Fuel production from coal using the Bergius-Pier process became topical again in Germany in the 1970s due to the oil crisis at the time. Hydrogenation of coal is a high-pressure process at a pressure of up to 700 bar and 550°C. For the hydrogenation process in the reactor under the operating conditions mentioned, hydrogen is required as a fresh gas and as a cycle gas. The fresh hydrogen is obtained from a gas storage facility and the circulating gas is recycled within the process. The large-scale plant in Bottrop, Germany, was shut down in 1998 and sold to China together with a pilot plant on a pilot plant scale. The plants are still operating there today.