Methods to enhance brightness of pulp and optimize use of bleaching chemicals
Номер патента: EP1730227A1
Опубликовано: 13-12-2006
Автор(ы): Prasad Y. Duggirala, Sergey M. Shevchenko
Принадлежит: Nalco Co LLC
Опубликовано: 13-12-2006
Автор(ы): Prasad Y. Duggirala, Sergey M. Shevchenko
Принадлежит: Nalco Co LLC
Реферат: Mechanical or Chemical pulp is treated with about 0.01 weight % to about 5 weight % of a Mixture. The Mixture is water; diethylenetriaminepentakis (methyl) phosphonic acid or its known salts; polyacrylic acid or its known salts; and optionally one or more inert compounds. This Mixture acts to either maintain the brightness level of the pulp at the target level or to increase the brightness level of the pulp. In addition the Mixture allows for maintaining the pulp at the target level of brightness even when the amounts of other ingredients, such as hydrogen peroxide, hydrosulfite, sodium silicate and magnesium, that are typically added to the pulp, are reduced.
Method for increasing the tensile strength of pulp
Номер патента: WO2018229337A1. Автор: Yang Wang,Mats Bäckman,Matti Ristolainen,Harri Kosonen,Pasi Virtanen,Sakari MODIG,Ines ELUEN,Tom Hultholm. Владелец: UPM-KYMMENE CORPORATION. Дата публикации: 2018-12-20.