Toluene Methanol Side Chain Alkylation Method

A technology of alkylation and methanol, applied in chemical instruments and methods, organic chemistry, molecular sieve catalysts, etc., can solve the problems of rapid catalyst deactivation and poor stability, and achieve the effect of improving catalytic effect and ion exchange degree

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the prior art has the problems of fast catalyst deactivation and poor stability, and a new method for side chain alkylation of toluene methanol is provided

Method used

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  • Toluene Methanol Side Chain Alkylation Method
  • Toluene Methanol Side Chain Alkylation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take silicon aluminum than SiO 2 / Al 2 o 3 =2.19 NaX molecular sieve 10 grams, under 80 ℃, carry out ion exchange in the potassium nitrate solution of 100 milliliters 1 mol / liter for 2 hours, exchange 3 times. Then carry out ion exchange in 50 ml of 1 mol / L cesium nitrate solution, exchange 3 times, filter and dry at 100° C. for 10 hours. Using europium nitrate as a precursor, metal europium is loaded on the modified molecular sieve obtained above by impregnation method to obtain a catalyst Eu / KCsX containing 1% europium.

[0024] The catalyst obtained above is pressed into pellets of 40 to 60 meshes, put into a reactor, and placed in a reactor at normal pressure with a molar ratio of toluene to methanol of 5 and 2.5 hours. -1 liquid space velocity, 415°C, N 2 The activity evaluation is carried out under the condition that the flow rate is 10 ml / min, and the methanol utilization can be kept at 31% after continuous reaction for 200 hours, and the total selectivity of...

Embodiment 2

[0026] Same as [Example 1], only the exchange order of potassium and cesium is changed. At 80° C., ion exchange was carried out in 100 ml of 1 mol / L cesium nitrate solution for 2 hours and exchanged 3 times. Then carry out ion exchange in 50 ml of 1 mol / L potassium nitrate solution, exchange 3 times, filter and dry at 100° C. for 10 hours. Using europium nitrate as a precursor, metal europium is loaded on the modified molecular sieve obtained above by impregnation method to obtain a catalyst Eu / CsKX containing 1% europium.

[0027] After continuous reaction for 200 hours, the utilization rate of methanol can be kept at 28%, and the total selectivity of ethyl styrene and styrene is 97%.

Embodiment 3

[0029] Take silicon aluminum than SiO 2 / Al 2 o 3=2.19 NaX molecular sieve 10 grams, under 80 ℃, carry out ion exchange in the potassium nitrate solution of 100 milliliters 1 mol / liter for 2 hours, exchange 3 times. Then carry out ion exchange in 50 ml of 1 mol / L cesium nitrate solution, exchange 3 times, filter and dry at 100° C. for 10 hours. Using gadolinium nitrate as a precursor, metal gadolinium is loaded onto the modified molecular sieve obtained above by an impregnation method to obtain a catalyst Gd / KCsX containing 1% gadolinium.

[0030] 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 2.5 hours -1 liquid space velocity, 415°C, N 2 The activity evaluation is carried out under the condition that the flow rate is 10 ml / min, and the methanol utilization can be kept at 31% after continuous reaction for 200 hours, and the total selectivity o...

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Abstract

The invention relates to a side-chain alkylation method of toluene methanol, which mainly solves the problems of rapid catalyst deactivation and poor stability in the prior art. The present invention uses toluene and methanol as raw materials, under the condition that the reaction temperature is 200-600°C, the reaction pressure is 0-0.5 MPa, and the weight space velocity of the raw materials is 0.5-10 hours-1, the raw materials are contacted with the catalyst, and the reaction produces Ethylbenzene and styrene; the molar ratio of toluene to methanol in the raw material is 0.1-10; the catalyst includes the following components in weight percentage: a) 98-99.5% alkali metal ion-exchanged X molecular sieve; b) 0.5- The technical solution of 2% rare earth elements solves this problem well, and can be used in the industrial production of ethylbenzene and styrene by side-chain alkylation of toluene and methanol.

Description

technical field [0001] The invention relates to a side chain alkylation method 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 potenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C15/46C07C2/88B01J29/08
CPCY02P20/52
Inventor 蒋见缪长喜张磊张新玉
Owner CHINA PETROLEUM & CHEM CORP
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