Alkylation by controlling olefin ratios

A process for alkylating comprising:

• (a) contacting C3 olefins that are substantially free of C4 and C5 olefins, with an isoparaffin in the presence of an acid catalyst, to produce a first alkylate product and a first spent acid;
• (b) contacting C4 olefins that are substantially free of C3 and C5 olefins, with an isoparaffin in the presence of the spent acid catalyst of step (a), to produce a second alkylate product and a second spent acid;
• and
• (c) contacting C5 olefins that are substantially free of C3 and C4 olefins, with an isoparaffin the presence of the spent acid catalyst of step (b), to produce a third alkylate product and a third spent acid.

A process for alkylating comprising:

• (a) contacting C3 olefins that are substantially free of C4 olefins, with an isoparaffin in the presence of an acid catalyst, to produce a first alkylate product;
• (b) contacting C4 olefins that are substantially free of C3 olefins, with an isoparaffin in the presence of an acid catalyst, to produce a second alkylate product;
• (c) recovering the acid catalyst of step (a) and the acid catalyst of step (b) to form a recovered acid catalyst product;
• and
• (d) recycling a portion of the recovered acid catalyst product back to step (a) to comprise the acid catalyst in step (a), and a portion of the recovered acid catalyst stream back to step (b) to comprise the acid catalyst in step (b).