Toluene/methanol side chain alkylation method

A technology of alkylation and methanol, which is applied in chemical instruments and methods, organic chemistry, molecular sieve catalysts, etc., can solve the problems of poor catalyst stability and low styrene selectivity, and achieve improved stability, improved catalytic effect, and improved ionic strength. The effect of the degree of exchange

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • 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 prior art has the problems of low styrene selectivity and poor catalyst stability, and provides a new method for side chain alkylation of toluene methanol

Method used

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  • Toluene/methanol side chain alkylation method
  • Toluene/methanol side chain alkylation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take silicon aluminum than SiO 2 / Al 2 o 3 =2.2 X molecular sieve, ion exchanged with KOH solution and CsOH solution in turn, 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%. Then boric acid, diamine hydrogen phosphate and europium nitrate are formulated into a solution, and boron, phosphorus and europium are impregnated on the above-mentioned modified molecular sieve material. The content of boron in the supported catalyst is 0.5%, the content of phosphorus is 0.8%, and the content of europium is 1%.

[0028] The above-mentioned obtained catalyst tablet molding 40 ~ 60 mesh granular catalyst, put into the reactor, under normal pressure, the molar ratio of toluene to methanol is 5, in 3.0 hours -1 liquid space velocity, 415°C, N 2Activity evaluation was performed at a flow rate of 10 ml / min.

[0029] Results: The utilization rat...

Embodiment 2

[0031] Take silicon aluminum than SiO 2 / Al 2 o 3 =2.2 X molecular sieve, ion exchanged with KOH solution, RbOH solution and CsOH solution in sequence, 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%. Then boric acid, diamine hydrogen phosphate and europium nitrate are formulated into a solution, and boron, phosphorus and europium are impregnated on the above-mentioned modified molecular sieve material. The content of boron in the loaded catalyst is 0.6%, the content of phosphorus is 0.9%, and the content of europium is 1%.

[0032] The above-mentioned obtained catalyst tablet molding 40 ~ 60 mesh granular catalyst, put into the reactor, under normal pressure, the molar ratio of toluene to methanol is 5, in 3.0 hours -1 liquid space velocity, 415°C, N 2 Activity evaluation was performed at a flow rate of 10 ml / min.

[0033] Results: Th...

Embodiment 3

[0035] Take silicon aluminum than SiO 2 / Al 2 o 3 = 2.2 X molecular sieves, ion-exchange in KOH solution and CsOH solution in sequence, filter and dry 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%. Then boric acid, diammonium hydrogen phosphate and ytterbium nitrate are formulated into a solution, and the boron, phosphorus and ytterbium are impregnated on the above-mentioned modified molecular sieve material. The content of boron in the supported catalyst is 0.4%, the content of phosphorus is 0.8%, and the content of ytterbium is 1%.

[0036] The above-mentioned obtained catalyst tablet molding 40 ~ 60 mesh granular catalyst, put into the reactor, under normal pressure, the molar ratio of toluene to methanol is 5, in 3.0 hours -1 liquid space velocity, 415°C, N 2 Activity evaluation was performed at a flow rate of 10 ml / min.

[0037] Results: The utili...

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Abstract

The invention relates to a toluene / methanol side chain alkylation method and mainly aims at solving the problems of low styrene selectivity and poor stability of catalysts in the prior art. The problems are well solved by virtue of the following technical scheme: toluene and methanol are taken as raw materials; the raw materials are in contact with a catalyst and react to generate ethylbenzene and styrene under the conditions of a reaction temperature of 200-600 DEG C, a reaction pressure of 0-0.5MPa and a raw material weight space velocity of 0.5-10 h<-1>; the molar ratio of the toluene to the methanol in the raw materials is 0.1-10; the catalyst is prepared from the following components in percentage by weight: a) 93-99.8% of alkali metal ion exchange molecular sieve, b) 0.1-0.5% of rare earth element, and c) 0.1-2% of at least one of boron or phosphorus; and the toluene / methanol side chain alkylation method is applicable to the industrial production of preparing the ethylbenzene and the styrene by virtue of toluene / methanol side chain alkylation.

Description

technical field [0001] The invention relates to a method for side chain alkylation of toluene 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. Alkylation of toluene and methanol is a route with p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C15/073C07C15/46B01J29/08
CPCY02P20/52
Inventor 蒋见缪长喜张磊张新玉
Owner CHINA PETROLEUM & CHEM CORP
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