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Catalyst for preparing ethylstyrene styrene by side chain alkylation of toluene and methanol and its application

A catalyst and styrene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry, etc., can solve the problems of low activity and low selectivity of ethyl styrene and styrene, and achieve the goal of improving catalytic activity and methanol utilization Effect

Active Publication Date: 2019-10-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention aims to solve is the problem of low methanol side chain alkylation catalyst activity and low selectivity of ethylstyrene and styrene in the prior art, and provides a new method for the synthesis of ethylbenzene and ethylbenzene and The catalyst of styrene, and this catalyst is used in the reaction that catalyzes the side chain alkylation of toluene methanol to generate ethyl styrene

Method used

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  • Catalyst for preparing ethylstyrene styrene by side chain alkylation of toluene and methanol and its application
  • Catalyst for preparing ethylstyrene styrene by side chain alkylation of toluene and methanol and its application
  • Catalyst for preparing ethylstyrene styrene by side chain alkylation of toluene and methanol and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take silicon aluminum than SiO 2 / Al 2 o 3 = NaX molecular sieve of 2.19, with KNO 3 solution, RbNO 3 solution and CsNO 3 The solution was ion-exchanged in turn, filtered and then 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 above 85%. Then ferric nitrate is made into a solution, and the iron is impregnated on the above-mentioned modified molecular sieve material. The content of catalyst iron after loading is 0.8%.

[0032] The catalyst obtained above is pressed into pellets of 40 to 60 meshes, and loaded into a reactor, at normal pressure, the molar ratio of toluene to methanol is 6, in 2.0 hours -1 Liquid space velocity, 425°C, N 2 Activity evaluation was performed at a flow rate of 10 ml / min. The results are shown in Table 1.

Embodiment 2

[0034] Take silicon aluminum than SiO 2 / Al 2 o 3 = NaX molecular sieve of 2.19, with KNO 3 solution, RbNO 3 solution and CsNO 3 The solution was ion-exchanged in turn, filtered and then 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 above 85%. Then cobalt nitrate is made into a solution, and the cobalt is impregnated on the above-mentioned modified molecular sieve material. The cobalt content of the supported catalyst is 0.9%.

[0035] The catalyst obtained above is pressed into pellets of 40 to 60 meshes, and loaded into a reactor, at normal pressure, the molar ratio of toluene to methanol is 6, in 2.0 hours -1 Liquid space velocity, 425°C, N 2 Activity evaluation was performed at a flow rate of 10 ml / min.

[0036] The results are shown in Table 1.

Embodiment 3

[0038] Take silicon aluminum than SiO 2 / Al 2 o 3 = NaX molecular sieve of 2.19, with KNO 3 solution, RbNO 3 solution and CsNO 3 The solution was ion-exchanged in turn, filtered and then 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 above 85%. Then make a solution of chromium nitrate, and impregnate the chromium on the above-mentioned modified molecular sieve material. The chromium content of the supported catalyst is 1%.

[0039] The catalyst obtained above is pressed into pellets of 40 to 60 meshes, and loaded into a reactor, at normal pressure, the molar ratio of toluene to methanol is 6, in 2.0 hours -1 Liquid space velocity, 425°C, N 2 Activity evaluation was performed at a flow rate of 10 ml / min.

[0040] The results are shown in Table 1.

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Abstract

The invention relates a catalyst for preparing ethylbenzene and styrene through toluene and methanol side chain alkylation. The catalyst solves the problem that the existing catalyst for toluene and methanol side chain alkylation has a low methanol use rate and low ethylbenzene and styrene selectivity. Under toluene and methanol side chain alkylation conditions, raw materials contacts with the catalyst and undergoes a reaction to produce ethylbenzene and styrene. The catalyst is an X molecular sieve having a molar ratio of SiO2 / Al2O3 of 2 to 3. Before use, an X molecular sieve is subjected to ion exchange with at least two of potassium ions, rubidium ions and cesium ions, and then the molecular sieve catalyst is loaded with one or more of iron, cobalt, chromium, zirconium and bismuth by an impregnation method. The catalyst well solves the existing problem and can be used for the industrial production of ethylbenzene and styrene through toluene and methanol side chain alkylation.

Description

technical field [0001] The invention relates to a molecular sieve catalyst for preparing ethylbenzene and styrene and its application, in particular to a molecular sieve catalyst for preparing ethylstyrene and styrene by side chain alkylation of toluene and methanol and its application. 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 long flow process, many side reactions, high energy consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/14B01J29/16B01J29/08C07C2/86C07C15/073C07C2/88C07C15/46
Inventor 蒋见缪长喜孙清卢媛娇
Owner CHINA PETROLEUM & CHEM CORP
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