DL- tartrate CAS: 133-37-9 Chinese Synonyms: (2R, 3R) -2,3- dihydroxy-1,4 acid; (R *, R *) - (±) -2,3- two malic acid; DL - (-) - tartaric acid; DL-2,3- dihydroxy acid; racemic tartaric acid; DL- tartaric acid; (2R, 3R) -2,3- dihydroxy English name: DL -Tartaric acid Formula: C4H6O6 Molecular Weight: 150.09 EINECS Number: 205-105-7 Related Categories: Food and feed additives; resolving agent, melting point: 210-212 ° C (. lit) density: 1.788 FEMA: 3044 Flash Point: 210 ° C Solubility: H2O: 0.1 g / mL and chemical properties: Appearance is colorless crystal or white crystalline powder, odorless, sour taste. Uses: 1, for the manufacture tartaric acid salts, used as a pH stabilizer in the plating blueprint, the food industry as a sour agent, the industry is mainly used complexing agent. 2, used as laboratory reagents, masking agents and beer foaming agent, also used in the tanning industry 3, widely used in food, medicine, chemical industry, light industry and other industries. Such as beer foaming agent, acidulant, flavoring agents, used in soft drinks, candy, juices, sauces, cold dishes, baking powder, with its sour citric acid 1.3 times, particularly suitable as a sour grape juice agent. In tanning, photo, glass, enamel, telecommunications equipment and other industries also have a very important role. Production methods: 1, maleic anhydride oxidation of maleic anhydride and hydrogen peroxide solution in the acid effect a reaction to ethylene succinic acid, then hydrolyzed to give tartaric acid, and then cooling and crystallization, separation and drying too pure. 2. crude tartar tartar law when making wine as raw material, processed into milk of lime, calcium tartrate, and then * acidification.