Method for synthesizing asymmetric carbonate through propylene carbonate in one step and coproducing 1,2-propylene glycol

• Main Authors: SHI LEI, CHEN FEI
• Format: Patent
• Language: Chinese; English
• Published: 19.06.2018
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a method for synthesizing asymmetric carbonate through propylene carbonate in one step and coproducing 1,2-propylene glycol and relates to the method for synthesizing the asymmetric carbonate. The asymmetric carbonate is synthesized through the propylene carbonate, methanol and various alcohols (ROH, wherein R can be various alcohols including straight-chain alcohol, isomeric alcohol, aromatic alcohol, phenols and glycol, such as ethylene glycol, diethylene glycol and polylol) in one step. A crude product obtained by reaction contains dimethyl carbonate, the asymmetric carbonate, symmetric carbonate and the 1,2-propylene glycol, wherein the highest conversion rate of the propylene carbonate can reach 99 percent, and the byproduct 1,2-propylene glycol is used as a bulk raw material and can be separated through simple distillation. A whole reaction process is clean and efficient and has no pollution and any waste is not generated. According to the method provided by the invention, the mol