Patent name: METHOD FOR ALKYLATION OF C4-C5 ISO-PARAFFINS WITH C3-C5 OLEFINS
Patent Number: Patent No. 2114808
Priority: March 29, 1995
Invention relates petrochemical synthesis namely to sulfuric acid alkylation of C4-C5 iso-paraffins with C3-C5 olefins to produce high-octane motor fuel additives. Selectivity of alkylation can be considerably increased, consumption of sulfuric acid reduced (by 30-40%), and induction period eliminated, when sulfuric acid is supplemented by 5-10 wt % sulfolane. Process is carried out in flow reactor within temperature range 0-10°C, at pressure providing liquid state of reactants, catalyst/hydrocarbon volume ratio about 1:1, and olefin volume rate 0.2-0.3 h-1. Under indicated conditions, trimethylpentane content in alkylate is 1.2-1.3 times increased and, correspondingly, octane number increases by 4-5 points. Duration of induction period needed to develop sulfuric acid is reduced by a factor 50 to 100. Simultaneously, complete and instantaneous segregation of acid-hydrocarbon emulsion formed in reactor occurs sulfuric acid consumption to produce ton of alkylate is reduced by 30-40 %. Invention can be used at petrochemical plants.