Coal liquefied oil separation
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This post was last edited by jordan569 on 2013-1-6 at 20:23. Question: What are the current methods for separating coal liquefaction oil, along with their advantages and disadvantages? What is the future direction of this field? In the technical materials I’ve seen, distillation is mentioned as the method used, but there isn’t any specific information available. I earnestly ask for guidance from those who know more! . Note $ # , $ $
Reply to 1# clarify007: What the original poster refers to as liquefied oil separation is likely solid-liquid separation, that is, separating liquefied heavy oil from residues. The main methods currently used for solid-liquid separation are vacuum distillation and centrifugal separation. Vacuum distillation: Advantages include a large processing capacity and stable operation; disadvantages are that some heavy oil is lost in order to ensure the fluidity of the residue. Centrifugal separation: Advantages are high separation efficiency; disadvantages are that the operational characteristics of the materials make it somewhat difficult to use this technique on a large scale. Both the DCL process in Japan and that in the United States were considered, but in the end Shenhua Group opted for vacuum distillation.
Reply to 2# jordan569: Thank you very much for your answer! I would also like to ask about the separation that takes place after this stage: that is, after the liquefied product has undergone initial gas-solid-liquid separation, hydrogenation and denitration are carried out sequentially, so what is the separation process like thereafter? What I read in the materials mentions separation, followed by the production of gasoline, diesel, and similar products; occasionally, distillation towers are mentioned. Are these similar to atmospheric or vacuum distillation towers used in oil separation? I’d like to ask, thank you!
Reply to 3# clarify007: The separation of products is no different from that in the petrochemical industry; a vacuum distillation column is used to obtain the respective components