Fig. 2From: Butadiene sulfone as ‘volatile’, recyclable dipolar, aprotic solvent for conducting substitution and cycloaddition reactionsDiagram showing the experimental setup for the recycle of sulfolene solvents. V-1 to V-6 are needle valves, V-7 is pressure relief valve, R-1 is the decomposition reactor, R-2 is the reformation reactor and B-1 is a bubbler submerged in a base bath used to neutralize excess SO2 Back to article page