Synthesis of 2,5-dimethylhexene by isobutene dimerization with H 2 S co-feeding.

This study investigates the effect of hydrogen sulfide (H 2 S) co-feeding on the synthesis of 2,5-dimethyl-1-hexene, 2,5-dimethyl-2-hexene, and 2,5-dimethylhexane (2,5-DMHs), useful compounds, using the dimerization of isobutene under mild pressure conditions. The dimerization of isobutene did not proceed in the absence of H 2 S, whereas the desired products of 2,5-DMHs were produced under H 2 S co-feeding conditions. The effect of reactor size on the dimerization reaction was then examined, and the optimal reactor was discussed. To enhance the yield of 2,5-DMHs, we changed the reaction conditions of the temperature, molar ratio of isobutene to H 2 S (iso-C 4 [double bond, length as m-dash] /H 2 S) in the feed gas, and the total feed pressure. The optimum reaction condition was at 375 °C and 2/1 of iso-C 4 [double bond, length as m-dash] /H 2 S. The product of 2,5-DMHs monotonously increased by an increment of total pressure from 1.0 to 3.0 atm with a fixed iso-C 4 [double bond, length as m-dash] /H 2 S ratio at 2/1.