Invention Grant
US3574772A Preparation of pure mono- and dipropylene glycol by plural stage distillation with side stream recovery
失效
纯粹的单一和二氯乙烯甘油的制备由具有侧流回收的平衡阶段蒸馏
- Patent Title: Preparation of pure mono- and dipropylene glycol by plural stage distillation with side stream recovery
- Patent Title (中): 纯粹的单一和二氯乙烯甘油的制备由具有侧流回收的平衡阶段蒸馏
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Application No.: US3574772DApplication Date: 1968-10-25
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Publication No.: US3574772APublication Date: 1971-04-13
- Inventor: BECKER MITCHELL , FEDER JACK B
- Applicant: HALCON INTERNATIONAL INC
- Assignee: Halcon International Inc
- Current Assignee: Halcon International Inc
- Priority: US77056868 1968-10-25
- Main IPC: C07C29/10
- IPC: C07C29/10 ; B01J23/00 ; B01J27/00 ; B01J31/00 ; C07B61/00 ; C07C27/00 ; C07C29/132 ; C07C29/80 ; C07C31/20 ; C07C67/00 ; C07D301/19 ; C07D301/32 ; C07C29/24
Abstract:
THIS INVENTION RELATES TO A PROCESS FOR PREPARING PROPYLENE GLYCOL WHICH MEETS BOTH U.S.P. AND FOOD GRADE STANDARDS. THE PROCESS COMPRISES TREATING A CRUDE PROPYLENE OXIDE WITH AN AQUEOUS BASE, PHASE SEPARATING, HYDROLYZING THE SEPARATED PROPYLENE OXIDE FRACTION TO FORM PROPYLENE GLYCOL AND PASSING SAID PROPYLENE GLYCOL INTO A DISTILLATION ZONE, FRACTIONALLY DISTILLING THE PROPYLENE GLYCOL, SEPARATING PURE MONO PROPYLENE GLYCOL AS A LIQUID STREAM AT AN INTERMEDIATE POINT IN SAID ZONE FROM IMPURITIES WHICH BOIL HIGHER AND LOWER THAN THE PROPYLENE GLYCOL.
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