Zobrazeno 1 - 9
of 9
pro vyhledávání: '"02"'
Publikováno v:
September 2020. 19:447-460
Paper grade pulp production across the globe is dominated by the kraft process using different lignocellulosic raw materials. Delignification is achieved around 90% using different chemical treatments. A bottleneck for complete delignification is the
Publikováno v:
July 2019. 18:409-414
Peroxide bleaching of softwood and hardwood (eucalypt) kraft pulps was performed in solutions of sodium bicarbonate (NaHCO3), sodium carbonate (Na2CO3), and sodium hydroxide (NaOH). The conventional P stage (hydrogen peroxide + sodium hydroxide; H2O2
Publikováno v:
TAPPI Journal. 18:287-293
Jute cutting, jute caddis, and cutting-caddis mixtures were prehydrolyzed by varying time and temperature to get about 90% prehydrolyzed yield. At the conditions of 170°C for 60 min of prehydrolysis, the yield for 100% jute cutting was 76.3%, while
Autor:
Kirsi Hovikorpi, Esa Vakkilainen
Publikováno v:
TAPPI Journal. 18:297-305
This work describes and discusses sources of noncondensible gases (NCG) in modern kraft pulp mills and modern NCG collection from process units where odor emissions can occur if these gases are released to the surroundings. A mill-wide overview of NC
Autor:
John M. Long, Warren Batchelor
Publikováno v:
July 2018. 17:383-392
It has long been known that in individual wood fibers, the tensile mechanical properties are heavily determined by the nature of the cellulose chains in the fibers. Both elastic tensile modulus and strength are directly related to the fibril angle, w
Publikováno v:
May 2017. 16:287-300
To determine the economic feasibility of producing acetic acid from commercial hardwood chips in kraft pulp mills, laboratory experiments were conducted to obtain sufficient data to perform a preliminary economic analysis for a proposed acetic acid r
Publikováno v:
March 2017. 16:157-169
Many pulp and paper companies are considering implementing a lignin-based biorefinery to diversify their core business to new products and improve their longer-term competitiveness. The best strategy to achieve might not be obvious, considering the l
Publikováno v:
November 2016. 15:685-691
This paper describes the combustion behavior of birch and spruce kraft black liquors obtained from an integrated forest biorefinery concept in which a hot water extraction of chips was performed before pulping. This pretreatment, aiming mainly at the
Publikováno v:
March 2016. 15:159-164
This work characterizes the wood from Corymbia citriodora for pulp production. We evaluated wood chip samples from an 8-year-old C. citriodora plantation. A sample of Eucalyptus grandis x Eucalyptus urophylla chips from a 7-year-old plantation was us