公开(公告)号：US20050279467A1

公开(公告)日：2005-12-22

申请号：US10872450

申请日：2004-06-22

申请人： Hazen Thomas ,  Wayne Winkler ,  Jeffrey Lee

发明人： Hazen Thomas ,  Wayne Winkler ,  Jeffrey Lee

IPC分类号： D21C1/00 ,  D21C9/10 ,  D21C9/16 ,  D21C11/00

CPC分类号： D21C9/163 ,  D21C9/1042 ,  D21C9/1057

摘要： A process for high temperature peroxide bleaching of pulp in which pulp is retained at high temperature and pressure to increase bleaching activity but in which the pulp is cooled prior to discharge from the pressure vessel below the flash point thereby resulting in lower energy, nonviolent discharge. Through the use of a heat exchanger, the cooling of the pulp can be performed using recycled filtrate containing residual peroxide, which encourages further bleaching during atmospheric retention. The heat exchanger is also used to heat a water stream, which can be used earlier in the pulping process, resulting in cost savings because energy within the system is retained to a greater degree.

摘要翻译： 用于高温过氧化物漂白纸浆的方法，其中纸浆在高温和高压下保持以增加漂白活性，但是在从低压闪蒸点排出之前将纸浆冷却，从而导致较低的能量，非暴露的排放。 通过使用热交换器，可以使用含有残余过氧化物的再循环滤液进行纸浆的冷却，这促进了在大气保留期间的进一步漂白。 热交换器也用于加热水流，其可以在制浆过程中较早使用，从而节省成本，因为系统内的能量被更大程度地保持。