Research on extraction and separation of heavy wax in coal-based Fischer-Tropsch waxy residue
The research on the comprehensive utilization of coal-based Fischer-Tropsch waxy residue was of great significance in terms of resource utilization,economic benefits and environmental protection.With Fischer-Tropsch hydrogenation refined first-line oil of CHN Energy Ningxia Coal Industry Co.,Ltd.as the extraction agent,the extraction-centrifugal separation technology was adopted,and research on effective recovery of heavy wax in the coal-based Fischer-Tropsch waxy residue was conducted.By controlling the single variable,the effects of residue-agent ratio,extraction temperature,centrifuge speed,centrifugal temperature and centrifugal time on the wax recovery rate and oil loss rate were systematically investigated.The experimental results showed that the wax recovery rate and the oil loss rate remained constantly between 91%-94%and 15%-18%respectively under the conditions of residue-agent ratio 1∶5,extraction temperature 80℃,centrifuge speed 3 500 r/min,centrifugal temperature 80℃and centrifugal time 5 minutes,showing excellent extraction separation effect and techno-economic feasibility.
coal chemical industryFischer-Tropsch synthesiswaxy residueheavy waxextractionseparation
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