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.
paraffin - a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2) alkane, alkane series, methane series, paraffin series. aliphatic compound - organic compound that is an alkane or alkene or alkyne or their derivative. butane - occurs in natural gas; used in the manufacture of rubber and fuels.