Patent ID: 9006471
Filing Date: 2015-04-14
Classification: B01D,C07D,Y02P

Abstract:
1. Process for the production of furfural from pentoses and/or water soluble pentosans, said process comprising converting the said pentoses and/or water soluble pentosans in aqueous solution in a first step to furfural under acidic conditions and in a second step feeding the aqueous solution containing furfural obtained in the first step to the top of a distillation column to produce an aqueous, liquid downflow, in which liquid downflow at least one acidic material is present in an amount of at most 0.5 N and which liquid additionally contains at least one salt selected from the group of alkali, earth alkaline and ammonium halides, which column is heated at the bottom part thereof, using at least one reboiler to produce an upflow steam flow, recovering a water and furfural containing vapour product stream from the top of the said column, compressing the said vapour flow and condensing it on the hot side of the reboiler at the bottom of the said column to produce sufficient steam in the said bottom part of the column to produce the said upflow steam flow, and to recover an aqueous furfural containing solution as the condensate in the reboiler.