Crude fatty alcohol is refined to produce high-quality product in a single distillation column.
Subsequent polishing converts any residual carbonyls (principally aldehydes) in the product to alcohols.
Other intermediates and by-products are recycled for re-use in the process or used as fuel.
The Davy NDA process can also operate with non-acidic methyl esters fed directly to the hydrogenolysis stage, bypassing the esterification step.
This offers our licensees the option of using alternative feedstocks, depending on availability.
The Davy NDA process is normally optimised for C12/C14 production, but it is possible to switch to C8/C10 or C16/18 production on a continuous or campaign basis, as required.
An alternative production route for the hydrogen required for hydrogenolysis is to use the methanol/water stream from esterification to feed a methanol reformer package.
The offgas can be used as fuel within the package. This reduces the size of the methanol recovery column and eliminates the waste water stream.