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Catalyst for preparing styrene by phenylethanol dehydration as well as preparation and application methods of catalyst

An application method and catalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst activity decline, etc., and achieve easy operation and reduce the occurrence of side reactions of carbon deposition in styrene Probability, effect of simple preparation method

Active Publication Date: 2021-01-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The dehydration reaction of α-phenylethanol usually occurs in the presence of a solid acid catalyst. Since styrene molecules are easy to polymerize under the action of acid, carbon deposits can be formed on the surface of the solid catalyst during use, thereby reducing the activity of the catalyst.

Method used

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  • Catalyst for preparing styrene by phenylethanol dehydration as well as preparation and application methods of catalyst
  • Catalyst for preparing styrene by phenylethanol dehydration as well as preparation and application methods of catalyst

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0024] (1) Weigh aluminum nitrate (Al(NO 3 ) 3 "9H 2 O) 20g and zirconium oxychloride (ZrOCl 2 "8H 2 (0) 6.3g, dissolved in 200mL deionized water;

[0025] (2) Add 1-butyl-3-methylimidazolium bromide (2.0g) and 1-butanesulfonate-3-methylimidazolium bisulfate (8.0g) to the solution obtained in step (1);

[0026] (3) Add 5 g of urea to the mixture obtained in step (2), and react at 60° C. for 3 hours;

[0027] (4) centrifuging the mixture obtained in step (3), and washing the obtained gel with deionized water until the pH value of the washing solution is <8;

[0028] (5) Put the gel obtained in step (4) into an oven, dry at 100° C. for 12 hours, and then bake at 500° C. for 5 hours to obtain a Zr—Al catalyst.

preparation Embodiment 2～4

[0033] The same as the preparation method of Preparation Example 1, just change the sulfonic acid functionalized imidazole type ionic liquid in step (2) to be 1-butanesulfonic acid group-3-methylimidazole trifluoromethanesulfonate, 1-butanesulfonic acid Base-3-methylimidazole p-toluenesulfonate and 1-butanesulfonate-3-methylimidazole methanesulfonate to prepare the respective required Zr-Al catalysts of the present invention.

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Abstract

The invention discloses a ZrAl catalyst. The catalyst is composed of ZrO2-Al2O3, and the weight percentage of the catalyst is 20-50%. The catalyst is prepared by a following method: reacting a mixed solution of aluminum and zirconium precursors with urea to form gel; and drying the gel and roasting the gel to obtain the catalyst. The preparation method is simple, easy to operate and high in repeatability. The invention also discloses a use method of the catalyst for catalyzing alpha-phenylethanol dehydration to prepare styrene. The catalyst has high activity, produces less carbon deposit and has good catalytic stability.

Description

technical field [0001] The invention belongs to the technical field of styrene production; it relates to a catalyst for preparing styrene by dehydration of phenylethanol and its preparation and application method; more specifically, it relates to a heterogeneous catalyst for catalyzing the dehydration of α-phenylethanol to prepare styrene Zr-Al catalyst and methods for its preparation and application. Background technique [0002] Styrene is an important organic chemical raw material with a wide range of uses. It can be used as a monomer to produce polystyrene resin (PS), acrylonitrile-butadiene-styrene terpolymer (ABS) and styrene- Acrylonitrile copolymer (SAN), etc., can also be used in dyestuffs, pharmaceuticals, pesticides and other industries. [0003] At present, the industrialized styrene production technologies mainly include three process routes: ethylbenzene dehydrogenation method, propylene oxide / styrene co-production method and pyrolysis gasoline extraction of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/10B01J37/00B01J37/08C07C1/24C07C15/46
CPCB01J21/066B01J37/0018C07C1/24B01J35/60C07C15/46
Inventor 薛伟刘继东吕建华
Owner HEBEI UNIV OF TECH
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