Cellulose German method

The nitration plant was identical in principle with that described above, with mechanical stirring. In the German method cellulose in the form of crepe paper prepared from 70% birch and 30% spruce was nitrated. Cellulose, tom to pieces in rollers, was dried to reduce its moisture content from 6-7 to 1.2%. Towards the end of the war the drying stage was omitted at Kriimmel, and cellulose containing 6-7% of moisture was nitrated, since the time saved and the economy in steam achieved then was reckoned sufficient compensation for the need to make use of more concentrated acids. 

Finishing wood cellulose Other sources of cellulose Drying cellulose before nitration Industrial nitration of cellulose Mixed acids Nitration m pots Centrifugal nitration Thomsons method Nitration with mechanical stirring German method Continuous methods of nitration Literature... 

M. von Duttenhofer (1843-1903) nitrated brown charcoal (used for prepn of C/82) by Schultze s method to obtain colloided rifle powder RCP (Rottweiler Cellulose Pulver) which was adopted by the German Army in 1884, but its compn was kept secret until 1887 (See also Vol 5 of Encycl, p D1581, under Duttenhofer s Smokeless Propellant ) (Ref 44, p 244)... 

Doklady Akademii Nauk(Proceedings of Academy of Science,Russia) C.Doree, The Methods of Cellulose Chemistry Chapman Hall, London (194 Deutsches Reichs Patent(German State Patent)... 

Commercial trade in chemical celluloses is assisted by the definition of standard methods of analysis. Extensive collections of quality-defining protocols have been assembled by ISO, the International Standards Organization ASTM, the American Society for Testing Materials TAPPI, the Technical Association of the Pulp and Paper Industry (of USA) DIN (German Industrial Norms) and many others. 

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