Title:
METHOD FOR PURIFYING HIGH-PURITY METHYL-4-FORMYLBENZOATE FROM BY-PRODUCTS PRODUCED DURING PREPARATION OF DIMETHYL TEREPHTHALATE
Document Type and Number:
WIPO Patent Application WO/2012/096425
Kind Code:
A1
Abstract:
The present invention relates to a method for purifying higher purity methyl formylbenzoate comprising the steps of: (a) adding alcohol to reaction by-products containing methyl formylbenzoate, which are produced during the preparation of DMT, and filtering this mixture; (b) adding (i) hydroxylamine or an inorganic salt of hydroxylamine and (ii) an alkali component to a filtrate obtained through the filtering to convert methyl formylbenzoate in the filtrate into methyl-4-formylbenzoate through oximation and then filtering the resultant mixture; (c) dissolving the prepared mixture of methyl-4-formylbenzoate into toluene or methylene chloride; and (d) adding an acid to the mixture.
Inventors:
KIM SEOK CHAN (KR)
KIM WOO SUN (KR)
LEE YOUN A (KR)
RYU YOUNG (KR)
JEONG HYO JIN (KR)
KIM WOO SUN (KR)
LEE YOUN A (KR)
RYU YOUNG (KR)
JEONG HYO JIN (KR)
Application Number:
PCT/KR2011/001984
Publication Date:
July 19, 2012
Filing Date:
March 23, 2011
Export Citation:
Assignee:
UNIV KOOKMIN IND ACAD COOP FOUND (KR)
KOREA RES INST CHEM TECH (KR)
KIM SEOK CHAN (KR)
KIM WOO SUN (KR)
LEE YOUN A (KR)
RYU YOUNG (KR)
JEONG HYO JIN (KR)
KOREA RES INST CHEM TECH (KR)
KIM SEOK CHAN (KR)
KIM WOO SUN (KR)
LEE YOUN A (KR)
RYU YOUNG (KR)
JEONG HYO JIN (KR)
International Classes:
C07C67/62; C07B60/00; C07C67/31; C07C69/76
Foreign References:
| JPS5612350A | 1981-02-06 | |||
| KR950005193B1 | 1995-05-19 | |||
| JPS5753441A | 1982-03-30 |
Attorney, Agent or Firm:
LEE & PARK (KR)
청운특허법인 (KR)
청운특허법인 (KR)
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Claims: