Purified salt of beta-hydroxyethoxy acetic acid, purified 2-p-dioxanone, and manufacturing method therefor
AssigneeMitsui Chemicals, Inc.
InventorsSatoru Nakatani, Takuji Matsumoto, Yoshinori Nakahara, Hideyuki Akieda, Takeshi Ishitoku
Life of this patent
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Abstract
A purified salt of β-hydroxyethoxy acetic acid of formula (1) having a fusion peak-top temperature detected by differential scanning calorimetry (DSC) and a purified 2-p-dioxanone of formula (2) derived from the purified salt of β-hydroxyethoxy acetic acid of formula (1). 1 (wherein in formula (1), n=1-2 , and if n=1, M is Na and/or K, and, if n=2, M is Ca and/or Mg.) 2
Claims16
A purified salt of β-hydroxyethoxy acetic acid which is characterized by detecting fusion peak-top temperature by differential scanning calorimetry (DSC) and which is represented by formula (1).
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- (wherein in formula (1), n=1-2 , and if n=1, M is Na and/or K, and, if n=2, M is Ca and/or Mg.)
A process of manufacturing a purified salt of β-hydroxyethoxy acetic acid represented by the following formula (1), of which a fusion peak-top temperature is detected by differential scanning calorimetry (DSC), characterized in that the process comprises the steps of:
- sedimenting a salt of β-hydroxyethoxy acetic acid of formula (1), a fusion peak-top temperature of which is not detected by differential scanning calorimetry (DSC), with a poor solvent;
- and
- washing a sedimented salt of β-hydroxyethoxy acetic acid with the poor solvent,
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- (wherein in formula (1), n=1-2 , and if n=1, M is Na and/or K, and, if n=2, M is Ca and/or Mg.)
A purified salt of β-hydroxyethoxy acetic acid represented by the following formula (1) obtained by the production process according to any one of the manufacturing methods as claimed in claims 5 to 8,
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- (wherein in formula (1), n=1-2 , and if n=1, M is Na and/or K, and, if n=2, M is Ca and/or Mg.)
A process of manufacturing a purified 2-p-dioxanone represented by the following formula (2), characterized in that a purified salt of β-hydroxyethoxy acetic acid represented by the following formula (1), a fusion peak-top temperature of which is detected by differential scanning calorimetry (DSC), is reacted with an inorganic acid, whereby a neutralization reaction and a cyclization reaction are performed in the same system,
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- (wherein in formula (1), n=1-2 , and if n=1, M is Na and/or K, and, if n=2, M is Ca and/or Mg.)
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Dependencies are inferred from the claim text.