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Vulcanization and startup method of dehydrogenation catalyst

A technology of dehydrogenation catalyst and sulfurizing agent, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problems of insufficient catalyst selectivity and stability

Active Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the dehydrogenation catalyst presulfurization method mainly adopts presulfurization in the reactor, the catalyst is loaded into the reactor, and then a vulcanizing agent is introduced for vulcanization. CN87101513A discloses a method of introducing sulfur components by wet vulcanization before reduction, which promotes The method for the activity and stability of the catalyst, the sulfur components are inorganic sulfides such as ammonium sulfide, potassium sulfide, sodium sulfide in this method, the experiment shows that the selectivity and stability of the catalyst after sulfidation are not enough

Method used

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  • Vulcanization and startup method of dehydrogenation catalyst

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preparation example Construction

[0014] 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 carrier and / or by an impregnation method.

[0015] The catalyst of the present invention uses Sn-containing alumina 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 is calculated as the weight of the carrier in terms of simple substance. 0.01% to 2%. The content of Sn is 0.1%-10% of the weight of the carrier in terms of simple substance.

[0016] In the dehydrogenation catalyst with Sn-containing alumina as the carrier, Sn is introduced into the Sn-containing material when the alumina is gelled, and then made into a carrier.

[0017] The specific process and conditions for the preparation and sulfidatio...

Embodiment 1

[0036] Catalyst PDH-FY was prepared in the same manner as Comparative Example 1. The molten elemental sulfur is introduced into the PDH-FY catalyst, the amount of elemental sulfur introduced is 120% of the theoretical sulfur demand of the catalyst, and then impregnated with n-butyl acetate solvent, and the amount of elemental sulfur is 25% of the weight of the catalyst. Then treat at 180° C. for 6 hours at normal pressure and in the presence of water vapor, and pass 2 kg of steam per 50 kg of catalyst to obtain the final dehydrogenation catalyst FSHYPDH-1 containing a sulfurizing agent.

[0037] The reduction and dehydrogenation reactions of the catalyst were carried out under the same conditions as in Comparative Example 1. The evaluation results are shown in Table 1.

Embodiment 2

[0039] Catalyst PDH-FY was prepared in the same manner as Comparative Example 1. The n-butyl acetate solvent is uniformly impregnated on the PDH-FY catalyst, and its consumption is 25% of the weight of the catalyst. Then melted elemental sulfur is introduced into the catalyst, and the introduced amount of the elemental sulfur is 120% of the theoretical required sulfur amount of the catalyst. Then treat at 180° C. for 6 hours at normal pressure and in the presence of water vapor, and pass 2 kg of steam per 50 kg of catalyst to obtain the final dehydrogenation catalyst FSHYPDH-2 containing a sulfurizing agent.

[0040] During reduction, the concentration of ammonia in hydrogen was 2.0%, the reduction temperature was 480° C., and the reduction time was 1 hour. Other processes and conditions were the same as in Comparative Example 1. The evaluation results are shown in Table 1.

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Abstract

The invention discloses a vulcanization and startup method of a dehydrogenation catalyst. The method has the following process of: employing a platinum-group supported dehydrogenation catalyst to conduct vulcanization treatment, which is composed of: dipping the dehydrogenation catalyst with a solution containing a vulcanizing agent, then carrying out thermal treatment in the presence of water vapor, and finally adopting ammonia-containing hydrogen for reduction treatment and dehydrogenation reaction. Compared with prior art, on the basis of simplifying a dehydrogenation catalyst startup process, the method of the invention improves the application performance of a catalyst, especially target product selectivity and activity stability of the catalyst.

Description

technical field [0001] The invention relates to a sulfidation method for a saturated alkane dehydrogenation catalyst, in particular to a sulfide method for a C3-C7 alkane dehydrogenation olefin catalyst. 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 propylene as the basic petrochemical raw material will continue to grow. However, traditional conventional methods can no longer meet the rapidly growing demand, making the market a global market. shortage. And with the increasing scarcity of petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw materials, especially the technical route of producing propylene with low-carbon alkanes as raw materials. In recent years, the technology of producing propylene (PDH) from low-carbon alkane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/00B01J23/40B01J23/62C07C5/333C07C11/09
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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