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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Low-molecular weight lignosulfonates from spent sulfite liquor : isolation, purification and identification /

Lo, Cheng-fan. January 1970 (has links)
Thesis (Ph. D.)--Oregon State University, 1970. / Typescript (photocopy). Includes bibliographical references (leaves 140-145). Also available on the World Wide Web.
2

Manufacture of vitamin B12 from sulfite spent liquor.

Ferguson, David Kimball January 1972 (has links)
Up to 2 mg/l of vitamin B₁₂ were produced batch-wise using Propionibacterium freudenreichii on an ammonia based spent sulfite liquor medium in 250 ml Erlenmeyer flasks and a 7-litre benchtop fermentor. The up to 6 gm/l of bacteria utilized the hexoses from the SSL, thus reducing the BOD by 50-80% and producing, as by-products, 3 gm/1 of acetic acid and 7 gm/1 of propionic acid. Pre-treatment of the liquor required stripping of SO₂ to below 200 ppm and adjustment of the pH to between 6.5 and 7.5; precipitation of 1igno-su1fonate was not necessary. It was necessary to add excessive amounts (up to 75 gm/1 dry) of yeast extract or other supplementary nutrient to achieve these vitamin B₁₂ yields. Solutions to this nutrient problem are suggested. The Monod fermentation model whose parameters were estimated using non-linear least squares techniques with dry bacterial cell concentration as the dependent variable, approximate the batch data well. Other less complicated models were not as satisfactory. Estimating the model parameters using linear techniques was most unsatisfactory indeed. Optimum hold-up times for a single stage fermentor for Propionibacteria production, predicted from the Monod model whose parameters were estimated from batch data, were up to 125 hours. These hold-up time extrapolations are subject to large errors. Recommendations for further work on the vitamin B₁₂ process, the extension of the batch modeling work to continuous fermentation and further work on other more suitable microbiological products made from SSL are entertained. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate
3

Adhesive formulation via thermolytic modification of lignin /

Foster, Norman Charles. January 1979 (has links)
Thesis--University of Washington. / Vita. Includes bibliographical references.
4

The composition of a spent spruce sulfite liquor /

Forss, Kaj. January 1961 (has links)
Thesis (Ph. D.)--Abo Akademi, 1961. / "This investigation was carried out at the Finnish Pulp and Paper Research Institute, Helsingfors, during the years 1956-1960." Includes bibliographical references ([142]-148).
5

Bacterial utilization of spent sulfite liquor and single cell production /

Sirinda Yunchalard, Flegel, Timothy W., January 1984 (has links) (PDF)
Thesis (M.Sc. (Microbiology))--Mahidol University, 1984.
6

Fermentation of sulfite spent liquor

Nishikawa, Masabumi January 1968 (has links)
Fermentation of sulfite spent liquor with Propionibacterium freudenreichii was done to produce volatile acids (acetic and propionic) and Vitamin B₁₂. It was found that in addition to producing these compounds some reduction in the pollution potential (COD) of this waste product was achieved. Better growth resulted if the spent liquor was first treated to remove lignin and calcium compounds. An existing spectrophotometry assay technique for measuring Vitamin B₁₂ content was modified for use in the presence of sulfite spent liquor. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate
7

A study of the chemical recovery in the monosulfite pulping process

Schelhorn, Frederick Bernard, January 1943 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1943. / Includes bibliographical references (p. 66-68).
8

A study of the nature of lignosulfonic acids fractionated by chemical and physical methods

Schenck, Willard Allan, January 1942 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1942. / Includes bibliographical references (p. 68-70).
9

A fundamental study of the reaction between kraft black liquor and nitrobenzene

Csellak, William Robert, January 1950 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1950. / Includes bibliographical references (p. 65-66).
10

An investigation of the coloring matter of sulfite liquor

Simerl, Linton Earl, January 1939 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1939. / Bibliography: leaves 151-156.

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