Precipitation is also useful to isolate the products of a reaction during workup. Ideally, the product of the reaction is insoluble in the reaction solvent. Thus, it precipitates as it is formed, preferably forming pure crystals. An example of this would be the synthesis of porphyrins in refluxing propionic acid.
Freebase(0.00 / 0 votes)Rate this definition: Cellophane. Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air, oils, greases, bacteria and water makes it useful for food packaging.
cellophane(n.) a transparent paper-like product made of regenerated cellulose, produced in sheets and rolls, which is impervious to moisture and germs, and which is used to wrap candy, cigarettes, and a wide variety of other products for distribution and retail sale; as, a pack of cigarettes in a cellophane wrapper.