Title: The effect of continuous tubular reactor technologies on the pretreatment of lignocellulosic biomass at pilot-scale for bioethanol production

Abstract

A pilot-scale continuous tubular reactor (PCTR) was employed for the isothermal pretreatment of agave bagasse (AG), corn stover (CS), sugarcane bagasse (SC), and wheat straw (WS) with three residence times. The objective was to evaluate the impact of this technology on enzymatic saccharification at low solid loadings (4% w/v) and on sequential saccharification and glucose fermentation (SSF) at high solid loading (20% w/v) for bioethanol production. Deformation in cellulose and hemicellulose linkages and xylan removal of up to 60% were achieved after pretreatment. The shortest residence time tested (20 min) resulted in the highest glucan to glucose conversion in the low solid loading (4% w/v) enzymatic saccharification step for AG (83.3%), WS (82.8%), CS (76.1%) and SC (51.8%). Final ethanol concentrations after SSF from PCTR-pretreated biomass were in the range of 38 to 42 g L^–1 (11.0–11.3 kg of ethanol per 100 kg of untreated biomass). Additionally, PCTR performance in terms of xylan removal and sugar release were compared with those from a batch lab-scale autohydrolysis reactor (BLR) under the same process conditions. BLR removed higher xylan amounts than those achieved in the PCTR. However, higher sugar concentrations were obtained with PCTR for SC (13.2 g L^–1 vs. 10.5 gmore » L^–1) and WS (21.7 g L^–1 vs. 18.8 g L^–1), whilst differences were not significant (p < 0.05) with BLR for AG (16.0 g L^–1 vs. 16.3 g L^–1) and CS (18.7 g L^–1 vs. 18.4 g L^–1).« less

Authors:

Pérez-Pimienta, José A.  ^[1];

• Search DOE PAGES for author "Pérez-Pimienta, José A."
• Search DOE PAGES for ORCID "0000-0002-1370-8716"

Papa, Gabriela ^[2]; Gladden, John M.  ^[2];

• Search DOE PAGES for author "Gladden, John M."
• Search DOE PAGES for ORCID "0000-0002-6985-2485"

Simmons, Blake A.  ^[2];

• Search DOE PAGES for author "Simmons, Blake A."
• Search DOE PAGES for ORCID "0000-0002-1332-1810"

Sanchez, Arturo  ^[1]

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• Search DOE PAGES for ORCID "0000-0001-5453-0478"

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+ Show Author Affiliations

1. Laboratorio de Futuros en Bioenergía, Unidad Guadalajara de Ingeniería Avanzada, Centro de Investigación y Estudios Avanzados (CINVESTAV), Zapopan, Mexico
2. Joint BioEnergy Institute, Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Emeryville, USA

Publication Date:

Tue May 12 00:00:00 EDT 2020

Research Org.:

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Biological and Environmental Research (BER); Mexican Secretary of Energy

OSTI Identifier:

1618185

Alternate Identifier(s):

OSTI ID: 1760249

Grant/Contract Number:  

AC02-05CH11231; 249564

Resource Type:

Published Article

Journal Name:

RSC Advances

Additional Journal Information:

Journal Name: RSC Advances Journal Volume: 10 Journal Issue: 31; Journal ID: ISSN 2046-2069

Publisher:

Royal Society of Chemistry

Country of Publication:

United Kingdom

Language:

English

Subject:

09 BIOMASS FUELS