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Simulation and design of distillation units for treatment of sulfite pulping condensates to recover methanol and furfural: Part II: Applicability of multiple‐effect distillation using live steam
Author(s) -
Aly G.,
Zacchi G.
Publication year - 1979
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450570312
Subject(s) - distillation , furfural , methanol , process engineering , steam distillation , waste management , reboiler , environmental science , pulp and paper industry , chemistry , engineering , chromatography , organic chemistry , catalysis
Abstract A distillation unit has been designed for a capacity of 73 t/h of condensate and for at least 90% recovery of the contaminating organics. This unit consists of three columns: a primary stripper to remove volatile organics and two upgrading columns to purify the methanol and furfural byproducts. Three different energy‐saving alternatives for satisfying the energy requirements have been studied: utilisation of secondary steam from the evaporation plant, and application of the principle of multi‐effect distillation in one‐stripper and in two‐stripper configurations. Investment cost needed in all alternatives amounts to 5.5–6.0 MCr (millions of Swedish Crowns) while operating cost varies between 0.8–3.1 MCr. The first design alternative has a payoff period of 2.3 years while the two multi‐effect distillation alternatives have a payoff period of about 3 years.