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There are several problems in the existed furfural production process, such as serious waste gas pollution and energy waste, basing on the existed furfural production process, this paper researched the waste gas separation process, selected suitable solvent, optimized the process for pilot test, analyzed energy utilize for more economical energy utilize process measures.Waste gas condensate mainly includes methanol and acetone, methanol and acetone could form azeotrope. This paper selected extractive distillation for azeotrope separation. The key point is solvent selection, this paper researched several solvents about selectivity, solubility, boiling point, viscosity, specific thermal capacity and toxicity by fuzzy comprehensive evaluation, and selected water as solvent basing on the maximum subordination principle.This paper simulated waste gas separation process by under given separation task, and analyzed theoretical plate number, feeding location, solvent ratio, reflux ratio, feeding temperature to determine the optimum value.Experimental device was established for waste gas separation process on the base of simulation. The experimental results apply well with the simulation results, this process could separate methanol and acetone, also achieve separation task and emission target.The heat load of furfural refining process was analyzed on the base of existed process simulation, this paper recovered energy of furfural vapor to produce steam with waste heat boiler, the steam could be supplied to primary tower and extractive distillation column. Compared with the existed process, this measure could increase energy utilization ratio from initial 43.44% to final 61.5%, protect primary tower from acid corrosion and blocking phenomenon, also control waste gas emission without extra energy consumption from column bottom.
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