Method for preparing isobutylene by comprehensively using mixed C4

A technology for mixing C4 and isobutylene, which is applied to chemical instruments and methods, and the production of hydrocarbons and hydrocarbons from oxygen-containing organic compounds, can solve the problems of low added value of mixed C4 and low overall utilization efficiency of mixed C4, etc. To achieve the effect of increasing added value

Inactive Publication Date: 2011-05-25
王伟跃
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to produce isobutene by mixing C4, and the technical problem to be solved is that the overall utilization efficiency of C4 mixed by steam c

Method used

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  • Method for preparing isobutylene by comprehensively using mixed C4
  • Method for preparing isobutylene by comprehensively using mixed C4
  • Method for preparing isobutylene by comprehensively using mixed C4

Examples

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Embodiment 1

[0036] according to figure 1 As shown, the mixed carbon four composition (% by weight) from the steam cracking unit is: isobutane: 1, n-butane: 2, butadiene: 50, isobutene: 22, butene-1: 14, butene- 2:11. Butadiene selective hydrogenation catalyst is aluminum oxide supported metal nickel and zinc. The common raw material for catalytic distillation is hydrogen, and the hydroisomerization catalyst loaded in the reaction section is metal nickel and zinc supported on alumina. The etherification unit adopts a catalytic distillation reactor, and the catalyst is a macroporous strongly acidic cation exchange resin. Isobutane dehydrogenation uses a fluidized bed reactor, and the catalyst is platinum and zinc supported on alumina. The isomerization of butene-2 ​​to isobutene adopts a single-stage fixed-bed reactor, and the catalyst is a magnesium metal-modified zeolite molecular sieve. Experiments have proved that the yield of isobutene by the method of the present invention is 88% ...

Embodiment 2

[0038] according to figure 1Shown, the mixed carbon four composition (% by weight) from the steam cracking unit is: isobutane: 1, n-butane: 2, butadiene: 50, isobutene: 22, butene-1: 14, butene- 2:11. Butadiene selective hydrogenation catalyst is aluminum oxide supported metal palladium and zinc. The common raw material for catalytic distillation is hydrogen, and the hydroisomerization catalyst loaded in the reaction section is metal palladium and zinc supported on alumina. The etherification unit adopts a catalytic distillation reactor, and the catalyst is ZSM-5 molecular sieve. Isobutane dehydrogenation uses a fluidized bed reactor, and the catalyst is platinum and zinc supported on alumina. The isomerization of butene-2 ​​to isobutene adopts a fluidized bed reactor, and the catalyst is alkali metal modified SAPO-11 molecular sieve. Experiments show that the yield of isobutene of the present invention is 81%, n-butane is 5%, and the others are unconverted mixed carbon fo...

Embodiment 3

[0040] according to figure 1 As shown, the mixed carbon four composition (% by weight) from the catalytic cracking unit of the refinery is: isobutane: 34, n-butane: 10, butadiene: 0, isobutene: 15, butene-1: 13, butene En-2:28. No butadiene selective hydrogenation unit. The common raw material for catalytic distillation is hydrogen, and the hydroisomerization catalyst loaded in the reaction section is metal palladium and zinc supported on alumina. The etherification unit adopts a catalytic distillation reactor, and the catalyst is ZSM-5 molecular sieve. Isobutane dehydrogenation uses a fluidized bed reactor, and the catalyst is platinum and zinc supported on alumina. The isomerization of butene-2 ​​to isobutene adopts a single-stage fixed-bed reactor, and the catalyst is zeolite molecular sieve modified by magnesium alkali metal. Experiments show that the yield of isobutene of the present invention is 83%, that of n-butane is 3%, and that the others are unconverted mixed c...

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Abstract

The invention provides a method for preparing isobutylene by comprehensively using mixed C4 and mainly solves the problems of low overall utilization efficiency and low additional value of the mixed C4 byproduct of a refinery or a steam cracking device. An aim is fulfilled by adopting a technical scheme which comprises the following steps of: (1) selectively hydrogenating to remove butadiene in the mixed C4; (2) isomerizing butylenes-1 in the mixed C4 obtained in the first step into butylenes-2 by using catalytic distillation technology, and simultaneously dividing the mixed C4 into two strands of materials, namely the first material comprising isobutylene and iso-butane, and the second material comprising n-butane and butylenes-2; (3) separating the first material through an etherifying device to obtain high-purity isobutylene and high-concentration iso-butane; (4) dehydrogenating the iso-butane to obtain the high-purity isobutylene; and (5) isomerizing the butylenes-2 of the second material into the isobutylene by using isomerizing technology, and simultaneously separating to obtain higher-purity n-butane. The method can be applied to the industrial field of producing the high-purity isobutylene.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing mixed carbon four to prepare isobutene. Background technique [0002] Isobutene is one of the important basic organic raw materials. It is mainly used in the production of gasoline additives such as methyl tert-butyl ether (MTBE) and polyisobutene. Isobutene is also the main raw material for synthetic rubber such as butyl rubber. Raw materials for chemical raw materials such as tert-butanol, methacrylonitrile, antioxidants, etc. Isobutene is mainly derived from the by-product mixed carbon four of steam cracking unit and refinery catalytic cracking unit (FCC). At present, the most widely used method for separating isobutene from mixed carbon four is the etherification process. On the one hand, MTBE can be synthesized, and on the other hand, high-purity isobutene can be prepared by cracking MTBE. [0003] Mixed carbon four is one of the main by-products of steam cracking units and catalyti...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C9/10C07C1/20C07C5/327C07C5/27
CPCY02P20/10
Inventor 王伟跃
Owner 王伟跃
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