The Influence of Montan Resin in Crude Montan Wax on the Character and Performance of Refined Montan Wax

摘要

Montan resin removal and oxidation bleaching are two key procedures for preparing refined montan wax (RMW) from lignite and significantly affect the wax's color appearance. However, due to the large content differences of crude montan wax (CMW) in lignite and montan resin (MR) in CMW, the influence of residual MR in CMW on the character and performance of RMW is unknown. In this study, CMWs with different amounts of residual MR were prepared as raw materials and oxidized into RMWs under the same bleaching conditions. The main physicochemical properties of these RMWs showed that as the residual MR content in CMW increased, the RMW color deepened and the friability and saponification values increased, but the melting point, acid value, and hardness decreased. Meanwhile, the chemicals present in different RMWs were analyzed by gas chromatography-mass spectrometry (GC-MS), and cluster detection showed the content and composition of chemicals in RMWs produced from CMWs with different residual MR contents were significantly different. PCA analysis showed that residual MR in CMW was positively correlated with the friability and saponification value but was negatively correlated with the final melting point, microhardness, and acid value. This work indicates that the residual MR in CMWs has a strong but different influence on the appearance and performance of RMW and provides some basis for further optimization and improvement of refinement techniques for various RMWs used in different areas.