METHOD OF EXTRACTING SODIUM FORMIATE FROM PENTAERYTHRITOL-FORMIATE MOTHER SOLUTION

摘要

FIELD: technological processes.;SUBSTANCE: invention relates to organic synthesis, particularly to processing of pentaerythritol-formiate mother solutions, and can be used for producing sodium formiate. Method of extracting sodium formiate from pentaerythritol-formiate mother solution involves a step of extracting sodium formiate from mother solution, obtained during production of pentaerythritol, with separation of liquid phase. Separated liquid phase in form of solution containing pentaerythritol with impurities and sodium formiate on the edge of saturation at temperature of 95±5 °C is fed into vessel, mother solution, obtained during production of pentaerythritol, is added at temperature of 45±5 °C, mixture temperature is brought to 55-65 °C, mixture is held at this temperature until formation of crystals of pentaerythritol with size of not less than 150 mcm. Obtained suspension is filtered to separate released crystals of pentaerythritol and impurities. Remaining solution of sodium formiate is returned to the step of sodium formiate extracting from mother solution, obtained during production of pentaerythritol.;EFFECT: invention allows to increase efficiency of the process by increasing the amount of sodium formiate, obtained at processing of pentaerythritol-formiate mother solution.;1 cl, 3 tbl, 3 ex