| 摘要 |
1292517 Urea adducts EDELEANU GmbH 8 April 1970 [18 April 1969] 16751/70 Heading C5E An emulsion, comprising a paraffin and an aqueous solution of urea and formed in the decomposition of a urea adduct produced in the separation of n-paraffins from a hydrocarbon mixture diluted with an oil solvent, is treated by feeding water into a stream of the emulsion, feeding oil solvent into the stream downstream of the water feed, passing the resultant feed through a filter and allowing the filtered stream to settle and separate into an aqueous urea layer and a layer of paraffin-containing oil solvent. The aqueous urea layer can be used for the decomposition of urea adduct or concentrated and used for the formation of the urea adduct; the paraffin-containing oil solvent layer can be used to dilute the hydrocarbon mixture prior to adduct formation. A suitable filter is a cartridge of sintered metal balls. One volume of spindle oil is diluted with 2 volumes of dichloromethane and stored at 30-40‹ C. with 1 volume of an aqueous urea solution saturated at 70‹ C., the solid adduct formed is separated and decomposed at 85‹ C. with water to form an upper layer of n-paraffins, a lower layer of aqueous urea and an intermediate layer of emulsion. |
