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Alkaline molecular sieve catalyst for preparation of styrene, and preparation method thereof

A molecular sieve and catalyst technology, applied in the field of basic molecular sieve catalyst for preparing styrene and its preparation, can solve the problems of poor catalytic activity and low styrene yield, achieve the effect of improving catalytic activity and solving low yield

Inactive Publication Date: 2012-03-21
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a basic molecular sieve catalyst for the preparation of styrene and a preparation method thereof, so as to solve the problems of poor catalytic activity and benzene in the side chain alkylation reaction of toluene and methanol in the existing molecular sieve catalysts. Problems such as low ethylene yield

Method used

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  • Alkaline molecular sieve catalyst for preparation of styrene, and preparation method thereof
  • Alkaline molecular sieve catalyst for preparation of styrene, and preparation method thereof
  • Alkaline molecular sieve catalyst for preparation of styrene, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Catalyst preparation

[0029] Take 100g silicon aluminum than SiO 2 / Al 2 o 3 The raw powder of IM-5 zeolite molecular sieve with a ratio of 20 is ion-exchanged with 0.03mol / L potassium nitrate solution at 80°C, and the solid-liquid ratio is 1:80 for 4 exchanges, each exchange time is 4h, After that, wash, filter with suction, and dry the filter cake at 120°C for 6 hours. Calcined at 700°C for 2 hours, then cooled in a desiccator to obtain KIM-5 molecular sieve. Shaping and crushing into 40-60 mesh particles to obtain basic molecular sieve catalyst.

[0030] 2) Reactivity test experiment

[0031] Put 0.5g of the basic molecular sieve catalyst prepared above into the reactor, the raw material ratio of toluene and methanol is 5:1 (molar ratio), and the liquid space velocity is 1h -1 , 450°C, and a nitrogen flow rate of 20ml / min, the reaction performance test was carried out, and the reaction time was 2 hours. The reaction results are listed in Table 1.

Embodiment 2

[0033] 1) Catalyst preparation

[0034] Get phosphoric acid 4.47g (6%), calcium nitrate 0.034g (0.04%), dissolve with appropriate amount of water, add the KIM-5 type molecular sieve 20g that embodiment 1 makes, stir at room temperature, place overnight, then bake at 100 DEG C Dry for 4 hours. Molecular sieves were calcined at 900°C for 4h, and then cooled in a desiccator. Shaping and crushing into 40-60 mesh particles to obtain basic molecular sieve catalyst.

[0035] 2) Reactivity test experiment

[0036] Put 8g of the basic molecular sieve catalyst prepared above into the reactor, the raw material ratio of toluene and methanol is 1:1 (molar ratio), and the liquid space velocity is 3h -1 , 370°C, and a nitrogen flow rate of 20ml / min, the reaction performance test was carried out, and the reaction time was 10 hours. The reaction results are listed in Table 1.

Embodiment 3

[0038] 1) Catalyst preparation

[0039] Take 200g silicon aluminum than SiO 2 / Al 2 o 3 The original powder of IM-5 zeolite molecular sieve with a ratio of 40 is exchanged with 0.1mol / L cesium carbonate solution for IM-5 zeolite molecular sieve at 80°C, and the solid-liquid ratio is 1:80. After 10 hours, wash, filter with suction, and dry the filter cake at 120°C for 6 hours. The molecular sieve was calcined at 400°C for 2 hours, and then cooled in a desiccator to obtain CsIM-5 molecular sieve. Shaping and crushing into 40-60 mesh particles to obtain basic molecular sieve catalyst.

[0040] 2) Reactivity test experiment

[0041] Put 10g of the basic molecular sieve catalyst prepared above into the reactor, the raw material ratio of toluene and methanol is 1:1 (molar ratio), and the liquid space velocity is 6h -1 , 400°C, and a nitrogen flow rate of 20ml / min, the reaction performance test was carried out, and the reaction time was 50h. The reaction results are listed in T...

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Abstract

The invention discloses an alkaline molecular sieve catalyst for preparation of styrene, and a preparation method thereof. The alkaline molecular sieve catalyst adopts an IM-5 molecular sieve as a carrier, and can carry at least one of compounds containing alkali metal, alkaline earth metal, B, P, Zn or Fe through an ion exchange method and an immersion method. The alkaline molecular sieve catalyst has good catalytic performances and high stability, can be utilized for side chain alkylation reaction of toluene and methanol, and solves the problems that based on the prior art, a styrene yield is low; a molecular sieve structure is easy to be destroyed; and catalyst stability is poor.

Description

technical field [0001] The invention relates to a molecular sieve catalyst and a preparation method thereof, in particular to a basic molecular sieve catalyst for preparing styrene and a preparation method thereof, in particular to a base for preparing styrene by side-chain alkylation of toluene and methanol Molecular sieve catalyst and its preparation method. Background technique [0002] Styrene is an important basic organic chemical raw material, mainly used in the production of polystyrene resin (PS), acrylonitrile-butadiene-styrene terpolymer (ABS), styrene-acrylonitrile copolymer (SAN ) resin, ion exchange resin, unsaturated polyester and styrene rubber (SBR, SBS), etc. [0003] At present, ethylbenzene is used as the raw material for the industrial production of styrene, and the main methods include ethylbenzene catalytic dehydrogenation and ethylbenzene co-oxidation co-production. Catalytic dehydrogenation of ethylbenzene is the leading technical route for the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/76C07C15/46C07C2/86
Inventor 贾明君张春雷石景慧朱万春宁春利张志会潘博唐勇王振旅闫文付张文祥张怡
Owner SHANGHAI HUAYI GRP CO
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