Coking quality of coals with insufficient coking properties
AssigneeRutgerswerke Aktiengesellschaft
InventorsJurgen Stadelhofer, Heinz-Gerhard Franck, Karl H. Koch, Rolf Marrett
Life of this patent
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Abstract
Upgrading coke quality of coals by adding a pitch-like product with a softening point (K-S) of 90.degree.-160.degree. C. to the coal. The additive is obtained by treating finely divided coal or other carbon containing raw material with hydrocarbon solvents derived from coal and petroleum and then removing 2-20% of the light boiling components of the highly aromatic pitch-like product.
Claims5
In a process for upgrading the coke quality of coals with insufficient coking properties, the improvement comprising mixing with said coal a coking coal improvement medium which is a pitch-like product with a softening point (Kramer-Sarnow method) of 90.degree.-160.degree. C., and is obtained from the highly aromatic carbonaceous material produced by the disintegration of comminuted coal and/or similar coal-like raw materials with a combination of hydrocarbon mixtures as the solvent which are aromatic residues from the steam pyrolysis of petroleum fractions in combination with coal-derived aromatic mixtures with an average boiling point above 350.degree. as complementary solvent, with the use of elevated temperature and pressure conditions, and by distilling off 2 to 20% of light-boiling components.
An additive for the improvement of the coke quality of coals with insufficient coking properties, comprising the pitch-like product with a softening point (Kramer-Sarnow method) of 90.degree.-160.degree. C. which is obtained from the highly aromatic carbonaceous material obtained by the disintegration of comminuted coal and/or similar coal-like raw materials with a combination of hydrocarbon mixtures as the solvent, which are aromatic residues from the steam pyrolysis of petroleum fractions in combination with coal-derived aromatic mixtures with an average boiling point above 350.degree. as complementary solvent, with the use of elevated temperature and pressure conditions, and wherein from 2 to 20% of light-boiling components are distilled off.
Dependencies are inferred from the claim text.