Liquid acid alkylation reaction method and device

Abstract

The invention relates to a liquid acid alkylation reaction method and device. The device comprises a reactor, a separator, a first-stage coalescer, a second-stage coalescer, an isobutane removing tower, a compressor, a waste acid pump, an acid circulating pump, a pipeline mixer and a raw material pipeline, wherein the raw material pipeline is connected to the reactor through a raw material inlet, and the discharge port of the reactor is connected to the isobutane removing tower through feed ports of the separator, the first-stage coalescer and the second-stage coalescer. The method comprises the following steps: carrying out alkylation reaction on alkylation reaction raw materials in a reactor by taking sulfuric acid and fuming sulfuric acid as catalysts, and separating a reaction product to obtain the alkylated gasoline, wherein the alkylation reaction temperature is 15-40 DEG C, the reaction pressure is 0.1-1 MPa, and the contact time in the reactor is 0.2-15 minutes. According to the method, a concentrated sulfuric acid catalyst system formed by fuming sulfuric acid is adopted, so that the selectivity and octane number of alkylation products are improved, the generation of non-ideal products is reduced, the acid consumption is favorably reduced, and the subsequent treatment process and cost are simplified.

Description

technical field [0001] The invention belongs to the technical field of chemical production and relates to a liquid acid alkylation reaction method and device. Background technique [0002] At present, the octane number of gasoline mainly comes from olefins, aromatics, isoparaffins and oxygen-containing additives (antiknock agents). Olefins and aromatics are strictly restricted components of National IV gasoline. Among the various high-octane gasoline components, only alkylated oil has the advantages of olefin-free, aromatic-free, low sulfur, high octane, and low vapor pressure. It has been used for decades without any controversy, and is known as Deploy the "golden liquid" of clean gasoline. [0003] Alkylation oil is obtained by the alkylation reaction of isobutane and butene under the action of a catalyst, and its main composition is C8 isoparaffins, free of olefins, aromatics and sulfur, with high octane number and low vapor pressure The advantages. Sulfuric acid and ...

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Problems solved by technology

In this method, the high-speed agitation of the impeller when acid and hydrocarbon are mixed requires more energy, and acid washing, alkali washing and water washing are required when the product is separated, and the acid consumption is relatively high.

[0006] At present and in the future, alkylation upgrading gasoline and diesel will become an important direction of my country's oil refining industry, but the treatment of alkylation waste acid is difficult, and the organic phase in it also has great recycling value. Therefore, it is urgent to develop A new method is developed to realize the effective treatment of alkylation waste acid and improve the recovery of organic phase

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