Abstract

Crude montan wax (CMW) is a natural wax extracted directly from lignite by organic solvents that can be prepared into deresined montan wax (DMW) by the deresination process and then bleached into refined montan wax (RMW) by an oxidation process. Based on the different requirements for the DMW properties in different applications, a study on effects of the different factors on the deresination rate in CMW and the residual montan resin (MR) content on basic properties of DMW was carried out in this work. It was found that ethyl acetate displays an improved deresination effect, and that time and temperature are the two key factors that affect the CMW deresination rate (ǀ r ǀ > 0.9). With the increase in the residual MR contents in DMWs, the melting point of DMW decreased while its melting range widened, and its friability, acidity and saponification values increased. Gas chromatography-mass spectrometry analysis revealed that DMWs are rich in fatty esters and acids. It is concluded that the differences in their properties are related to the changes in the amount and content of the acids and esters.

摘要

粗褐煤蜡（CMW）是一种通过有机溶剂直接从褐煤中提取的天然蜡，可通过脱脂工艺制备脱脂褐煤蜡（DMW），然后通过氧化工艺漂白成精制褐煤蜡（RMW）。基于不同应用对DMW性能的不同要求，本文研究了不同因素对CMW脱脂率和残留褐煤树脂(MR)含量对DMW基本性能的影响。发现乙酸乙酯表现出改善的脱脂效果，时间和温度是影响CMW脱脂率的两个关键因素(ǀ r ǀ > 0.9)。随着 DMW 中残留 MR 含量的增加，DMW 的熔点降低，熔程变宽，易碎性增加，酸度和皂化值增加。气相色谱-质谱分析表明 DMW 富含脂肪酯和酸。得出的结论是，它们性能的差异与酸和酯的数量和含量的变化有关。