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A method for preparing styrene by the coupling reaction of methanol anaerobic dehydrogenation and toluene side chain alkylation

A coupling reaction and alkylation technology, applied in the field of catalysis, can solve problems such as low selectivity and low conversion rate, and achieve the effects of improving yield, solving low conversion rate and improving methanol utilization rate

Active Publication Date: 2021-03-30
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 method for preparing styrene by the coupling reaction of anaerobic dehydrogenation of methanol and side chain alkylation of toluene is provided, which can effectively improve the conversion rate of toluene and the utilization rate of methanol, and simultaneously increase the yield of styrene; Solve the problem of low conversion rate and low selectivity in the preparation of styrene by side chain alkylation of toluene and methanol

Method used

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  • A method for preparing styrene by the coupling reaction of methanol anaerobic dehydrogenation and toluene side chain alkylation
  • A method for preparing styrene by the coupling reaction of methanol anaerobic dehydrogenation and toluene side chain alkylation
  • A method for preparing styrene by the coupling reaction of methanol anaerobic dehydrogenation and toluene side chain alkylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1: Preparation of alkaline molecular sieves

[0072] The molecular sieves employed in the examples come from commercial purchase.

[0073] Preparation of Alkali Metal Ion Modified X, Y - type molecular sieve:

[0074] Take 20 g of Nax or NAY molecular sieves, with a precursor solution of 0.2 to 0.6 mol / L, nitrate, nitrate, cesium nitrate, and cesium nitrate, the solid-liquid ratio is 10: 1, at 80 ° C for 4 h, filtration , Washing, after drying, the solid obtained was taken at 550 ° C in the muffle furnace and then repeated twice, resulting in an alkali-type X-type, Y-type molecular sieve, and the sample is numbered H-1, respectively. # ~ H-6 # .

[0075] The resulting sample number, the type and concentration of precursor solution and ion exchange are as shown in Table 1. The sample was analyzed by an XRF element analyzer (Panabalytic AXIOS 2.4KW), and the ion exchange rate was calculated according to the sodium content of the sample before and after exchange, and...

Embodiment 2

[0079] Example 2: Preparation of dehydrogenation catalyst

[0080] Preparation of alkali metal refractory salts: alkali metal refractory salts are selected from at least one from sodium carbonate, sodium boricate, sodium molybdate, sodium aluminate. The alkali metal is milled, and then dried at 110 ° C, 550 ° C for 6 h. Get alkali metal is difficult to melt salt, sample number is DE-1 # ~ DE-6 # .

[0081] The obtained sample number, the alkali metal is difficult to melt salt, and the mixing ratio is shown in Table 2. The mixing ratio is calculated according to the quality of the alkali metal.

[0082] Sample serial number Alkali metal is difficult to melt salt The mixing ratio DE-1 #

Sodium carbonate -- DE-2 #

Sodium borate -- DE-3 #

Sodium molybdate -- DE-4 #

Sodium carbonate + sodium borate 1:2 DE-5 #

Sodium carbonate + sodium molybdate 1:1 DE-6 #

Sodium carbonate + sodium borate 2:1

[0083] Lo...

Embodiment 3

[0097] Example 3: Preparation of dual function catalysts

[0098] Alkaline molecular sieve H-1 prepared in Example 1 # ~ H-6 # At least one of at least one and the dehydrogenation catalyst DE-1 obtained in Example 2 # ~ DE-24 # At least one mixed, molded, and sieved to 20 to 40 mesh, the obtained dual function catalyst number CAT-1 # ~ CAT-40 # . Where CAT-1 # ~ CAT-20 # For alkaline molecular sieves and dehydrogenation catalysts on ball mills on ball milling 10 h (CAT-1 # ~ CAT-5 # ), 15h (CAT-6 # ~ CAT-15 # ), 20h (CAT-16 # ~ CAT-20 # ), After mixing is uniform, molding; CAT-21 # ~ CAT-40 #After mixing the alkaline molecular sieve and the dehydrogenation catalyst, the ball mill is ground on the ball mill (CAT-21) # ~ CAT-25 # ), 15h (CAT-26 # ~ CAT-35 # ), 20h (CAT-36 # ~ CAT-40 # ).

[0099] The relationship between the obtained double-functional catalyst number and the species of the alkaline molecular sieve and the dehydrogenation catalyst, as shown in Table 5.

[0100] table...

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Abstract

The invention discloses a method for preparing styrene through the coupling reaction of methanol anaerobic dehydrogenation and toluene side chain alkylation; An oxygen-free dehydrogenation reaction occurs to generate formaldehyde, and the obtained formaldehyde and toluene undergo a side-chain alkylation reaction to generate styrene. The method can increase the conversion rate of toluene, the utilization rate of methanol and the yield of styrene through the mutual coupling of two reactions.

Description

Technical field [0001] The present invention relates to a method of methanol oxygen-free dehydrogenation and a toluene sideways, which is a catalytic field. Background technique [0002] Styrene as an important monomer of polymers, mainly used to produce polystyrene (PS), acrylonitrile-butadiene resin (ABS), foam-free polystyrene (EPS), styrene-butadiene rubber ( SBR) and other chemical products. The conventional styrene production technology is the ethylbenzene dehydrogenation method, mainly passing the Friedel-Craft reaction, catalytic dehydrogenation reaction to the objective product styrene, the process is long, the equipment investment is large, the side reactors, high energy consumption, high energy consumption, high energy consumption, high energy consumption, high energy consumption, high energy consumption, high energy consumption, high energy consumption, high energy consumption, Over-relying on a series of issues such as oil resources. Therefore, the new styrene produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C2/86B01J29/08B01J29/16B01J29/14B01J29/12B01J29/80B01J37/30B01J37/08B01J37/03B01J37/02
Inventor 许磊韩乔李沛东徐力袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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