METODE DAN ALAT UNTUK MEMISAHKAN SUATU ZAT DARI SUATU CAMPURAN BERBENTUK CAIR DENGAN KRISTALISASI BERTINGKAT

摘要

Process to separate material from a liq. mixt. by fractional crystallisation by sepn. of a crystal layer from one side of a wall (75) of a crystalliser (S1, S2, S3, 70) which is cooled on the other side. Next, the crystal layer is melted. For crystallisation, a medium is allowed to evaporate on the other side of the wall (75, 78), and the pressure of the gaseous phase of the medium in the crystalliser is controlled according to the temp. required for crystallisation. Also claimed is a device to carry out the above process having at least one crystalliser (70) with a housing (71), in which a crystallisation area (74) is sepd. from a medium area (80) by a wall (75). The medium area has at least one inlet (95) and outlet (94) for liq. medium, and at least one connection (96) for transport of gaseous medium. Pressure control devices (33, 18, 28, 19, 29, 20, 30) are also fitted.