Alkylation reaction product separation device and separation method

Abstract

The invention discloses an alkylation reaction product separation device and separation method. The separation method comprises the following steps that (1) an alkylation reaction product from an alkylation reaction unit is introduced into a first fractionator, a gas-phase object which is educed from the top of the first fractionator is pressurized by a gas compressor as a hot source of a reboilerat the bottom of the first fractionator, and a part of a fractionator overhead stream after heat exchange and condensation returns to the fractionator top as a reflux of the first fractionator; (2) abottom liquid-phase stream of the first fractionator is introduced into a second fractionator for fractionation and separation; and (3) a bottom liquid-phase stream of the second fractionator is introduced into a third fractionator for fractionation and separation, and the bottom liquid-phase stream of the third fractionator is taken as an alkylation product. According to the separation method provided by the invention, by performing two-stage separation on isobutane fraction in the alkylation reaction product, the total energy consumption of an alkylation separation is greatly lowered.

Description

technical field [0001] The invention relates to a mixture separation device and separation method, more specifically, to an alkylation reaction product separation device and separation method. Background technique [0002] The alkylation reaction of isobutane and olefins occurs under the action of an acidic catalyst, and the alkylated gasoline obtained through the alkylation reaction does not contain impurities such as sulfur and nitrogen, does not contain aromatics and olefins, and has a higher octane number , is an ideal clean gasoline blending component. [0003] Propylene, butene and pentene can all undergo alkylation reaction with isobutane to produce alkylated gasoline. The octane number of alkylated gasoline produced by butane reaction, propylene is an important chemical raw material, and pentene is a component of light gasoline and has a high octane number. Therefore, industrial alkylation units are mainly based on Isobutane and butene are used as raw materials to ...

AI Technical Summary

Problems solved by technology

Reducing the external alkene ratio of the alkylation unit and reducing the flow rate of circulating isobutane is an effective way to reduce the energy consumption required for the separation process of circulating isobutane, but the reduction of the external alkene ratio is often subject to certain restrictions. When the external alkene ratio is lower than 7:1, the selectivity of the alkylation reaction will be significantly affected. Therefore, it is necessary to develop other energy-saving technologies while reducing the external alkene ratio as much as possible.

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