| 摘要 |
PURPOSE:To obtain an ultrafiltration membrane having excellent fractional separability in the region of fractional mol.wt., high strength, and good stability by using a curdlan derivative shown by a specified formula and obtained by chemically modifying the hydroxyl group of curdlan as the raw material. CONSTITUTION:A curdlan derivative such as acetyl curdlan shown by the general formula [C6H7O2(OR)X(OH)3-X]n is obtained by alkylating or acylating the hydroxyl group of curdlan (beta-1,3-glucan) shown by the formula. In the general formula, R is a 1-4C lower alkyl group or an acyl group shown by R'CO- (where R' is a 1-4C lower alkyl group), X is 1-3, and (n) shows about 200-2,000 integer. The curdlan derivative is dissolved in formic acid to prepare a cast soln. which is spread over a horizontal glass sheet. The solvent is partially evaporated and the material is dipped into water and gelated to obtain a separation membrane. The membrane is capable of separating org. acids from saccharides having about the same mol.wt.
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