Method of preparing low-sulfur, low-ash fuel

US4030893A · kind A · utility

Assignee

• Keller Holding GmbH · DE

Inventor

• Leonard J. Keller · Bonham, US

Key dates

• Filing date: May 20, 1976
• Grant date: Jun 21, 1977
• Expiry date: May 20, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10L9/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of preparing low-sulfur, low-ash fuel from coal while simultaneously recovering valuable chemical products and taking advantage of a surprising co-action between comminution and dissolution and characterized as the steps of comminuting the coal in the presence of an alcohol containing 1-4 carbons atoms, inclusive; forming an admixture of the comminuted coal and alcohol to have a desired minimum of solids; separating the admixture into a first underflow of high density solids, a first middling stream of coal in alcohol and a first overflow stream of the alcohol and its dissolved and suspended constituents; separating the first underflow into a second underflow having therein the sulfur and solids that would form ash if burned and a second overflow comprising a dilute slurry of the coal in the alcohol and dissolved and suspended constituents; separating the first middling stream into a third underflow of high density solids, a second middling stream of coal with only a minor amount of sulfur and high density solids and a third overflow comprising the alcohol and dissolved and suspended constituents; separating the first overflow into a fourth underflow and a fourth overflow;…