以废弃食用油(简称废油脂)为原料,合成了两种废纸脱墨常用的表面活性剂:脂肪酰胺丙基二甲基胺和脂肪酰胺型季铵盐;通过条件实验获得两种表面活性剂的最佳合成条件;考察了两种表面活性剂对旧报纸的浮选脱墨效果,并与市售表面活性剂(AEO-9和皂钠)进行比较.结果表明,脂肪酰胺丙基二甲基胺的最优合成条件为:反应温度110℃,反应时间2h,物料摩尔比1∶1.1,转化率62％;脂肪酰胺型季铵盐的最优合成条件为:以异丙醇作溶剂,反应温度72℃,反应时间0.5h,溶剂用量20％,转化率82.7％.两种表面活性剂单独使用时,脱墨后纸浆白度均高于采用市售表面活性剂AEO-9和皂钠的,两种表面活性剂以1:1比例复配后使用,脱墨后纸浆白度可达54.3％,这两种表面活性剂均可与AEO-9复配使用,且效果比单独使用AEO-9时纸浆白度可分别提高7.3个百分点和5.6个百分点.%Two kinds of surfactants fatty amide propyl dimethyl amine and fatty amide type quaternary ammonium salt could be synthesized bywaste edible vegetable oil (Abbreviation:waste oil).The optimal conditions of synthesizing fatty amido propyl dimethyl amine were obtainedby conditional experiments with temperature of 110℃,time of 2 h,material ratio of 1 ∶ 1.1,conversion rate of 62％;the optimal conditions of synthesizing fatty acid type quaternary ammonium salt using isopropyl alcohol as solvent were determined as the follows:temperature 72℃,time 0.5 h,solvent content 20％,conversion rate 82.7％.This paper verified the deinking effenciencies of these two surfactants for old newspaper,and compared their deinking results with AEO-9 and commercial soap.Results showed that the deinked pulp brightness using these two surfactants separately was superior to AEO-9 and commercial soap,the brightness of the pulp deinked with the mixture of these two surfactants in the ratio of 1:1 could reached to 54.3％,these two surfactants mixed with AEO-9 separately could achieve 6 and 6 percentage points higher brightness than using AEO-9 alone.
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