A techno-economic study of Polybutylene adipate terephthalate (PBAT) production from molasses in an integrated sugarcane biorefinery
FOOD AND BIOPRODUCTS PROCESSING(2024)
摘要
The feasibility of producing biobased Polybutylene adipate terephthalate (PBAT) or 1,4-butanediol (BDO) as a way for diversification of sugar production facilities, was investigated in this study. Two scenarios for biorefineries integrated into an existing sugarcane mill, were investigated: In scenario 1, the feedstock (A-molasses) was diverted to produce three different monomers, i.e., terephthalic acid (TPA), adipic acid (AA) and 1,4-butanediol (BDO) in stoichiometric ratios required for PBAT production. Scenario 2 investigated using all the feedstock to produce BDO as a final product, based on substantial market potential. The processes were simulated in Aspen Plus (R) to obtain mass and energy balances for equipment sizing and costing. Then a discounted cash flow method was used to calculate the internal rate of return (IRR). The results indicated that scenario 1 had higher energy usage (47.3 MJ/kg of PBAT) compared to scenario 2 (42.1 MJ/kg of BDO) as PBAT synthesis required TPA and AA monomers, produced in energy -intensive processes. Scenario 2 with an IRR of 34.4% had a better economic performance than Scenario 1 with 19.1% IRR, partly due to Scenario 1 having smaller production scales for monomers, suffering the negative effects of economies-of-scale. Although both scenarios were profitable, the sensitivity analysis indicated that Scenario 1 would remain profitable with either a 30% increase in total capital investment or a 30% decrease in operation time, while Scenario 2 would become unprofitable. The study has demonstrated that bio -based PBAT can be produced from molasses in a manner that is cost-competitive with current fossil -based market prices.
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关键词
PBAT,Biobased,Profitability,Minimum selling price,Polymerisation
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