SOLVENT SCRUBBING RECOVERY OF LACTIDE AND OTHER DIMERIC CYCLIC ESTERS
摘要
An improved process for the recovery of lactide or other dimeric cyclic ester from a gas stream containing the cyclic ester and such hydroxylic impurities as water and open-chain hydroxycarboxylic acids by scrubbing the gas stream with a nonpolar water-immiscible solvent at a temperature at which the cyclic ester is removed from the solvent and any water present in the gas stream is vaporized from the solvent. The cyclic ester is recovered from the solvent in a high state of optical purity.
申请公布号
US5117008(A)
申请公布日期
1992.05.26
申请号
US19900602346
申请日期
1990.10.23
申请人
E. I. DU PONT DE NEMOURS AND COMPANY
发明人
BHATIA, KAMLESH K.;DRYSDALE, NEVILLE E.;KOSAK, JOHN R.