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Method for preparing olefins by using dehydrogenation of light alkanes with sulfur-containing substances added in raw materials

A dehydrogenation and material technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve problems such as the inability to control the vulcanization depth as required

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is a problem that the vulcanization depth cannot be controlled according to the needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The dehydrogenation catalyst can be prepared by a conventional method, such as using an impregnation method to support the dehydrogenation active metal, and the auxiliary agent can be introduced during the preparation of the alumina or weakly acidic molecular sieve carrier and / or by an impregnation method.

[0013] The catalyst of the present invention uses alumina or weakly acidic molecular sieve as a carrier, and the dehydrogenation active metal component is generally selected from one or more of platinum, palladium, iridium, rhodium or osmium in the platinum group, and the amount used is calculated as a carrier 0.01%~2% of the weight. The content of Sn is 0.1%~10% of the weight of the carrier in terms of simple substance.

[0014] In the dehydrogenation catalyst based on alumina or weakly acidic molecular sieve of the present invention, the dehydrogenation active metal component can be evenly distributed in the catalyst, preferably the dehydrogenation active metal co...

example 1

[0029] The spinel phase carrier was impregnated with tin tetrachloride ethanol solution, dried, and calcined at 600°C for 4 hours to obtain a spinel phase containing 0.3wt% Sn. The spinel phase containing 0.3wt% Sn was calcined at 800°C for 3h, the calcined support was impregnated with an aqueous solution containing chloroplatinic acid for 6h at 70°C, dried at 120°C for 2h, and calcined at 500°C for 4h. Dechlorination in air containing 20v% water vapor at 450°C for 4h. Then at 70 °C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The loading amount of each component in the catalyst is: Pt 0.5wt%, Sn 0.3wt%, K0.5wt%.

[0030] evaluation conditions : volumetric space velocity 2000 h -1 , the reaction temperature is 600°C, the raw material for dehydrogenation is a mixed raw material with a molar ratio of hydrogen:isobutane of 2:1, and the content of methyl mercaptan in the raw material for dehydrogenation is 10 μmol / mol.

[0031] ...

example 2

[0038] The dehydrogenation catalyst was prepared in the same manner as in Example 1.

[0039] evaluation conditions : volumetric space velocity 2000 h -1 , the reaction temperature is 600°C, the raw material for dehydrogenation is a mixture with a molar ratio of hydrogen: isobutane of 2:1, and the content of methyl mercaptan in the raw material for dehydrogenation is 5 μmol / mol.

[0040] Evaluation results : After continuous evaluation of the catalyst for 40 hours, the conversion rate of isobutane was 46.8%, the selectivity of isobutene was 98.1%, the conversion rate decreased by 2.8 percentage points, the selectivity remained basically unchanged, and the carbon deposition amount was only 0.39%, showing good catalytic performance. activity and stability.

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Abstract

The present invention discloses a method for preparing olefins by using dehydrogenation of light alkanes with sulfur-containing substances added in raw materials, comprising: the dehydrogenation catalyst, which is a platinum group metal-supported catalyst, is not subjected to a reduction and sulfurization before use; and a small amount of sulfur-containing materials are added in the dehydrogenation raw materials for a dehydrogenation reaction directly, wherein the concentration of the sulfur-containing materials in the dehydrogenation raw materials is 5-100 [mu]mol / mol. Compared with the prior art, the method of the present invention improves the stability of the dehydrogenation catalyst, and can effectively prolong the service life of the dehydrogenation catalyst and reduce the carbon deposition rate of the catalyst, thereby improving the economic benefits of preparing corresponding olefins by using light hydrocarbon dehydrogenation.

Description

technical field [0001] The invention relates to a method for preparing olefins by dehydrogenating low-carbon alkanes, in particular a process for preparing corresponding olefins by dehydrogenating C3-C5 alkanes. Background technique [0002] Since the beginning of the new century, human demand for the world's petrochemical raw materials and petrochemical products will continue to grow, and the demand for olefins such as propylene as petrochemical basic raw materials will continue to grow. However, traditional conventional methods can no longer meet the rapidly growing demand. global shortage. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to diversifying the technical route of raw materials, especially the technical route of preparing olefins from low-carbon alkanes as raw materials. In recent years, the technology of producing propylene from low-carbon alkanes has dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/333C07C11/02C07C11/09B01J23/62
Inventor 李江红张海娟张喜文王振宇宋喜军其他发明人请求不公开姓名
Owner CHINA PETROLEUM & CHEM CORP
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