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Title: Recycling of Dilute Deacetylation Black Liquor to Enable Efficient Recovery and Reuse of Spent Chemicals and Biomass Pretreatment Waste

Abstract

Deacetylation/dilute alkaline pretreatment followed by mechanical refining (DMR) has been proven as an effective process for biomass sugar liberation without severe chemical modification to lignin. Previous research has been focused on optimizing deacetylation conditions, reducing energy consumptions in mechanical refining, and improving sugar yields and titers in enzymatic hydrolysis. To successfully commercialize this process, another critical challenge is to develop a robust process to balance water usage, recover spent chemicals, and utilize waste carbons from the dilute deacetylation waste liquor. In this work, a new process modification and strategy is pioneered to recycle and reuse the weak black liquor (WBL) in order to reduce water, chemical, and energy usage while increasing both inorganic and organic contents in the WBLto facilitate downstream processing. Results suggest that the accumulation did not lower acetyl and lignin removal in alkaline pretreatment, resulting in comparable sugar yields in enzymatic hydrolysis. Sodium and potassium were found to be the two most important inorganic compounds in the recycled WBL. Moreover, the accumulated sodium and phenolic compounds did not inhibit the downstream ethanol fermentation processes. Finally, techno-economic analysis (TEA) showed a decrease in the minimum ethanol selling price (MESP) by ~5 to 15 cents per gallon of ethanolmore » resulting from the inclusion of the recycling of weak black liquor when compared to a conventional non-recycling process.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). National Bioenergy Center
  2. Thermo Fisher Scientific, Lafayette, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
OSTI Identifier:
1454888
Alternate Identifier(s):
OSTI ID: 1462322
Report Number(s):
NREL/JA-5100-70802
Journal ID: ISSN 2296-598X
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Published Article
Journal Name:
Frontiers in Energy Research
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2296-598X
Publisher:
Frontiers Research Foundation
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; deacetylation and mechanical refining; DMR; black liquor recycling; bioethanol production; minimum ethanol selling price

Citation Formats

Chen, Xiaowen, Kuhn, Erik, Nagle, Nick, Nelson, Robert, Tao, Ling, Crawford, Nathan, and Tucker, Melvin. Recycling of Dilute Deacetylation Black Liquor to Enable Efficient Recovery and Reuse of Spent Chemicals and Biomass Pretreatment Waste. United States: N. p., 2018. Web. doi:10.3389/fenrg.2018.00051.
Chen, Xiaowen, Kuhn, Erik, Nagle, Nick, Nelson, Robert, Tao, Ling, Crawford, Nathan, & Tucker, Melvin. Recycling of Dilute Deacetylation Black Liquor to Enable Efficient Recovery and Reuse of Spent Chemicals and Biomass Pretreatment Waste. United States. doi:10.3389/fenrg.2018.00051.
Chen, Xiaowen, Kuhn, Erik, Nagle, Nick, Nelson, Robert, Tao, Ling, Crawford, Nathan, and Tucker, Melvin. Tue . "Recycling of Dilute Deacetylation Black Liquor to Enable Efficient Recovery and Reuse of Spent Chemicals and Biomass Pretreatment Waste". United States. doi:10.3389/fenrg.2018.00051.
@article{osti_1454888,
title = {Recycling of Dilute Deacetylation Black Liquor to Enable Efficient Recovery and Reuse of Spent Chemicals and Biomass Pretreatment Waste},
author = {Chen, Xiaowen and Kuhn, Erik and Nagle, Nick and Nelson, Robert and Tao, Ling and Crawford, Nathan and Tucker, Melvin},
abstractNote = {Deacetylation/dilute alkaline pretreatment followed by mechanical refining (DMR) has been proven as an effective process for biomass sugar liberation without severe chemical modification to lignin. Previous research has been focused on optimizing deacetylation conditions, reducing energy consumptions in mechanical refining, and improving sugar yields and titers in enzymatic hydrolysis. To successfully commercialize this process, another critical challenge is to develop a robust process to balance water usage, recover spent chemicals, and utilize waste carbons from the dilute deacetylation waste liquor. In this work, a new process modification and strategy is pioneered to recycle and reuse the weak black liquor (WBL) in order to reduce water, chemical, and energy usage while increasing both inorganic and organic contents in the WBLto facilitate downstream processing. Results suggest that the accumulation did not lower acetyl and lignin removal in alkaline pretreatment, resulting in comparable sugar yields in enzymatic hydrolysis. Sodium and potassium were found to be the two most important inorganic compounds in the recycled WBL. Moreover, the accumulated sodium and phenolic compounds did not inhibit the downstream ethanol fermentation processes. Finally, techno-economic analysis (TEA) showed a decrease in the minimum ethanol selling price (MESP) by ~5 to 15 cents per gallon of ethanol resulting from the inclusion of the recycling of weak black liquor when compared to a conventional non-recycling process.},
doi = {10.3389/fenrg.2018.00051},
journal = {Frontiers in Energy Research},
number = ,
volume = 6,
place = {United States},
year = {Tue Jun 19 00:00:00 EDT 2018},
month = {Tue Jun 19 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.3389/fenrg.2018.00051

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Works referenced in this record:

Dilute-Sulfuric Acid Pretreatment of Corn Stover in Pilot-Scale Reactor: Investigation of Yields, Kinetics, and Enzymatic Digestibilities of Solids
journal, January 2003

  • Schell, Daniel J.; Farmer, Jody; Newman, Millie
  • Applied Biochemistry and Biotechnology, Vol. 105, Issue 1-3, p. 69-86
  • DOI: 10.1385/ABAB:105:1-3:69