Separation process with modified enhanced hot separator system

摘要

A separation process with a modified enhanced hot separator system is described. The process eliminates undesirable entrainment while allowing for enhanced stripping of the net liquid only. The modified enhanced hot separator system combines a hot separator with a hot stripping column.

主权项

1. A process for producing biofuel from renewable feedstocks, the process comprising:
deoxygenating the renewable feedstocks in a deoxygenation reaction zone, separating the deoxygenation reaction zone effluent in a first vapor-liquid separator into a vapor stream and a liquid stream wherein the first vapor-liquid separator is operated at a temperature from about 40 C to about 350 C; dividing the liquid stream into a recycle portion and a product portion; stripping the product portion of the liquid stream in a stripping column with a stripping gas into an overhead vapor stream and a bottoms stream wherein a level of contaminants in the bottoms stream of the stripping column after the first vapor-liquid separator is less than 1/100 of a level of contaminants in a bottoms stream of a stripping column without a vapor-liquid separator, and wherein the stripping column is operated at a temperature of from about 50 C to about 350 C; isomerizing the bottoms stream of the stripping column in an isomerization reaction zone; recycling the recycle portion of the liquid stream to the deoxygenation reaction zone; fractionating at least a portion of an effluent of the isomerization reaction zone to form at least one biofuel product stream.