公开(公告)号：WO1997006305A1

公开(公告)日：1997-02-20

申请号：PCT/US1996012776

申请日：1996-08-06

Applicant: BELOIT TECHNOLOGIES, INC.

Inventor： BELOIT TECHNOLOGIES, INC. ,  ROUNSAVILLE, Jeffrey ,  MINAMI, Shusuke

IPC: D21C09/153

CPC classification number: D21C11/06 ,  D21C9/153

Abstract: A method for reprocessing an ozone-containing gas present in a pulp bleaching plant comprising the steps of supplying the ozone-containing gas to a scrubber and reducing the ozone concentration of the gas as the gas flows through the scrubber. The step of reducing comprises the steps of supplying an alkaline medium to the scrubber and flowing the ozone-containing gas in countercurrent relationship with the alkaline medium within the scrubber so as to provide intimate contact between the ozone-containing gas and the alkaline medium, thereby converting the ozone-containing gas into a substantially ozone-free gas. The alkaline medium may comprise one of the following: a sodium hydroxide solution; white liquor; post oxygen stage filtrate; weak black liquor; or filtrate from an Eo stage of the pulp bleaching plant. The method further comprises the step of separately discharging the ozone-containing gas and the alkaline medium from the scrubber. The ozone-containing gas may comprise an off-gas, which has been partially reacted with a pulp within a pulp bleaching stage or alternatively may comprise fresh bleaching gas, having an ozone concentration ranging from about 6 % to about 14 % by weight within a carrier gas, with the fresh bleaching gas being supplied directly from an ozone generator to the scrubber.

Abstract translation: 一种用于再处理存在于纸浆漂白设备中的含臭氧气体的方法，包括以下步骤：当气体流过洗涤器时，将含臭氧的气体供给洗涤器并降低气体的臭氧浓度。 还原步骤包括以下步骤：向洗涤器供应碱性介质，并使含臭氧气体与洗涤器内的碱性介质呈逆流关系，从而提供含臭氧气体和碱性介质之间的紧密接触，从而 将含臭氧气体转化为基本上无臭氧的气体。 碱性介质可以包括以下之一：氢氧化钠溶液; 白酒 后氧阶段滤液; 弱黑液 或来自纸浆漂白设备的Eo阶段的滤液。 该方法还包括从洗涤器分离排出含臭氧气体和碱性介质的步骤。 含臭氧的气体可以包含废气，废气已经在纸浆漂白阶段中与纸浆部分反应，或者可以包含新鲜漂白气体，其中臭氧浓度范围为约6重量％至约14重量％ 载气，新鲜漂白气体从臭氧发生器直接供应到洗涤器。