Method for improving stability of catalyst in recycling HFC-23
AssigneesZhejiang Research Institute of Chemical Industry Co., Ltd., Zhejiang Lantian Environmental Protection Hi-Tech Co., Ltd., Sinochem Lantian Co., Ltd.
InventorsWucan Liu, Jianjun Zhang, Wenfeng Han, Shucheng Wang, Feixiang Zhou
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Abstract
A method for improving the stability of a catalyst in recycling HFC-23 is provided. The recycling is realized by means of a fluorine-chlorine exchange reaction with HFC-23 and a halogenated hydrocarbon. The catalyst for the fluorine-chlorine exchange reaction comprises a main body catalyst and a metal oxide, wherein the metal oxide is selected from at least one metal oxide of K, Na, Fe, Co, Cu, Ni, Zn or Ti, and has an addition amount of 0.1-5 wt %. The method has advantages such as a good catalyst stability, a long life, and a low content of by-product CFC-12.
Claims8
A method for improving stability of a catalyst in recycling HFC-23 (CHF3, trifluoromethane, R23), the recycling is realized by means of a fluorine-chlorine exchange reaction with HFC-23 and a halogenated hydrocarbon, wherein the catalyst for the fluorine-chlorine exchange reaction comprises a main body catalyst and a metal oxide, and the metal oxide is selected from at least one metal oxide of K, Na, Fe, Co, Cu, Ni, Zn or Ti in an amount of 0.1-5 wt %,
- wherein the fluorine-chlorine exchange reaction comprises monochlorodifluoromethane (HCFC-22) and dischlorofluoromethane (HCFC-21), and
- wherein a selectivity of HCFC-22 in a process of fluorine-chlorine exchange reaction is monitored, and a decarbonization gas is introduced to maintain the selectivity of HCFC-22 at 50%-54% when the selectivity of HCFC-22 drops to 46%-48%.
Dependencies are inferred from the claim text.