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Method for preparing isobutylene by dehydrogenizing iso-butane

A technology of isobutane and isobutene, which is applied in the field of isobutene preparation, can solve problems such as complex process flow and loss of raw material isobutane, and achieve the effects of simplifying process flow, reducing raw material loss, easy control and smooth operation

Active Publication Date: 2013-04-17
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of frequent burning and regeneration will not only lead to complicated process flow, but also cause the loss of raw material isobutane
And there are no other regeneration methods in the literature and patents.

Method used

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  • Method for preparing isobutylene by dehydrogenizing iso-butane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of solid Cr by a solid-state ion exchange 2 o 3 –CaO-K 2 O-Al 2 o 3 As a catalyst, at a reaction temperature of 530°C, a reaction pressure of 0.2MPa, and a reaction mass space velocity of 1.0h -1 Under the conditions, after the dehydrogenation reaction for 5 minutes, stop the reaction raw material isobutane feed under the same reaction conditions, feed hydrogen into the reactor at a rate of 10:1 by hydrogen volume space velocity, and carry out hydrogen reduction regeneration on the catalyst The ratio of the hydrogen reduction regeneration time to the reaction time is controlled at 1:1, that is, the hydrogen reduction is 5 minutes; after the hydrogen reduction regeneration is completed, the hydrogen feeding is stopped, and the raw material isobutane feeding is switched, and the cycle is repeated. The reaction product was collected with an air bag and analyzed by gas chromatography. The results are shown in Table 1.

Embodiment 2

[0017] Preparation of solid Cr by a solid-state ion exchange 2 o 3 –CaO-K 2 O-Al 2 o 3 As a catalyst, at a reaction temperature of 550°C, a reaction pressure of 0.1MPa, and a reaction mass space velocity of 1.0h -1 Under the conditions, after the dehydrogenation reaction for 10 minutes, stop the reaction raw material isobutane feed under the same reaction conditions, feed hydrogen into the reactor at the rate of hydrogen volume space velocity 100:1, and carry out hydrogen reduction regeneration of the catalyst The ratio of the hydrogen reduction regeneration time to the reaction time is controlled at 2:1, that is, the hydrogen reduction is 20 minutes; after the hydrogen reduction regeneration is completed, the hydrogen feed is stopped, and the raw material isobutane feed is switched, and the cycle is repeated. The reaction product was collected with an air bag and analyzed by gas chromatography. The results are shown in Table 1.

Embodiment 3

[0019] Preparation of solid Cr by a solid-state ion exchange 2 o 3 –CaO-K 2 O-Al 2 o 3 As a catalyst, at a reaction temperature of 580°C, a reaction pressure of 0.5MPa, and a reaction mass space velocity of 1.5h -1 Under the conditions, after the dehydrogenation reaction for 15 minutes, stop the reaction raw material isobutane feed under the same reaction conditions, feed hydrogen into the reactor at the rate of hydrogen volume space velocity 200:1, and regenerate the catalyst with hydrogen reduction The ratio of the hydrogen reduction regeneration time to the reaction time is controlled at 2:1, that is, the hydrogen reduction is 30 minutes; after the hydrogen reduction regeneration is completed, the hydrogen feed is stopped, and the raw material isobutane feed is switched, and the cycle is repeated. The reaction product was collected with an air bag and analyzed by gas chromatography. The results are shown in Table 1.

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Abstract

The invention provides a process method for preparing isobutylene by dehydrogenizing iso-butane. Particularly, solid Cr2O3-CaO-K2O-Al2O3 used as a catalyst is prepared by solid-state ion-exchange; after dehydrogenation reaction is performed for 5 to 30 minutes under the conditions of reaction temperature of 530 to 590 DEG C, reaction pressure of 0.1 to 0.5MPa, reaction quality space velocity of 1.0 to 1.5h<-1>, feeding of a reaction raw material (iso-butane) is stopped under the same reaction conditions, hydrogen is filled into a reactor according to hydrogen volume space velocity of 10 to 1,000h<-1> and the catalyst is subjected to hydrogen reduction regeneration; a ratio of hydrogen reduction regeneration time to reaction time is controlled according to a ratio of (1 to 3):1; and after hydrogen reduction regeneration is finished, feeding of the hydrogen is stopped, feeding of the hydrogen is switched into feeding of the raw material (iso-butane) and the operation is cycled and repeated. With adoption of the process method disclosed by the invention, online continuous reduction regeneration on the iso-butane dehydrogenization catalyst can be carried out, service life of the catalyst can be greatly prolonged, process flow is simplified, and energy consumption and material consumption of the reaction process are reduced.

Description

technical field [0001] The invention relates to the preparation of isobutene, in particular to a process for preparing isobutene by dehydrogenating isobutane to prolong the service life of a catalyst, simplify the reaction process flow and reduce the loss of isobutane as a raw material. Background technique [0002] Isobutene is a very important organic chemical intermediate, mainly used in the preparation of methyl tert-butyl ether (MTBE, high-octane clean gasoline blending component), butyl rubber, polyisobutylene, methacrylate, tert-butyl Various organic raw materials and fine chemicals such as phenol, tert-butylamine, 1,4-butanediol, ABS resin, etc. [0003] With the continuous development of isobutene downstream products and its derivatives, the demand for isobutene is increasing day by day. Due to the limitation of its own production technology, the conventional steam cracking process restricts the increase of isobutene production. In addition, with the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C5/333B01J23/92
CPCY02P20/584
Inventor 姚志龙毛进池刘皓刘文飞王若愚孙培永
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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