Effects of reaction temperature on reactions between 1 hexene and H2S over NiMoS/γ Al2O3

Key words:  1 hexene  hydrogen sulfide  mercaptan  thiophene

Abstract:

The reactions between 1 hexene and H₂S under different reaction temperatures were studied over NiMoS/γ Al₂O₃ catalyst in the high pressure autoclave, and the reaction mechanism was discussed. The results show that the sulfur compounds including mercaptans and thiophenes are mainly formed in the reaction between 1 hexene and H₂S. The higher the reaction temperature, the more the content of sulfide compounds formed. Mercaptans mainly include 2 hexanethiol and n propyl mercaptan. The amount of 2,5 dimethylthiophene, which is the most one in the amount of formed thiophenes, also increases significantly with the increase of reaction temperature. Thiophenes mainly include 2,5 dimethylthiophene, 2 ethylthiophene and 2 propylthiophene, the sum of the mass fraction of above three thiophene compounds is up to 69.46％ when the reaction temperature is 350 ℃. Hydrogenation reaction and double bond isomerization reaction of 1 hexenewere occur. With the reaction temperature increasing, the mass fractions of hexane and 3 hexene increase, and the mass fraction of 2 hexene increases first and decreases afterwards.