MULTISTAGE EXTRACTION UNIT Russian patent published in 1998 - IPC

FIELD: multistage centrifugal apparatuses with countercurrent flow through its separate stages of aqueous and organic solutions in hydrometallurgy, medical and food industries. SUBSTANCE: unit includes several similar stages interconnected by transfer branch pipes of 1,2,3-single-stage centrifugal extractors. Each stage consists of mixing chamber 4, chambers 7, 8 for collection of separated phases, rotor 14 and transporting device 16. Each mixing chamber 4 has emergency branch pipe made in the form of lower elbow 23 and upper elbow 24. Lower elbow 23 is connected with low bottom region of mixing chamber 4 of one stage 2 and located below level of its bottom, and upper elbow 25 is connected with upper region of mixing chamber of other stage 1 in zone located above level of transporting device 16, but below the level of chambers 7, 8 of collection of separated phases. In this case, emergency branch pipe 32 on stage 1 outlet in direction of flow of heavy phase is secured by lower elbow 31 and on stage 3 outlet in flow of light phase, upper elbow of emergency branch pipe 33 is secured in zone located above the level of upper elbow of the remaining emergency branch pipes. EFFECT: simplified design and no limits for the number of stages in the unit. 2 dwg