Recovery of acetic acid from prehydrolysis liquor of kraft based hardwood dissolving pulp process

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dc.contributor.advisorNi, Yonghao
dc.contributor.authorAhsan, Laboni
dc.date.accessioned2023-03-01T16:26:11Z
dc.date.available2023-03-01T16:26:11Z
dc.date.issued2014
dc.date.updated2017-01-18T00:00:00Z
dc.description.abstractThe utilization of dissolved organics in the pre-hydrolysis liquor (PHL) for the production of value-added chemicals can open a biorefinery platform for kraft-based dissolving pulp mills. In this dissertation, it was focused on the recovery of acetic acid which is the second major component in the PHL. Three different chemical processes were studied to separate acetic acid from sugars and lignin: 1) Adsorption, 2) Reactive extraction and 3) Membrane filtration. The adsorption of acetic acid by activated carbon and tertiary amine based resin led to 98% of acetic acid recovery from Model solution (MAA) and 46% from carbon treated PHL (TPHL). For the reactive extraction, the Trioctyl amine (TOA)/octanol system had 80.48%, 61.84% and 63.53% of acetic acid recovery from MAA, PHL and TPHL respectively. Subsequently, acetic acid in the organic phase (TOA-octanol) was back extracted using a sodium hydroxide solution, while the solvent (TOA- octanol) was regenerated and recycled successfully. The third separation concept was applied using the strategy combined with activated carbon, nanofiltration (NF) and reverse osmosis (RO) processes. To reduce the fouling due to the lignin present, PHL was firstly subjected to activated carbon adsorption, then the treated PHL (TPHL) was passed through a nanofiltration (NF DK) membrane to retain and concentrate the sugars, and the permeate of acetic acid rich solution was passed through multistage reverse osmosis (RO SG) units. It showed a significant increase in the final concentration of dissolved organics: total sugar from 48 g/L to 227g/L and acetic acid from 10 g/L to 55 g/L. Therefore, it was concluded that the membrane process could be a better option than reactive extraction and adsorption process in terms of product quality, yield, cost, feasibility of operation and environment.
dc.description.copyrightNot available for use outside of the University of New Brunswick
dc.description.note(UNB thesis number) Thesis 9511 (OCoLC)968935923
dc.description.notePh.D. University of New Brunswick, Department of Chemical Engineering, 2014.
dc.formattext/xml
dc.format.extentxvii, 157 pages
dc.format.mediumelectronic
dc.identifier.oclc(OCoLC)968935923
dc.identifier.otherThesis 9511
dc.identifier.urihttps://unbscholar.lib.unb.ca/handle/1882/13835
dc.language.isoen_CA
dc.publisherUniversity of New Brunswick
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.subject.disciplineChemical Engineering
dc.subject.lcshWood-pulp--Biotechnology.
dc.subject.lcshSulfate pulping process.
dc.subject.lcshAcetic acid.
dc.titleRecovery of acetic acid from prehydrolysis liquor of kraft based hardwood dissolving pulp process
dc.typedoctoral thesis
thesis.degree.disciplineChemical Engineering
thesis.degree.fullnameDoctor of Philosophy in Engineering
thesis.degree.grantorUniversity of New Brunswick
thesis.degree.leveldoctoral
thesis.degree.namePh.D.

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