Method of preparing ethyl benzene by saparating ethene and benzene under dry gas of catalysis

Abstract

This invention is a process for preparing ethyl benzene through the phase-changing catalytic separation of benzene and ethylene in the dry catalytic cracking gas. Benzene and the dry catalytic cracking gas enter the reaction column from the upper and the lower portion, respectively. The temperature of the reaction section is close to the boiling temperature of benzene under the operation conditions. In the reaction section the heat needed for the vaporization of the liquid benzene is utilized to absorb the heat released during the reaction of benzene with ethylene in the dry catalytic cracking gas. The upper and lower effluents are utilized for heating benzene and the dry gas, respectively. The dry catalytic cracking gas comprises 10-60 vol. % of ethylene, 100-500ppm of H2S, 1.0-5.0 vol. % of COx, 0.1-1.5 vol.% of oxygen and saturated water vapor at 20-40 deg.C. The conditions for the hydrocarbonylation reaction are: the pressure is 1.0-3.5MPa, the temperature is 150-260 deg.C, the molar ratio of benzene to ethylene in the dry catalytic cracking gas is 1-10, and the weight flow rate of ethylene in the dry catalytic cracking gas is 0.05-1.5h-1.

Description

technical field [0001] The invention relates to a preparation method of ethylbenzene, in particular to a method for preparing ethylbenzene by catalytic separation of ethylene and benzene in a catalytic cracking dry gas in a different phase. Background technique [0002] Alkyl aromatics are widely used intermediate products, the most important of which are ethylbenzene and cumene. Ethylbenzene is the key raw material for the production of styrene, and styrene is an important monomer for the synthesis of polymer materials, mainly used for the production of Taking polystyrene and copolymer ABS resin, AS resin, styrene-butadiene rubber, and unsaturated polyester, etc., in the past ten years, the production capacity of ethylbenzene in the world has more than doubled, with a total output of 20 million tons per year. In recent years, my country's demand for this kind of plastic has also increased day by day. In 2000 alone, my country's demand for styrene reached 1.2 million tons per ...

AI Technical Summary

Problems solved by technology

Due to the exothermic reaction of ethylene and benzene to ethylbenzene in the current general-purpose liquid-phase fixed bed, it often leads to a large temperature rise in the catalyst bed, which affects the selectivity of the product and should be removed by external heat extraction.

In addition, in the liquid-phase fixed bed where ethylene and benzene generate ethylbenzene, since benzene is a continuous liquid phase, for ethylene gas, it is actually a bubbling bed at this time, which directly affects the conversion rate of ethylene.

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