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A kind of ethanol and benzene gas-phase alkylation preparation ethylbenzene catalyst and its preparation and application

A catalyst and seed crystal technology, applied in the field of materials, can solve the problem of no public report of nano ZSM-5, and achieve the effect of good industrial application prospect, low xylene impurity content, and easy to scale up production.

Active Publication Date: 2021-03-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these patents discloses the preparation of nano ZSM-5

Method used

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  • A kind of ethanol and benzene gas-phase alkylation preparation ethylbenzene catalyst and its preparation and application
  • A kind of ethanol and benzene gas-phase alkylation preparation ethylbenzene catalyst and its preparation and application
  • A kind of ethanol and benzene gas-phase alkylation preparation ethylbenzene catalyst and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] 1) Dissolve 25.0g of ethyl tetrasilicate in 12.0g of deionized water, add 10ml of tetrapropylammonium hydroxide solution with a concentration of 3mol / L, stir at room temperature for 1h, and put it in an oil bath at 110°C for crystallization Reflux for 80 hours to obtain a ZSM-5 seed crystal gel solution.

[0129] 2) Mix 20.0g tetraethyl silicate, 0.7g sodium metaaluminate, 0.3g sodium hydroxide, and 7g water to obtain a mixed solution; add the above mixed solution to 8.0g ZSM-5 seed crystal solution, and Aging was carried out under stirring for 6 hours, and the water in the solution was evaporated to dryness by placing in a water bath at 50° C. to obtain a solid gel.

[0130] 3) Grind the solid gel into powder and transfer it to a polytetrafluoroethylene support; then add 5ml of deionized water to the hydrothermal kettle, transfer the support to the hydrothermal kettle, seal it, and place it in an oven at 130°C for crystallization. for 48 hours; after the crystallized ...

Embodiment 2

[0134] The tetraethyl orthosilicate in step 1) of Example 1 was replaced with 24.0 g of silica sol (30 wt%) with equimolar silicon content, and the rest of the synthesis conditions remained unchanged to obtain a molecular sieve catalyst, marked as 2#.

Embodiment 3

[0136] The tetrapropylammonium hydroxide solution in step 1) of Example 1 was replaced with 6.3 g of tetraethylammonium bromide in an equimolar amount, and the rest of the synthesis conditions remained unchanged to obtain a molecular sieve catalyst, marked as 3#.

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Abstract

The application discloses a preparation method of a molecular sieve catalyst, comprising: obtaining a ZSM-5 seed crystal gel solution; adding a mixture I containing silicon source, aluminum source, alkali and water to the ZSM-5 seed crystal gel In the solution, the mixture is obtained, aged, and a solid gel is obtained; under sealed conditions, the solid gel is steam-assisted crystallized, roasted, ammonium ion exchanged, and roasted to obtain a nano ZSM-5 molecular sieve; the obtained nano The ZSM‑5 molecular sieve is treated with steam, modified with phosphorus, and calcined to obtain the molecular sieve catalyst. The catalyst of the present application has the characteristics of uniform acid site distribution and high crystallinity, and the preparation process produces less waste water, which is convenient for scale-up production; the catalyst has good hydrothermal stability in the alkylation reaction of ethanol and benzene, and can be used at a lower benzene-alcohol ratio The high ethyl selectivity can still be maintained under the feed conditions, and the xylene impurity content in the product is low, so it has good industrial application prospect.

Description

technical field [0001] The application relates to a preparation method and application of a molecular sieve catalyst, belonging to the field of materials. Background technique [0002] Ethylbenzene is an important commercial derivative of benzene in the current chemical industry. It is mainly used for the dehydrogenation of styrene, and it is also an important raw material for the production of polystyrene and ABS resin. In recent years, the market demand for ethylbenzene has shown an obvious upward trend, but the depletion of petroleum resources and the soaring price of petroleum have greatly increased the cost of ethylene alkylation, and it has become a trend to seek new raw materials to replace ethylene to prepare ethylbenzene. As a renewable clean energy, ethanol can not only be produced via petroleum route, but also can be obtained from large-scale production of agricultural by-products and coal, which saves the cost from the source of ethanol production and provides mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J37/28B01J37/10C07C2/86C07C15/073
CPCB01J29/40B01J37/0018B01J37/10B01J37/28C07C2/864C07C15/073C01B39/40C07C2/86
Inventor 苏雄杨晓丽黄延强张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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