METHOD FOR TREATING SALT-CONTAINING WASTE WATER OF 2-ETHYLHEXANOL AND 2-ETHYLHEXANOIC ACID PRODUCTION, PROCESS AREA FOR ITS IMPLEMENTATION

FIELD: chemistry.SUBSTANCE: method involves the treament of the initial mixture with sulfuric acid and the separation of fatty acids. At the first stage, the waste water (6) is mixed with sulfuric acid (3), the mixture is transferred to a separator (9), from which the lower aqueous layer is fed to the collection tank for sodium sulfate solution (10), and the upper organic layer is fed into the tank for collecting the mixture of organic acids (11) returned to the production cycle. At the second stage, the aqueous sodium sulfate solution from the collecting tank (10) is fed at a rate ensuring the azeotropic mixture evaporation in an amount of 12-15% by weight of the water fed, at the temperature of 98-100°C, into the evaporator (12). The vapour phase from the evaporator (12) is fed through the heat exchanger (13) into the container (14) for separating the layers. The lower layer is fed into the container (15) for the sodium sulfate solution with a minimum content of organic impurities, and the upper layer containing not more than 20-30% of the light alcohols mixture is returned to the 2-ethylhexanol production cycle. The aqueous solution not evaporated in the evaporator (12) is fed into the container (15) for directing into the sewage treatment plant. The process area for the method implementation includes two groups of equipment assemblies providing two-stage treatment of salt-containing wastewater.EFFECT: obtaining at least 15 per cent of the commercial product from the volume of treated salt-containing waste waters, excluding the burning operation when disposing salt-containing waste water, obtaining cleaned water with the pH 6 and a low content of COD.2 cl, 1 dwg,1 ex Изобретения могут быть использованы в химической технологии для переработки солесодержащих сточных вод производства 2-этилгексанола и 2-этилгексановой кислоты. Способ включает обработку исходной смеси серной кислотой и отделение жирных кислот. На первой стадии осуществляют перемешивание сточных вод (6) с серной кислотой (3), подачу смеси в разделитель (9), из которого нижний водный слой подают в накопительную емкость для раствора сульфата натрия (10), а верхний органический слой подают в емкость для сбора смеси органических кислот (11), возвращаемых в цикл производства. На второй стадии водный раствор сульфата натрия из накопительной емкости (10) подают со скоростью, обеспечивающей испарение азеотропной смеси в количестве 12-15% от массы подаваемой воды, при температуре 98-100°C в испарител