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ZSM-5 zeolite catalyst for alkylation of benzene and methanol, preparation method and application thereof

A technology of ZSM-5 and zeolite catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as limited industrial application, limited industrial application value, and poor catalyst stability

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalysts used in the above two patents are HMCM-22 and HMCM-56 respectively. Although the selectivity has been improved, the stability of the catalyst is not very good, thus limiting its industrial application. Shanxi Hengyang Technology Co., Ltd. The patent applied for is only a change in process design and process conditions, and its industrial application value is also extremely limited
[0005] The disadvantages of the prior art are that the current catalysts are easily deactivated when used in the alkylation reaction of benzene and methanol, the conversion rate is low, and the product selectivity is poor.

Method used

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  • ZSM-5 zeolite catalyst for alkylation of benzene and methanol, preparation method and application thereof
  • ZSM-5 zeolite catalyst for alkylation of benzene and methanol, preparation method and application thereof
  • ZSM-5 zeolite catalyst for alkylation of benzene and methanol, preparation method and application thereof

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preparation example Construction

[0070] The present invention also provides a preparation method of ZSM-5 zeolite catalyst for alkylation of benzene and methanol, including the following steps:

[0071] 1) Take the microporous HZSM-5 molecular sieve with a silicon-to-aluminum ratio between 180-300, and add 0.005 to the microporous HZSM-5 molecular sieve at a solid-to-liquid ratio of 1:10-20 under the condition of pH 13-13.5. ~0.05mol / L sodium aluminate solution, stir for 40~60min to dissolve the molecular sieve;

[0072] 2) After the reaction is completed, perform an ice-water bath rapid cooling operation on the reactor to stop the reaction suddenly, filter with suction and wash until the filtrate is neutral, dry and roast the filter cake to obtain a white (or slightly yellow) powder;

[0073] 3) The obtained white (or slightly yellow) powder is fully stirred in the ethyl orthosilicate ethanol solution at 65~90℃ for 90~140min;

[0074] 4) Perform an ice-water bath rapid cooling operation on the reactor to stop the re...

Embodiment a

[0086] This embodiment provides a method for preparing a ZSM-5 zeolite catalyst for the alkylation of benzene and methanol, including the following steps:

[0087] 1) Take a microporous HZSM-5 molecular sieve with a silicon-to-aluminum ratio of 180, and add 0.005mol / L sodium aluminate solution to the microporous HZSM-5 molecular sieve according to a solid-to-liquid ratio of 1:10 under the condition of pH 13 , Stir for 40min to dissolve the molecular sieve;

[0088] 2) After the reaction, the reactor is quenched in an ice-water bath to stop the reaction suddenly, filtered with suction and washed until the filtrate is neutral, the filter cake is dried at 120°C for 3 hours, and then roasted in a muffle furnace at 500°C for 5 hours to obtain white (Or slightly yellow) powder;

[0089] 3) The obtained white (or slightly yellow) powder is fully stirred and reacted for 90 min in an ethanol solution of ethyl orthosilicate (a mixture of ethyl orthosilicate and ethanol at a molar ratio of 1:5...

Embodiment b

[0096] This embodiment provides a method for preparing a ZSM-5 zeolite catalyst for the alkylation of benzene and methanol, including the following steps:

[0097] 1) Take a microporous HZSM-5 molecular sieve with a silicon-to-aluminum ratio of 300, and add a 0.05 mol / L sodium aluminate solution to the microporous HZSM-5 molecular sieve at a solid-to-liquid ratio of 1:20 under the condition of pH 13.5 , Stir for 60min to dissolve the molecular sieve;

[0098] 2) After the reaction, the reactor is quenched in an ice-water bath to stop the reaction suddenly. The filter cake is filtered and washed until the filtrate is neutral. The filter cake is dried at 120°C for 6 hours, and then roasted in a muffle furnace at 550°C for 6 hours to obtain a white color. (Or slightly yellow) powder;

[0099] 3) The obtained white (or slightly yellow) powder is fully stirred and reacted for 140 min in a 90°C ethyl orthosilicate ethanol solution (a solution of ethyl orthosilicate and ethanol at a molar ...

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Abstract

The invention discloses a ZSM-5 zeolite catalyst for alkylation of benzene and methanol, a preparation method and an application thereof. The catalyst is composed of any one of [gamma]-Al2O3 or [eta]-Al2O3 and hierarchically-porous HZSM-5 molecular sieve as a carrier supporting MgO. On the basis that the total weight of the carrier is 100%, the carrier includes 50-80% of the HZSM-5 molecular sieve and 20-50% of any one of the [gamma]-Al2O3 or [eta]-Al2O3. The supporting load of the MgO is 1-12%. The catalyst has high selectivity on methylbenzene and dimethylbenzene and high stability.

Description

Technical field [0001] The invention relates to a catalyst in a petrochemical process, in particular to a catalyst for the alkylation of benzene and methanol. Background technique [0002] Benzene is mainly derived from catalytic reforming, isomerization of aromatics, and by-products of coal tar and ethylene production processes. According to reports, 150,000 tons of benzene is produced for every 800,000 tons of ethylene produced, and the growth of ethylene in my country will exceed 2 million t / a, which will inevitably lead to a large excess of benzene. As a cheap and easy-to-obtain excellent reagent, methanol has been extensively studied and applied in esterification, etherification, etc. However, as one of the important products of coal chemical industry, with the rapid development of coal chemical industry, the market The output of methanol will increase rapidly, and there will be a surplus. As one of the most important basic chemical raw materials, the demand for xylene has ...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C15/06C07C15/08C07C2/86
CPCY02P20/52
Inventor 徐亚荣徐新良朱学栋冯丽梅樊金龙
Owner PETROCHINA CO LTD
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