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In a process for producing a methyl-substituted biphenyl compound, at least one methyl-substituted cyclohexylbenzene compound of the formula: wherein each of m and n is independently an integer from 1 to 3, is contacted with a dehydrogenation catalyst under conditions effective to produce a dehydro

In a process for producing a methyl-substituted biphenyl compound, at least one methyl-substituted cyclohexylbenzene compound of the formula: wherein each of m and n is independently an integer from 1 to 3, is contacted with a dehydrogenation catalyst under conditions effective to produce a dehydrogenation reaction product comprising at least one methyl-substituted biphenyl compound. The dehydrogenation catalyst comprises an element or compound thereof from Group 10 of the Periodic Table of Elements deposited on a refractory support, such as alumina.

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1. A process for producing a methyl-substituted biphenyl compound, the process comprising: (a) contacting at least one methyl-substituted cyclohexylbenzene compound of the formula: with a dehydrogenation catalyst under conditions effective to produce a dehydrogenation reaction product comprising at

1. A process for producing a methyl-substituted biphenyl compound, the process comprising: (a) contacting at least one methyl-substituted cyclohexylbenzene compound of the formula: with a dehydrogenation catalyst under conditions effective to produce a dehydrogenation reaction product comprising at least one methyl-substituted biphenyl compound wherein each of m and n is independently an integer from 1 to 3, wherein the conditions in (a) include a temperature from about 200° C. to about 600° C. and a pressure from about 100 kPa to about 3550 kPa; and wherein the dehydrogenation catalyst comprises an element or compound thereof from Group 10 of the Periodic Table of Elements and tin or a tin-based compound dispersed on a refractory support, wherein the refractory support has one or more of the following properties: (i) an alpha value between 0.1 to 10;(ii) a combined Bronsted and Lewis acid activity from 0.1 to 0.5 mmol/gm of the dehydrogenation catalyst; and(iii) a temperature programmed ammonia adsorption from 0.1 to 1 mmol/gm of the dehydrogenation catalyst. 2. The process of claim 1, wherein each of m and n is 1. 3. The process of claim 1, wherein the refractory support comprises alumina. 4. The process of claim 1, wherein the dehydrogenation catalyst contains less than 1 wt % of said element or compound thereof from Group 10 of the Periodic Table of Elements. 5. A process for producing methyl-substituted biphenyl compounds, the process comprising: (a) contacting a feed comprising at least one aromatic hydrocarbon selected from the group consisting of toluene, xylene and mixtures thereof with hydrogen in the presence of a hydroalkylation catalyst under conditions effective to produce a hydroalkylation reaction product comprising (methylcyclohexyl)toluenes and/or (dimethylcyclohexyl)xylenes; and(b) dehydrogenating at least part of the hydroalkylation reaction product in the presence of a dehydrogenation catalyst under conditions effective to produce a dehydrogenation reaction product comprising a mixture of methyl-substituted biphenyl compounds, wherein the conditions in (b) include a temperature from about 200° C. to about 600° C. and a pressure from about 100 kPa to about 3550 kPa, and wherein the dehydrogenation catalyst comprises an element or compound thereof from Group 10 of the Periodic Table of Elements and tin or a tin-based compound dispersed on a refractory support, wherein the refractory support has one or more of the following properties:(i) an alpha value between 0.1 to 10;(ii) a combined Bronsted and Lewis acid activity from 0.1 to 0.5 mmol/gm of the dehydrogenation catalyst; and(iii) a temperature programmed ammonia adsorption from 0.1 to 1 mmol/gm of the dehydrogenation catalyst. 6. The process of claim 5, wherein the hydroalkylation catalyst comprises an acidic component and a hydrogenation component. 7. The process of claim 6, wherein the acidic component of the hydroalkylation catalyst comprises a molecular sieve. 8. The process of claim 7, wherein the molecular sieve comprises a molecular sieve of the MCM-22 family. 9. The process of claim 6, wherein the hydrogenation component of the hydroalkylation catalyst is selected from the group consisting of palladium, ruthenium, nickel, zinc, tin, cobalt and compounds and mixtures thereof. 10. The process of claim 5, wherein the hydroalkylation conditions in the contacting (a) include a temperature from about 100° C. to about 400° C. and a pressure from about 100 to about 7,000 kPa. 11. The process of claim 5, wherein the aromatic hydrocarbon comprises toluene. 12. The process of claim 5, wherein the feed to (a) further comprises benzene and/or at least one alkylbenzene different from toluene and xylene. 13. The process of claim 5, wherein the refractory acidic support of the dehydrogenation catalyst comprises alumina. 14. The process of claim 5, wherein the dehydrogenation catalyst contains less than 1 wt % of said element or compound thereof from Group 10 of the Periodic Table of Elements. 15. A process for producing biphenyl esters, the process comprising: (a) contacting a feed comprising at least one aromatic hydrocarbon selected from the group consisting of toluene, xylene and mixtures thereof with hydrogen in the presence of a hydroalkylation catalyst under conditions effective to produce a hydroalkylation reaction product comprising (methylcyclohexyl)toluenes and/or (dimethylcyclohexyl)xylenes ;(b) dehydrogenating at least part of the hydroalkylation reaction product in the presence of a dehydrogenation catalyst under conditions effective to produce a dehydrogenation reaction product comprising a mixture of methyl-substituted biphenyl compounds, wherein the dehydrogenation catalyst comprises an element or compound thereof from Group 10 of the Periodic Table of Elements and tin or a tin-based compound dispersed on a refractory support, wherein the refractory support has one or more of the following properties:(i) an alpha value between 0.1 to 10;(ii) a combined Bronsted and Lewis acid activity from 0.1 to 0.5 mmol/gm of the dehydrogenation catalyst; and(iii) a temperature programmed ammonia adsorption from 0.1 to 1 mmol/gm of the dehydrogenation catalyst;(c) contacting at least part of the dehydrogenation reaction product with an oxygen source under conditions effective to convert at least part of the methyl-substituted biphenyl compounds to biphenyl carboxylic acids; and(d) reacting the biphenyl carboxylic acids with one or more C4 to C14 alcohols under conditions effective to produce biphenyl esters. 16. The process of claim 15, wherein the hydroalkylation catalyst comprises an acidic component and a hydrogenation component. 17. The process of claim 15, wherein the acidic component of the hydroalkylation catalyst comprises a molecular sieve of the MCM-22 family. 18. The process of claim 15, wherein the refractory acidic support of the dehydrogenation catalyst comprises alumina. 19. The process of claim 5, wherein unreacted aromatic feed is removed from the hydroalkylation reaction product of step a) and recycled back to the hydroalkylation of step a). 20. The process of claim 5, wherein toluene and or xylene feed is removed from the hydroalkylation reaction product of step a) and recycled back to the hydroalkylation of step a). 21. The process of claim 5 wherein fully saturated single ring by-products in the hydroalkylation reaction product of step a) are dehydrogenated to produce recyclable feed that is recycled back to the hydroalkylation of step a). 22. The process of claim 5 wherein methylcyclohexane and dimethylcyclohexane in the hydroalkylation reaction product of step a) are dehydrogenated to produce recyclable feed that is recycled back to the hydroalkylation of step a). 23. The process of claim 5, wherein unreacted aromatic feed is removed from the hydroalkylation reaction product of step a) and recycled back to the hydroalkylation of step a), and wherein fully saturated single ring by-products in the hydroalkylation reaction product of step a) are dehydrogenated to produce recyclable feed that is recycled back to the hydroalkylation of step a). 24. The process of claim 5, wherein toluene and or xylene feed is removed from the hydroalkylation reaction product of step a) and recycled back to the hydroalkylation of step a), and wherein methylcyclohexane and dimethylcyclohexane in the hydroalkylation reaction product of step a) are dehydrogenated to produce recyclable feed that is recycled back to the hydroalkylation of step a). 25. The process of claim 15, wherein unreacted aromatic feed is removed from the hydroalkylation reaction product of step a) and recycled back to the hydroalkylation of step a), and wherein fully saturated single ring by-products in the hydroalkylation reaction product of step a) are dehydrogenated to produce recyclable feed that is recycled back to the hydroalkylation of step a). 26. The process of claim 15, wherein toluene and or xylene feed is removed from the hydroalkylation reaction product of step a) and recycled back to the hydroalkylation of step a), and wherein methylcyclohexane and dimethylcyclohexane in the hydroalkylation reaction product of step a) are dehydrogenated to produce recyclable feed that is recycled back to the hydroalkylation of step a).