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Alpha-phenethyl alcohol dehydration catalyst and preparation method thereof

The technology of dehydration catalyst and phenethyl alcohol is applied in the directions of catalysts, carbon compound catalysts, chemical instruments and methods, etc. It can solve the problems affecting the long-term operation of the device, the catalyst is easy to deposit carbon, the catalyst is pulverized, and the like, and the preparation method is simple and feasible. The effect of good activity stability and prolonged service life

Pending Publication Date: 2021-03-09
SHANDONG QILU HUAXIN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction conversion rate and styrene selectivity of the gas-phase dehydration method are high, but the surface of the catalyst is prone to carbon deposition, and frequent regeneration is required; moreover, since the gas-phase dehydration process requires the use of water vapor as a diluent, the catalyst is pulverized, which seriously affects the long-term operation of the device

Method used

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  • Alpha-phenethyl alcohol dehydration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An α-phenylethanol dehydration catalyst is prepared according to the following preparation method: Weigh 123g of pseudo-boehmite by carbonization method, add 0.5g of sodium carbonate, 3g of turnip powder, and 2g of kaolin, mix well, add Al2O3 with a content of 20% 40g of aluminum sol, stirring and kneading evenly; choose a five-leaf clover orifice plate with an outer diameter of 5.0mm, extrude five-leaf clover strips, and then use a shaping machine to shape the particles to keep the particle length between 3 and 8mm.

[0029] After shaping, the particles were hardened at 45°C for 24 hours, then transferred to an oven, dried at 120°C for 4 hours, and then calcined at 950°C for 4 hours in a high-temperature furnace to obtain the catalyst, code number CAT-1.

Embodiment 2

[0031] An α-phenylethanol dehydration catalyst is prepared according to the following preparation method: Weigh 130 g of pseudo-boehmite of aluminum alcohol method, add 1.8 g of sodium bicarbonate, 2 g of scallop powder, and 3 g of white clay, mix evenly, and add a concentration of 3% 35g of aqueous nitric acid solution, stirring and kneading evenly; select a four-leaf clover orifice plate with a diameter of 3.2mm×4.0mm to extrude four-leaf clover strips, and then use a shaping machine to shape the particles to keep the particle length between 3 and 8mm.

[0032] After shaping, the particles were hardened at 60°C for 24 hours, then transferred to an oven, dried at 120°C for 4 hours, and then calcined at 1050°C for 4 hours in a high-temperature furnace to obtain the catalyst, code number CAT-2.

Embodiment 3

[0034] An α-phenylethanol dehydration catalyst is prepared according to the following preparation method: Weigh 110 g of double hydrolysis pseudo-boehmite, add 1.6 g of sodium bicarbonate, 3 g of methyl cellulose, and 2.5 g of clay, and mix uniformly; add Al2O3 38g of aluminum sol with a content of 10% was stirred and kneaded evenly; a clover orifice plate with a diameter of 4.0mm was selected to extrude clover strips, and then a shaping machine was used for shaping to keep the particle length between 3 and 8mm.

[0035] After shaping, the particles were hardened at 45°C for 24 hours, then transferred to an oven, dried at 120°C for 4 hours, and then calcined at 1000°C for 4 hours in a high-temperature furnace to obtain a catalyst, numbered CAT-3.

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Abstract

The invention belongs to the technical field of industrial catalysts, and particularly relates to an alpha-phenylethanol dehydration catalyst and a preparation method thereof, the alpha-phenylethanoldehydration catalyst is prepared by taking an alumina precursor as a raw material, adding a modifying aid, an adhesive, an extrusion aid and a hardener, and then carrying out extrusion molding, reinforced hardening, drying, activation and other processes. The catalyst is simple in preparation process, high in mechanical strength in a water-containing reaction system, free of pulverization after long-term use, suitable for alpha-phenylethanol dehydration and other reactions, high in selectivity and good in activity stability.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysts, and in particular relates to an alpha-phenylethanol dehydration catalyst and a preparation method thereof. Background technique [0002] Styrene is an important basic organic chemical raw material, mainly used in the production of polystyrene resin, acrylonitrile-butadiene-styrene terpolymer, styrene-acrylonitrile copolymer, etc. In addition, it can also be used in pharmaceuticals, pesticides, dyes and other industries, and has a wide range of uses. [0003] There are two technical routes for the industrial production of styrene: dehydrogenation of ethylbenzene and dehydration of α-phenylethanol. Among them, the α-phenylethanol dehydration technology is mainly used in the co-oxidation method to produce propylene oxide and styrene (POSM process), and there are two ways of liquid phase dehydration and gas phase dehydration. [0004] The liquid-phase dehydration method of α-phenyletha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/04C07C1/24C07C15/46
CPCB01J23/04C07C1/24C07C2523/04C07C15/46
Inventor 秦丽红陈文勇王龙
Owner SHANDONG QILU HUAXIN HIGH TECH
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