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In order to obtain highly purified organic substances, sweating of crude crystalline particles was investigated with two organics; m-chloronitrobenzene and />-dichlorobenzene. By maintaining the crude crystals at a temperature close to the equilibrium one in order to form melts and followed by rapid drainage of the melts, the crystals were found to be purified upto 99.99% within 1.5 or 2hr. The final purity was found to depend on the sweating temperature. The rate of purification was analyzed with a model that the drainage of the melts dominated the phenomena of sweating. Empirically, the rate of removal of the melts was expressed as k(