نوع مقاله : مقاله کامل علمی پژوهشی
نویسندگان
1 دانشگاه علوم کشاورزی و منابع طبیعی گرگان
2 دانشگاه علوم کشاورزی و منابع طبیعی ساری
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and goals: This research changed into achieved with the intention of manufacturing dissolving pulp or alpha-cellulose from bagasse. Alpha-cellulose is generally used for making cellulose derivatives with advantage of being soluble in commonplace solvents in recognize to cellulose. Dissolving pulps have high alpha-cellulose and brightness, but very low hemicelluloses, ash, and extractives, with uniform molecular weight distribution.
Substances and methods: Bagasse chips were pretreated beneath slight acidic situation the use of acetic acid at most temperature of a hundred 165 ºC, to obtain yield loss stages of approximately 20 and 30 percent in pre-extraction level. Bleachable pulps at kappa wide variety decrease than 12 had been created from each the pre-extracted samples, the usage of soda-AQ pulping technique at most cooking temperature of a hundred 165 ºC. The pulp samples produced under optimum situations, have been bleached by chlorine free bleaching (ECF) with AD0EpD1P bleaching sequence. The properties have been decided on the basis of policies TAPPI. In the end, a statistical evaluation of the effects of exams finished on dissolving pulps created from SPSS software program and t-test two samples become used.
Results: in this look at, dissolving pulp carries numerous alpha-cellulose from depithed Bagasse with acid pre-extraction and the soda-AQ pulping procedure turned into prepared. While that within the acid pre-extraction yield loss improved from 20 to 30, the alpha cellulose production increased but the degree of polymerization declined. In produce dissolving pulp, in addition lignin, hemicelluloses are also undesirable impurities, so the more material will be removed from the purity cellulose pulp increases, but with increasing destruction of the hemicellulose in the pre-extraction, may be cellulose chain additionally damaged, although alpha-cellulose to increase the degree of polymerization to be associated with high drop.
conclusion: Bagasse dissolving pulp having ninety two percentage alpha-cellulose with DP of 870, can also have restrained packages in making derivatives such as cellulose acetate and cellulose nitrates, however it is able to be used to supply decrease demand products such as viscose rayon and carboxymethyl cellulose. But, the yield and ash dissolving pulp were first-class. The outcomes of this studies evaluation with other research inside the discipline of dissolving pulp manufacturing and additionally considering that the bagasse produced in massive quantities inside the south of the united states, imparting a number of the pulp or alpha cellulose the used inside the manufacture of viscose rayon, as a minimum, can be planned based on bagasse as uncooked cloth.
کلیدواژهها [English]
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