Process for purificaton and prodn. of diolefin hydrocarbon stream

Abstract

A selective acetylene hydrogenation process which is able to produce a high quality diolefin having extremely low levels of acetylene over an extended period of time compared with the prior art. The process of the present invention provides a selective hydrogenation reaction zone wherein the catalyst activity is maintained at a high level while the process unit remains on stream by contacting the selective hydrogenation catalyst with a polymer solvent, diolefin feed and hydrogen in one embodiment and by contacting the selective hydrogenation catalyst off-line with only polymer solvent and hydrogen in a second embodiment.

Description

Background of the invention [0001] The technical field to which this invention pertains is the purification of diene streams containing traces of acetylenic compounds. The production of dienes is well known and is largely practiced by utilizing by-products of various diene production processes (including naphtha cracking processes) and fluid catalytic cracking processes to produce various products and precursor products. Production of dienes. Most of these diene production processes produce undesired traces of acetylenic compounds. One method used to purify the diene stream is to selectively hydrogenate the acetylenic compound while minimizing the destruction or hydrogenation of the diene compound. [0002] The selective hydrogenation of acetylenic compounds is generally carried out in the presence of a selective hydrogenation catalyst and hydrogen at elevated pressure and temperature. Such selective hydrogenation catalysts are well known in the art and include, for example...

AI Technical Summary

Problems solved by technology

During the hydrogenation of acetylenic compounds, polymers are formed and deposited on the catalyst, thereby reducing the activity of the catalyst

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