Cyclohexanedimethanol (CHDM) is a mixture of isomeric organic compounds with formula C6H10(CH2OH)2. It is a colorless low-melting solid used in the production of polyester resins. Commercial samples consist of a mixture of cis and trans isomers. It is a di-substituted derivative of cyclohexane and is classified as a diol.

CWB CHDM Technology

CWB process enables the direct hydrogenation of terephthalic acid (TPA) to 1,4-cyclohexanedicarboxylic acid (CHDA) to avoid an extra esterification step (TPA->DMT). Subsequent hydrogenation of CHDA yields CHDM. CWB proprietary catalysts give high yield of CHDM with standard cis/trans ratio (~3:7). 

Process Highlights:

  • Direct hydrogenation of TPA, extra esterification step (TPA->DMT) is avoid.
  • Proprietary catalyst is used for a high selectivity hydrogenation reactions. 
  • Industrial standard cis/train ratio CHDM are guaranteed. Quality of CHDM is assured through bench polymerisation testing. 
  • Water is the only solvent. No organic solvents will be used. 
  • Mild hydrogenation conditions, lower in operation pressure and temperature compared to existing DMT method. 
  • No methanol waste is generated (no esterification involved).

Economics: 

  • Competitive raw material (TPA-based) to other CHDM production process.
  • Mild hydrogenation conditions, lower in operation pressure and temperature (Compare to DMT route). Lower in capital investment. 
  • Reduced energy consumption through heat integration and optimised purification process. 

Safety and Environment: 

  • Reduced risk in operation due to the reduced hydrogenation operating pressure.
  • No toxic methanol waste is generated. By products are mainly water. 

 For more information regarding CWB CHDM technology, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it..