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Catalyst for ethylbenzene and ethanol synthesis to realize shape-selectivity alkylation for diethylbenzene

A technology for p-diethylbenzene and shape-selective alkane, which is applied in the field of shape-selective alkylation catalysts, can solve problems such as serious disproportionation side reactions, shortage of petrochemical raw materials, etc., and achieves high selectivity, less side reactions, and good actual process effects. Effect

Inactive Publication Date: 2012-06-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention mainly solves serious side reactions such as disproportionation reaction and isomerization reaction in the existing technology of synthesizing p-diethylbenzene from ethylbenzene and ethylene, thereby improving the effect of ethylbenzene alkylation reaction; The shortage of petrochemical raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Using SiO 2 / Al 2 o 3 42 grams of hydrogen-type HZSM-5 molecular sieve with a molar ratio of 140 and 12 grams of r-Al 2 o 3 Mix, then add 1.8 grams of Tianqing powder and mix evenly, then add a certain amount of 3% dilute nitric acid as a binder, knead well, carry out extrusion molding, dry at 120°C for 2 hours, and then roast at 540°C for 1 hour . The shaped zeolite is impregnated with a n-hexane solution of 15% active hydrogen siloxane modifier, dried at 120°C for 2 hours, and then calcined at 500°C for 3 hours, and the surface is modified by liquid-phase silicon deposition. Catalyst I was processed and the deposition amount of silicon dioxide was 6.7wt%.

Embodiment 2

[0028] The HZSM-5 molecular sieve prepared by the method described in Example 1 was impregnated with the obtained molecular sieve in 7.0% concentration of magnesium nitrate and 2.3% concentration of barium nitrate aqueous solution. After the impregnation, the remaining impregnation solution was filtered off. It was dried at 120°C for 3 hours, and then calcined at 540°C for 4 hours. The temperature was programmed to rise at a rate of 3°C / min. It was designated as catalyst II, with a loading of magnesia of 3.2% and a loading of barium oxide of 1.5%.

Embodiment 3

[0030] The HZSM-5 molecular sieve prepared by the method described in Example 1 was impregnated with the obtained molecular sieve in 6.5% concentration of cerium nitrate and 5.1% concentration of lanthanum nitrate aqueous solution. After the impregnation, the remaining impregnation solution was filtered off. It was dried at 120°C for 3 hours, and then calcined at 540°C for 4 hours. The temperature was programmed at a rate of 3°C / min. It was designated as Catalyst III, with a loading of cerium oxide of 3.5% and a loading of lanthanum oxide of 2.4%.

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Abstract

The invention relates to a catalyst for ethylbenzene and ethanol synthesis to realize shape-selectivity alkylation for diethylbenzene, which mainly resolves problems that existing ethylbenzene and ethanol synthesis is severe to secondary reaction such as ethylbenzene disproportionated reaction, isomerization reaction and the like in the technology of the diethylbenzene. Bioethanol can be used for replacing ethylene to resolve the problem that petrifaction raw materials are deficient. The technical scheme includes that the catalyst comprises, by weight, from 50 to 90 parts of hydrogen silicon-aluminum zeolite, from 1 to 10 parts of at least two metallic oxides of rare earth or alkaline metallic oxides and oxide binder, wherein SiO2 / Al2O3 mole ratio of the hydrogen silicon-aluminum zeolite is 20-200, the hydrogen silicon-aluminum zeolite is a 10-member ring pore structure, and the problems are resolved better. Reaction conditions of the synthesis to the diethylbenzene include that reaction temperature ranges from 350 DEG C to 450 DEG C; total pressure ranges from 0.2MPa to 2.0MPa; the ratio of ethylbenzene to ethanol ranges from 2.0 to 6.0; and space velocity ranges from 1-8h-1. The catalyst is applied to ethylbenzene alkylation process for the ethylbenzene and ethanol synthesis to the diethylbenzene, and has good catalytic reaction selectivity and yield.

Description

technical field [0001] The invention relates to a shape-selective alkylation catalyst for synthesizing p-diethylbenzene from ethylbenzene and ethanol. The catalyst can be used in the chemical production of synthesizing p-diethylbenzene, and can especially catalyze the synthesis of para-alkyl with high selectivity. Ethylbenzene, and avoid the generation of m- and ortho-diethylbenzene by-products; and bioethanol can be used to replace ethylene to solve the shortage of petrochemical raw materials. Background technique [0002] P-divinylbenzene can be obtained by dehydrogenation of p-diethylbenzene, and p-divinylbenzene comonomer is widely used in the production of existing polystyrene plastics. The produced polymers have excellent specific gravity, heat resistance, transparency and shrinkage. Efficiency and other aspects are better than pure polystyrene. At the same time, divinylbenzene can also be used as a crosslinking agent in the polymerization production of new plastic ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/65B01J29/85B01J29/70C07C15/02C07C2/88
Inventor 朱志荣胡中华李军辉刘景明伍炼文王晓平
Owner TONGJI UNIV
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