Catalyst for preparation of styrene and ethylbenzene by side chain alkylation reaction of toluene and application thereof

An alkylation reaction, styrene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low utilization rate of C1 raw materials, low toluene conversion rate, poor catalyst stability, etc. The effect of high C1 raw material utilization, high toluene conversion and high selectivity

Active Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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 existing catalysts for the production of styrene and ethylbenzene by side chain alkylation of toluene have low utilization rate of C1 raw materials, low conversion rate of toluene and poor catalyst stability. A new catalyst is provided The catalyst is used for the side-chain alkylation of toluene to produce ethylbenzene and styrene. High utilization rate of C1 raw materials, high selectivity of ethylbenzene and styrene and high stability of catalyst performance

Method used

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  • Catalyst for preparation of styrene and ethylbenzene by side chain alkylation reaction of toluene and application thereof
  • Catalyst for preparation of styrene and ethylbenzene by side chain alkylation reaction of toluene and application thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Weigh 100g silicon aluminum ratio SiO 2 / Al 2 o 3For 2.1 NaX molecular sieves, at 60°C, carry out ion exchange in 500mL of potassium nitrate aqueous solution for 2 hours, exchange twice, then at 60°C, carry out ion exchange in 500mL of cesium nitrate aqueous solution for 2 hours, exchange 2 times, exchanged, filtered, and dried in an oven at 110°C for 4 hours. Prepare 100 mL of an aqueous solution containing an appropriate amount of sodium metaaluminate, rhenium chloride, calcium nitrate, and cerium nitrate, impregnate the ion-exchanged molecular sieve in the above solution by stirring for 4 hours at 60°C, and then evaporate to dryness. Dry in an oven at 110°C for 4 hours, and then bake in a muffle furnace at 600°C for 4 hours to obtain catalyst A, which is ground into 40-60 mesh particles for catalyst evaluation. The mass ratio of the modifying elements contained in the catalyst A to the molecular sieve carrier is: Al 1%, Re 0.6%, K 2%, Cs 8%, Ca 0.8%, Ce 1%.

Embodiment 2

[0025] Weigh 100g silicon aluminum ratio SiO 2 / Al 2 o 3 For NaX molecular sieves of 2, ion exchange was carried out in 500 mL aqueous solution of potassium nitrate at 60 °C for 2 hours, exchanged twice, and then at 60 °C, ion exchange was carried out in 500 mL aqueous solution of cesium nitrate for 2 hours, exchanged 2 times, exchanged, filtered, and dried in an oven at 90°C for 24 hours. Prepare 100 mL of an aqueous solution containing an appropriate amount of sodium metaaluminate, rhenium chloride, calcium nitrate, and cerium nitrate, impregnate the ion-exchanged molecular sieve in the above solution by stirring for 4 hours at 60°C, and then evaporate to dryness. Dry in an oven at 90°C for 24 hours, and then bake in a muffle furnace at 400°C for 24 hours to obtain catalyst B, which is ground into 40-60 mesh particles for catalyst evaluation. The mass ratio of the modifying elements contained in the catalyst B to the molecular sieve carrier is: Al 1%, Re 0.6%, K 0.5%, Cs ...

Embodiment 3

[0027] Weigh 100g silicon aluminum ratio SiO 2 / Al 2 o 3 For 2.9 NaX molecular sieves, at 60°C, carry out ion exchange in 500mL of potassium nitrate aqueous solution for 2 hours, exchange twice, then at 60°C, carry out ion exchange in 500mL of cesium nitrate aqueous solution for 2 hours, exchange 2 times, exchanged, filtered, and dried in an oven at 150°C for 1 hour. Prepare 100 mL of an aqueous solution containing an appropriate amount of sodium metaaluminate, rhenium chloride, calcium nitrate, and cerium nitrate, impregnate the ion-exchanged molecular sieve in the above solution by stirring for 4 hours at 60°C, and then evaporate to dryness. Dry in an oven at 150°C for 1 hour, and then bake in a muffle furnace at 650°C for 1 hour to obtain catalyst C, which is ground into 40-60 mesh particles for catalyst evaluation. The mass ratio of the modifying elements contained in the catalyst C to the molecular sieve carrier is: Al 1%, Re 0.6%, K 10%, Cs 10%, Ca 2%, Ce 2%.

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Abstract

The present invention relates to a catalyst for preparation of styrene and ethylbenzene by a side chain alkylation reaction of toluene and application thereof, and mainly solves the problems of low utilization rate of a C1 raw material, low conversion rate of toluene and poor stability of a current catalyst used for the side chain alkylation reaction of toluene to produce ethylbenzene and styrene. According to the invention, the catalyst uses a modified X or Y molecular sieve as an active component, and at least one of group IIIA elements, at least one of VII B elements, at least one of alkali metal elements, at least one of the alkaline earth elements and at least one of lanthanide elements as modified components. A technical scheme, in which toluene and C1 raw materials contact with the catalyst to be subjected to a reaction to produce ethylbenzene and styrene, well solves the problems, and the catalyst can be used in the industrial production of preparation of ethylbenzene and styrene by the side chain alkylation reaction of toluene and methanol.

Description

technical field [0001] The invention relates to a catalyst for producing styrene and ethylbenzene by side-chain alkylation of toluene and its application. Background technique [0002] Styrene is an important organic chemical raw material, mainly used in the production of polystyrene, styrene-butadiene rubber, ABS resin, unsaturated resin, etc. It can also be used in the fields of pharmaceuticals, pesticides, and dyes. Currently, the vast majority of industrial styrene production is carried out in two steps. First, benzene and ethylene undergo a Friedel-Craft alkylation reaction under the action of a catalyst to produce ethylbenzene, and then ethylbenzene undergoes catalytic dehydrogenation to produce styrene. The raw material cost of this route is high, the process flow is long, the equipment investment is large, and the energy consumption is relatively high. The side chain alkylation of toluene is a route with potential application prospects for the production of styrene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J29/16C07C15/46C07C15/073C07C2/86
CPCY02P20/52
Inventor 曾铁强缪长喜蒋见卢媛娇张新玉
Owner CHINA PETROLEUM & CHEM CORP
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