Black liquor fractionation for biofuels production - A techno-economic assessment

作者：Mesfun Sennai^*; Lundgren Joakim; Grip Carl Erik; Toffolo Andrea; Nilsson Rasika Lasanthi Kudahettige; Rova Ulrika

来源：Bioresource Technology, 2014, 166: 508-517.

DOI：10.1016/j.biortech.2014.05.062

• Techno-economic analysis
• Black liquor fractionation
• Butanol fermentation
• Process integration
• Pulp and paper mill

The hemicelluloses fraction of black liquor is an underutilized resource in many chemical pulp mills. It is possible to extract and separate the lignin and hemicelluloses from the black liquor and use the hemicelluloses for biochemical conversion into biofuels and chemicals. Precipitation of the lignin from the black liquor would consequently decrease the thermal load on the recovery boiler, which is often referred to as a bottleneck for increased pulp production. The objective of this work is to techno-economically evaluate the production of sodium-free lignin as a solid fuel and butanol to be used as fossil gasoline replacement by fractionating black liquor. The hydrolysis and fermentation processes are modeled in Aspen Plus to analyze energy and material balances as well as to evaluate the plant economics. A mathematical model of an existing pulp and paper mill is used to analyze the effects on the energy performance of the mill subprocesses.

• 出版日期2014-8