Patent ID: 6093285
Filing Date: 2000-07-25
Classification: B01D,B01J,C07C,Y10S

Abstract:
A purification process for purifying a 1,3-butadiene feedstock comprising 1,3-butadiene, water, a polymerization inhibitor, and at least one heavy impurity, comprising the steps of:separating said 1,3-butadiene feedstock, employing a separation column defining a separation zone having an upper portion and a lower portion, into an overhead stream comprising water, a bottoms stream comprising at least one heavy impurity and a polymerization inhibitor, and a vapor side draw stream comprising 1,3-butadiene and residual impurities;reboiling at least a portion of said bottoms stream to form a boil-up vapor stream and a bottoms residue stream for return of said boil-up vapor stream to said lower portion;condensing at least a portion of said overhead stream to form a condensed overhead stream;forming a water phase and a hydrocarbon phase from said condensed overhead stream;refluxing said hydrocarbon phase to said separation zone;charging a slip stream of said bottoms residue stream into said overhead stream prior to condensing said at least a portion of said overhead stream;condensing said vapor side draw stream to form an intermediate product stream; andremoving at least a portion of said residual impurities from said intermediate product stream to form a purified 1,3-butadiene stream.