| 摘要 |
The present invention relates to a continous process for the preparation of a pulverous carotenoid, retinoid or natural colourant preparation, wherein the active ingredient is finely divided, which process comprises the steps of a) forming a suspension of the active ingredient in a water-immiscible organic solvent optionally containing an antioxidant and/or an oil, b) feeding the suspension of step a) to a heat exchanger and heating said suspension to 100-250 DEG C, whereby the residence time in the heat exchanger is less than 5 see, c) rapidly mixing the solution of step b) at a temperature in the range of 20-100 DEG C with an aqueous solution of a swellable colloid optionally containing a stabilizer, d) removing the organic solvent and e) converting the dispersion of step d) into a pulverous preparation. |
