| 摘要 |
PURPOSE:To remove by-products easily with high efficiency and purify the titled compound useful for producing detergents, etc. into high purity, by heat-treating a crude hydroxyalkanesulfonate obtained by reacting a hydrogen sulfite with an alkylene oxide under specific conditions. CONSTITUTION:A hydrogensulfite, e.g. sulfurous acid, is first reacted with an alkylene oxide of formula I (R<1>-R<4> are H, methyl or ethyl), e.g. ethylene oxide, and the reaction product containing the resultant hydroxyalkanesulfonate of formula II (X is H or salt-forming substance) obtained by the above-mentioned reaction, e.g. hydroxyethanesulfonic acid, is heat-treated at 60-210 deg.C in air and/or an atmosphere of an inert gas to purify the compound of formula II.
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