Industrial production and regeneration method for preparing ethylbenzene from dry gas

Abstract

The invention provides an industrial production and regeneration method for preparing ethylbenzene from dry gas, which mainly solves the regeneration problem in the industrial production process of preparing ethylbenzene from dry gas and also solves the problems of tail gas debenzolization and heat utilization. The method is characterized in that two parallel fixed bed reactors are filled with the same characteristic catalyst, and the catalyst can catalyze alkylation reaction and / or transalkylation reaction under proper operation conditions. Under normal working conditions, the two reactors are connected in parallel, alkylation reaction of ethylene and benzene is mainly carried out in the alkylation reactor, and transalkylation reaction of benzene and polyethylbenzene is mainly carried out in the transalkylation reactor. When regeneration is carried out in one reactor catalyst device, raw material dry gas in the other reactor is normally fed, and normal production is achieved. The two reactors can be flexibly switched between normal production and regeneration operation, and the normal operation of the other reactor is not influenced when one reactor is regenerated. Compared with a regeneration method adopted in the industry at present, the device is not stopped in the regeneration period, feed gas containing ethylene is not lost, and the economic benefit of a refinery plant is greatly improved.

Description

technical field [0001] The invention provides a method for industrial production and regeneration of ethylbenzene produced from dry gas. Specifically, it is a method for converting ethylene-containing dry gas into high value-added ethylbenzene products. This method is suitable for dry gas with different ethylene concentrations and different sources, in the industrial production process and under the conditions of catalyst regeneration , the device does not stop, and can obtain ideal ethylbenzene products. Background technique [0002] Ethylbenzene is an important organic chemical raw material, mainly used to produce styrene, and then to produce polystyrene, engineering plastics and styrene-butadiene rubber. In recent years, with the development of the economy, my country's demand for ethylbenzene has continued to grow, and the supply has been in short supply all year round. More than 40% of the demand depends on imports every year. [0003] At the same time, with the conti...

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Problems solved by technology

[0003] At the same time, with the continuous development of my country's oil refining industry, a large amount of dry gas tail gas is produced in the refinery, and the amount of ethylene in it is considerable, which is usually used as fuel or burned directly by torching, resulting in a huge waste of resources

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