Method for preparing ethylbenzene by ethanol and benzene vapor-phase alkylation

A technology of alkylation and ethanol, applied in chemical instruments and methods, organic chemistry, molecular sieve catalysts, etc., can solve the problems of poor catalyst stability, short regeneration cycle, high content of xylene impurities, etc., and achieve good technical effects

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing technology has the problems of high xylene impurity content in the product ...

Method used

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  • Method for preparing ethylbenzene by ethanol and benzene vapor-phase alkylation
  • Method for preparing ethylbenzene by ethanol and benzene vapor-phase alkylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 200g SiAl Molar Ratio SiO 2 / Al 2 o 3 =100, the ZSM-5 molecular sieve with a grain diameter of 200 nanometers is exchanged three times with 2 liters of 0.1 mol / liter hydrochloric acid at 85°C, washed with deionized water until there is no chlorine radical, dried at 110°C, and then calcined at 580°C for 4 hours Backup.

[0024] 20 grams of the above-mentioned molecular sieves and 50 milliliters of 0.25 mol / liter magnesium nitrate aqueous solution were impregnated at room temperature for 4 hours, then dried at 110° C., and then calcined at 550° C. for 4 hours. Mix it with alumina binder at a ratio of 70:30, add 2% of scallop powder and 10% by weight of dilute nitric acid solution, knead, and extrude to form a Φ1.8mm strip. After baking at 110°C for 10 hours, and then baking at 550°C for 4 hours, the obtained catalyst contains 1.0% by weight of MgO.

[0025] Treat the above catalyst with water vapor at 580°C under normal pressure for 2 hours, and then treat it with 1.5...

Embodiment 2～11

[0027] Same as [Example 1], just change the SiO of ZSM-5 molecular sieve 2 / Al 2 o 3 Molar ratio, grain size, ratio of molecular sieve to alumina and alkaline earth metal oxide, steam treatment and phosphoric acid treatment conditions. See Table 1 for details.

Embodiment 12

[0039] Same as [Example 1], except that the catalyst contains 1.0% by weight of CaO.

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Abstract

The invention relates to a method for preparing ethylbenzene by ethanol and benzene vapor-phase alkylation and mainly solves the problem that the content of xylene impurity in the product ethylbenzene is high and a catalyst has poor stability and short regeneration period in the prior art. According to the invention, ethanol and benzene are used as reaction raw materials. Under the condition that reaction temperature is 300-460 DEG C, reaction pressure is 0.5-2.8 MPa, ethanol WHSV is 0.1-5.0h<-1> and the benzene/ethanol mole ratio is 2-10, the reaction raw materials contact with a catalyst to carry out vapor-phase alkylation reaction so as to generate ethylbenzene. The catalyst used comprises the following ingredients of: by weight, a) 40-90% of ZSM-5 molecular sieve with the silicon-aluminium mol ratio SiO2/Al2O3 being 30-400 and grain size being 5-350 nm; b) 9-59% of a binder alumina or silicon dioxide; and c) 0.1-10% of alkaline earth oxide. The catalyst successively undergoes high-temperature stream and phosphoric acid treatments before used. By the adoption of the technical scheme, the above problem is solved well. The method provided by the invention can be used in industrial production of ethylbenzene prepared by ethanol and benzene vapor-phase alkylation.

Description

technical field [0001] The invention relates to a method for preparing ethylbenzene by vapor-phase alkylation of ethanol and benzene. Background technique [0002] Ethylbenzene is an important petrochemical raw material, mainly used in the production of styrene, which is the main raw material for the production of polystyrene and other copolymer resins. Ethylbenzene can be produced by various processes, mainly traditional AlCl 3 There are two types of liquid-phase alkylation method and molecular sieve alkylation method, among which the molecular sieve alkylation production process has achieved great success. In the 1980s, Mobil and Badger successfully launched the gas-phase alkylation process of molecular sieves to produce ethylbenzene. This process uses ZSM-5 zeolite as the catalyst, and has the advantages of no corrosion, no pollution, simple process and high heat recovery rate. The US patent This has been described in detail in US3751504, US3751506, US4016218 and US4547...

Claims

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Application Information

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IPC IPC(8): C07C15/073C07C2/86B01J29/40
CPCY02P20/52
Inventor 杨为民孙洪敏张斌沈震浩宦明耀
Owner CHINA PETROLEUM & CHEM CORP
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