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Manufacturing method of catalyst for pentafluoroethane

A technology of pentafluoroethane and catalyst, which is applied in the field of preparing the catalyst, and can solve the problem of low selectivity of HFC-125

Active Publication Date: 2007-03-28
FOOSUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] That is, when the starting material is PCE, the selectivity to HFC-125 is less than 20%

Method used

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  • Manufacturing method of catalyst for pentafluoroethane

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Embodiment 1

[0034] Fluorinated catalysts 1-5 were prepared according to the method shown in the steps of FIG. 1 . In Figure 1, catalyst 1 is composed of chromium oxide and magnesium oxide, catalyst 2 is composed of chromium oxide and iron oxide, catalyst 3 is composed of chromium oxide and molybdenum oxide, catalyst 4 is composed of chromium oxide and vanadium oxide, and catalyst 5 is composed of chromium oxide composed of alumina. Next, a catalyst composed of chromium oxide and magnesium oxide will be described.

[0035] In 1kg chromium(III) nitrate (Cr(NO 3 ) 3 9H2O) was dissolved in distilled water, and 0.391kg of ammonia (NH2O) was added dropwise 4 OH), so that blue-gray chromium hydroxide (Cr(OH) 3 )precipitation. The precipitate was washed well with hot distilled water, filtered and dried at 100°C for 24 hours to obtain solid chromium hydroxide. The chromium hydroxide thus obtained is ground into powder with a ball mill or a mortar, and then heat-treated. Heat treatment was p...

Embodiment 2

[0038] (Preparation of catalyst 2 (chromium oxide-iron oxide catalyst))

[0039] Catalyst 2 is prepared in the same manner as in Example 1, except that iron nitrate [Fe(NO 3 ) 2 ·6H 2 O] instead of magnesium nitrate.

Embodiment 3

[0041] (Preparation of catalyst 3 (chromium oxide-molybdenum oxide catalyst))

[0042] Catalyst 3 is prepared in the same manner as in Example 1, except that ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 ] instead of magnesium nitrate.

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Abstract

Preparing a chromium oxide catalyst for preparing pentafluoroethane using chloroethane comprises heating chromium hydroxide powder at greater than 300 DEG C. to give chromium oxide powder; heating a metal hydroxide selected from magnesium hydroxide, iron hydroxide, molybdenum hydroxide, vanadium hydroxide or aluminum hydroxide at 300 DEG C. or less to give a metal oxide powder e.g. magnesium oxide, iron oxide, molybdenum oxide, vanadium oxide or aluminum oxide; mixing the chromium oxide powder (85-99.5 wt.%) with the metallic oxide powder (0.5-15 wt.%); granulating the obtained mixture; calcining the granules at 200-300 DEG C. under nitrogen gas medium; and calcining the obtained granules at 300-320 DEG C. under a gas mixture comprising nitrogen and hydrogen fluoride (HF) and then at 320-380 DEG C. using HF gas. According to the invention, the fluorinating catalyst can be efficietly to prepare HFC-125 using chloroethane as a material and high yield is achieved.

Description

technical field [0001] The present invention generally relates to a catalyst for the preparation of pentafluoroethane and a method for its preparation. Specifically, the present invention relates to a kind of catalyst, it is applicable to by perchloroethane (C 2 Cl 4 , hereinafter referred to as "PCE") or 1,1-dichloro-2,2,2-trifluoroethane (CHCl 2 CF 3 , hereinafter referred to as "HCFC-123") reacts with HF to produce pentafluoroethane (CF 3 CHF 2 , hereinafter referred to as "HFC-125"), and relates to a method for preparing the catalyst. Background technique [0002] Typically, HFC-125 does not contain chlorine in its molecules, so its contribution to global warming and ozone depletion is minimal. HFC-125 is an alternative raw material for chlorofluorocarbons or hydrochlorofluorocarbons used as traditional refrigerants, blowing agents or propellants, and it is combined with difluoromethane (CH 2 f 2 , hereinafter referred to as "HFC-32") can be used as a raw materia...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J37/04B01J37/08C07C19/08C07C17/00
CPCB01J37/031B01J37/04B01J37/0009B01J23/28C07C17/206B01J37/26B01J23/26B01J23/862C07C19/08B01J23/24B01J23/86B01J23/88
Inventor 张香子金大铉金哲虎赵荣救李定殷金荣守饭久保祐一
Owner FOOSUNG
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