The effect of high solids loading in ethanol production integrated with a pulp mill

Svensson, Elin,1980Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden (author)

In this paper, two ethanol processes integrated with a softwood pulp mill are compared with regard to their steam demand, process integration potential and profitability. The processes differ in the solids loading in the simultaneous saccharification and fermentation step and in the resulting ethanol concentration. The results show that a higher ethanol concentration does not necessarily lead to significant reductions in steam demand. Instead, it is demonstrated that the steam demand for distillation is highly dependent on the design of the distillation plant. Nevertheless, a higher solids loading (high gravity) can be beneficial for the treatment of the stillage from the distillation plant. A higher solids loading results either in a lower steam demand for evaporation of the stillage or possibly in a reduced demand for effluent treatment compared to a conventional solids loading process. While the results show that a higher ethanol concentration leads to advantages in energy costs and investment costs for the distillation plant, they also show that the potential benefits of a high-gravity process are offset by the expected decrease in ethanol yield, which leads to higher raw material costs. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

TEKNIK OCH TEKNOLOGIER Kemiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Pappers-, massa- och fiberteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Paper, Pulp and Fiber Technology hsv//eng
biomass
corn stover
saccharification
High gravity
Techno-economic assessment
softwood
energy efficiency
Biorefinery
wood
Engineering
fermentation
Pulp mill
Ethanol
Pinch analysis
lignocellulosic ethanol
simultaneous
pretreatment
enzymatic-hydrolysis

Lundberg, Valeria,1984RISE,Innventia,Chalmers University of Technology, Sweden(Swepub:ri)valeria.lundberg@ri.se (author)
Jansson, M.RISE,Innventia (author)
Xiros, Charilaos,1973Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden(Swepub:ri)charilaosxi@ri.se (author)
Berntsson, Thore,1947Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden(Swepub:cth)thore (author)
Chalmers tekniska högskolaChalmers University of Technology, Sweden (creator_code:org_t)

In:Chemical Engineering Research and Design: Elsevier BV111, s. 387-4020263-87621744-3563

By the author/editor: Svensson, Elin, ...; Lundberg, Valeri ...; Jansson, M.; Xiros, Charilaos ...; Berntsson, Thore ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Paper Pulp and F ...

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