Acid hydrocarbon separation and recycling device of sulfuric acid alkylation system

Abstract

The invention discloses an acid hydrocarbon separation and recycling device of a sulfuric acid alkylation system. The acid hydrocarbon separation and recycling device comprises a reactor, a storage tank, a primary settling tank, a secondary settling tank and a hydrocarbon compressor, wherein the primary settling tank is connected with the reactor through a first pipeline and a second pipeline respectively; the outlet end at the upper end of the primary settling tank is connected with the inlet end at the upper end of the secondary settling tank through a third pipeline; the outlet end at the upper end of the secondary settling tank is connected with the input end of the hydrocarbon compressor through a fourth pipeline; the outlet end at the lower end of the secondary settling tank is connected with the storage tank through a fifth pipeline; the output end of the hydrocarbon compressor is connected with the reactor through a sixth pipeline. By adopting the technical scheme of the invention, acid hydrocarbon can be separated, a good separation effect can be achieved, stability and reliability are achieved, consumption of the device is reduced, the cost is lowered, and the security ofthe storage tank is also ensured.

Description

technical field [0001] The invention relates to the field of sulfuric acid alkylation systems, in particular to an acid hydrocarbon separation and recovery device for the sulfuric acid alkylation system. Background technique [0002] The current sulfuric acid alkylation system uses olefins and isobutane in C4 after ether as raw materials, and reacts the olefins and isobutane under the action of catalyst sulfuric acid to generate alkylate oil. However, since the olefin and isobutane raw materials react with catalyst sulfuric acid in this system, the concentration of sulfuric acid needs to be controlled above 90% to ensure a good reaction, but after the reaction of olefin and isobutane with sulfuric acid, the concentration of sulfuric acid will decrease, so , the catalyst sulfuric acid needs to be replaced frequently to ensure the concentration of the acid. During normal operation, a large amount of hydrocarbons and acids will be withdrawn out of the system, which will cause a...

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Problems solved by technology

However, since the olefin and isobutane raw materials react with catalyst sulfuric acid in this system, the concentration of sulfuric acid needs to be controlled above 90% to ensure a good reaction, but after the reaction of olefin and isobutane with sulfuric acid, the concentration of sulfuric acid will decrease, so , the catalyst sulfuric acid needs to be replaced frequently to ensure the concentration of the acid. During normal operation, a large amount of hydrocarbons and acids will be withdrawn out of the system, which will cause a large loss of hydrocarbons in the sulfuric acid alkylation system, resulting in increased costs. At the same time, there is a large amount of liquid hydrocarbons in the waste acid tanks in the tank area, which will cause great safety hazards

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