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In a process for the transalkylation of polycyclohexylbenzenes, a feed containing at least one polycyclohexylbenzene is contacted with benzene under transalkylation conditions with a catalyst comprising a zeolite USY having a silica to alumina molar ratio in excess of 10 to convert at least part of

In a process for the transalkylation of polycyclohexylbenzenes, a feed containing at least one polycyclohexylbenzene is contacted with benzene under transalkylation conditions with a catalyst comprising a zeolite USY having a silica to alumina molar ratio in excess of 10 to convert at least part of said polycyclohexylbenzene to cyclohexylbenzene.

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1. A process for the transalkylation of polycyclohexylbenzenes, the process comprising contacting a feed containing at least one polycyclohexylbenzene with benzene under transalkylation conditions with a transalkylation catalyst comprising a zeolite USY having a silica to alumina molar ratio in exce

1. A process for the transalkylation of polycyclohexylbenzenes, the process comprising contacting a feed containing at least one polycyclohexylbenzene with benzene under transalkylation conditions with a transalkylation catalyst comprising a zeolite USY having a silica to alumina molar ratio in excess of 10 to convert at least part of said polycyclohexylbenzene to cyclohexylbenzene. 2. The process of claim 1, wherein the feed comprises at least part of an effluent produced by a method comprising contacting benzene and hydrogen under hydroalkylation conditions with a hydroalkylation catalyst comprising a hydrogenation metal and a molecular sieve selected from zeolite beta, zeolite X, zeolite Y, mordenite, MCM-68 and a molecular sieve of the MCM-22 family. 3. A process for producing cyclohexylbenzene, the process comprising: (a) contacting benzene and hydrogen with a hydroalkylation catalyst under hydroalkylation conditions to produce an effluent containing cyclohexylbenzene and a polycyclohexylbenzene;(b) separating cyclohexylbenzene from said effluent; and(c) reacting at least part of the polycyclohexylbenzene from said effluent with benzene under transalkylation conditions with a transalkylation catalyst comprising a zeolite USY having a silica to alumina molar ratio in excess of 10 to convert at least part of said polycyclohexylbenzene to cyclohexylbenzene. 4. The process of claim 3, wherein the hydroalkylation catalyst comprises a hydrogenation metal and a molecular sieve selected from zeolite beta, zeolite X, zeolite Y, mordenite, MCM-68 and a molecular sieve of the MCM-22 family. 5. A process for producing phenol and cyclohexanone, the process comprising: (a) producing cyclohexylbenzene by the process claimed in claim 3;(b) oxidizing at least part of the cyclohexylbenzene to produce cyclohexylbenzene hydroperoxide; and(c) cleaving at least part of the cyclohexylbenzene hydroperoxide to produce phenol and cyclohexanone. 6. The process of claim 3, wherein the zeolite USY of the transalkylation catalyst has a silica to alumina molar ratio in excess of 25. 7. The process of claim 3, wherein the zeolite USY of the transalkylation catalyst has a silica to alumina molar ratio in excess of 50. 8. The process of claim 3, wherein the zeolite USY of the transalkylation catalyst has a unit cell size less than or equal to 24.50. 9. The process of claim 3, wherein the transalkylation catalyst has an alpha value less than 100. 10. The process of claim 3, wherein the transalkylation catalyst includes an alumina binder. 11. The process of claim 3, wherein said transalkylation conditions comprise a temperature of 100° C. to 300° C., a pressure of 350 kPA to 4200 kPa, and a benzene to polycyclohexylbenzene molar ratio of 1:1 to 50:1. 12. The process of claim 3, wherein the polycyclohexylbenzene comprises di-cyclohexylbenzene. 13. The process of claim 3, wherein the polycyclohexylbenzene comprises tri-cyclohexylbenzene. 14. The process of claim 3, wherein the silica to alumina molar ratio is no greater than 1,000. 15. The process of claim 3, wherein the silica to alumina molar ratio is from 25 to 1,000. 16. The process of claim 8, wherein the zeolite USY of the transalkylation catalyst has a unit cell size less than or equal to 24.26.