Abstract: The invention relates to a process for the crossflow micro-filtration of beer. In order to prevent the clogging of the membrane of the filter module by components of the non-clarified beer which are to be filtered out and settle in the form of a covering, the filtration is interrupted at intervals. In a subsequent brief pause the covering on the membrane is chemically and partially dissolved with a caustic solution whereafter the covering is subsequently removed by backwashing of the membrane with water. In order to further improve the filtration, the transmembrane pressure (p) is regulated during the filtration phase according to a substantially periodic time function, and the crossflow velocity (v) of the beer over the membrane is increased substantially continuously.

Abstract: An apparatus for heating liquids, in particular foodstuffs and luxury foodstuffs, for the purpose of pasteurizing, sterilizing and the like of the aforesaid foodstuffs. The apparatus consists of a rotor which is rotatable in a hollow sleeve part of a housing. An annular clearance space is provided between the internal surface of the hollow sleeve part and the exterior surface of the rotor. The liquid to be treated is fed into the clearance space at one end and discharged at a location spaced from the aforesaid one end of the rotor. The peripheral surface of the rotor on at least one end adjacent the location whereat the liquid is introduced into the clearance space is provided with a conveyor thread.