Fatty Alcohols

Fatty acids Esterification

The Davy esterification system is a simple continuous process that is used for esterification of natural and petrochemical acids. the process uses reactive distillation to produce an ester product that can be hydrogenated directly without any further processing. The solid resin catalyst is retained on the reaction trays, and so does not contaminate the methyl ester product. The catalyst can also be replaced while the plant is online.

Methylester Hydrogenation

Methyl esters are pumped to the hydrogenation reaction pressure of around 40 bar and fed into the hydrogenation vaporiser. The feed liquid is vaporised by a hydrogen-rich gas stream which passes up through the vaporiser.

The overheads from the hydrogenation vaporiser are fed to the hydrogenation reactor containing a fixed bed of catalyst. The reaction occurs in the vapour phase in a stream of excess hydrogen. The mild operating conditions of the Davy hydro-genation process along with uniform temperature and short residence in the reactor results in a very highly selective process. This high process selectivity results in minimal byproduct formation and hence high quality endproducts.

Fatty Alcohol Refining

Unconverted esters are separated and recycled back to the hydrogenation section. Residual methanol is recovered and recycled, and a light ends purge is taken if necessary to achieve the required product alkane specification. The column is run under vacuum and a falling film vaporiser used for the reboiler to prevent thermal degradation of the product. Heavy boiling bottom stream is recycled back to the hydrogenation section.