Catalyst for catalyzing acetylene to directly prepare styrene, and preparation method and application thereof

A catalyst, styrene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low industrial profits and overcapacity of polyvinyl chloride, achieve short process routes, widen production capacity, The effect of obvious technical advantages

Active Publication Date: 2020-01-03
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main downstream product of acetylene, polyvinyl chloride (PVC), has a serious overcapacity and low industrial profits. It is urgent to expand the industrial chain of downstream products of acetylene.
However, there are no related studies and reports

Method used

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  • Catalyst for catalyzing acetylene to directly prepare styrene, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Catalyst preparation

[0045] Catalyst component silicon / ZSM-5 molecular sieve mass ratio = 5:95. Select a molecular sieve with a silicon-aluminum ratio of 150 for thermal activation roasting treatment, the roasting temperature is 500 ° C, and the roasting time is 8 hours; then weigh 3.71 g of tetraethyl orthosilicate, and 9.5 g of the activated molecular sieve; drop ethyl orthosilicate Add 11.4mL of n-hexane and stir to form a uniform precursor solution; drop the precursor solution into molecular sieves for impregnation, and perform ultrasonic treatment for 2 hours after the addition; after ultrasonic treatment, heat and evaporate to remove the dispersant, heating temperature 100 ° C, The evaporation time is 2 hours; finally, roasting is carried out at a roasting temperature of 350° C. and a roasting time of 5 hours to obtain a finished catalyst, which is granulated and sieved to 40-60 meshes for later use.

[0046] (2) Catalyst evaluation

[0047] A fixed-bed mi...

Embodiment 2

[0049] (1) Catalyst preparation

[0050] Catalyst component silicon / ZSM-5 molecular sieve mass ratio = 3:97. Select a molecular sieve with a silicon-aluminum ratio of 150 for thermal activation roasting treatment, the roasting temperature is 600°C, and the roasting time is 6 hours; then weigh 2.22 g of tetraethyl orthosilicate, and 9.7 g of the activated molecular sieve; drop ethyl orthosilicate Add 10.7mL of ethanol and stir to form a uniform precursor solution; drop the precursor solution into molecular sieves for impregnation, and perform ultrasonic treatment for 1 hour after the addition; after ultrasonic treatment, heat and evaporate to remove the dispersant. The time is 3 hours; finally, roasting is carried out at a roasting temperature of 300°C and a roasting time of 4 hours to obtain the finished catalyst, which is granulated and screened to 40-60 meshes for later use.

[0051] (2) Catalyst evaluation, with embodiment 1 evaluation condition, evaluation result sees tab...

Embodiment 3

[0053] (1) Catalyst preparation

[0054] Catalyst component silicon / ZSM-5 molecular sieve mass ratio=4:96. Select a molecular sieve with a silicon-aluminum ratio of 150 for thermal activation roasting treatment, the roasting temperature is 550 ° C, and the roasting time is 7 hours; then weigh 2.97 g of tetraethyl orthosilicate, and 9.6 g of activated molecular sieve; add ethyl orthosilicate dropwise Stir in 11mL of n-hexane to form a uniform precursor solution; drop the precursor solution into molecular sieves for impregnation, and perform ultrasonic treatment for 3 hours after the addition; after ultrasonic treatment, heat and evaporate to remove the dispersant, heating temperature 90°C, evaporate The time is 2 hours; finally, calcination is carried out, the calcination temperature is 350°C, and the calcination time is 4 hours to obtain the finished catalyst, which is granulated and sieved to 40-60 meshes for later use.

[0055] (2) Catalyst evaluation, with embodiment 1 eva...

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Abstract

The invention relates to the technical field of catalysts, and particularly discloses a catalyst for catalyzing acetylene to directly prepare styrene, and a preparation method and an application thereof. The catalyst is a silicon-aluminum molecular sieve modified and passivated with silicon, and comprises a B acid site and an L acid-base site, the B acid is proton hydrogen, the L acid is non-framework aluminum or a metal cation for balancing charges, and oxygen adjacent to the L acid site is used as an L base site. The catalyst improves the selectivity of the styrene product, inhibits the generation of ortho-position and meta-position alkylbenzene or macromolecular byproducts, reduces alkyne cracking, polymerization and other side reactions and the generation of deposited carbon, and fullyutilizes the shape-selective catalytic effect of the inner surfaces of pores to prepare the target product styrene. A traditional styrene process technical route is broken through, and downstream products of coal-based acetylene are broadened; and compared with the traditional styrene process technical route, a method for directly reacting acetylene with benzene under the action of the catalyst to synthesize styrene has the obvious technical advantages of mild reaction conditions, short process route and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for directly preparing styrene by catalyzing acetylene, a preparation method and application thereof. Background technique [0002] As an important basic chemical raw material, styrene is mainly used for synthetic rubber and resin, and its downstream products mainly include styrene-butadiene rubber, polystyrene resin, ABS engineering plastics and other products, which are widely used in industrial applications and have high demand. At present, styrene basically comes from petrochemical technology, and nearly 90% of its production capacity is mainly through ethylbenzene dehydrogenation technology. The process route is first to produce ethylbenzene through benzene and ethylene, and then to produce styrene through dehydrogenation of ethylbenzene. The process route is long and dehydrogenation The hydrogen process is generally a negative pressure adiabatic reaction, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C2/38C07C15/46
CPCB01J29/40C07C2/38C07C15/46Y02P20/584
Inventor 杜波马明水秦丽珍
Owner ENN SCI & TECH DEV
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