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A kind of regeneration method of Al2O3 supported platinum-tin dehydrogenation catalyst

A technology of dehydrogenation catalyst and aluminum oxide, which is applied in the direction of catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of loss of activity and achieve improvement Active, reduce energy waste, and prolong service life

Active Publication Date: 2020-05-12
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the process of propane dehydrogenation to propylene is carried out in a high temperature environment of 550-700 °C, the catalyst using aluminum oxide supported platinum tin will gradually lose its activity due to carbon deposition on the surface and pores of the catalyst and platinum tin agglomeration

Method used

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  • A kind of regeneration method of Al2O3 supported platinum-tin dehydrogenation catalyst

Examples

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Effect test

example 1

[0058] After the Al2O3-supported platinum tin propane dehydrogenation to propylene catalyst is deactivated (the conversion rate of propane is lower than 15% or the selectivity of propylene is lower than 85%), the catalyst is regenerated. Reduce the temperature of the catalyst bed to 400°C, and pass through the regeneration treatment gas, wherein the oxygen content is 0.5%, the chlorinating agent content is 5%, and the gas space velocity is 2000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 450°C, the oxygen content was raised to 3%, the chlorinating agent monochloromethane content was maintained at 5%, and the gas space velocity was 2000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 500°C, the oxygen content was raised to 8%, the chlorinating agent content was maintained at 5%, and the gas space velocity was 2000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 550°C, the oxygen content was rai...

example 2

[0061] After the Al2O3-supported platinum tin propane dehydrogenation to propylene catalyst is deactivated (the conversion rate of propane is lower than 15% or the selectivity of propylene is lower than 85%), the catalyst is regenerated. Lower the temperature of the catalyst bed to 400°C, and pass through the regeneration treatment gas, wherein the oxygen content is 0.5%, the chlorinating agent methylene chloride content is 5%, and the gas space velocity is 4000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 450°C, the oxygen content was raised to 3%, the chlorinating agent content was maintained at 5%, and the gas space velocity was 4000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 500°C, the oxygen content was raised to 8%, the chlorinating agent content was maintained at 5%, and the gas space velocity was 4000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 550°C, the oxygen content was rai...

example 3

[0064] After the Al2O3-supported platinum tin propane dehydrogenation to propylene catalyst is deactivated (the conversion rate of propane is lower than 15% or the selectivity of propylene is lower than 85%), the catalyst is regenerated. Lower the temperature of the catalyst bed to 450°C, pass through the regeneration treatment gas, wherein the oxygen content is 0.5%, the chlorinating agent monochloromethane and trichloromethane content are 5%, and the gas space velocity is 3000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 500°C, the oxygen content was raised to 3%, the chlorinating agent content was maintained at 5%, and the gas space velocity was 3000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 550°C, the oxygen content was raised to 8%, the chlorinating agent content was maintained at 5%, and the gas space velocity was 3000 -1 , treated for 10 hours; then the catalyst bed temperature was raised to 600°C, the oxyge...

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Abstract

The invention provides a regeneration method of an aluminum oxide loaded platinum-tin dehydrogenation catalyst, and belongs to the technical field of catalyst regeneration. The regeneration method comprises burned carbon chlorination and reduction, wherein the burned carbon chlorination is to perform burned carbon chlorination by making a deactivated catalyst contact with regeneration gas; the reduction is to perform catalyst reduction by making the burned carbon contact with the chlorinated catalyst and the reduction gas, and purge a catalyst bed layer with nitrogen gas after finishing of thereduction in order to lower the hydrogen gas volume in the system at 0.5 percent or less. By adopting the regeneration method provided by the invention, carbon burning and chlorination are realized simultaneously. The regeneration method has the advantages that firstly, in the presence of a chlorinating agent, the phenomenon that a part of metal atoms are sintered excessively during separate burning of the carbon can be avoided, the activity of the catalyst after regeneration is increased, and the service life of the catalyst is prolonged; secondly, carbon burning and chlorination are performed simultaneously, so that the treatment time can be shortened, and energy waste is reduced in comparison with separate treatment.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, in particular to a regeneration method of an aluminum oxide-supported platinum-tin dehydrogenation catalyst. Background technique [0002] Light olefins, especially propylene, are very important basic chemical raw materials. Propylene is mainly used in the synthesis of polypropylene, acrylonitrile, propylene oxide, cumene and other products. The source of traditional propylene is mainly the by-product of steam cracking to ethylene. As the market demand for propylene products continues to increase, the traditional propylene production process cannot meet the market demand. At present, we have introduced more than ten sets of Oleflex propane dehydrogenation to propylene units. Domestic scientific research institutions have successively carried out research and development of propane dehydrogenation to propylene catalysts and developed their supporting processes. [0003] Propane de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62B01J23/96B01J38/02B01J38/04B01J38/44
CPCB01J23/626B01J23/96B01J38/02B01J38/04B01J38/44
Inventor 潘相米韩伟谭亚南吴砚会何霖程牧曦艾珍王华郑敏
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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