Abstract
Most of the current commercial production of glacial acetic acid (GAA) is by petrochemical routes, primarily methanol carbonylation. GAA is an intermediate in the production of plastics, textiles, dyes, and paints. GAA production from biomass might be an economically viable and sustainable alternative to petroleum-derived routes. Separation of acetic acid from water is a major expense and requires considerable energy. This study evaluates and compares the technical and economic feasibility of GAA production via bioconversion using either ethyl acetate or alamine in diisobutylkerosene (DIBK) as organic solvents for purification. Models of a GAA biorefinery with a production of 120,650 tons/year were simulated in Aspen software. This biorefinery follows the path of pretreatment, enzymatic hydrolysis, acetogen fermentation, and acid purification. Estimated capital costs for different scenarios ranged from USD 186 to 245 million. Recovery of GGA using alamine/DIBK was a more economical process and consumed 64% less energy, due to lower steam demand in the recovery distillation columns. The estimated average minimum selling prices of GGA were USD 756 and 877/ton for alamine/DIBK and ethyl acetate scenarios, respectively. This work establishes a feasible and sustainable approach to produce GGA from poplar biomass via fermentation.
Highlights
There is considerable interest in biorefining strategies converting biomass into biofuels and platform chemicals
Several bio-based chemicals have been proposed as alternatives of petroleum-based chemicals, including organic acids, lactic acid [3], acetic acid [4], and itaconic acid [1]; polymers [5], polylactide [6], polyhydroxyalkanote [7], and starch-based polymers [8]); diols [9,10], and sugar-based alcohols
The composition by dry mass assumed for the biomass entering the biorefinery, which falls within ranges given in the literature [39,42], is cellulose (42%), hemicellulose (22.9%), and lignin (25.8%)
Summary
There is considerable interest in biorefining strategies converting biomass into biofuels and platform chemicals. These have been investigated with the goal of reducing greenhouse gas emissions and developing domestic industries, especially those that support rural communities. Production of platform chemicals from biomass offers a promising opportunity to reduce U.S dependence on imported oil, in addition to improving the overall economics and sustainability of integrated biorefineries [1]. In the case of organic acids, such as acetic and succinic acids, industrial separation, and purification from fermentation broths needs further improvement to be economically viable [2,12]
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