Saturated alkane dehydrogenation method

A technology for alkane and dehydrogenation, which is applied in the field of C3~C7 alkane dehydrogenation to olefins. It can solve the problems affecting the overall activity of the catalyst and achieve the effects of inhibiting the formation of SnPt alloy, improving utilization rate and convenient operation.

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dehydrogenation catalyst used in this method is a platinum group supported catalyst prepared by a conventional method, in which the platinum group metal exists in an oxidized state and needs to be reduced by heating to become active, but the reduction process will affect the overall activity of the catalyst, and the catalyst life cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The catalyst precursor was prepared in the same manner as in Comparative Example 1. Then the catalyst is impregnated with a sulfurizing agent amount of 120% of the theoretical sulfur requirement of the dehydrogenation catalyst active metal, and the sulfurizing agent is ammonium sulfide, and dried (air atmosphere) at 120° C. for 4 hours to obtain a presulfided dehydrogenation catalyst. a.

[0048] Add 250mL of 0.005 mol / L chloroplatinic acid ethylene glycol solution to 48g of Sn-containing alumina carrier (dry basis), stir, and heat to reflux for 2h at a reflux temperature of 80°C. Then slowly add 32mL of 0.4 mol / L KOH ethylene glycol solution into the above system, raise the reflux temperature to 180°C, heat to reflux for 30min, and then cool to room temperature. The solution was filtered off and washed with deionized water until there was no chloride ion in the filtrate. Vacuum-dried at 120°C for 4h, then calcined at 500°C for 4h under nitrogen atmosphere. The resul...

Embodiment 2

[0052] The catalyst A prepared in Example 1 and the dehydrogenation catalyst B prepared in Example 1 were used.

[0053] The upper end of the dehydrogenation reactor is filled with catalyst A, and the lower end is filled with catalyst B. Wherein, the packing volume ratio of catalyst A and catalyst B is 1.5: 1.

[0054] The reaction conditions are: volumetric space velocity 3000 h -1 , the reaction pressure is 0.1MPa, the reaction temperature is 600°C, and the molar ratio of hydrogen:propane is 1:1. Catalyst evaluation results are shown in Table 1 and Table 2.

Embodiment 3

[0056] Catalyst A prepared in Example 1 was used.

[0057] Add 300mL of 0.005 mol / L chloroplatinic acid ethylene glycol solution to 48g of Sn-containing alumina carrier (dry basis), stir, and heat to reflux for 2h at a reflux temperature of 80°C. Then slowly add 75mL of 0.4 mol / L KOH ethylene glycol solution into the above system, raise the reflux temperature to 180°C, heat to reflux for 30min, and then cool to room temperature. The solution was filtered off and washed with deionized water until there was no chloride ion in the filtrate. Vacuum-dried at 120°C for 4h, then calcined at 500°C for 4h under nitrogen atmosphere. The resulting solid, used at 70 °C containing KNO 3 Immerse in aqueous solution for 2 hours, vacuum dry at 120°C for 4 hours, and then bake at 500°C for 4 hours under nitrogen atmosphere. Catalyst C is prepared. The content of each component in the prepared catalyst is: Sn 0.3 wt%, Pt 0.6 wt%, K 1.0 wt%.

[0058] The upper end of the dehydrogenation rea...

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Abstract

The invention discloses a saturated alkane dehydrogenation method. According to the method, a presulfurization dehydrogenation catalyst and a reduced dehydrogenation catalyst are added into a reactor; conditions needed by a dehydrogenation reaction are regulated; and the dehydrogenation reaction is carried out. According to the invention, when the reduced dehydrogenation catalyst is prepared, SnPt alloy generation can be effectively inhibited, precious metal Pt utilization rate can be improved, and catalyst stability can be improved. The reduced dehydrogenation catalyst cooperates with the presulfurization dehydrogenation catalyst, such that a reduction process can be eliminated before the reaction. Therefore, an operation process can be simplified; operation cost can be reduced; and the catalysts as a whole have high initial activity, good selectivity, slow deactivation rate, and long service cycle.

Description

technical field [0001] The invention relates to a method for dehydrogenating saturated alkanes, in particular to a method for dehydrogenating C3-C7 alkanes to produce olefins. 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 from low-carbon alkanes has developed rapidly in areas w...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J37/16C07C11/06C07C5/333
CPCY02P20/52
Inventor 李江红张海娟王振宇乔凯
Owner CHINA PETROLEUM & CHEM CORP
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