Effect of solvent hydrotreatment on product yield in the coal liquefaction process

摘要

Effects of solvent hydrotreatment on product yields in the NEDOL coal liquefaction process were examined based on the data obtained by a 150 t/d pilot plant operation. When the hydrogen gas consumption in the liquefaction stage was kept constant at 4.7 wt.%-daf (wt.% on the basis of dry and ash-free coal), the yield of the oil fraction increased from 51.0 to 54.9 wt.%-daf with anse in the hydrogen gas consumption from 0.7 to 1.3 wt.%-daf in the hydrotreatment stage. In the hydrotreatment stage. about 30% of the hydrogen consumed was utilized for enrichment naphthenic hydrogen content in the solvent, and the rest was used for both the removal of ngen from the solvent and the production of the 14b.t oil f &ctiotx. ~ss ~ ~eSac~cr3 swge. tl~e drogen donated from the solvectC w&~ ~ An~ ~can ~ine gaseous ‘hydrogen for the oduction of the oil fraction. Under the conditions that the total hydrogen consumption in the otreatment and liquefaction stages was kept constant, the yield of oil fraction and the nitrogenin oil fraction were higher when the hydrogen consumption in the liquefaction stage