| 摘要 |
In a conventional manufacture of chitosan from chitin by deacetylation thereof with a hot sodium hydroxide solution, separation of the reaction medium and washing, neutralization and drying of the resulting chitosan, the used natrium hydroxide solution, the reaction medium, is regenerated by addition of a low-molecular, polar organic compound for the attainment of two phases, the organic phase of which contains a substantial part of the acetate formed at the deacetylation and other impurities, and the aqueous phase, which substantially consists of sodium hydroxide solution freed of acetate and other impurities, is recycled for deacetylation of a new amount of chitin. A chitosan product resulting from the use of a lye regenerated in this manner does not substantially change the deacetylation degree and molecular weight at subsequent regenerations.
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