Trimethylolpropane (TMP, IUPAC name 2-(hydroxymethyl)-2-ethylpropane-1,3-diol) and its ethoxylated derivatives are extensively used as precursors for urethanes and polyester resins. 

CWB Technology

CWB process uses a special heterogeneous catalyst to catalyze the cross-aldol reaction between formaldehyde and n-butyraldehyde to give intermediate 2,2-bis(hydroxymethyl)butanal (DMB) and then carry out catalytic hydrogenation on DMB to produce high purity Trimethylolpropane (TMP).

Process Highlights:

  • CWB patented process.
  • Aldol reaction
    • Special and highly selective heterogeneous catalyst will be used to drive the aldol reaction between formaldehyde and n-butyraldehyde.
      • High selectivity to TMP without producing formate salt by-products.
      • Optimised feed ratio of formaldehyde/n-butyraldehyde to minimise by-product production.
    • Low formaldehyde consumption
    • Effective formaldehyde recovery
      • Losses of formaldehyde due to conversion to methanol in the hydrogenation reaction can be reduced.
    • No tedious catalyst separation step will be involved after aldol reaction.
  • Hydrogenation reaction
    • A highly selective, low cost, Cr-free based hydrogenation catalyst will be used to give the best hydrogenation performance of DMB to TMP, without sacrificing the reaction yield. 
    • Replace energy intensive distillation with crystallisation as the TMP purification method.


  • More competitive formaldehyde and n-butyraldehyde consumption than other existing processes. 
  • Lower formaldehyde consumption leads to a lower waste water production.
  • High cost for chromium waste treatment will be eliminated.
  • The entire technology is expected to be highly scaleable. Suitable for either small scale or industrial scale of production. 
  • Energy consumption through heat integration and optimised purification process (cyrtsllization) will be reduced.

Safety and Environment:

  • Cr-free hydrogenation catalyst is used, no chromium wastes will be produced.
  • Overall side reactions are minimised and less valuable materials will be lost from purging. 

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