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Nanometer fluorination catalyst for preparing R152a and preparation method of nanometer fluorination catalyst

A fluorination catalyst, nano technology, applied in the field of nano fluorination catalyst and its preparation, can solve the problem of high yield

Pending Publication Date: 2021-01-26
NORTH & SOUTH BROTHER PHARMACY INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the specific surface area of ​​the catalyst is 260m 2 / g or less, the pore volume is less than 0.4mL / g, and in the reaction of vinyl chloride and HF to generate 1,1-difluoroethane, the yield of R152a reaches only 73.7%.

Method used

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  • Nanometer fluorination catalyst for preparing R152a and preparation method of nanometer fluorination catalyst

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Embodiment 1

[0046] Add 0.1mol Cr(NO 3 ) 3 9H 2 O, 0.012mol Co(NO 3 ) 2 ·6H 2 O, 0.008mol Zn(NO 3 ) 2 ·6H 2 O and 0.030mol La(NO 3 ) 3 ·6H 2 O, and add 0.0008mol of PEG4000 and 0.0002mol of cetyltrimethylammonium bromide, stir and dissolve to obtain a mixed salt solution.

[0047] Add 100g of 0.5mol / L EDTA aqueous solution and 4.5g of 25% ammonia water dropwise while stirring at 40°C to form a gel, age at room temperature for 4 hours, filter to remove the clear liquid, wash with water twice, and spray dry. Set the inlet temperature to 200°C, the outlet temperature to 100°C, and the air flow to 5m 3 / h.

[0048] Calcining the spray-dried mixture at 550° C. for 2 hours to obtain a mixed nano-powder, adding 1% graphite, mixing evenly, and pressing into tablets to obtain a nano-fluorination catalyst precursor.

[0049] According to the transmission electron microscope photos, the crystal grain size of the obtained mixed nano powder is 25-40nm, with less agglomeration and good disp...

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Abstract

The invention relates to a nanometer fluorination catalyst for preparing R152a and a preparation method of the nanometer fluorination catalyst. Specifically, the invention relates to a nano-catalyst for catalytic preparation of R152a and a preparation method of the nano-catalyst. The precursor of the nanometer fluorination catalyst is prepared from a metal chromium salt, a metal cobalt salt, a metal zinc salt, a metal lanthanum salt, a complexing agent and a surfactant, wherein a molar ratio of the metal chromium salt to the metal cobalt salt to the metal zinc salt to the metal lanthanum saltis 1: (0.10-0.20): (0.05-0.18): (0.20-0.30); and the specific surface area of the nanometer fluorination catalyst is 465-500 m<2> / g, and the pore volume of the nanometer fluorination catalyst is 0.7-0.9 mL / g. The nanometer fluorination catalyst provided by the invention has higher catalytic activity and longer service life.

Description

technical field [0001] The present invention relates to a nano-fluorination catalyst for preparing R152a and its preparation method and application, in particular to a catalyst for the gas-phase fluorination reaction of halogenated hydrocarbons and hydrogen fluoride, especially nano-fluoride for catalytic preparation of R152a Catalysts and methods for their preparation. Background technique [0002] R152a (HFC-152a, F152a, molecular structure CH 3 -CHF 2 ) is an important fluorine-containing organic compound, with an ozone-destroying potential value of OPD=0 and a global warming coefficient value of GWP=0.03. R152a generally forms a mixed refrigerant with other refrigerants and is widely used in refrigeration systems. [0003] The synthesis routes of R152a mainly contain the following: (1) gas-phase fluorination with vinyl chloride as raw material; (2) liquid-phase fluorination with vinyl chloride as raw material; (3) gas-phase fluorination with acetylene as raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J35/02B01J35/10C07C17/35C07C19/08
CPCB01J27/132C07C17/35B01J35/40B01J35/635B01J35/615C07C19/08
Inventor 张雅倩
Owner NORTH & SOUTH BROTHER PHARMACY INVESTMENT CO LTD
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