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.
Full Definition of SYCOPHANT. : a servile self-seeking flatterer. â sycophant adjective. See sycophant defined for English-language learners. See sycophant defined for kids.ADVERTISEMENT. And swirling all around were coteries of agents, managers, execs, and moneymen; publicists and journalists, gawkers and sycophants. â 2 Daniel Fierman et al., Entertainment Weekly, 9 June 2006. 3  Where his father liked to have sycophants, he likes to be with intellectuals.