Benzene → Cumene

A zeolite-catalyzed cumene synthesis process in which benzene and propylene feedstocks are pre-treated to remove catalyst poisons. The benzene feedstock is pre-treated under pressure by contact with a “hot” clay bed at a temperature of about 200 to 500° C., followed by distillation of the benzene feedstock to separate the benzene from the higher molecular weight materials formed from olefinic poisons during the hot clay treatment. The benzene feed is also subjected to a “cold” clay treatment wherein the benzene distillate is contacted with an ambient-temperature clay. The propylene feedstock is pre-treated by contact with an alumina to remove trace sodium compounds and moisture, a molecular sieve to remove moisture, and two modified aluminas to remove catalyst poisons. The pre-treated propylene and benzene feedstocks are then reacted in the presence of a zeolite catalyst to form cumene without causing rapid degradation of the catalyst's activity.

1. additionare pre-treated
2. customto remove catalyst poisons
3. additionThe benzene feedstock is pre-treated under pressure by contact with a “hot” clay bed at a temperature of about 200 to 500° C.
4. distillationfollowed by distillation of the benzene feedstock
5. customto separate the benzene from the higher molecular weight materials
6. customformed from olefinic poisons during the hot clay treatment
7. customto remove trace sodium compounds and moisture
8. customa molecular sieve to remove moisture, and two modified aluminas
9. customto remove catalyst poisons
10. customThe pre-treated propylene and benzene feedstocks are then reacted in the presence of a zeolite catalyst

ORD record

ord-62f66e37d73943b18de06fbaf20ed356

Source dataset

uspto-grants-2002_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06355851B1