| 摘要 |
<p>PURPOSE:To effectively remove unnecessary ingredients from a natural crude wax by adding a given amount of a solvent to the wax, heating the mixture to around the melting point of the wax to dissolve the wax, cooling the solution to precipitate a solid matter, and conducting solid-liquid separation so that the wax recovered has a given solvent content. CONSTITUTION:A solvent (e.g. a 1-4C alcohol) is added to a crude wax (e.g. one obtained from sugar cane) in an amount of 3-30 times by weight. The mixture is heated to a temp. in the range of [melting point of the wax] + or -20 deg.C to dissolve the wax. The solution is cooled to -10 deg.C to 40 deg.C to precipitate a solid matter. The solid is separated from the liquid with a centrifugal separator, etc., so that the solvent content of the solid becomes 50-90%. A solvent is added to solid thus obtained in an amount of 3-20 times by weight, and the mixture is heated to a temp. in the range of [melting point of the wax] + or -20 deg.C to dissolve the wax. The resulting solvent-insoluble matter containing an insoluble high-density substance is removed by solid-liquid separation at such a temp. The solvent is removed from the resulting wax solution by distillation, etc.</p> |
