| Reducing acid in dilute acid pretreatment and the impact on enzymatic saccharification. | |
| | |
MedLine Citation:
|
PMID: 22167347 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Dilute acid pretreatment is a leading pretreatment technology for biomass to ethanol conversion due to the comparatively low chemical cost and effective hemicellulose solubilization. The conventional dilute acid pretreatment processes use relatively large quantities of sulfuric acid and require alkali for pH adjustment afterwards. Significant amounts of sulfate salts are generated as by-products, which have to be properly treated before disposal. Wastewater treatment is an expensive, yet indispensable part of commercial level biomass-to-ethanol plants. Therefore, reducing acid use to the lowest level possible would be of great interest to the emerging biomass-to-ethanol industry. In this study, a dilute acid pretreatment process was developed for the pretreatment of corn stover. The pretreatment was conducted at lower acid levels than the conventional process reported in the literature while using longer residence times. The study indicates that a 50% reduction in acid consumption can be achieved without compromising pretreatment efficiency when the pretreatment time was extended from 1-5 min to 15-20 min. To avoid undesirable sugar degradation and inhibitor generation, temperatures should be controlled below 170°C. When the sulfuric acid-to-lignocellulosic biomass ratio was kept at 0.025 g acid/g dry biomass, a cellulose-to-glucose conversion of 72.7% can be achieved at an enzyme loading of 0.016 g/g corn stover. It was also found that acid loading based on total solids (g acid/g dry biomass) governs the pretreatment efficiency rather than the acid concentration (g acid/g pretreatment liquid). While the acid loading on lignocellulosic biomass may be achieved through various combinations of solids loading and acid concentration in the pretreatment step, this work shows that it is unlikely to reduce acid use without undermining pretreatment efficiency simply by increasing the solid content in pretreatment reactors, therefore acid loading on biomass is indicated to be the key factor in effective dilute acid pretreatment. |
| | |
Authors:
|
Ye Chen; Mark A Stevens; Yongming Zhu; Jason Holmes; Geoffrey Moxley; Hui Xu |
Related Documents
:
|
5664127 - Production of nucleic acid-related substances by fermentative processes. xix. accumulat... 2341647 - Enumeration and confirmation of clostridium tyrobutyricum in silages using neutral red,... 18351077 - Effects of pharmaceutically active compounds on a mixed microbial community originating... 14455467 - Calcium dipicolinic acid-induced germination of bacillus cereus spores. 20630207 - Proteolysis, lipolysis, volatile compounds, texture, and flavor of hispánico cheese ma... 11827807 - Acid survival of helicobacter pylori: how does urease activity trigger cytoplasmic ph h... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-12-14 |
Journal Detail:
|
Title: Journal of industrial microbiology & biotechnology Volume: - ISSN: 1476-5535 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
|
Created Date: 2011-12-14 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9705544 Medline TA: J Ind Microbiol Biotechnol Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
Novozymes North America, Franklinton, NC, 27525, USA, yech@novozymes.com. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Genetic Polymorphisms of the Wnt Receptor LRP5 are Differentially Associated with Trochanteric and C...
Next Document: Orthostatic Hypotension Following Resection of a Dorsal Medullary Hemangioblastoma.