FIELD: chemistry.
SUBSTANCE: invention relates to method for obtaining glycolide from salt of alkali metal of monochloroacetic acid in one stage by heating up to 6 cm thick layer of reaction mass without addition of catalyst and mixing with glycolide distillation in vacuum. Distillation is realised at temperature of reaction mixture 180-270°C, glycolide steam is condensed in vacuum line at temperature 90-120°C and condensate is collected in vacuum receiver at temperature 40-50°C. As a result target product, which is re-crystallised in low-polarity solvent, for example ethylacetate, is obtained. Glycolide output constitutes to 85%, product purity is 99.5-99.9%.
EFFECT: simplification of process of increasing target product output and purity.
4 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF OBTAINING GLYCOLIDE | 2012 |
|
RU2512306C1 |
| PROCESS FOR GLYCOLIDE | 1987 |
|
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| METHOD OF PRODUCING L-LACTIDE | 2011 |
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| METHOD OF OBTAINING AMPHOTERIC SURFACE-ACTIVE SUBSTANCES | 0 |
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SU675054A1 |
| METHOD OF PURIFYING LACTIDE FROM INITIATING IMPURITIES | 2023 |
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RU2816655C1 |
