| 摘要 |
<p>The alkaline filtrate contg. the sodium salt of D(+)-camphor sulphonic acid is filtered through a column of polymerised or polycondensed artificial zeolite, such as that formed from styrene-divinyl benzene copolymer with functional sulphonic acid gps. linked directly to the aromatic nucleu, or artificial zeolite obtd. by polycondensation of naphthalene sulphonic acid and phenol sulphonic acid, or with formaldehyde.</p> |
