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Catalyst for iso-butane fluidized bed dehydrogenation and preparing method thereof

A catalyst and fluidized bed technology, which is applied to a catalyst for preparing isobutene by catalytic dehydrogenation of isobutane in a fluidized bed and the field of its preparation, can solve the problems of insufficient hydrothermal stability, high chromium oxide content, poor mechanical strength and the like, and achieve good Prospects for industrial application, optimal activity, and effect of reducing load

Active Publication Date: 2016-08-03
WUHAN KELIN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of existing isobutane dehydrogenation catalysts such as poor activity, high chromium oxide content, poor mechanical strength, and insufficient hydrothermal stability, the invention provides a fixed-bed isobutane dehydrogenation catalyst and a preparation method thereof

Method used

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  • Catalyst for iso-butane fluidized bed dehydrogenation and preparing method thereof
  • Catalyst for iso-butane fluidized bed dehydrogenation and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 5kg hydrated SBA15 (including 1.75kgSBA15), 2.54kgY(NO 3 ) 3 ·6H 2 O, 34.8kg bayerite (containing 22.5kgAl 2 o 3 ) into 168.6 kg of deionized water and stirred evenly, then slowly added 2.85 kg of concentrated nitric acid while stirring, beating at high speed for half an hour, and then pressure spray drying to obtain microspheres of 20-200 μm. The above microspheres were placed in a stone muffle furnace, and then calcined in a water vapor-air mixed atmosphere with a water vapor volume fraction of 10%, the calcining temperature was 800°C, the calcining time was 4h, and the volume space velocity of the mixed atmosphere was 2000h -1 , and the carrier is obtained after the calcination is completed.

[0025] Weigh 20g of CrO 3 , 3.53g of Ga(NO 3 ) 3 Dissolve in 117.6g of deionized water, stir evenly to obtain an impregnating liquid, take 30 g of carrier and impregnate in the above impregnating liquid for 10 min, then separate the impregnating liquid, dry the mic...

Embodiment 2

[0027] Weigh 12.8kg hydrated SBA15, 3.39kgY (NO 3 ) 3 ·6H 2 O, 34.2kg bayerite (containing 22.2kgAl 2o 3 ), 31.8kg pseudo-boehmite (containing 22.2kgAl 2 o 3 ) into 149.6 kg of deionized water and stirred evenly, then slowly added 2.45 kg of concentrated nitric acid while stirring, beating at high speed for half an hour, and then pressure spray drying to obtain microspheres of 20-200 μm. The above microspheres were placed in a stone muffle furnace, and then calcined in a water vapor-air mixed atmosphere with a water vapor volume fraction of 30%, the calcining temperature was 800°C, the calcining time was 4h, and the volume space velocity of the mixed atmosphere was 500h -1 , and the carrier is obtained after the calcination is completed.

[0028] Weigh 20g of Cr(CH 3 COO) 3 , 0.571g of Ga(NO 3 ) 3 Dissolve in 57.1g of deionized water, stir evenly to obtain an impregnating solution, take 30 g of carrier and impregnate in the above impregnating solution for 10 minutes,...

Embodiment 3

[0030] Weigh 5.7kg hydrated SBA15, 2.12kgY (NO 3 ) 3 ·6H 2 O. Add 31.9kg of pseudoboehmite to 132.5kg of deionized water and stir evenly, then slowly add 1.99kg of concentrated nitric acid while stirring, beating at high speed for half an hour, and then pressure spray drying to obtain 20-200 μm microspheres. The above microspheres were placed in a stone muffle furnace, and then calcined in a water vapor-air mixed atmosphere with a water vapor volume fraction of 20%, the calcining temperature was 800°C, the calcining time was 4h, and the volume space velocity of the mixed atmosphere was 1000h -1 , and the carrier is obtained after the calcination is completed.

[0031] Weigh 20g of (NH 4 ) 2 Cr 2 o 4 , 2g of Ga(NO 3 ) 3 Dissolve in 80g of deionized water, stir evenly to obtain an impregnation solution, take 30 grams of carrier and immerse in the above impregnation solution for 10 minutes, then separate the impregnation solution, dry the microspheres at 120°C for 30 minu...

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Abstract

The invention provides a catalyst for preparing isobutene from iso-butane in a dehydrogenation mode through a fluidized bed and a preparing method thereof .According to the catalyst, Y2O3-modified SBA15-Al2O3 composite oxide serves as a carrier, Cr2O3 serves as an active component, A is an active assistant, and B is a structure assistant; the assistant A is IIIA element oxide, the assistant B is IVA element oxide, the mass fraction of Y2O3 in the carrier ranges from 1wt% to 5wt%, the mass fraction of SBA15 molecular sieves ranges from 5wt% to 10wt%, and the balance is aluminum oxide; finally, in the catalyst, the mass fraction of Cr2O3 ranges from 10% to 15%, the mass fraction of the assistant A ranges from 1% to 3%, the mass fraction of the assistant B ranges from 0.5% to 1.5%, and the balance is the carrier .The catalyst has excellent dehydrogenation activity, excellent mechanical strength, excellent heat stability and broad industrial prospects.

Description

technical field [0001] In general terms, the present invention relates to the field of catalysts. Specifically, the invention relates to a catalyst for preparing isobutene by catalytic dehydrogenation of isobutane in a fluidized bed and a preparation method thereof. Background technique [0002] Isobutene is a very important organic chemical intermediate, mainly used in the preparation of methyl tert-butyl ether (MTBE, high-octane clean gasoline blending component), butyl rubber, polyisobutylene, methacrylate, tert-butyl Various organic raw materials and fine chemicals such as phenol, tert-butylamine, 1,4-butanediol, ABS resin, etc. In recent years, with the rapid development of petrochemical and related industries, my country's demand for isobutene is also increasing. The production of isobutene by catalytic dehydrogenation of isobutane is an effective way to increase the production of isobutene, but in the past, isobutane was usually used in my country And other low-carbo...

Claims

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Application Information

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IPC IPC(8): B01J29/03C07C5/333C07C11/09
CPCB01J29/0341B01J2229/26C07C5/3332C07C2529/03C07C11/09
Inventor 袁鹏王国兴张先茂王泽王天元郑敏陈凯赵志杰
Owner WUHAN KELIN FINE CHEM