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Wednesday, August 12, 2020 | History

2 edition of Muconic acids in bleach plant effluents. found in the catalog.

Muconic acids in bleach plant effluents.

Esa Jaakko Vilen

Muconic acids in bleach plant effluents.

by Esa Jaakko Vilen

  • 364 Want to read
  • 8 Currently reading

Published .
Written in English


The Physical Object
Pagination171 leaves.
Number of Pages171
ID Numbers
Open LibraryOL20913990M
ISBN 10061241048X

Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment.. Most industries produce some trends have been to minimize such production or. PULP AND PAPER - Free download as Powerpoint Presentation .ppt), PDF File .pdf), Text File .txt) or view presentation slides online.

After oxygen stages, the content of monomeric acidic phenols and aromatic acids in the effluents was very low. The highest amount of carbohydrates was found dissolved in the first P stage mill effluent. The average molar mass of UV-absorbing material was lowest in ozone effluents. Carbohydrates were determined as monosaccharides after acid. Hydrochloric acid is used to convert high-grade scheelite concentrate (CaWO 4) and crude sodium tungstate to tungstic acid, which in turn, can be used to produce tungsten metal and chemicals. Hydrochloric acid is also used in uranium and zirconium processing, solution mining of borate ores, as a pH regulator in the.

Hydroxy benzaldehyde, vanillic acids, syringic acids, p-Hydroxy benzoic acid, fervilic acid and p-coumaric acids. For the reutilization of the post oxygen effluent, it is essential to oxidize the lignin fragments to decolourize the effluent. For that oxidative treatment with . Other than muconic acid, some other dicarboxylic acids can also be produced from the bioconversion of lignin. 2‐pyrone‐4,6‐dicarboxylic acid (PDC), a novel platform chemical that can be used to produce a variety of bio‐based polymers, can be synthesized by a transgenic strain of P. putida PDHV85 from vanillin, vanillic acid, and.


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Muconic acids in bleach plant effluents by Esa Jaakko Vilen Download PDF EPUB FB2

Muconic acids were the major reaction products. Muwnic acids in bleach plant effluents were found for the first time, and the high molecular weight material in the effluents was shown to contain muconic acid type structures.

The study on the reaction products of guaiacol reaction with chlorine dioxide resulted in identification of I7 by: 1. Identification of Muconic Acids in Bleach Plant Effluent Identification of Muconic Acids in Bleach Plant Effluent Vilen, E.; Reeve, Douglas W.; McKague, A.

Introduction Muconic acid derivatives were first proposed as products of pulp bleaching with chlorine dioxide in (Sarkanen et al.). Although numerous model compounds have been shown to react with chlorine.

The method is based on the use of quantitative 13 C NMR and the pH-dependent cyclization of muconic acids in aqueous solution. 20–40 % of the carboxylic acids in the high molecular weight material isolated from bleach plant effluents from three softwood kraft mills were found to exhibit muconic acid-type behaviour.

Vilen's 3 research works with 35 citations and 30 reads, including: Quantification of Muconic Acid-Type Structures in High Molecular Weight Material from Bleach Plant Effluents. The structure of cis,cis-muconic acid was verified by both 1 H- and 13 C-NMR spectra, which were obtained from a Brucker AM MHz NMR spectrometer with CD 3 OD as the solvent.

The 1 H-NMR spectrum (Fig. 2A) exhibited two doublets with the chemical shifts located at δ (2H) and δ (2H), respectively. In addition, the three singlets appeared on the 13 C-NMR spectrum (i.e., Cited by: This book covers bleach plant effluents, that most polluting effluent from the pulp and paper industry.

Disappearance of benthic invertebrates, a high incidence of fish diseases, and mutagenic effects on the aquatic fauna are some of the consequences of the disposal of bleach effluents into surface waters.

This book covers bleach plant effluents, that most polluting effluent from the pulp and paper indus-try. Disappearance of benthic invertebrates, a high incidence of fish diseases, and mutagenic effects on the aquatic fauna are some of the consequences of the disposal of bleach effluents into surface wa-ters.

It is believed that the enhancement of toxicity to Daphnia magna of end-product solutions produced by the WAO of D0 and E1 bleach plant effluents over TiO 2 and Ru/TiO 2 solids results from a synergistic effect of intermediate organic acids combined with the salts present in treated bleach plant effluents in considerable quantities.

Identification of Muconic Acids in Bleach Plant Effluents University of Toronto. Enhancing AOX Removal in Aerobic Biological Treatment Systems University of Toronto. Influence of Nutrients on AOX Removal in activated sludge plants University of Toronto.

High-temp Biological Treatment of Bleached Pulp Mill Effluent University of Toronto. Quantification of Muconic Acid-Type Structures in High Molecular Weight Material from Bleach Plant Effluents. Holzforschung54 (3), DOI: /HF A. Bruce McKague. Synthesis Of Muconic Acids By Peracetic Acid Oxidation Of Catechols.

INTRODUCTION. Muconic acid (cis,cis-muconic acid [MA]) is an unsaturated dicarboxylic acid with a molecular mass of g/ is used for the production of industrially relevant chemicals such as adipic acid (AA), terephthalic acid, caprolactam, and 1,6-hexanediol as well as food ingredients and pharmaceuticals, with a combined annual market value of more than $8 billion ().

The bleach plant is the most important source of effluent within a pulp mill and the chlorinated effluents are more complicated to reutilize within the mill. For this reason, an important trend in bleaching development is to reduce volumes and decrease the effluent loads, especially of chlorinated compounds [ 40 – 42 ].

PEER-REVIEWED ARTICLE Barros et al. “Peracetic acid for pulp bleaching,” BioResources 5(2), R OCH3 O H HO OCCH3 O R OCH3 O OH R O O - CH3CO2H - CH3OH Fig. Aromatic structures demethoxylation by Paa (Ni and D’Entremont ). Theoretically, equivalent amounts of cis,cis-muconic acid should have been produced and retained in the CT plants (no cis,cis-muconic acid was detected in the media previously).

Unexpectedly, only nmol cis,cis-muconic acid (about % of the amount of catechol disappeared) was detected within the plants (Table I). Rhizopus oryzae, a zygomycete, was found to decolorize, dechlorinate, and detoxify bleach plant effluent at lower cosubstrate concentrations than the basidiomycetes previously glucose at 1 g/liter, this fungus removed 92 to 95% of the color, 50% of the chemical oxygen demand, 72% of the adsorbable organic halide, and 37% of the extractable organic halide in 24 h at.

Modeling Bleach Effluent Characteristics Steady-State Modeling of Bleach Sequences Steady-State Models for D 1 and D 2 Stages Steady-State Models for D 0 and Extraction Stages ((EO), (EP), or (EOP)) Optimization of Bleach Sequences Based on Models Optimum Chlorine Dioxide Load Sharing Between D 1 and.

cause scaling in the bleach plant. Oxalic acid is produced through acid hydrolysis that occurs when an acid stage (e.g. ozone and chlorine dioxide) is used to remove pulp hexenuronic acids (Begnor-Gidnert et al. The presence of molybdenum in the bleaching filtrate causes no significant damage to the effluent system nor to the recovery.

Quantification of muconic acid-type structures in high molecular weight material from bleach plant effluents. Holzforschung – (). Solution-state NMR of lignins. In: (). Stereochemistry of the enzymatic lactonization of cis, cis-muconic and 3-methyl-cis, cis-muconic acid.

@article{osti_, title = {Bleach plant filtrate recovery}, author = {Reeve, D W and Rowlandson, G and Rapson, W H}, abstractNote = {Acid and alkaline filtrates are separated from the bleach plant of a bleached pulp mill for use in washing unbleached pulp free from entrained pulping liquor.

Acid effluent is neutralized with sodium hydroxide solution prior to use in the washing as the last.

The recycling of bleach plant effluents to the kraft recovery cycle is widely regarded as an approach to low effluent bleached kraft pulp production. The focus of this work has been on developing an electrodialysis process for recycling the acidic bleach plant effluent of bleached more» Kraft pulp mills.

Chlorine dioxide reacts with the residual lignin only as an oxidant, forming ring-opened muconic acid (ester) structures (LaFleur, ). Giga-fren This has the form of original digestion of wood furnish (black liquor, condensates derived from black liquor, black liquor carryover to bleach plant), and bleach plant effluents, which contain.Environmental context.

Nonylphenol polyethoxylates (NPEOs) are widely used non-ionic surfactants, and they cause environmental concern because some metabolites of NPEOs possess endocrine-disrupting activities. Photodegradation is an important pathway for NPEOs degradation, and different degradation products may lead to different environmental risks.

The present paper looks at the kinetics and.Sampling of Combined Bleach Plant Effluent. A combined bleach plant sample is produced for each bleach plant. It includes all seal tank overflows that leave the bleach plant, excluding any recycle flows that are reused within the bleach plant.

It also excludes any lime mud or other additions from outside the bleach plant.