| 摘要 |
FIELD: composite materials. ^ SUBSTANCE: objective of invention is to obtain fine and ultrafine materials for use in chemical and pharmaceutical industries. Stream composed of gas and particles of first solid substance, e.g. phthalic anhydride, is created in its solid substance desublimation zone by interaction of its vapors with a cold inert gas until supersatuaration state is reached. Resulting mixture is held in this zone until required size of phthalic anhydride particles (5-12 mcm) is attained. Gas-solid particles stream is passed into the second substance desublimation zone, into which simultaneously vapor-gas mixture containing vapor of a second substance, e.g. benzoic acid, is introduced in the form of two jets disposed in a flat perpendicular to the stream containing solid phthalic anhydride particles. Introduction points are equally distanced form each other. Thus obtained particles are 7-15 mcm in size and have uniformly distributed coating. ^ EFFECT: optimized process conditions. ^ 1 tbl |
