A chemical engineering consultant for a large refinery complex has been asked to investigate the feasibility of manufacturing 1.44×10-2 kg/s of thiophane, an odorant made from a com- bination of tetrahydrofuran (THF) and hydrogen sulfide. The essential reaction is H₂C-CH2 H₂C-CH₂ + H₂S + H₂O H₁₂C CH2 H₂C CH2 The process consists essentially of the following steps: a. THF is vaporized and mixed with H2S in a ratio of 1.5 mol H2S to 1 mol THF and reacted over an alumina catalyst at an average temperature of 672 K and pressure of 207 kPa. b. Reaction vapors are cooled to 300 K and phase-separated. C. The noncondensable gases are removed and burned in a fume furnace while the crude thiophane is caustic-washed in a batch operation. d. The caustic-treated thiophane is then batch-distilled in a packed tower and sent to storage before eventual shipment to commercial use. e. Recoverable THF is recycled to the reactors from the batch column. f. The aqueous bottoms stream is stored for further processing in the plant. g. Carbon deposition on the catalyst is heavy (4 percent of the THF feed), and therefore provision for regeneration of the catalyst must be made.