| 摘要 |
A static bed of a substance in finely divided form, at least 90% of the particles having a particle size of not more than 250 microns, is purified by the passage therethrough of a solvent at a rate of flow of the liquid forefront of not greater than 1 cm./min., followed by rinsing with the same liquid. The solvent should have good solvent properties both for the impurity to be removed and the substance to be purified. The particle size is preferably not more than 100 microns. The rate of flow of the liquid forefront is preferably 0,01-0,5 cm./min. The static bed may be in a glass tube. The solvent may be evaporated immediately after passing through the bed to form a layer of impurity-containing substance which is then removed from the purified bed. Various examples are given.ALSO:A static bed of a substance in finely divided form, at least 90% of the particles having a particle size of not more than 250 microns, is purified by the passage therethrough of a solvent at a rate of flow of the liquid forefront of not greater than 1 cm./min., followed by rinsing with the same liquid. The solvent should have good solvent properties both for the impurity to be removed and the substance to be purified. The particle size is preferably not more than 100 microns. The rate of flow of the liquid forefront is preferably 0.01-0.5 cm./min. The static bed may be in a glass tube. The solvent may be evaporated immediately after passing through the bed to form a layer of impurity-containing substance which is then removed from the purified bed. The following substances may be purified: diphenyl, naphthalene, tetraphenylethane, triphenyl carbinol, -naphthol, anthraquinone, benzoic acid, phenyl acetic acid, stearic acid, adipic acid, phthalic anhydride, dimethyl terephthalate, and antipyrine.
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