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Butadiene extraction process

A butadiene and butene technology, applied in the field of butadiene extraction, can solve the problems of lower yield, low overall yield, and loss of 1,3-butadiene

Active Publication Date: 2015-09-09
LUMMUS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First, the production of vinylcyclohexene (VCH, or butadiene dimer) increases with increasing temperature, with higher dimer production resulting in lower overall yields and possibly higher equipment fouli

Method used

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  • Butadiene extraction process

Examples

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Embodiment

[0048] According to the embodiments disclosed herein, with image 3 A similar butadiene recovery process is shown, with conventional butadiene recovery (utilizing screw-type or centrifugal compressors and cooling towers) and compressorless butadiene recovery (also involving cooling towers) utilizing the following conditions for comparison.

[0049] For the no-compressor design, the degassing tower is at 4.21kg / cm 2 Operate under the top pressure of the tower, slightly higher than the pressure of the extractive distillation system (main scrubber, rectifying column and post scrubber). Consequently, the degassing column operates at correspondingly higher temperatures: 148°C at the top and 193°C at the bottom.

[0050] For conventional methods, the degassing tower only has 0.7kg / cm 2 It operates at a higher overhead pressure and at much lower temperatures: 105°C top and 149°C bottom.

[0051] For this example, if image 3 The illustrated embodiment uses a straight-through co-...

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Abstract

A process for recovering 1,3-butadiene from a C4 fraction, where the butadiene extraction processes may be operated at an intermediate pressure using a liquid ring type compressor. The use of a liquid ring compressor, among other process options presented herein, may advantageously reduce capital and operating costs, similar to the compressorless option, while mitigating the risks associated with the higher operating temperatures and pressures associated with the compressorless option. Thus, the embodiments of the processes disclosed herein encompass the best features of the conventional design (low pressure, with a compressor) with the advantages of the compressorless design (low capital and operating cost), as well as other advantages unique to the systems disclosed herein.

Description

technical field [0001] Embodiments disclosed herein relate to the recovery of butadiene from mixed hydrocarbon streams. More specifically, embodiments disclosed herein relate to an improved butadiene extraction process wherein the degasser is operated at medium pressure. Background technique [0002] Butadiene is an important basic chemical and is used, for example, for the preparation of synthetic rubbers (butadiene homopolymer, styrene-butadiene-rubber or nitrile rubber) or for the preparation of thermoplastic terpolymers (acrylonitrile- butadiene-styrene copolymer). Butadiene is also converted to sulfolane, chloroprene and 1,4-hexamethylenediamine (via 1,4-dichlorobutene and adiponitrile). Dimerization of butadiene also allows the production of vinylcyclohexene, which can be dehydrogenated to form styrene. [0003] Butadiene can be produced from saturated hydrocarbons by refining processes or by thermal cracking (steam cracking) processes, in which case naphtha is usua...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C11/167B01J19/24
CPCC07C7/08C07C11/167B01D3/143B01D3/40B01D19/0068
Inventor 凯文·约翰·施温特罗伯特·J·布鲁默
Owner LUMMUS TECH INC
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