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Bifunctional catalyst, preparation method thereof, and method for preparing styrene from toluene and methanol

A dual-function catalyst and catalyst technology, applied in the field of catalysis, can solve problems such as low selectivity and low conversion rate, and achieve the effects of increasing yield, solving low conversion rate, and improving toluene conversion rate

Active Publication Date: 2019-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to one aspect of the present invention, a kind of bifunctional catalyst and preparation method thereof are provided, and the catalyst improves the yield of styrene while improving the conversion rate of toluene and the utilization rate of methanol; Problems of low conversion and low selectivity in the chemical preparation of styrene

Method used

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  • Bifunctional catalyst, preparation method thereof, and method for preparing styrene from toluene and methanol
  • Bifunctional catalyst, preparation method thereof, and method for preparing styrene from toluene and methanol
  • Bifunctional catalyst, preparation method thereof, and method for preparing styrene from toluene and methanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: the preparation of basic molecular sieve

[0063] The molecular sieves used in the examples were purchased commercially.

[0064] Preparation of X molecular sieve and Y molecular sieve modified by alkali metal ions:

[0065] Take 20g of NaX or NaY molecular sieve, and use 0.2-0.6mol / L potassium nitrate, rubidium nitrate, cesium nitrate and other precursor solutions to ion-exchange the molecular sieve respectively. When the solid-liquid ratio is 10:1, exchange at 80°C for 4 hours, and filter , washed and dried, the solid obtained was calcined in a muffle furnace at 550°C for 6 hours, and then the process was repeated twice to obtain X molecular sieves and Y molecular sieves modified by alkali metal ions, and the samples were respectively numbered Q-1 # ~Q-10 # .

[0066] The obtained sample number, precursor solution type and concentration, and exchange degree are shown in Table 1. Adopt XRF elemental analyzer (Axios 2.4KW type of PANAbalytical company)...

Embodiment 2

[0070] Embodiment 2: the preparation of the Silicate-1 molecular sieve of ion exchange

[0071] In the metal ion-exchanged Silicate-1 molecular sieve, the metal ion is at least one selected from potassium ions, copper ions, cerium ions, manganese ions, magnesium ions, molybdenum ions, zinc ions, and cesium ions.

[0072] Take 5g of Silicate-1 molecular sieve, and use 0.1~0.5mol / L metal nitrate or / and chloride as the precursor solution to ion-exchange the molecular sieve respectively. After filtration, washing and drying, the obtained solid was calcined in a muffle furnace at 550°C for 6 hours, and then the process was repeated twice to obtain a metal ion-exchanged Silicate-1 molecular sieve, and the obtained sample number was A-1 # ~A-17 # .

[0073] The obtained sample number, precursor solution type, precursor solution concentration and mixing ratio are shown in Table 2.

[0074] Table 2

[0075] Sample serial number

Embodiment 3

[0076] Embodiment 3: preparation of bifunctional catalyst

[0077] The basic molecular sieve Q-1 prepared by embodiment 1 # ~Q-6 # The Silicate-1 molecular sieve A-1 of at least one in and the metal ion exchange that embodiment 2 obtains # ~A-17 # At least one of them is mixed, shaped, crushed, and sieved to 20-40 meshes, and the obtained bifunctional catalyst is numbered D-1 # ~D-30 # . where D-1 # ~D-15 # The Silicate-1 molecular sieve that is basic molecular sieve and metal ion exchange is ball-milled on the ball mill for 10h (D-1 # ~D-5 # ), 15h (D-6 # ~D-10 # ), 20h (D-11 # ~D-15 # ), after mixing evenly, then molding; D-16 # ~D-30 # After the basic molecular sieve and the Silicate-1 molecular sieve of metal ion exchange are mixed evenly, ball mill on a ball mill for 10h (D-16 # ~D-20 # ), 15h (D-21 # ~D-25 # ), 20h (D-25 # ~D-30 # ) for molding.

[0078] Table 3 shows the relationship between the number of the obtained bifunctional catalyst and the t...

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Abstract

The invention discloses a bifunctional catalyst, a preparation method thereof, and a method for preparing styrene from toluene and methanol. The bifunctional catalyst comprises an alkaline molecular sieve and a Silicate-1 molecular sieve for metal ion exchange, and the preparation method is simple. When the bifunctional catalyst provided by the invention is applied to an side-chain alkylation reaction process of toluene and methanol, the toluene conversion rate, the methanol utilization rate and the styrene yield are effectively improved.

Description

technical field [0001] The invention relates to a bifunctional catalyst and a preparation method thereof, and a method for preparing styrene from toluene and methanol, belonging to the field of catalysis. Background technique [0002] Styrene (ST) is an important organic chemical raw material, mainly used in the production of polystyrene (PS), acrylonitrile-butadiene resin (ABS), expanded polystyrene (EPS), styrene-butadiene Diene rubber (SBR), etc. At present, the traditional styrene production technology in industry is ethylbenzene dehydrogenation method, mainly through Friedel-Craft reaction, catalytic dehydrogenation reaction, and finally styrene is obtained. This method has long process route, large equipment investment, many side reactions, A series of problems such as high energy consumption and excessive dependence on oil resources. Therefore, the new styrene production process has received widespread attention. [0003] In 1967, Japanese researcher Sidorenko et a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J29/14B01J29/16B01J29/46B01J29/48B01J37/04B01J37/30C07C2/86C07C15/46
CPCY02P20/52
Inventor 许磊韩乔徐力李沛东袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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