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Method for preparing styrene catalyst through toluene-methanol side chain alkylation

A catalyst and alkylation technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of easy destruction of catalyst structure, poor stability of catalyst, etc. Enhance the effect of alkalinity

Active Publication Date: 2010-01-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the structure of the catalyst in the prior art is easily destroyed and the stability of the catalyst is poor, and a new method for preparing a styrene catalyst by side-chain alkylation of toluene and methanol is provided

Method used

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  • Method for preparing styrene catalyst through toluene-methanol side chain alkylation
  • Method for preparing styrene catalyst through toluene-methanol side chain alkylation
  • Method for preparing styrene catalyst through toluene-methanol side chain alkylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 30 grams of silicon-aluminum molar ratio SiO 2 / Al 2 o 3 2 X-type zeolite molecular sieve raw powder at 90 ° C with 300 ml, 0.1 mol / L NH 4 NO 3 Exchange to NH 4 Type zeolite is then calcined at 550°C to form H-type zeolite molecular sieve. Then use 0.5 mol / L potassium nitrate as the exchange liquid to exchange the HX type zeolite molecular sieve. Exchange at 90°C for 3 times according to the solid-to-liquid ratio of 10, and each exchange time is 2 hours. Afterwards, washing, suction filtration, and drying of the filter cake at 110° C. for 4 hours. The molecular sieve was calcined at 550°C for 4 hours, and then cooled in a desiccator to obtain a KX molecular sieve. Shaping and crushing into 20-40 mesh granules to obtain the finished catalyst.

[0021] 5.0 grams of the above-mentioned finished catalyst are loaded into the reactor, and the pressure is 0.4MPa, the toluene-methanol raw material ratio is 5:1 (molar ratio), and the liquid space velocity is 1.0 h...

Embodiment 2

[0023] Take 0.49 g of boric acid and 0.73 g of cesium nitrate, dissolve them with an appropriate amount of water, add 10 g of the KX molecular sieve prepared in Example 1, stir into mud, leave overnight at room temperature, and then dry at 120° C. for 3 hours. Molecular sieves were calcined at 600°C for 4 hours, then cooled in a desiccator, shaped and crushed into 20-60 mesh particles to obtain the finished catalyst.

[0024] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

Embodiment 3

[0026] Take 1.02 grams of phosphoric acid and 0.56 grams of potassium hydroxide, dissolve them with an appropriate amount of water, add 10 grams of the KX molecular sieve prepared in Example 1, stir to form a mud, place it at room temperature for impregnation, and then dry it at 90 ° C for 6 hours. Molecular sieves were calcined at 750°C for 4 hours, then cooled in a desiccator, shaped and crushed into 20-40 mesh particles to obtain the finished catalyst.

[0027] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

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Abstract

The invention relates to a method for preparing a styrene catalyst through toluene-methanol side chain alkylation, which mainly solves the problem that in the prior art, a catalyst has a vulnerable catalyst structure and poor catalyst stability. Through the technical scheme that an alkali molecular carrier is loaded with elements selected from B, P and at least one of alkali metal and alkaline-earth metal to prepare the catalyst, wherein the carrier is exchanged into an H-type molecular sieve by ammonium salt before loading, roasted, exchanged by alkali metal salt, dried, roasted and dipped with the loaded elements, the method well solves the problem of poor stability and can be used for industrial preparation of the styrene catalyst through toluene-methanol side chain alkylation.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for side chain alkylation of toluene and methanol to prepare styrene. Background technique [0002] Styrene monomer (SM) is the simplest but most important species in the series of unsaturated aromatic hydrocarbon monomers. It is an important raw material for synthetic rubber and plastic industries. At present, the industrial SM production methods all use ethylbenzene as the raw material, including ethylbenzene catalytic dehydrogenation method and ethylbenzene co-oxidation co-production SM / PO method. Catalytic dehydrogenation of ethylbenzene is the dominant technical route for the production of styrene, but the process is long and the cost of raw materials accounts for 85% of the variable cost of SM production, resulting in high production costs. The joint production method is greatly affected by the joint product market conditions, and the reaction is complex, with many by-products and large...

Claims

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Application Information

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IPC IPC(8): B01J29/08C07C15/46C07C2/86
Inventor 危春玲杨为民缪长喜宋磊陈铜倪军平
Owner CHINA PETROLEUM & CHEM CORP
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