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Catalyzer used for low carbon alkane catalytic dehydrogenation and method of manufacturing propylene by paraffin hydrocarbons catalytic dehydrogenation with the same as catalyzer

A technology for catalytic dehydrogenation and low-carbon alkanes, which is applied in the field of catalytic dehydrogenation of paraffins to propylene, can solve problems such as no reports of industrial applications, achieve significant social and economic benefits, optimize utilization, and alleviate the increasing demand for propylene Effect

Inactive Publication Date: 2008-01-23
SINOPEC JINLING PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst is currently in the research stage, and there is no report on industrial application

Method used

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  • Catalyzer used for low carbon alkane catalytic dehydrogenation and method of manufacturing propylene by paraffin hydrocarbons catalytic dehydrogenation with the same as catalyzer
  • Catalyzer used for low carbon alkane catalytic dehydrogenation and method of manufacturing propylene by paraffin hydrocarbons catalytic dehydrogenation with the same as catalyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Firstly, ion-exchange HZSM-5 molecular sieve with a carrier silicon-aluminum ratio of 120 and NaCl aqueous solution, and then magnetically stir at 80°C for 4 hours, then dry at 150°C for 5 hours, so that a certain amount of sodium ions are loaded on the carrier. Then, the carrier containing sodium element was exchanged with chloroplatinic acid solution, magnetically stirred at 80° C. for 4 hours, dried at 150° C. for 5 hours, and then calcined at 500° C. for 6 hours. The tin tetrachloride solution is impregnated with the twice-exchanged carrier, and the drying and roasting conditions are the same as before. Add 20% alumina to the prepared catalyst powder and extrude it. The finished catalyst contains Pt0.5%, Sn2%, Na0.4%.

[0025] The dehydrogenation reaction of the present invention adopts a fixed-bed reactor, and the initial reaction temperature is 580°C, which is gradually increased according to the reaction conditions, and the final temperature reaches 620°C, the p...

Embodiment 2

[0027] Firstly, ion-exchange HZSM-5 molecular sieve with a carrier silicon-aluminum ratio of 120 and NaCl aqueous solution, and then magnetically stir at 100°C for 4 hours, then dry at 150°C for 5 hours, so that a certain amount of sodium ions are loaded on the carrier. Then, the carrier containing sodium element was exchanged with chloroplatinic acid solution, magnetically stirred at 100° C. for 4 hours, dried at 150° C. for 5 hours, and then calcined at 500° C. for 6 hours. The tin tetrachloride solution is impregnated with the twice-exchanged carrier, and the drying and roasting conditions are the same as before. Add 20% alumina to the prepared catalyst powder and extrude it. The finished catalyst contains Pt0.5%, Sn2%, Na1.2%.

[0028] The initial reaction temperature is 590°C, gradually increased according to the reaction conditions, and the final temperature reaches 620°C, the pressure is 0.1MPa, and the gas space velocity is 3.5h -1 . The average value of result conv...

Embodiment 3

[0030]As another comparative test, ZSM5 with a silicon-to-aluminum ratio of 100 was used as a carrier, other preparation conditions of the catalyst were the same as above, and the reaction conditions were the same as in Example 1. The silicon-aluminum ratio of the carrier molecular sieve has obvious influence on the performance of the catalyst. Experiments have confirmed that catalysts prepared by molecular sieves with too high or too low a silicon-to-aluminum ratio basically or completely lose their dehydrogenation performance (see Figure 3).

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Abstract

The invention relates to a catalyst used for catalyzing and dehydrogenation of low-carbon alkane and the method of producing propylene by alkane catalyzing and dehydrogenation with the catalyst. The former catalyst used for catalyzing and dehydrogenation of low-carbon alkane, each molecule of the hydrocarbon has about 2 to 8 carbon atom, which is characterized in that: the catalyst makes a molecular sieve the carrier, the Pt family metal is loaded on the carrier as the active component, makes the IVA family metal element and alkalinity metal element as additional agent and high temperature standing inorganic oxide as connection agent; when the catalyst is used in producing propylene by alkane catalyzing and dehydrogenation, the reaction temperature is 500 to 700 DEG C., the pressure is 0 to 0.2Mpa, the quality air speed is 2 to 5h to 1, the regenerating temperature of the catalyst is 500 to 700 DEG C., the air speed is 100 to 1000h to 1, the pressure is 0 to 1.0MPa. With adopting the invention, the reaction of producing propylene by alkane catalyzing and dehydrogenation is good, the average transforming rate is 30 per cent, the selectivity above 95 per cent can keep for 50 days.

Description

technical field [0001] The invention relates to a catalyst for catalytic dehydrogenation of low-carbon alkanes and a method for producing propylene by catalytic dehydrogenation of paraffins using the catalyst. Background technique [0002] Propane dehydrogenation to propylene is an important petrochemical process, and its product propylene is an important organic chemical raw material used in the industrial production of polypropylene, acrylonitrile and propylene oxide. In recent years, with the rapid growth of the demand for derivatives such as polypropylene, the demand for propylene is also expanding. [0003] The source of propylene is mainly the by-product of olefin cracking, but the yield of propylene is very low. In recent years, the production technology of catalytic dehydrogenation of propane to propylene (hereinafter referred to as PDH) has attracted increasing attention due to its high selectivity. So far, several technologies such as UOP's Oleflex process, Air P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J23/04B01J23/40B01J23/14C07C4/10
CPCY02P20/52Y02P20/584
Inventor 许艺王玉叶志良邱安定刘冬吴沛成
Owner SINOPEC JINLING PETROCHEMICAL CO LTD
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