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A kind of method for preparing isobutene

A technology of isobutene and methyl bromide, which is applied in the field of isobutene production, can solve the problems of low selectivity of a single product, high selectivity of methyl bromide to synthesize isobutene, etc., and achieve simple and easy activation method, high conversion rate of methyl bromide and selectivity of isobutene, The effect of mild conditions

Active Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technology with higher value-added low-carbon olefins as the target product, the selectivity of a single product is not high, and no relevant reports have been found on the synthesis of isobutene with high selectivity from methyl bromide

Method used

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  • A kind of method for preparing isobutene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on alumina (the pore volume is 0.71ml / g, the specific surface area is 236m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, dried at 120°C for 4h, and calcined at 500°C for 8h to obtain the catalyst precursor ZnO / Al 2 o 3 . Put 5g of the catalyst precursor in a continuous flow fixed-bed reactor, and use a mixed gas of methyl bromide and nitrogen to treat the catalyst precursor. The volume concentration of methyl bromide is 80%, and the treatment conditions are 250°C, 0.3MPa (absolute pressure), 300h -1 , time 2h, prepared isobutene catalyst halide, denoted as C-1. Get catalyst weight composition as ZnBr 2 The weight content based on bromide is 30%, the weight content of ZnO based on oxide is 4%, the total acid content in the catalyst below 450°C is 0.93mmol / g, and the acid content between 250°C and 350°C accounts for the total acid content below 450°C 63.2% of the total...

Embodiment 2

[0029] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on alumina (the pore volume is 0.71ml / g, the specific surface area is 236m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, dried at 80°C for 8h, and calcined at 600°C for 4h to obtain the catalyst precursor ZnO / Al 2 o 3 . Put 5g of the catalyst precursor in a continuous flow fixed-bed reactor, and use bromomethane to treat the catalyst precursor at 250°C, 0.2MPa (absolute pressure), 100h -1 , Time 2h, prepared isobutylene halide catalyst, denoted as C-2. Catalyst weight composition is ZnBr 2 The weight content is 39%, the ZnO weight content is 6%, the total acid content in the catalyst below 450°C is 0.98mmol / g, and the acid content at 250°C-350°C accounts for 64.5% of the total acid content below 450°C.

Embodiment 3

[0031] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on alumina (the pore volume is 0.71ml / g, the specific surface area is 236m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, vacuum dried at 100°C for 8h, and calcined at 400°C for 8h to prepare the catalyst precursor ZnO / Al 2 o 3 . Put 5g of the catalyst precursor in a continuous flow fixed-bed reactor, and use a mixed gas of bromomethane and nitrogen to treat the catalyst precursor. The volume concentration of bromomethane is 30%, and the treatment conditions are 300°C, 0.1MPa (absolute pressure), 500h -1 , Time 4h, prepared isobutylene halide catalyst, denoted as C-3. Get catalyst weight composition as ZnBr 2 The weight content based on bromide is 18%, the weight content of ZnO based on oxide is 2%, the total acid content in the catalyst below 450°C is 0.72mmol / g, and the acid content between 250°C and 350°C accounts for the total acid content below 450°C 66.1% of the...

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Abstract

The invention discloses a method for preparing isobutene from bromomethane. The method comprises the following steps: firstly, a bromomethane conversion catalyst for preparation of isobutene is subjected to low-temperature processing in the mixed atmosphere of ether-containing compounds and is then activated through a hydrogen-containing mixed atmosphere, the content of bromine in the activated catalyst is 30%-80% that of bromine in the catalyst before activation, the activated catalyst and haloalkane are contacted, and isobutene is obtained; the bromomethane conversion catalyst for preparation of isobutene comprises 0.5%-20% by weight of zinc oxide, 10%-50% by weight of zinc bromide and 40%-90% by weight of a carrier, wherein the carrier is one or more of alumina, silica, a ZSM-5 molecular sieve and the like. With the adoption of the method, the selectivity of isobutene can be improved.

Description

technical field [0001] The invention relates to a method for preparing isobutene, in particular to a method for using methyl bromide to prepare isobutene. Background technique [0002] Isobutene is an important basic organic chemical raw material. Its derivative products are numerous, the upstream and downstream industrial chains are complicated, and the consumption structure shows a trend of diversification. A variety of high value-added products can be prepared from isobutylene, such as: butyl rubber, polyisobutylene, methyl tert-butyl ether, isoprene and organic glass and other organic chemical raw materials and fine chemical products. As the market scale of isobutene downstream products continues to expand, the contradiction between supply and demand will gradually become prominent, especially in the context of the depletion of oil resources, the output of isobutene has become a key bottleneck restricting the development of downstream industries. Therefore, it is immine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/26C07C11/09B01J27/138
Inventor 张舒冬张信伟孙晓丹李杰倪向前张喜文刘继华
Owner CHINA PETROLEUM & CHEM CORP
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