STANNOUS SALT COMPLEX CATALYST AND METHOD FOR PRODUCING L-LACTIDE BY USING SAME

• Main Authors: CHEN, Jianguo, LIU, Xinwei, WU, Peilong, SONG, Ge, CAI, Changwang, WU, Di, LU, Yinqiu
• Format: Patent
• Language: Chinese; English; French
• Published: 23.06.2022
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

Disclosed in the present invention are a stannous salt complex catalyst and a method for producing L-lactide by using same. The catalyst is obtained by reacting stannous salt and phosphite in a solvent. The oxidation of divalent stannous ions into tetravalent tin ions can be effectively inhibited, the conversion rate of meso-lactide is effectively reduced, the yield of L-lactide is increased, and L-lactide, the color of which is close to white, is obtained. In the crude lactide generated after a depolymerization reaction, the content of L-lactide is greater than or equal to 95%, the content of the meso-lactide is less than or equal to 3.8%, and the color of residual liquid is ensured to be close to milky white. La présente invention concerne un catalyseur au complexe de sel stanneux et un procédé de production de L-lactide à l'aide de celui-ci. Le catalyseur est obtenu par mise en réaction du sel stanneux et du phosphite dans un solvant. L'oxydation d'ions stanneux divalents en ions étain tétravalents peut êt