Process for production of high purity isobutylene

An isobutene, high-purity technology, used in separation methods, chemical instruments and methods, purification/separation of hydrocarbons, etc.

Pending Publication Date: 2021-03-30
LUMMUS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this approach involves many unit operations and frequent catalyst replacement

Method used

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  • Process for production of high purity isobutylene
  • Process for production of high purity isobutylene

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Embodiment Construction

[0013] Embodiments herein relate to a method of producing high purity isobutene (HPIB) through a heat integrated catalytic distillation process.

[0014] The first step in the process involves a catalytic distillation process to separate a stream containing isobutene and isobutane from a stream containing mixed C4, which may contain 1-butene, 2-butene, isobutene, Butane, isobutene, butadiene and n-butane. Catalytic distillation combines distillation of 1-butene to 2-butene and linear hydroisomerization and allows complete separation of all heavier (higher boiling) C4 components from the overhead isobutane plus isobutene stream. This stream is then fed to the second step of the process, which includes a fractionation column to separate high purity (98.0-99.99% by weight) isobutene from isobutane.

[0015] The catalytic distillation process is carried out at elevated pressures much higher than atmospheric pressure as disclosed for example in US6242661 where "atmospheric" pressu...

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Abstract

Processes for the production of high purity isobutylene are disclosed. The processes may include supplying a mixed C4 feed stream to a catalytic distillation column, which may contain a butene isomerization catalyst. 1-butene is isomerized to 2-butene and concurrently in the catalytic distillation column the 2-butene is separated from the isobutane and isobutylene. The overheads fraction comprising the isobutane and isobutylene is then condensed in an overheads system and fed to a splitter, where the isobutane is separated from the isobutylene. The process further includes operating the catalytic distillation column at an overheads temperature greater than a bottoms temperature of the splitter, and heating a portion of the splitter bottoms stream via indirect heat exchange with at least aportion of the catalytic distillation column overheads fraction, thereby producing a heated bottoms stream (reboil vapor) fed to the splitter and a cooled overheads fraction.

Description

technical field [0001] Embodiments herein relate to the production of a high purity isobutene product from a mixed hydrocarbon stream containing isobutene, isobutane, and 1-butene. Background technique [0002] Isobutene is present in mixed hydrocarbon streams including saturated and unsaturated C4 hydrocarbon streams. Unfortunately, the boiling point difference between isobutene and 1-butene is too small to use distillation as an effective means for recovering high purity isobutene. [0003] One method for the production of high purity isobutene from mixed C4 fractions is via decracking of methyl tert-butyl ether (MTBE), as described in US7968758. The isobutene in the mixed butene stream can react with alcohols such as methanol to form MTBE. After separation from n-butenes, MTBE can be dissociated to form isobutene and methanol, allowing recovery of a high purity isobutene stream. However, this approach involves many unit operations and frequent catalyst replacement. ...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/09C07C11/09
CPCC07C5/2506C07C7/005C07C7/04C07C7/09B01D3/009B01D3/007B01D3/42Y02P20/10C07C11/08C07C11/09C07C9/12C07C7/20B01J2208/00176B01D3/4227B01J8/001
Inventor 马丁内斯·约翰内斯·阿尔梅林克里斯托弗·罗宾斯
Owner LUMMUS TECH INC
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