FIELD: technological processes.
SUBSTANCE: invention is related to the filtration method of grafted polyol dispersions with use of repeated filter system. Invention describes a method of grafted polyol filtering with use of refillable filter system consisting in a) use of refillable filter system that consists of the first tank and the second tank; b) the first part of the positive-displacement filter material is installed between the first and the second tanks thus developing fluid-tight seal is developed between the first tank and filter material; c) dispersion of grafted polyol is loaded to the first tank; d) dispersion of grafted polyol is let to the second tank through filter material, and e) the first part of positive-displacement filter material is removed from the area between the first and the second tanks and the second part of clean positive-displacement filter material with twisting pores is installed between the first and the second tanks. Received filtered dispersion of grafted polyol has particles of maximum size of 25 microns and is stable for various conditions for minimum period of 9 weeks.
EFFECT: method ensures cost effective and fast filtration of large volumes of grafted polyol dispersion.
17 cl, 1 dwg, 3 ex
