Method for preparing dimethyl 1,4-cyclohexanedicarboxylate and method for preparing 1,4-cyclohexanedimethanol
View Patent ↗A method for preparing dimethyl 1,4-cyclohexanedicarboxylate (DMCD) is provided. The method includes hydrogenating dimethyl terephthalate (DMT) under a condition of a pressure of 20 to 30 kg/cm 2 to continuously prepare the DMCD, and thereby increasing the selectivity of the DMCD. A method for preparing 1,4-cyclohexanedimethanol (CHDM) is further provided.
1. A method for preparing dimethyl 1,4-cyclohexanedicarboxylate (DMCD), comprising: hydrogenating dimethyl terephthalate (DMT) in a reactor containing a Ru/Al 2 O 3 catalyst to continuously form the DMCD, wherein a pressure in the reactor is from 20 to 30 kg/cm 2 , and a liquid hourly space velocity (LHSV) of the DMT is from 2 to 8 hours −1 .
2. The method of claim 1 , wherein the reactor is a fixed-bed reactor.
3. The method of claim 1 , wherein the DMT is dissolved in a solvent.
4. The method of claim 3 , wherein the solvent is at least one selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate and butyl acetate.
5. The method of claim 1 , wherein the step of hydrogenating is conducted at a temperature of from 100 to 180° C.
6. The method of claim 1 , wherein the step of hydrogenating is conducted at a temperature of from 120 to 160° C.
7. A method for preparing 1,4-cyclohexanedimethanol (CHDM), comprising: hydrogenating dimethyl terephthalate (DMT) in a first reactor containing a Ru/Al 2 O 3 catalyst to continuously form the dimethyl 1,4-cyclohexanedicarboxylate (DMCD), wherein a pressure in the first reactor is from 20 to 30 kg/cm 2 , and a liquid hourly space velocity (LHSV) of DMT is from 2 to 8 hours −1 ; and
charging the DMCD into a second reactor to hydrogenate an ester group of the DMCD.
8. The method of claim 7 , wherein the first reactor is a fixed-bed reactor.
9. The method of claim 7 , wherein the DMT is dissolved in a solvent.
10. The method of claim 9 , wherein the solvent is at least one selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, and butyl acetate.
11. The method of claim 7 , wherein the step of hydrogenating in the first reactor is conducted at a temperature of from 100 to 180° C.
12. The method of claim 7 , wherein the step of hydrogenating in the first reactor is conducted at a temperature of from 120 to 160° C.