• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 87
  • 36
  • 22
  • 12
  • 12
  • 12
  • 12
  • 12
  • 12
  • 3
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 165
  • 165
  • 57
  • 45
  • 41
  • 38
  • 34
  • 34
  • 34
  • 29
  • 29
  • 29
  • 25
  • 25
  • 25
  • 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.
51

Determination of the optical constants of ash samples from kraft recovery boilers

Samretvanich, Artit 24 April 1997 (has links)
Graduation date: 1997
52

Sintering of fume deposits in kraft recovery boilers

Techakijkajorn, Udom 04 October 1995 (has links)
Fume, sub-micron aerosal particles in the combustion gases, have been identified as a cause of extensive plugging and fouling in the heat transfer section of a kraft recovery boiler in kraft pulp mills. After the deposition on the heat transfer surface, fume deposits will undergo the sintering process which causes densification and hardening, making them hard to remove. There has been relatively little information available on the kinetics of the sintering of fume particles, and no information on the modeling of the sintering process of this particular material. No conclusion about the effect of chloride species on the sintering of fume particles has been made. A series of sintering tests in air at various temperatures were conducted using dense pellets made from a specific fume dust which contains a low amount of chlorides. Each pellet was heated at a constant temperature, ranging from 300��C to 550��C, for a different time interval. By the study of the microstructural change of each sintered specimen, the initial stage, intermediate stage, and final stage of sintering were identified. By the presence of an empirical constant K���, the relative linear shrinkage data in the initial stage sintering fit well with the model proposed by Kingery and Berg��� when volume diffusion is the controlling mechanism. By the presence of an empirical constant K2 and the application of grain growth data, the porosity-time data in the intermediate stage sintering fit well with the model proposed by Coble����� when volume diffusion is the controlling mechanism. The apparent activation energy obtained from the initial stage sintering is equal to 54.5 �� 27.7 kcal/mol which is in good agreement with the apparent activation energy obtained from the intermediate stage sintering which is equal to 56.0 �� 31.3 kcal/mol. A semi-empirical model for the sintering process of this particular well-packed fume dust was formulated. The model does not apply well to the loosely packed fume dust due to some unidentified factors The same experiment was carried out for the other fume dust which contains a high amount of chloride. By the use of the fractional density, the qualitative comparison of the sintering of the low chloride and high chloride dusts was made. At low temperatures, the sintering rate of the high chloride fume dust is lower than that of the low chloride fume dust. At high temperatures, both dusts have the same sintering rate and can sinter close to the theoretical density. It is postulated here that the retarded grain growth rate for the high chloride dust can improve the densification process in the intermediate stage sintering. / Graduation date: 1996
53

The possible correlation between hemicelluloses and the physical properties of bleached kraft pulps.

Ratliff, Francis T. (Francis Tenney) 01 January 1948 (has links)
No description available.
54

The effect of sodium peroxide bleaching on the components of eastern spruce groundwood

Jones, Gary Wood 01 January 1949 (has links)
No description available.
55

Inorganic aerosol formation during black liquor drop combustion

Verrill, Christopher Lee 01 January 1992 (has links)
No description available.
56

The resistance of Douglas-fir to sulfite pulping

Hoge, William Henry, January 1954 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1954. / Includes bibliographical references (p. 118-121).
57

The physical properties of slash pine semichemical kraft pulp and of its fully chlorited component

Keeney, Frederick Critchfield, January 1952 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1952. / Includes bibliographical references (p. 154-157).
58

The effect of elevated temperatures on the neutral sulfite pulping process

Walters, Wally Z., January 1959 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1959. / Includes bibliographical references (p. 107-109).
59

Photostabilization of high-yield pulps : reactions of thiols and quinones with pulp /

Spender, Jonathan, January 2001 (has links)
Thesis (M.S.) in Chemistry--University of Maine, 2001. / Includes vita. Includes bibliographical references (leaves 61-67).
60

An investigation of the role of sodium sulfide in cellulosic chain cleavage during kraft pulping

Blythe, David A., January 1984 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1984. / Includes bibliographical references (p. 83-86).

Page generated in 0.0851 seconds