摘要:
PURPOSE: A manufacturing method of 1,1,1,2-tetrafluoroethane is provided to improve process cost, and process safety, because of using environment-friendly raw material of lost cost like tetrafluoroethane as a starting material, and not using hydrogen fluoride. CONSTITUTION: A manufacturing method of 1,1,1,2-tetrafluoroethane comprises: a step of generating 1,1,2,2-tetrafluoroethane by reacting tetrafluoroethane with gaseous hydrogen under the presence of a hydrogenation catalyst; and a step of obtaining 1,1,1,2-tetrafluoroethane through isomerization of the 1,1,1,2-tetrafluoroethane under the presence of a fluorination catalyst. The concentration of 1,1,2,2- tetrafluoroethane which is an intermediate product is 70 mol% or higher. The hydrogenation catalyst comprises one or more metal atoms selected from platinum group elements like platinum, palladium, rhodium, iridium, ruthenium, osmium, etc.
摘要:
본 발명에서는 헥사플루오로프로필렌(HFP)으로부터 1,2,3,3,3-펜타플루오로프로펜(HFO-1225ye)을 제조하는 방법을 제공한다. 1,2,3,3,3-펜타플루오로프로펜은 온난화 지수가 매우 낮으며 오존층 파괴능이 없는 냉매인 2,3,3,3-테트라플루오로프로펜(HFO-1234yf)의 중간생성물로서 HFP와 수소를 수소화 촉매 상에서 수소화 반응시켜 1,1,2,3,3,3-헥사플루오로프로판(HFC-236ea)을 생성하는 단계; 상기 HFC-236ea를 탈불화수소 촉매 상에서 탈불화수소 반응시켜 HFO-1225ye 제조하는 단계를 거쳐 제조한다. HFP를 수소와 기상에서 반응시켜 HFC-236ea를 제조할 때, 반응에 소비되는 수소만을 적절하게 투입함으로써 미반응 수소를 분리 및 순환시키는 공정을 없앨 수 있고, 과량의 수소에 의한 부반응을 억제시킨다. 수소화 반응에서 생성된 기체상태의 생성물(HFC-236ea)을 별도의 분리단계 없이 기상의 탈불화수소화 반응에 직접 투입하여 HFO-1225ye를 제조한다. 또한 본 발명에서는 HFP 수소화 반응의 반응열을 효율적으로 제거하고 반응온도를 제어하기 위해 HFC-236ea 탈불화수소화 반응에서 미반응한 HFC-236ea를 적정량 수소화 반응기로 순환시키는 방법을 사용한다.
摘要:
PURPOSE: A manufacturing method of chlorodifluoromethane is provided to increase the yield of chlorodifluoromethane, to production amount by using a reaction at high temperature and high pressure and to prevent the caulking phenomenon of a catalyst. CONSTITUTION: A manufacturing method of chlorodifluoromethane comprises: a step of removing oxygen from a reactor containing a metal support catalyst which Pd is supported by a porous catalyst support; a step of injecting a mixture which comprises hydrogen and liquefied chlorodifluoromethane into the reactor; and a step of obtaining a reactant with chlorodifluoromethane from a supercritical fluid phase with the inner temperature of 50-300 bar and the temperature of 300-500 deg. C by a hydrodechlorination reaction; a step of cooling the reactant; and a step of collecting difluoromethane from the reactant. [Reference numerals] (AA) Yield, conversion rate(%); (BB) HCFC-22 conversion rate; (CC) HFC-23 yield; (DD) HFC-32 yield; (EE) Methane yield; (FF) Reaction time(hr)