Alkylation reaction method for isoparaffin and alkene with liquid acid for catalysis

The invention provides an alkylation reaction method for isoparaffin and alkene with liquid acid for catalysis. The method is characterized in that the method comprises the following steps: alkylation reaction raw materials are fed from a side surface of a static mixer in one stream or several streams, the raw materials and an acid hydrocarbon emulsion which is in a main runner of the static mixer are mixed and contacted, after the mixture is reacted and contacted for 0.2-15 minutes, pressure reduction is carried out for the mixture, the mixture enters a separator, the pressure of the separator is controlled at 0.005-0.18MPa, butane is vaporized in order to take away reaction heat, the acid phase below the separator is supercharged by an acid circulation pump and recycled to the main runner of the static mixer; gas phase components which are separated from an upper part of the separator enter a compressor system, and the components are compressed and condensed by a compressor in order to cool the alkylation reaction raw materials; a hydrocarbon phase which is partially separated from the separator enters a coalescer, most of the hydrocarbon phase which is separated from the coalesce is supercharged by a hydrocarbon circulation pump and mixed with the raw materials, and the mixture enters the side surface of the static mixer for feeding; an acid phase which is separated from the lower part of the coalesce returns an inlet of the circulation pump; a small part of a hydrocarbon phase which is extracted from the upper part of the coalescer enters a deisobutanizer, isobutane which is obtained from the top of the deisobutanizer is circulated and returns to the static mixer, and alkylation products are obtained from the bottom of the deisobutanizer.