Process for the purification of gas generated in the pressure gasification of coal

US4123502A · kind A · utility

Assignee

• Heinz Holter

Inventors

• Heinz Holter
• Heinz Gresch · Wickede (Ruhr), DE
• Heinrich Igelbuscher

Key dates

• Filing date: Aug 15, 1975
• Grant date: Oct 31, 1978
• Expiry date: Aug 15, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23G2201/303
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the purification of gas, which is generated in pressure gasification of coal, which uses a wash oil, especially tar oil, as the washing liquid to avoid clogging of the washing apparatus by tars and tar compounds which precipitate out of the washing liquid when water or aqueous solutions are employed as the washing liquid. The wash oil is preferably used in the circulation, from which solids and tars are continuously removed, and is then fed into the pressure reactor again. The wash oil circulation is continually regenerated through distillation, and the residues are fed into the pressure reactor. Heat is constantly extracted from the gas before or during the washing in a heat exchange process, making it possible to keep the heat loss extremely low and to create optimum temperature at every point of the total cycle by appropriate extraction or addition of heat. The heat extracted may be used for generation of steam, which is fed into the pressure reactor, into the distillation process for the regeneration and purification of the wash oil, and/or into the discharging flow of purified gas. The gas is also desirably brought into contact with separating materials, such as …