Sachsse-Bartholomé method

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The Sachsse-Bartholomé process is a process developed by Hans Sachsse and Ernst Bartholomé at BASF in the early 1950s for the production of acetylene from methane and other low-molecular hydrocarbons . The process lost importance with the displacement of acetylene as a raw material for the chemical industry by cheaper olefins towards the end of the 1960s. The Sachsse-Bartholomé process is a further development of the Sachsse process of the IG Farbenindustrie .

Procedure

In the Sachsse-Bartholomé process, methane is preferably partially burned in an autothermal process with pure oxygen . In the first step, the methane and oxygen are heated separately to around 300 to 600 ° C, then mixed and burned in a burner to form flames. The oxygen-to-methane ratio is set to a value of approximately one to two, so that the combustion can only run incompletely. The response time is only milliseconds . The reaction mixture is quenched very quickly with water so that the unstable acetylene does not break down further into carbon and hydrogen. Nevertheless, about 5% soot as well as hydrogen and carbon monoxide are produced in large quantities as by-products . The quenching is done by injecting water. The reaction temperature is about 1400 ° C.

Avoiding flame formation at the mixing point and stabilizing a stationary flame is critical in the process. The acetylene is then washed out with a selective solvent such as N-methylpyrrolidone or dimethylformamide .

Individual evidence

  1. ↑ a b Ernst Bartholomé: Problems of large-scale plants for the production of acetylene by the oxygen process. In: Chemical Engineer Technology - CIT. 26, 1954, pp. 253-258, doi : 10.1002 / cite.330260503 .
  2. ↑ Patent US2235749 : Production of acetylene. Published on March 18, 1941 , inventors: Hans Klein, Hans Sachsse, Wilhelm Hofeditz, Ferdinand Haubach. ‌
  3. ↑ Ernst Bartholomé: The development of the process for the production of acetylene by partial oxidation of hydrocarbons. In: Chemical Engineer Technology. 49, 1977, pp. 459-463, doi : 10.1002 / cite.330490602 .
  4. ^ A b Wilhelm Keim, Arno Behr, Günther Schmitt: Basics of industrial chemistry . Otto Salle Verlag, 1985, ISBN 3-7935-5490-2 , pp. 151-153.
  5. ↑ Ernst Bartholomé: The BASF process for production of acetylene by partial oxidation of gaseous hydrocarbons. In: Chemical Engineering Science. 3, 1954, pp. 94-104, doi : 10.1016 / S0009-2509 (54) 80009-1 .