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Method for preparing ethylbenzene and styrene through toluene and methanol side chain alkylation

A technology of alkylation and styrene, which is applied in the field of side-chain alkylation of toluene and methanol to produce ethylbenzene and styrene, which can solve the problems of unstable catalyst, low selectivity of ethylbenzene and styrene, and low conversion rate of toluene. To achieve the effect of improving catalytic effect, increasing ion exchange degree and improving stability

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the prior art has low conversion rate of toluene, low selectivity of ethylbenzene and styrene, problem of unstable catalyst, and provides a new side chain alkylation of toluene and methanol to produce ethylbenzene and styrene Methods

Method used

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  • Method for preparing ethylbenzene and styrene through toluene and methanol side chain alkylation
  • Method for preparing ethylbenzene and styrene through toluene and methanol side chain alkylation
  • Method for preparing ethylbenzene and styrene through toluene and methanol side chain alkylation

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Effect test

Embodiment 1

[0032] Take silicon aluminum than SiO 2 / Al 2 o 3 = 2.2 x molecular sieve and SiAl ratio SiO 2 / Al 2 o3 =25 of the ZSM-5 molecular sieve with KNO 3 The solution was ion-exchanged, filtered and dried at 100°C for 10 hours. After the exchange, the ion exchange degree of the sodium ion in the alkali metal ion exchange molecular sieve in the catalyst is more than 85%. After ion exchange, cerium nitrate was used as the rare earth source, and the rare earth cerium was loaded on the two molecular sieves by impregnation method, and the rare earth content was 1%. The dried modified X molecular sieve and modified ZSM-5 molecular sieve were mechanically mixed according to a weight ratio of 1:1, and calcined at 500° C. for 4 hours.

[0033] Press the catalyst obtained above to form a 40-60-mesh granular catalyst, put it into the reactor, and put it under normal pressure with a molar ratio of toluene to methanol of 3:1 for 3.0 hours -1 liquid space velocity, 415°C, N 2 The activity...

Embodiment 2

[0035] Take silicon aluminum than SiO 2 / Al 2 o 3 = 2.2 x molecular sieve and SiAl ratio SiO 2 / Al 2 o 3 =25 ZSM-5 molecular sieves were ion-exchanged with RbCl solution, filtered and dried at 100°C for 10 hours. After the exchange, the ion exchange degree of the sodium ion in the alkali metal ion exchange molecular sieve in the catalyst is more than 85%. After ion exchange, lanthanum nitrate was used as the rare earth source, and the rare earth lanthanum was loaded on the two molecular sieves by impregnation method, and the rare earth content was 1%. The dried modified X molecular sieve and modified ZSM-5 molecular sieve were mechanically mixed according to a weight ratio of 1:1, and calcined at 500° C. for 4 hours.

[0036] Press the catalyst obtained above to form a 40-60-mesh granular catalyst, put it into the reactor, and put it under normal pressure with a molar ratio of toluene to methanol of 3:1 for 3.0 hours -1 liquid space velocity, 415°C, N 2 The activity ev...

Embodiment 3

[0038] Take silicon aluminum than SiO 2 / Al 2 o 3 = 2.2 x molecular sieve and SiAl ratio SiO 2 / Al 2 o 3 =25 of the ZSM-5 molecular sieve with CsNO 3 The solution was ion-exchanged, filtered and dried at 100°C for 10 hours. After the exchange, the ion exchange degree of the sodium ion in the alkali metal ion exchange molecular sieve in the catalyst is more than 85%. After ion exchange, europium nitrate was used as the rare earth source, and the rare earth europium was loaded on the two molecular sieves by impregnation method, and the rare earth content was 1%. The dried modified X molecular sieve and modified ZSM-5 molecular sieve were mechanically mixed according to a weight ratio of 1:1, and calcined at 500° C. for 4 hours.

[0039] Press the catalyst obtained above to form a 40-60-mesh granular catalyst, put it into the reactor, and put it under normal pressure with a molar ratio of toluene to methanol of 3:1 for 3.0 hours -1 liquid space velocity, 415°C, N 2 The a...

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Abstract

The invention relates to a method for preparing ethylbenzene and styrene through toluene and methanol side chain alkylation, and is used for mainly solving the problems that the toluene conversion rate is low, the ethylbenzene and styrene selectivity is low and a catalyst is unstable in the prior art. The problems are solved by adopting the technical scheme that under conditions of toluene and methanol side chain alkylation, raw materials and a catalyst make contact to generate ethylbenzene and styrene; and the catalyst comprises the following components by the weight percentage: a) 0.1-99% of an alkali metal ion exchanged X molecular sieve, b) 0.1-99% of an alkali metal ion exchanged ZSM-5 molecular sieve, and c) 0-5% of a rare earth metal, wherein alkali metals are at least two selected from potassium, rubidium or cesium. The method can be used for industrial production of preparation of ethylbenzene and styrene through toluene and methanol side chain alkylation reaction.

Description

technical field [0001] The invention relates to a method for preparing ethylbenzene and styrene by side-chain alkylation of toluene and methanol. Background technique [0002] Styrene monomer is an important organic chemical raw material, mainly used in the production of polystyrene, ABS resin, styrene-butadiene rubber, unsaturated resin and other products. In addition, it can also be used in pharmaceuticals, dyes, or preparation of pesticide emulsifiers and mineral dressing agents, etc., and has a wide range of uses. The output of styrene series resins ranks third in synthetic resins after PE and PVC. At present, most industrial styrene is obtained by Friedel-Craft reaction of benzene and ethylene to form ethylbenzene, followed by catalytic dehydrogenation. This method has a long process, many side reactions, and high energy consumption. The cost of raw materials accounts for 85% of the variable cost of production, and the production cost is relatively high. [0003] Alk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C15/073C07C15/46B01J29/80
Inventor 蒋见缪长喜张磊张新玉
Owner CHINA PETROLEUM & CHEM CORP
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