Process for purificaton and prodn. of diolefin hydrocarbon stream

A diene, stream technology, applied in raw material containing polymer solvent and has reduced polymerization, separation of butadiene feedstock stream to produce polymer solvent and has reduced polymerization field, can solve the problem of reducing catalyst activity And other issues

Inactive Publication Date: 2004-08-11
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the hydrogenation of acetylenic compounds, polymers are formed and

Method used

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  • Process for purificaton and prodn. of diolefin hydrocarbon stream

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In a prior art process for the purification of a butadiene stream, fresh feedstock having the characteristics and rates shown in Table 1 was mixed with 20,240 Kg / hr hexane solvent and 10.5 Kg / hr hydrogen and fed into a The selective hydrogenation zone of the selective hydrogenation catalyst. The effluent obtained from the selective hydrogenation zone, which also contains 10.1Kg / hr green oil (green oil) (generated in the selective hydrogenation zone), is fed to the solvent recovery column to generate butadiene whose composition and rate are shown in Table 2 The product stream, while recovering the hexane solvent containing the green oil, and recycling at least a portion of the solvent to the inlet of the selective hydrogenation zone. A small amount of light gas stream containing hydrogen, 1-butene and 1,3-butadiene was produced and recovered at a rate of 57 Kg / hr. A slipstream of recycled hexane solvent containing green oil at a rate of 1610Kg / hr (comprising 1575Kg / hr h...

Embodiment 2

[0028] The process described in Example 1 was repeated with the addition of a step in which the same recycled hexane solvent containing green oil was fed to the viscous stream fractionation zone to produce a 32 Kg of hexane containing 16.1 Kg / hr and 14.1 Kg / hr green oil / hr sticky stream. The remaining 1558.9 Kg / hr hexane was recovered as recycled hexane solvent. Therefore, only 16.1Kg / hr fresh hexane needs to be supplemented. The solvent was replenished at a rate of only 0.001% by weight butadiene feed.

[0029] Table 1 - Feedstock Composition and Rates

[0030] components Rate(Kg / hr)

[0031] Propylene 0.1

[0032] Propylene -

[0033] Propylene 1.0

[0034] 1-butene 81.0

[0035] 1,3-Butadiene 20150

[0036] Butyne 1.6

[0037] Vinyl acetylene 0.4

[0038] Green Oil 4.0

[0039] Residue 2.0

[0040] To...

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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...

Claims

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Application Information

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IPC IPC(8): B01J23/94B01J38/56C07C7/167
CPCB01J23/94C07C7/167C07C2523/72B01J38/56Y02P20/584C07C11/12
Inventor S·P·兰克顿
Owner UOP LLC
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