Desenvolvimento de processo e produtos para controle de substâncias em estado coloidal (stickies) na produção de papel reciclado

• Autor(a) principal: Soares, Vássia Carvalho
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2965
• topic: Papel reciclado; Aproveitamento; Colóides; Química da água; Detergentes; Partição de fases; Recycled paper; Colloids; Water chemistry; Detergent; Phase partition; Water reuse; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS::TECNOLOGIA DE CELULOSE E PAPEL

In the last years, paper mills show an increasing tendency to use secondary fibers in papermaking. Because of this factor with water system closure, an accumulation of both dissolved and colloidal substances (DCS) occurs in the whitewater, that can agglomerate and form deposits or pollutants the so-called stickies. Those pollutants are originated from resins of wood material, as well as from additives used in the papermaking processes. The particles originated from those pollutants are not necessarily sticky at their colloidal or dissolved states, but they can become sticky due to physical-chemical alterations in the medium. DCS in whitewater of a paper machine may cause operational disturbances, economical and productivity losses. Many costs associated to the use of recycled paper as raw material are related to installation and operation of the equipments for removal of these pollutants. The objectives of this study were: to develop a method for separation of the colloidal substances from the whitewater, aiming at the extraction of those particles and reuse of the whitewater; and to develop some surfactants agents for stickies control, that would be useful in those pollutant controlling process, mainly for the recycled paper industry. Both objectives were reached, a method for extracting the particles through aqueous two-phase systems (ATPS) and the new surfactants agents developed on the basis of the Neem oil showed good results. In addition, there is still the possibility to improve the efficiency of ATPS, by using this process after the colloidal-particles are dispersed.