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A kind of catalyst for preparing isobutene and preparation method thereof

A catalyst and isobutylene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve uniform catalyst structure, reduce investment costs, and high selectivity

Active Publication Date: 2017-11-24
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 SL-1 was obtained by calcining at ℃ for 6h, in which the weight ratio of alumina modified by silicon and tin to amorphous silicon aluminum was 1:10. The specific evaluation results in the fixed bed process are shown in Table 1.

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 8 hours and calcined at 650°C for 3 hours ...

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 ) 2Aqueous 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 SL-3 was obtained by calcining at ℃ for 6 hours, in which ...

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Abstract

The invention discloses a catalyst for preparing isobutene and a preparation method thereof. The catalyst has a core-shell structure, the core is amorphous silica-alumina, and the shell is alumina modified by silicon and tin. The two organically cooperate to realize the two reactions of MTBE cracking and TBA dehydration to generate isobutylene simultaneously, so that the TBA The conversion rate and the conversion rate of MTBE are high, and the selectivity to generate isobutene is also high.

Description

technical field [0001] The invention relates to a cracking catalyst and a preparation method thereof. The catalyst 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14B01J23/62B01J23/835C07C11/09C07C1/20
Inventor 张淑梅周峰乔凯翟庆铜王春梅
Owner CHINA PETROLEUM & CHEM CORP
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