Kinetics And Performance Of Direct Liquefaction Of Coal From Yili At Low Pressure

Coal from Tiechanggou,Yili processing conditions of direct liquefaction wereinvestigated, and its liquefaction kinetics model was established, As well as, theeffect of five kinds of oil-soluble catalyst on its liquefaction behavior wasresearched.First of all, its analysis showed that, the coal has a characteristic of "four-highand one-low"，which are high H/C, high volatile, high sulfur, high vitrinite and lowmoisture. In accordance with the structure-chemical index model in Russian, itsdegree of unsaturation δ=8.52and parameter of reduction B=16.94%,which showedthat the coal was suitable for direct liquefaction.TG-DTG analysis showed that at475.0℃, we can get the largest weight loss velocity.Secondly, with Fe2O3+S as catalysts, oil yield as the object, the effect of S/C,reaction temperature, reaction time and initial hydrogen pressure on its liquefactionperformance was inspected by L₁₆（4⁵）. The results showed that, on the suitableliquefaction conditions, that is P（H₂）=7.0MPa，T=430℃，S/C=2.5:1and θ=45min,itsyields of oil and conversion were78.14%and91.37%, respectively.What’s more, with Fe2O3+S as catalysts. Its dynamic model which has fourvelocity constants was established, and model parameters were calculated. The resultsshowed that,⑴In the initial of its liquefaction process, its mainly product ispreasphaltenes. Oil and gas were derived by preasphaltene and asphaltene indirectly.⑵Its direct liquefaction was the conventional reaction course, namely, coal�'preasphaltene�'asphaltene�'oil+gas.⑶The dynamic model fit for itsexperimental processes within410⁴30℃.Finally, under the suitable conditions, the catlysist was replaced by oil-solubleFe、Co and Ni, respectively. The results showed that,（1） Its maximum oil yield wasupto69.51%, when the amount of oleic acid-coated Fe₃O₄was3%.（2） when reactiontime was extended to60min,with a target of oil yield, the catalytic order of those catalysts was, effect oleic acid-coated Ni（OH）2>oleylamine-coated Fe₃O₄> oleicacid-coated Fe₃O₄> oleic acid-coated Co3O4> Fe2O3> oleic acid iron.⑶Oleylamine-coated Fe₃O₄can inhibit the formation of gas extremely, its gas yield waslow to0.