Title:
METHOD AND DEVICE FOR BACK-EXTRACTION PURIFICATION OF CRUDE PRODUCT OBTAINED BY SUBLIMATION OF MALTOL OR ETHYL MALTOL
Document Type and Number:
WIPO Patent Application WO/2022/122028
Kind Code:
A1
Abstract:
Disclosed in the present application is a method for back-extraction purification of a crude product obtained by sublimation of maltol or ethyl maltol, comprising the following steps: step 1: heating the crude product obtained by sublimation of maltol or ethyl maltol, and water to 80±5℃ for material dissolution; step 2: allowing the material obtained in step 1 to stand to separate into layers, separating an upper aqueous solution layer, and then lowering the temperature of the upper aqueous solution layer to 10-15 ℃; and step 3: centrifuging to obtain a maltol or ethyl maltol crystal subjected to impurity removal. Also disclosed is a purification device. The technical solution for purification of the present application is high in yield and high in product purity.
Inventors:
QIN JILOU (CN)
ZHANG QIJUN (CN)
CHEN JINLIN (CN)
ZHANG QIJUN (CN)
CHEN JINLIN (CN)
Application Number:
PCT/CN2021/137215
Publication Date:
June 16, 2022
Filing Date:
December 10, 2021
Export Citation:
Assignee:
ANHUI JINHE IND CO LTD (CN)
International Classes:
C07D309/40; B01D11/04
Domestic Patent References:
| WO1999023089A1 | 1999-05-14 |
Foreign References:
| CN112574156A | 2021-03-30 | |||
| CN101993428A | 2011-03-30 | |||
| CN104387355A | 2015-03-04 | |||
| CN105906597A | 2016-08-31 | |||
| CN108299362A | 2018-07-20 | |||
| CA2259481A1 | 1999-08-09 |
Other References:
LI, SHIYU: "Improvement of Ethyl Maltol Refining Technology", CHEMICAL INDUSTRY AND ENGINEERING, vol. 12, no. 1, 28 February 1995 (1995-02-28), pages 50 - 53, XP055940866
Attorney, Agent or Firm:
BEIJING LONGAN LAW FIRM (CN)
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