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10. CONCLUSIONS
Gases produced in Germany for subsequent utilization in synthesis processes invariably required purification for the removal of impurities and deleterious components.
Dust and tar were removed by (1) mechanical processes, usually cyclones, (2) electrostatic methods, and (3) water washing.
Hydrogen sulfide was removed by (1) Alkazid process, (2) Carbon adsorption with subsequent (NH4)2S wash and (3) Iron oxide process. Organic sulfur was generally removed by the "feinreinigung" which consisted of cracking and removal of the sulfur as H2S over iron oxide-alkali catalyst at temperatures from 150 to 300ºC.
Aromatic and resin-forming compounds were removed by activated carbon.
Carbon dioxide was removed by (1) Alkazid process at low pressure (a) Water washing at high pressure and (3) Caustic solution for removal of final traces for special purposes.
Carbon monoxide was removed from hydrogen for high pressure hydrogenation by high pressure absorption with copper ammonium carbonate or formate solution.
Various other gas purification had been developed but were not in large scale use. Some of these processes are described in documents included in the appendix to the report.
W.H. Lyon
Lt., USNR
R.M. Crawford
Technician