Bleaching Being a Resum of the Important Researches On the Industry Published
Bleaching Being a Resum of the Important Researches On the Industry Published
S H Sydney Herbert Higgins
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Cit. ) found that the first lye boil removed 91-5 per cent of the nitrogen, and a second lye boil 917 per cent — that is, on washing the cloth well after the first lye boil, and then boiling in freshly made alkah, only a further 0*2 per cent of nitrogen was eliminated, leaving 8-3 per cent still present on the fibre. Obviously this nitrogen cannot be present as protein, but as some other nitrogen compound. That this residual nitrogen is not protein nitrogen is supported by Hebden's figures show...ing the elimination of phos- phorus during the bleaching. Phosphorus occurs in the protein of the nucleus of plant cells, and as 60 per cent of the phosphorus was removed in the steep, and 100 per cent at the end of the first lye boil, it follows that the protein containing the phosphorus was all removed by the lye boil. The results obtained in the case of linen yarn showed that caustic soda again effectively removed the proteins of the fibre as also did the scouring process — hme boil, sour, and lye boil.
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