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The preparation method of isobutene

A technology of isobutene and isobutane, applied in chemical instruments and methods, chemical recovery, hydrocarbons, etc., can solve problems such as conversion rate, low selectivity, difficulty in large-scale process, easy deactivation of catalyst, etc., and achieve the goal of reaction process Easy, avoid frequent regeneration, easy to enlarge the effect

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is that the conversion rate and selectivity of the reaction process of isobutane dehydrogenation to isobutene are low in the prior art, the catalyst is easily deactivated, the regeneration cycle is short, and the process is difficult to enlarge. It provides a new The preparation method of isobutene

Method used

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  • The preparation method of isobutene

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Experimental program
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Effect test

Embodiment 1

[0026] A 100,000 tons / year isobutane dehydrogenation to isobutene plant (annual operating hours 8,000 hours), the isobutane dehydrogenation to isobutene reaction part uses figure 1 technology. An alumina catalyst containing 0.77% Pt by weight of the catalyst is used. The raw material isobutane, circulating hydrogen and water vapor are mixed and passed into the adiabatic fixed bed dehydrogenation reactor. The molar ratio of isobutane to hydrogen is 2.5, the molar ratio of water vapor to isobutane is 4, and the inlet temperature of the first reactor is 618 ℃, the inlet temperature of the second reactor is 628℃, the outlet temperature of the first reaction is 520℃, the outlet temperature of the second reactor is 563℃, the reaction pressure is 0.1MPa, and the weight space velocity of isobutane is 4.0 hours -1 Under certain conditions, isobutene is produced in two-stage fixed-bed reactors with interstage heat exchange. A heating furnace is arranged between the reactors to heat th...

Embodiment 2

[0029] A 100,000 tons / year isobutane dehydrogenation to isobutene plant (annual operating hours 8,000 hours), the isobutane dehydrogenation to isobutene reaction part uses figure 1 technology. The molar ratio of isobutane to hydrogen is 2.5, the molar ratio of water vapor to isobutane is 1.2, the inlet temperature of the first reactor is 645°C, the inlet temperature of the second reactor is 650°C, the outlet temperature of the first reaction is 520°C, and the temperature of the second reactor is 520°C. Reactor outlet temperature 563 ℃, other conditions are the same as embodiment 1.

[0030] The single reaction conversion rate is 50%, the isobutene selectivity is 89%, the reaction regeneration cycle is 84 hours, and the regeneration time is 8 hours.

Embodiment 3

[0032] A 100,000 tons / year isobutane dehydrogenation to isobutene plant (annual operating hours 8,000 hours), the isobutane dehydrogenation to isobutene reaction part uses figure 1 technology. The molar ratio of isobutane to hydrogen is 2.5, the molar ratio of water vapor to isobutane is 5, the inlet temperature of the first reactor is 613°C, the inlet temperature of the second reactor is 623°C, the outlet temperature of the first reaction is 520°C, and the temperature of the second reactor is 520°C. Reactor outlet temperature 562 ℃, other conditions are the same as embodiment 1.

[0033] The single reaction conversion rate is 56%, the isobutene selectivity is 92%, the reaction regeneration cycle is 120 hours, and the regeneration time is 8 hours.

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Abstract

The invention relates to an isobutene preparation method, wherein problems of low conversion rate, low selectivity, easy catalyst deactivation, short regeneration period, and difficult process scaling-up of the isobutene preparation reaction through isobutane dehydrogenation in the prior art are mainly solved with the present invention. The technical scheme comprises that: isobutane is adopted as a raw material, enters at least a heat insulation fixed bed reactor at a reaction temperature of 500-650 DEG C under a reaction pressure of 0-0.5 MPa at an isobutane weight space velocity of 2-6 h<-1> according to an isobutane / hydrogen molar ratio of 1.5-4:1 and a water vapor / isobutane molar ratio of 1-6:1, and contacts a Pt-containing alumina catalyst to produce the isobutylene. With the technical scheme, the problem in the prior art is well solved, and the preparation method can be used for industrial production of isobutene preparation through isobutane dehydrogenation.

Description

technical field [0001] The invention relates to a method for preparing isobutene from isobutane dehydrogenation. Background technique [0002] Isobutylene is an important chemical raw material, which is mainly used in the synthesis of methyl tert-butyl ether (MTBE), and can also be used in the production of butyl rubber, isoprene rubber, polyisoprene rubber and other elastomers, and can also be used in Production of various fine chemicals. The development and utilization of isobutene downstream products, especially the mass production of MTBE, has led to a sharp increase in the demand for isobutene. The contradiction of the global shortage of isobutene resources has become increasingly prominent. Expanding the source of isobutene and increasing the production of isobutene have become an important issue in the development of global petrochemicals. [0003] Isobutane dehydrogenation is a competitive isobutene production process route, and isobutane dehydrogenation to isobuten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/09C07C5/333
CPCY02P20/584
Inventor 张洪宇刘文杰张忠群
Owner CHINA PETROLEUM & CHEM CORP
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