Process integration studies on Kraft pulp-mill-based biorefineries producing ethanol

摘要: Large scale, sustainable production of biofuels will require commercialization of processes using lignocellulosic feedstocks. These processes are still not competitive with existing pathways, however. The competitiveness of lignocellulosic biofuel plants could potentially be improved if they were integrated already facilities. One such example being explored currently is connected to the fact that pulping industry showing a growing interest in expanding their product portfolio, namely complete or partial conversion pulp mills into biorefineries for transport fuels. The objective work presented this thesis has been study different potential biorefinery concepts chemical pulping, and more specifically Kraft process. Three different process combinations have been assessed project; where mill repurposed to ethanol (no produced), ethanol dimethyl- ether produced mill, finally process where an plant co-located modern mill. The findings from studies reveal increasing degree heat integration leads lower cost both based on a repurposed mill. In ethanoland di-methyl-ether process, which much higher conversion efficiency from feedstock than other processes, it was shown could be competitive terms cost, the biofuel price high perceived as low risk investment.