Thiourea, also called thiocarbamide, an organic compound that resembles urea but contains sulfur instead of oxygen; i.e., the molecular formula is CS(NH2)2, while that of urea is CO(NH2)2. Like urea, it can be prepared by causing a compound with the same chemical composition to undergo rearrangement, as by heating ammonium thiocyanate (NH4SCN). A method of preparation more commonly used consists of the addition of hydrogen sulfide to cyanamide. Thiourea exhibits many of the chemical properties of urea, but it has little commercial application. The small quantity of thiourea consumed is utilized primarily in photography as a fixing agent, in the manufacture of a thermosetting resin, as an insecticide, as a textile-treating agent, and as starting material for certain dyes and drugs. Thiourea forms as colourless crystals melting at 182° C (360° F). It is toxic, although the fatal dosage is not well established.
Uses of Thiourea:
1.Producing thiourea dioxide，replacing sodium hydrosulfite
2.Used as flotation agent in gold mine
3.Used as intermediate of thiazole and drugs inhibiting thyroid disease
4.Used as intermediate of pesticide
5.Used as the production of resin materials
6.Used as bleaching agent, coloring agent and antioxidant in textile industry
7.Used in photography, electroplating etc.