Isobutene preparation method

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

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 lo

Method used

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  • Isobutene preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A 100,000-ton / year isobutane dehydrogenation to isobutene plant (8,000 hours of operation per year), part of the isobutane dehydrogenation reaction to isobutene figure 1 Process technology. An alumina catalyst containing 0.77% Pt based on the catalyst weight percentage was used. The raw material isobutane, circulating hydrogen and steam 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 steam to isobutane is 4, and the inlet temperature of the first reactor is 618. ℃, the second reactor inlet temperature is 628℃, the first reaction outlet temperature is 520℃, the second reactor outlet temperature is 563℃, the reaction pressure is 0.1MPa, the isobutane weight space velocity is 4.0 hours -1 Under the above conditions, isobutene is produced in a two-stage two-stage fixed-bed reactor with interstage heat exchange. A heating furnace is arranged between the reactors to heat the outlet ...

Embodiment 2

[0031] A 100,000-ton / year isobutane dehydrogenation to isobutene plant (8,000 hours of operation per year), part of the isobutane dehydrogenation reaction to isobutene figure 1 Process technology. The molar ratio of isobutane to hydrogen is 2.5, the molar ratio of steam 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, and the outlet temperature of the first reaction is 520°C. The outlet temperature of the reactor was 563°C, and the other conditions were the same as in Example 1.

[0032] The single-pass conversion rate of the reaction is 50%, the selectivity of isobutylene is 89%, the reaction regeneration cycle is 84 hours, and the regeneration time is 8 hours.

[0033]

Embodiment 3

[0035] A 100,000-ton / year isobutane dehydrogenation to isobutene plant (8,000 hours of operation per year), part of the isobutane dehydrogenation reaction to isobutene figure 1 Process technology. The molar ratio of isobutane to hydrogen is 2.5, the molar ratio of steam to isobutane is 5, the inlet temperature of the first reactor is 613°C, the inlet temperature of the second reactor is 623°C, and the outlet temperature of the first reaction is 520°C. The outlet temperature of the reactor was 562°C, and the other conditions were the same as in Example 1.

[0036] The single-pass conversion rate of the reaction is 56%, the isobutylene selectivity is 92%, the reaction regeneration cycle is 120 hours, and the regeneration time is 8 hours.

[0037]

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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 by dehydrogenating isobutane. Background technique [0002] Isobutylene is an important chemical raw material, mainly used in the synthesis of methyl tert-butyl ether (MTBE), and can also be used to produce elastomers such as butyl rubber, isoprene rubber, and polyisoprene rubber. Production of various fine chemicals. The development and utilization of downstream products of isobutylene, especially the mass production of MTBE, has led to a sharp increase in the demand for isobutylene. The contradiction of the shortage of global isobutylene resources has become increasingly prominent. Expanding the source of isobutylene and increasing the output of isobutylene have become an important issue for global petrochemical development. [0003] Isobutane dehydrogenation is a competitive isobutene production process. The dehydrogenation of isobutane to isobutene is one of the important ways to increase the sour...

Claims

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Application Information

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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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