脱树脂褐煤蜡的氧化漂白新工艺

New Oxidation Bleaching Technology of Deresinated Montan Wax

以云南峨山脱树脂褐煤蜡(ESDMW)为研究对象,以色度(L)值为主要考察指标,研究脱树脂褐煤蜡的氧化漂白新工艺。考察了在H2O2、CH3COOOH以及H2O2与CH3COOOH组合3种氧化体系下的漂白效果,结果显示H2O2与CH3COOOH组合体系优于H2O2和CH3COOOH的单独体系,且CH3COOOH/H2O2组合的效果较好。对CH3COOOH/H2O2组合时的工艺参数进行了响应面优化,得到最佳条件为:m(CH3COOOH)∶m(ESDMW)20∶1、m(H2O2)∶m(ESDMW)36.7∶1、时间80 min、温度118.5℃,该条件下产物的L值为62.02,与模型预测值63.03基本相符。同时进行了CH3COOOH/H2O2组合体系与Cr6+体系的联合漂白,结果表明Cr6++CH3COOOH/H2O2联合方式的漂白效果最好,优化后的联合方式,在保证较佳漂白效果的前提下有效减少了Cr6+氧化剂的用量。

Using deresinated montan wax （DMW） of E＇shan （ESDMW） from Yunnan province as the material, chroma value （L） as the main index, new oxidation bleaching of DMW were developed. The bleaching effects of three kinds of oxidation systems, i. e., peroxide （H202）, peracetic acid （CH3COOOI-/） and H2O2/CH3COOOH system, were investigated. The results showed that H2O2/CH3COOOH system was better than the single systems of H2O2 and CH3COOOH. The main process parameters in H2O2/CH3 COOOH system was optimized using the response surface method. The optimal conditions were m（ CH3 COOOH） ： m （ESDMW） 20： 1, m（ H2O2 ） ： m（ESDMW） 36.7： 1, time 80 rain and temperature 118.5℃. Under these conditions, the L value of the product was 62.02, which was almost consistent with the model prediction. The joint use of H2O2/CH3COOOH system with the Cr^6＋ was explored. The results showed that the bleaching effect of the joint use of Cr^6＋ ＋ CH3COOOH/H2O2 was better than any other methods used before. More importantly, under the premise of better bleaching effect, the dosage of Cr^6＋ was significantly reduced by the optimized process.