METHOD OF MATERIALS TREATMENT BY THE MULTIPLE EXTENSION-COMPRESSION OF A DISSOLVENT Russian patent published in 2006 - IPC B01D11/02 B01D9/00 

FIELD: methods of materials treatment by the multiple extension-compression of a dissolvent in different processes.

SUBSTANCE: the invention is pertaining to the methods of materials treatment by the multiple extension-compression of a dissolvent in processes of recrystallization, extraction, deposition of coatings, sedimentation, impregnation, removal of contaminants and at realization of various chemical reactions. A liquid consisting of a dissolvent, a soluble substance and a gaseous fluid is expanded by its passing through a retaining medium containing a filtering screen, which holds the undissolved particles of the soluble substance. Let the gaseous fluid to dissolve up to concentration at which the liquid extends until it will not lose its capacity to dissolve the soluble substance, which at that is settling. The settlings are held by the retaining medium containing the filtering screen. Then the pressure in the liquid is reduced up to the pressure, at which the main amount of the gaseous fluid may leave it and so forming the liquid possessing a capacity to dissolve a soluble substance. The produced liquid may be optionally added with some amount of a soluble matter. In the result of repetition of the cycles of the extension and compression the mixture of the dissolvents and the gaseous fluids is transformed from the dissolvent into an antidissolvent at the minimal losses of the dissolvent. At that one and the same dissolvent is used multiply. The invention allows to treat a big amount of the soluble material by the minimal amount of the dissolvent.

EFFECT: the invention allows to process a big amount of the soluble material by the minimal amount of the dissolvent.

26 cl, 5 ex, 10 dwg, 1 tbl