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A kind of preparation method of isobutene

A technology of isobutene and reactor, applied in the field of isobutene preparation, to achieve uniform catalyst structure, high conversion rate and isobutene selectivity, and increase slurry viscosity

Active Publication Date: 2018-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a single type of catalyst, either the B acid or the L acid is the main type, not both

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The aluminum hydroxide slurry LRJ1-2 containing tin and silicon in Comparative Example 2 was sprayed and dipped on the amorphous silicon-aluminum powder FM1-1 in Comparative Example 1, then dried at 120°C for 4h and calcined at 500°C for 6h. Then add small-pore alumina with a weight ratio of 10wt% as a binder, shape it into catalyst pellets with a particle size between 2.2 mm and 2.5 mm by spherical granulation molding method, dry at 120 ° C for 4 hours, and pass through 400 The catalyst was calcined at ℃ for 6h to obtain the catalyst SL-1, in which the weight ratio of alumina modified by silicon and tin to amorphous silicon aluminum was 1:10. The specific evaluation results are shown in Table 1 and Table 4.

Embodiment 2

[0046]Under the condition of stirring, tin tetrachloride and trimethylchlorosilane were slowly added to the aluminum hydroxide slurry LRJ2 (solid content 31.2wt%) respectively. A mixed slurry containing silicon and tin (LRJ2-2) was obtained, wherein the amount of tin tetrachloride added in terms of tin accounted for 0.65wt% of pseudo-boehmite based on the weight of alumina; the amount of trimethylchlorosilane calculated in terms of silicon The added amount accounts for 0.85wt% of the pseudo-boehmite based on the weight of alumina. This slurry was spray-dipped on the amorphous silicon-alumina powder FM1-1 in Comparative Example 1, then dried at 90°C for 8 hours, and then calcined at 600°C for 3 hours. Then add 7.5wt% small-porous alumina and 2.0wt% methylcellulose as binder and molding aid respectively, and shape it into a particle size of 2.6mm-2.9mm by spherical granulation molding method The catalyst pellets were dried at 90°C for 8h and calcined at 650°C for 3h to obtain c...

Embodiment 3

[0048] The amorphous silicon aluminum powder FM2 (wherein SiO 2 Content 82.2wt%, Al 2 o 3 The content is 17.8wt%; the specific surface area is 335m 2 / g, the pore volume is 0.78mL / g), after being treated with saturated water vapor at 200℃ for 16h, impregnated in an appropriate amount of Be(NO 3 ) 2 Aqueous solution (solution concentration: 1.50mol / L), then roasted at 500°C for 5h to obtain amorphous silicon-aluminum powder FM2-1 containing 1.02wt% beryllium oxide. The mixed slurry LRJ1-2 containing tin and silicon in Comparative Example 2 was sprayed and dipped onto the amorphous silicon-aluminum powder FM2-1, then dried at 150°C for 1.5h, and calcined at 650°C for 4h. Then add small-pore alumina with a weight ratio of 18wt% as a binder, shape it into catalyst pellets with a particle size between 2.2 mm and 2.5 mm by spherical granulation molding method, dry at 120 ° C for 4 hours, and pass through 400 The catalyst was calcined at ℃ for 6h to obtain catalyst SL-3, in whic...

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Abstract

The invention discloses a method used for preparing isobutene from a MTBE-TBA mixture. According to the method, fixed bed technology is adopted, and reaction is carried out in a two-stage reactor; MTBE, TBA, and water are taken as raw materials, and are delivered into a first stage reactor for contact reaction with a catalyst; and a mixed material of an obtained production with MTBE and TBA is delivered into a second stage reactor for contact reaction with the catalyst so as to prepare isobutene; wherein the catalyst used in first stage reactor and the second stage reactor is a core-shell catalyst, amorphous silica-alumina is taken as the core, and the shell is silicon and stannum modified aluminium oxide. In the method, isobutene is generated via simultaneous MTBE pyrolysis and TBA dehydration, conversion rate of TBA and conversion rate of MTBE are both high, adding amount of water in MTBE pyrolysis is reduced, reaction energy consumption is reduced, and selectivity of production of isobutene is relatively high.

Description

technical field [0001] The invention relates to a method for preparing isobutene, which is especially suitable for preparing isobutene from a mixture of MTBE (methyl tert-butyl ether) and TBA (tert-butanol). Background technique [0002] Isobutylene is an important organic chemical raw material, which is mainly used to produce methyl methacrylate (MMA), butyl rubber, polyisobutylene, tert-butylphenol, tert-butylamine, methallyl chloride, trimethylacetic acid, Isoprene, p-tert-octylphenol, antioxidants, agricultural and pharmaceutical intermediates, tert-butyl acetate, silane and other fine chemical products. The raw materials for the production of isobutene mainly come from the by-product C4 fraction of the naphtha steam cracking ethylene plant, the by-product C4 fraction of the fluid catalytic cracking (FCC) unit of the refinery and the by-product C4 fraction in the synthesis of propylene oxide by the Halcon method. Butanol, etc., among which the industrial production meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/09C07C1/20C07C1/24B01J23/14
Inventor 张淑梅周峰乔凯翟庆铜王春梅
Owner CHINA PETROLEUM & CHEM CORP
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