Process for operating a filter plant which is impinged with media heated to different temperatures for ultrafiltration and microfiltration by the cross-flow principle and filter plant for carrying out the process

摘要

To operate a filter plant for ultrafiltration and microfiltration of autoclavable filter elements (1), constructed and operated according to the cross-flow principle, having selectively permeable flat filter membranes (2) which are combined to form a filter stack or filter cassette, using spacers (3), and can be clamped liquid-tightly between end plates (4, 5) having fluid ports (6 to 9) for supplying the filter surfaces with fluid (F1, F2) flowing over these and for draining the fluid from them, at least one end plate (4), by means of a clamping drive (10) to achieve the sealing position, is conducted to be able to slide axially on a frame (11) connecting the two end plates (4, 5), the entire unit, via at least one fluid port (6) is impinged in-line with hot steam at about 120@C in such a way that all of the flow paths of the end plates (4, 5) and the filter element (1) through which the fluid can flow are sterilised. At the same time, via a [lacuna] downstream in a filter plant flow path impinged by hot steam, the temperature of the hot steam or expansion pressures arising as a result are measured and the compression force on the filter element (1) is controlled in the phase of increasing heating of the filter element (1) at the beginning of sterilisation and in the cooling phase after the sterilisation in dependence on temperature up to the sealing position, in such a way that the compression force, in dependence on the temperature prevailing in the filter element (1)... Original abstract incomplete.