1897. KÖLBEL, H. (Steinkohlen-Bergwerk “Rheinpreussen”.). [Diesel Fuel.] German Patent 747,401, no date. Kainer, p. 247.

PATENTS

1897. KÖLBEL, H. (Steinkohlen-Bergwerk "Rheinpreussen".). [Diesel Fuel.] German Patent 747,401, no date. Kainer, p. 247.

Kogasin and coal-tar oil are mixed in about equal proportions and treated with 20% of H₂SO₄. The diesel fuel thus made is distinguished by high stability to coking, low combustion residue, high energy efficiency, and extremely low CO in the exhaust.