Dehydrogenation method for light alkanes

A technology for low-carbon alkanes and dehydrogenation, which is applied in the fields of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., and can solve problems such as the inability to control the depth of sulfidation as required.

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

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Problems solved by technology

But there is a problem that the vulcanizatio...

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  • Dehydrogenation method for light alkanes

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preparation example Construction

[0013] 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.

[0014] 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.

[0015] 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

[0030] Alumina is used as a carrier. The support was impregnated with 0.01M tin tetrachloride ethanol solution, dried, aged, and calcined at 650°C for 4 hours to obtain alumina pellets containing 0.3wt% Sn.

[0031] The alumina pellets containing 0.3wt% Sn were calcined at 800°C for 3h, the calcined carrier was immersed in 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 without reduction. The loading amount of each component in the catalyst is: Pt 0.5wt%, Sn 0.3wt%, K0.5wt%.

[0032] Restore conditions : High-purity hydrogen with a volumetric space velocity of 900h -1 , temperature 500 ° C, reduction time 1h.

[0033] Evaluation conditions : volumetric space velocity 2000 h -1 , the reaction temperature is 550°C, the raw materia...

example 2

[0041] A dehydrogenation catalyst was prepared in the same manner as in Example 1.

[0042] Restore conditions : High-purity hydrogen with a volumetric space velocity of 900 h -1 , temperature 500 ℃, reduction time 1h.

[0043] Evaluation conditions : volume airspeed 2000 h -1 , the reaction temperature is 550°C, the dehydrogenation raw material is a mixture of hydrogen: isobutane with a molar ratio of 1:1, and the content of methyl mercaptan in the dehydrogenation raw material is 5 μmol / mol.

[0044] Evaluation results : The catalyst was continuously evaluated for 60 hours, the isobutane conversion rate was 42.8%, the isobutene selectivity was 97.1%, the conversion rate decreased by 1.8%, the selectivity was basically unchanged, and the carbon deposition amount was only 0.31%, showing good catalytic activity. and stability.

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Abstract

The present invention discloses a dehydrogenation method for light alkanes, and the method comprises: the dehydrogenation catalyst, which is a platinum group metal-supported catalyst, is reduced by using the low concentration hydrogen before use; and after the reduction, a small amount of a sulfur compound is added into dehydrogenation raw materials for the dehydrogenation reaction directly, wherein the concentration of the sulfur compound is 5-100[mu]mol/mol in the dehydrogenation raw materials. 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 dehydrogenating low-carbon alkanes, in particular to 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 developed rapidly in ...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C5/333
Inventor 李江红张海娟张喜文宋喜军孙潇磊王振宇
Owner CHINA PETROLEUM & CHEM CORP
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