Recovery of acetic acid from pre-hydrolysis liquor of hardwood kraft-based dissolving pulp production process by reactive extraction with triisooctylamine

•Acetic acid was recovered from the PHL by reactive extraction with triisooctylamine.•Diluent played an important role in recovering acetic acid from the PHL.•Temperature and pH negatively affected the acetic acid extraction.•Acetic acid concentration positively affected the acetic acid extraction....

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Bibliographic Details
Published in:Bioresource technology 2013-06, Vol.138, p.253-258
Main Authors: Yang, G., Jahan, M. Sarwar, Ahsan, Laboni, Zheng, Linqiang, Ni, Yonghao
Format: Article
Language:English
Subjects:
Acetic acid
Acetic Acid - isolation & purification
Amines - chemistry
Biological and medical sciences
Biotechnology - methods
Charcoal - chemistry
Decanol
dissociation
Dissolution
dissolving pulp
Distribution coefficient
Extraction
Fatty Alcohols - chemistry
Fundamental and applied biological sciences. Psychology
hardwood
Hardwoods
Hydrogen-Ion Concentration
Hydrolysis
Industrial Waste - analysis
Lignin - chemistry
Pre-hydrolysis liquor
Reactive extraction
Recovery
Temperature
Time Factors
Titanium dioxide
Triisooctylamine
Wood - chemistry
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Summary:•Acetic acid was recovered from the PHL by reactive extraction with triisooctylamine.•Diluent played an important role in recovering acetic acid from the PHL.•Temperature and pH negatively affected the acetic acid extraction.•Acetic acid concentration positively affected the acetic acid extraction. Acetic acid was one of the main compositions of the pre-hydrolysis liquor (PHL), which was recovered by reactive extraction with triisooctylamine (TIOA) diluted with decanol. Dilution of TIOA played an important role in extracting acetic acid from the PHL. The recovery of acetic acid from the PHL by TIOA was increased from 10.34% to 66.60% with the dilution of TIOA to 20% by decanol at the HAc to TIOA molar ratio of 1, consequently, the equilibrium distribution coefficient KD increased. The effects of time, temperature and pH on the extraction process were also studied. The extraction process was very fast. The acetic acid extraction decreased from 65.13% to 57.34% with the rise of temperature to 50°C from 20°C. A higher pH increased the dissociation of acetic acid, as a result, decreased acetic acid extraction. The hemicelluloses in the PHL were unaffected on the extraction process of acetic acid.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2013.03.164