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Catalyst for 1,1-difluoroethane producing vapor process

A difluoroethane and catalyst technology, which is applied in the field of gas-phase production, can solve the problems of serious environmental pollution of the catalyst, short service life of the catalyst, deactivation of the catalyst, etc., and achieves easy activation and regeneration, good stability, and high space-time yield. Effect

Active Publication Date: 2007-03-21
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the environmental pollution of the tin-based catalyst is serious, the service life of the catalyst is short, and 1,1-difluoroethane is easy to polymerize during the preparation process, and oily substances are produced to cause catalyst deactivation.

Method used

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  • Catalyst for 1,1-difluoroethane producing vapor process

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment one: Catalyst composition: Cr: Co=1: 0.2 (the following examples are the molar ratio of each element)

[0024] Catalyst preparation process:

[0025] Accurately weigh 1 mol of chromium salt and 0.2 mol of cobalt salt (the salt can be nitrate, sulfate or chloride) which are easily soluble in water and dissolve in water, and the water is pure water. Then add alkaline solution (precipitating agent, which can be NaOH, KOH or NH 4 OH solution), keep PH=7-10. Filter, dry at 100°C, and bake at a low temperature in the range of 330°C to 380°C. Inert gas N was introduced during the roasting process 2 , The oxide catalyst can be prepared by extruding the calcined raw material. The components in the oxide catalyst mainly exist in the form of oxides.

[0026] After the oxide catalyst is prepared, take 100ml of the oxide catalyst and put it into a φ26*2.9 nickel tube, in the inert gas N 2 Under the protection of the hydrogen fluoride gas, the fluorination is carried...

Embodiment 2

[0029] Catalyst composition: Cr:Mg=1:0.1

[0030] Kong Rong

Embodiment 3

[0031] Example three: Cr: Co: Fe = 1: 0.2: 0.1

[0032] Kong Rong

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Abstract

The catalyst for preparing 1, 1-difluoroethane includes Cr element and one or two other metal elements of Co, Mn, Zn, Fe, Mg, Al and Ni in the molar ratio of 1 to 0.001-0.6, as well as F element and O element. The Cr base catalyst has less environmental pollution, high activity, high stability, long service life, no tendency of polymerizing 1, 1-difluoroethane, great contact area, fast reaction, high space time yield and easy regeneration. When the reaction is controlled in 150-200 deg.c, the reaction pressure has no influence on the variety of the reaction products, and the reaction products have less side products. The catalyst is prepared through a simple co-precipitation process.

Description

technical field [0001] The present invention relates to a catalyst for producing 1,1-difluoroethane by gas phase method. Background technique [0002] 1,1-Difluoroethane, the current international common name HFC-152a, is a widely used fluorine-containing organic compound, which can be used as a refrigerant and spray as a raw material for the production of fluoroplastics, especially its ozone-destroying The potential value (ODP) is 0, and the global warming potential value (GWP) is 0.02. As a substitute for CFC, it is attracting more and more attention. The conventional production method of 1,1-difluoroethane is to use vinyl chloride as a raw material for production, and it is also useful to use acetylene as a raw material for production. [0003] In the disclosed patent documents, the methods for producing with vinyl chloride as raw materials all adopt the liquid phase method for production. In the patent 97192750, the catalyst used in the production of difluoroethane by ...

Claims

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Application Information

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IPC IPC(8): B01J27/12B01J27/132C07C17/20C07C19/08
Inventor 于修源张武成李娜周志永
Owner SHANDONG DONGYUE CHEM
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