Catalyst for synthesizing 2,3,3,3-tetrafluoropropene, preparation method and purpose thereof

A tetrafluoropropene and catalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy carbon deposition of catalysts, short catalyst life, and no industrialization prospects, etc., and achieve low cost , Long service life, reduce the effect of material circulation

Active Publication Date: 2016-12-07
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Catalyst for synthesizing 2,3,3,3-tetrafluoropropene, preparation method and purpose thereof
  • Catalyst for synthesizing 2,3,3,3-tetrafluoropropene, preparation method and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1)Cr / AlF 3 Catalyst preparation

[0031] Cr(NO 3 ) 3 .6H 2 O is dissolved in water according to the amount of 5wt% of Cr loading, and is made into 30ml aqueous solution, and 50 grams of particle size is 3mm, and the specific surface area is 300m 2 / g of spherical γ-Al 2 o 3 As a carrier, the above aqueous solution is impregnated on the carrier with equal volume, and the immersion time is 12h. After impregnation, dry at 100°C for 12h. The dried catalyst was filled into a 316L stainless steel tubular reactor with an inner diameter of 26mm and a length of 60mm, and was roasted with nitrogen at 400°C for 4h, then cooled to 320°C for 8h with nitrogen, and then passed at 320°C The volume percentage of anhydrous hydrogen fluoride (AHF) is 1% mixed gas of anhydrous hydrogen fluoride and nitrogen (AHF / N 2 ) for fluorination activation for 2 hours, and then at a temperature of 350°C, the volume percentage of AHF is 5% AHF / N 2 Fluorination activation for 8 hours, and fin...

Embodiment 2

[0035] (1)Cr-Ni / AlF 3 Catalyst preparation

[0036] Cr(NO 3 ) 3 .6H 2 O and Ni(NO 3 ) 2 .6H 2O is dissolved in water according to the molar ratio of 2:1, and the total load of Cr-Ni is 5wt%. It is prepared 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-mentioned aqueous solution is impregnated on the carrier with equal volume, and the immersion time is 6h. After impregnation, dry at 120°C for 20h. The dried catalyst was filled into a 316L stainless steel tubular reactor with an inner diameter of 26mm and a length of 60mm, and was first roasted with nitrogen at 350°C for 6h, then lowered to 300°C for 10h with nitrogen, and then passed through at 300°C The volume percentage of anhydrous hydrogen fluoride (AHF) is 2% mixed gas of anhydrous hydrogen fluoride and nitrogen (AHF / N 2 ) for fluorination activation for 1 hour, and then feed AHF / N with a volume p...

Embodiment 3

[0040] (1)Cr-Ni / AlF 3 Catalyst preparation

[0041] Cr(NO 3 ) 3 .6H 2 O and Ni(NO 3 ) 2 .6H 2 O is dissolved in water according to the molar ratio of 2:1, and the amount of Cr-Ni total load 5wt% is prepared into a 30ml aqueous solution, and 50 grams of the 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 aqueous solution is impregnated on the carrier with equal volume, and the immersion time is 24h. After impregnation, dry at 150°C for 10h. The dried catalyst was filled into a 316L stainless steel tubular reactor with an inner diameter of 26mm and a length of 60mm, and was roasted with nitrogen at 450°C for 2h, then lowered to 250°C for 5h with nitrogen, and then passed through at 250°C The volume percentage of anhydrous hydrogen fluoride (AHF) is 3% mixed gas of anhydrous hydrogen fluoride and nitrogen (AHF / N 2 ) for fluorination activation for 3 hours, and then at a temperature of 400°C, AHF / N with a ...

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Abstract

The invention discloses a catalyst for synthesizing 2,3,3,3-tetrafluoropropene, the catalyst comprises an active component and a carrier, the active component is a mixture of Cr or Cr and Ni, the carrier is active gama-Al2O3 or coconut shell activated carbon, and the load capacity of the active component is 0.5-5 wt%. The invention also discloses a preparation method and a purpose of the catalyst, under the effect of the catalyst, bromomethane and tetrafluoroethene are taken as the raw materials to prepare the 2,3,3,3-tetrafluoropropene, the target products selectivity 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 catalyst for synthesizing 2,3,3,3-tetrafluoropropene, its preparation method and application. 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: tetrafluoro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J27/138C07C17/269C07C21/18
CPCB01J27/132B01J27/138B01J37/0201B01J37/08B01J37/26C07C17/269C07C21/18
Inventor 李宏峰王树华徐晓波黄雪浩马利勇
Owner JUHUA GROUP TECH CENT
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