Abstract
To obtain some fundamental knowledges of pitch deposition on multistage bleaching process of hardwood braft pulp, chemical composition of pitch was investigated.From the neutral fraction, squalene, β-sitosterol, and an unknown steroidal substance was isolated and identified.The existence of myristic-, palmitic-acids, a new fatty acid C30H6003m.p 7272.5°, and linoleic acid was shown by paper chromatography and preparation of those characteristic derivath cs. The conversion of pitch from fresh resin to trouble deposits was discussed in terms of its composition.
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