Patent ID: 9586876
Date: 2017-03-07
CPC Classifications: C07C

Claim:
1. A method for producing 2,3,3,3-tetrafluoropropene (1234yf) from 1,1,1,2,3-pentafluoropropane (245eb) comprising: (a) providing a stream containing at least about 50% by weight of 245eb and at least one impurity in an amount greater than 2% by weight, wherein said impurity is selected from 1,1,1,2,3,3-hexafluoropropane (236ea) and 1,2,3,3,3-pentafluoropropene (1225ye); (b) processing said steam provided in step (a) to produce at least one reactor feed stream by ensuring that said at least one reactor feed stream contains not more than 2% by weight of any one of the compounds 1,1,1,2,3,3-hexafluoropropane (236ea) and 1,2,3,3,3,-penatfluoropropene (1225ye), based on the total weight of 245eb in the reactor feed stream(s); and (c) feeding at least a portion of said feed stream to at least one dehydrofluorination reactor to produce a reaction product comprising relatively more 2,3,3,3-tetrafluoropropene compared to the amount of 2,3,3,3-tetrafluoropropene in said feed stream.