FIELD: organic chemistry. SUBSTANCE: concentration is carried out by condensation. Said condensation takes place on the surface of porous material having pores 0.1-300 μm in size or on the surface of metallic sieve having holes with diameter up to 300 μm,. Porous material is cooled at outside surface at pressure being lower then pressure of steam-gaseous mixture, namely at 0.03-3.0 atm. EFFECT: improves efficiency of the method, improves quality of desired product. 4 cl, 1 tbl
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