Coal Hydrogenation and the Production of Synthetic Fuels

Summary

Carl Bosch’s "Coal Hydrogenation and the Production of Synthetic Fuels" presents the technical and industrial processes for converting coal into liquid hydrocarbons via hydrogenation, a method Bosch pioneered at BASF in the 1910s–1930s. The book’s central thesis is that coal hydrogenation—specifically the Bergius process—can economically produce synthetic gasoline, diesel, and lubricants from abundant coal reserves, addressing energy shortages in nations lacking petroleum. Bosch details the high-pressure hydrogenation of coal slurries using catalysts like iron oxides, the separation of products into fractions, and the recycling of hydrogen. He also discusses plant design, safety measures for handling hydrogen at 200–700 atmospheres, and the integration of byproducts like tar and ammonia. The reader gains a concrete understanding of the chemical engineering challenges—catalyst poisoning, heat management, and hydrogen production—that made early synthetic fuel plants feasible, as well as the economic and strategic rationale behind Germany’s pre-WWII fuel program.

Full text isn't indexed yet — this overview draws on general knowledge of the book and its metadata, and chat works the same way.

Key concepts

• Bergius process — A method of directly hydrogenating coal at high pressure (200–700 atm) and temperature (400–500°C) to produce liquid hydrocarbons.
• Catalyst poisoning — The deactivation of hydrogenation catalysts by sulfur, nitrogen, or ash in coal, requiring pretreatment or robust catalyst formulations.
• Hydrogen recycle loop — The continuous recovery and recompression of unreacted hydrogen gas from the reactor effluent to improve process efficiency.
• Coal slurry — A mixture of finely ground coal and a heavy oil or tar vehicle, pumped into the hydrogenation reactor to facilitate heat transfer and reaction.
• Fractional distillation — The separation of the hydrogenation product into gasoline, diesel, and heavier oils based on boiling point ranges.
• Lurgi gasifier — A related technology for producing synthesis gas from coal, used in indirect liquefaction routes, though Bosch focuses on direct hydrogenation.