Process for selective removal of acetylenes from gaseous streams

摘要

The present discloses a process and catalyst therefor to selectively remove acetylenes from gaseous streams in the vapor phase. The process is particularly suitable for high yield recovery of olefinic hydrocarbons from gaseous streams in refinery processes.

主权项

1. A vapor phase process for selective removal of at least 80 mole % of acetylenic impurities from an input gaseous stream including one or more hydrocarbons, acetylenic impurities and steam, comprising:
contacting said input stream in the vapor phase at a temperature in the range of from 250° C. (480° F.) to 900° C. (1650° F.) with a solid catalyst comprising Ni, Fe, an alkali metal, and optionally an alkaline earth element wherein said Ni present in an amount of 0.25-20 wt % on a dry basis of said catalyst, Fe is present in an amount of 30-75% on a dry basis of said catalyst and recovering an output stream wherein said output stream lacks at least 80 mole % of said acetylenic impurities, wherein the input stream is selected from streams (a), (b), (c), (d) or (e):
wherein stream (a) comprises ethylene in at least 75 mol % based on the hydrocarbon, acetylenic impurities and steam content of the stream;wherein stream (b) comprises propylene in at least 75 mol % based on the hydrocarbon, acetylenic impurities and steam content of the stream;wherein input stream (c) comprises styrene in at least 75 mol % based on the hydrocarbon, acetylenic impurities and steam content of the stream;wherein stream (d) comprises isoprene in at least 75 mol % based on the hydrocarbon, acetylenic impurities and steam content of the stream; and wherein stream (e) comprises less than 50 mol % C4 hydrocarbons based on the hydrocarbon content of the input stream.