The effect of high solids loading in ethanol production integrated with a pulp mill
Artikel i vetenskaplig tidskrift, 2016

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.

Pinch analysis

pretreatment

softwood

High gravity

biomass

Pulp mill

simultaneous

Techno-economic assessment

lignocellulosic ethanol

saccharification

energy efficiency

Ethanol

corn stover

Engineering

Biorefinery

wood

fermentation

enzymatic-hydrolysis

Författare

Elin Svensson

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

Valeria Lundberg

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

M. Jansson

INNVENTIA AB

Charilaos Xiros

Chalmers, Biologi och bioteknik, Industriell bioteknik

Thore Berntsson

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

Chemical Engineering Research and Design

0263-8762 (ISSN) 1744-3563 (eISSN)

Vol. 111 387-402

Ämneskategorier

Kemiteknik

DOI

10.1016/j.cherd.2016.05.026