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A kind of catalyst for preparing isobutene and its preparation method and application

A catalyst and isobutylene technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of undiscovered methyl bromide and low selectivity of a single product, and achieve precise controllable active centers and mild reaction conditions , easy to industrialize the effect

Active Publication Date: 2018-10-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the existing literature on the conversion of methyl halides, the target products are mainly methanol and dimethyl ether, in addition to acetic acid, high-carbon hydrocarbons, ethylene and propylene, and in the technology with olefins as the target product, the product is mostly ethylene. , propylene, and 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Dissolve appropriate amount of zinc nitrate and zirconium nitrate in deionized water, load them on the alumina carrier by equal volume impregnation method, dry at 120°C for 4h, and calcinate at 350°C for 8h to prepare the catalyst precursor. The catalyst precursor was treated with 20wt% hydrobromic acid solution in a rotary evaporator at a temperature of 60°C for 4 hours. Prepare the catalyst. Catalyst weight composition is ZnBr 2 The weight content is 30.1%, the ZnO weight content is 3.6%, and the ZrO 2 The weight content is 5.1%. The total acid content below 450°C in the catalyst is 0.84mmol / g, and the acid content between 250°C and 350°C accounts for 59.55% of the total acid content below 450°C.

[0029] The conversion of methyl bromide to isobutene is carried out in a continuous-flow miniature fixed-bed reactor. The catalyst loading is 5g, the raw material gas is a mixed gas of bromomethane and nitrogen, and the volume content of bromomethane is 50%, the reaction...

Embodiment 2

[0031] Catalyst preparation is the same as embodiment 1, and difference is that gained catalyst weight composition is ZnBr 2 The weight content is 13.3%, the ZnO weight content is 0.6%, and the ZrO 2 The weight content is 5.2%. The total acid content below 450°C in the catalyst is 0.72mmol / g, and the acid content at 250°C-350°C accounts for 50.15% of the total acid content below 450°C. The conversion of methyl bromide to isobutene is carried out in a continuous-flow miniature fixed-bed reactor. The catalyst loading is 5g, the raw material gas is a mixed gas of bromomethane and nitrogen, of which the volume content of bromomethane is 70%, the reaction temperature is 230°C, the reaction pressure is 2MPa (absolute pressure), and the space velocity is 200h -1 . Before feeding the raw material gas, the catalyst is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 80%, the reducing conditions are 450°C, 0.3MPa (absolute pressu...

Embodiment 3

[0033] Catalyst preparation is the same as embodiment 1, and difference is that gained catalyst weight composition is ZnBr 2 The weight content is 33.6%, the ZnO weight content is 9.1%, and the ZrO 2 The weight content is 4.9%. The total acid content below 450°C in the catalyst is 0.90mmol / g, and the acid content between 250°C and 350°C accounts for 63.94% of the total acid content below 450°C. The conversion of methyl bromide to isobutene is carried out in a continuous-flow miniature fixed-bed reactor. The catalyst loading is 5g, the raw material gas is a mixed gas of methyl bromide and nitrogen, of which the volume content of methyl bromide is 80%, the reaction temperature is 200°C, the reaction pressure is 3MPa (absolute pressure), and the space velocity is 350h -1 . Before feeding the raw material gas, the catalyst is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 50%, the reducing conditions are 500°C, 0.1MPa (ab...

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Abstract

The invention discloses a catalyst for preparing isobutene, a preparation method thereof and application. The preparation method of the catalyst comprises the following steps: firstly, loading zinc element precursor and zirconium element precursor onto an aluminum oxide carrier through a co-impregnation method, and drying and calcining to obtain a catalyst precursor; secondly, adding haloid acid solution for the catalyst precursor obtained in the first step, performing evaporation treatment, with the addition of haloid acid being 0.5 to 20 percent of the weight fraction of zinc oxide in the final catalyst and 10 to 50 percent of the weight fraction of zinc halide, so as to obtain the catalyst for preparing isobutene. The catalyst is used for preparing isobutene through bromomethane, and can improve the selectivity of isobutene.

Description

technical field [0001] The present invention relates to a catalyst for preparing isobutene and its preparation method and application, in particular to a catalyst for preparing isobutene with high selectivity of methyl halide and its preparation method and application. 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/138C07C11/09C07C1/26
Inventor 张信伟张舒冬李杰孙晓丹倪向前尹泽群刘全杰张喜文
Owner CHINA PETROLEUM & CHEM CORP