Liquid process and continuous filtering device using high power density ultrasounds

摘要

The present invention relates to a continuous filtration device in a liquid path, characterized in that it comprises, in combination: a modular ultrasonic treatment unit ( 12 ) which is in the form of a tubular metal body ( 11 ) with a cylindrical internal surface ( 13 ) and of circular cross section, open at both its feed end ( 10 ) and its discharge end ( 15 ), the external surface of the said tubular metal body having, in the vicinity of the nodal zone, a collar ( 17 ) which is coaxial with the said tube and which projects radially, this collar being equipped at its periphery with an ultrasonic converter ( 19 ) which projects radially and whose frequency is equal to the vibration frequency of the said collar ( 17 ) and to the longitudinal vibration frequency of the said tubular metal body ( 11 ), and a filtering cylindrical element ( 14 ) having a minimum filtration area of about 50 cm² and preferably about 80 cm² with a mesh opening less than about 20 mum, which is arranged inside the tubular metal body ( 11 ) and coaxially with the latter between its feed end ( 10 ) and discharge end ( 15 ), the nominal ultrasonic power density dissipated inside the tubular metal body being greater than about 2 watts per cm² of filtering area.