Alkylation Reactor Product will limit the service factor of sulfuric acid alkylation units (SAAU). Thus, the removal of entrained acid and both neutral and acidic ester compounds, from the alkylate, must take place before the product can fractionated to recover the excess isobutene. The ESTEREX™ process is the FIBER FILM® technology that has been developed to extract these ester compounds and purify the alkylation unit effluent.