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Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof

A catalyst and isobutane technology, applied in the field of dehydrogenation technology, can solve the problems of unfavorable service life of the catalyst, complicated preparation steps of the catalyst, easy coke deactivation of the catalyst, etc., and achieve the effects of reducing the preparation cost, simple method and prolonging the service life.

Inactive Publication Date: 2011-04-06
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although these catalysts have high alkane conversion and olefin selectivity under certain reaction conditions, the catalyst preparation steps are cumbersome
Since the catalyst is prone to carbon deposition and deactivation under high temperature conditions, when hydrogen is used alone as a diluent in the dehydrogenation process, the service life of the catalyst is short and frequent regeneration is required, which is not good for the service life of the catalyst and affects production efficiency

Method used

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  • Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof
  • Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof
  • Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Catalyst-A" is composed of 0.4wt% Pt, 0.49wt% Sn (Pt:Sn=1:2), 1wt% K, and 1.73wt% Cl supported on alumina particles. The preparation method is as follows:

[0033] First take a certain amount of alumina particles, and then take a quantitative amount of SnCl dissolved in hydrochloric acid 2 Solution (as 0.49% Sn), quantitative H 2 PtCl 6 The solution (calculated as 0.4% Pt) is made into a mixed solution, and then a quantitative amount of K is added after the complex is formed. 2 CO 3 solution (1% K), and then diluted with hydrochloric acid to make the required volume. Immerse the alumina particles in the above solution and mix them evenly, then let them stand at room temperature for 10 hours, dry them at 120°C for 12 hours, and then bake them in a tube furnace at 500°C with 50ml / min air for 4 hours. Put 10ml of catalyst into the fixed bed reactor, at 480℃H 2 (150ml / min) reduction under normal pressure in air flow for 2 hours. Then the temperature was raised to 550°...

Embodiment 2

[0040] Catalyst "B" is composed of 0.4wt% Pt, 0.6wt% Sn (Pt: Sn=1: 2.5), 1wt% K, and 1.73wt% Cl supported on alumina particles. The preparation method is the same as in Example 1, and the reaction conditions are the same as in the example 1.

[0041] Catalyst "B" reaction performance as shown in Table 3

[0042] Table 3: Catalyst B isobutane dehydrogenation reaction performance

[0043]

Embodiment 3

[0044] Embodiment 3: Catalyst " C " is composed of 0.4wt% Pt, 0.73wt% Sn (Pt: Sn=1: 3), 1wt% K, 1.73wt% Cl loaded on the alumina particle, preparation method is the same as example 1, Reaction feed composition is the same as example 1.

[0045] Catalyst "C" reaction performance as shown in Table 4

[0046] Table 4: Catalyst C isobutane dehydrogenation reaction performance

[0047]

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Abstract

The invention relates to a catalyst for the preparation of isobutene by isobutene dehydrogenation as well as a preparation process and a dehydrogenation process thereof. In the catalyst, a heat-resistant oxide is used as a carrier, a platinum group metal element is used as a main catalyst, an IVA group metal element is used as a first assistant, an alkali metal element is used as a second assistant, and a halogen element is used as a modifier. The catalyst is prepared by loading a solution containing the active components onto the heat-resistant oxide carrier in one step by adopting an isopyknic immersion method, has higher isobutene conversion rate, better isobutene selectivity and favorable stability by using a mixture of hydrogen and water vapor as a diluent, and is suitable for the application in industrialized production.

Description

technical field [0001] The invention relates to the technical field of catalytic dehydrogenation, in particular to a catalyst for preparing isobutene from isobutane dehydrogenation and a preparation method thereof, and a dehydrogenation process for preparing isobutene from isobutane dehydrogenation using the catalyst. Background technique [0002] Isobutene is a very important organic chemical raw material, mainly used in the preparation of methyl tert-butyl ether (MTBE), butyl rubber and polyisobutylene. In addition, it can also be used to synthesize various organic raw materials and fine chemicals such as methacrylate, isoprene, tert-butylphenol, tert-butylamine, 1,4-butanediol, ABS resin, etc. With the continuous development of isobutene downstream products and its derivatives, the demand for isobutene is increasing day by day, while the conventional steam cracking process, due to its own production technology constraints, limits the increase in isobutene production. At ...

Claims

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Application Information

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IPC IPC(8): B01J27/135C07C11/09C07C5/333
Inventor 王际东王伟屈一新李逢昌邵振兴毛锐章赵娟
Owner BEIJING UNIV OF CHEM TECH
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