Production method for extracting lignite wax from brown coal
A technology for montan wax and lignite, which is applied in the field of chemical material preparation, can solve the problems of residual benzene solvent, high energy consumption, low production cost, etc., and achieves the effects of high solvent purity, good product quality, and reduced solvent amount
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[0037] Example 1
[0038] (a) Multi-stage countercurrent pulse extraction: The lignite particles are transported to the extractor by the material-sealing conveyor. At 50℃, they are first sprayed, soaked and extracted with an extraction solvent containing 4.0% lignite wax by mass concentration, and then drained. After the extraction solvents containing montan wax with mass concentrations of 3.5%, 2.5%, 1.5%, 0.5%, 0.2%, 0.1%, respectively, followed by seven-stage spray immersion extraction and draining, the extraction solvent contains methanol and industrial n-hexane (content 60 The mass ratio of %) is 0.5:1, and the mass ratio of extraction solvent to lignite is 1.5:1. The extraction is repeated for 180 minutes, and then sprayed with n-hexane solvent for soaking extraction, and finally with methanol solvent for spraying soaking extraction to achieve multi-stage extraction. Countercurrent pulse extraction;
[0039] (b) Negative pressure countercurrent film evaporation: the montan w...
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[0049] Example 2
[0050] (a) Multi-stage countercurrent pulse extraction: The lignite particles are transported to the extractor by the material-sealing conveyor. At 55℃, they are first sprayed, soaked and extracted with an extraction solvent containing 3.8% lignite wax by mass concentration, and then drained. After the extraction solvents containing montan wax with mass concentrations of 3.0%, 2.0%, 1.0%, 0.8%, 0.4%, and 0.05%, successively seven-stage spray immersion extraction and draining, the mass ratio of methanol to n-hexane in the extraction solvent is 0.8:1, the mass ratio of extraction solvent to lignite is 1.8:1, and the extraction is repeated for 120 minutes, and then sprayed soaked with n-hexane solvent, and finally with methanol solvent sprayed soaked to achieve multi-stage countercurrent pulse extraction;
[0051] (b) Negative pressure countercurrent film evaporation: the montan wax-containing mixture obtained in step (a) is filtered through a 120-mesh coarse filter...
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