Method for continuous multistage membrane separation of trimethylamine ethylene colactone from salt compound

• Main Author: LIU BOQIAN
• Format: Patent
• Language: Chinese; English
• Published: 15.09.2010
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; FODDER; FOODS OR FOODSTUFFS; HUMAN NECESSITIES; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR TREATMENT, NOT COVERED BY OTHER CLASSES; TRANSPORTING

The invention discloses a method for continuous multistage membrane separation of a trimethylamine ethylene colactone from a salt compound, which comprises the following steps of: dividing aqueous solution of which the mass ratio of trimethylamine ethylene colactone to salt compound is or is proximate to a critical mass ratio into two parts, introducing the two parts into the first stage and the tail stage of a multistage membrane separation system in a continuous and opposite reverse flow way respectively, continuously obtaining high-salt concentration aqueous solution of the trimethylamine ethylene colactone, of which the mass ratio of the trimethylamine ethylene colactone to the salt compound is low to the largest extent and is less than the critical mass ratio, from the first stage of the multistage membrane separation system; and converting the high-salt concentration aqueous solution of the trimethylamine ethylene colactone obtained from the first stage of the multistage membrane separation system into