| 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, removing the solvent-insoluble matter, further adding the solvent to the solution, cooling it 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 a wax to solvent ratio of 1:(3-20) 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 resulting solvent-insoluble matter is removed by solid-liquid separation at such a temp. The solvent amount is then regulated so that the wax to solvent ratio becomes 1:(3-30) by weight. The resulting mixture is heated to a temp. in the range of [melting point of the wax] + or -20>=C and 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%. The solvent is removed from the resulting wax in solution or solid state.</p> |
