for synthesizing 2,3,3,3-tetrafluoropropene. Background technique [0002] 2,3,3,3-Tetrafluoropropene, the molecular formula is CF 3 CF=CH 2 , boiling point -28.3°C, CAS number: 754-12-1, its ODP is 0, GWP is 4, it has good life cycle climate performance, the atmospheric life is only 11 days; it has excellent physical and chemical properties, its molecular weight and HFC-134a Similar to HFC-134a, it has a lower boiling point and a higher saturated vapor pressure at room temperature, and has a similar density and critical point to HFC-134a, so it is considered to be a "direct substitute" for HFC-134a and has become the most potential No. One of the four generations of low-carbon refrigerants. [0003] According to literature and patents, the current synthesis routes of 2,3,3,3-tetrafluoropropene mainly include: tetrafluoroethylene method, trifluoropropyne method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/02
CPCB01J27/02B01J27/16B01J35/023B01J35/1019C07C17/269C07C21/18
Inventor 李宏峰王树华徐晓波黄雪浩马利勇
Owner JUHUA GROUP TECH CENT