Method for preparing tobias acid by effective components extracted from waste water of tobias acid production

Abstract

The invention relates to a method for extracting effective component from the waste water of the mother liquor of tobias acid production to produce tobias acid, belonging to the waste pollutant resource utilization technique of environment protection field. The invention resolves the problems of prior art which simply refluxes strip liquor as impurity accumulation to affect product quality. The method comprises cooling strip liquor to -2DEG C and 20DEG C in a kettle with a jacket, keeping the temperature for 3-12h, filtering out mirabilite, concentrating the denitration liquid in a distiller, discharging steam, evaporating out 35-50% of water content, reducing temperature, precipitating at least 95% organic crystal at 35-50DEG C, centrifugally filtering to obtain hydroxyl sodium tobias acid and some wet product of sodium tobias acid, dissolving the wet product and processing ammonia complex, feeding into an ammoniation reactor for ammoniation, increasing temperature to 140-160DEG C, keeping temperature for 6-8h, discharging ammonia, reducing temperature to 100-110DEG C, transferring ammoniation liquid into am acid precipitation kettle, processing acid precipitation via hydrochloride (or dilute sulfuric acid) at 75-100DEG C until pH is 1-2, filtering and washing to obtain tobias acid particle crystals, centrifugally processing to obtain tobias acid wet product, and drying to obtain final product whose purity is higher than 97.00-99.00% (tested by HPLC).

Description

technical field [0001] The invention relates to a method of extracting effective components from the waste water of the production mother liquor of Tubic acid to prepare Tubic acid, which belongs to the recycling technology of waste pollutants in the field of environmental protection. Background technique [0002] The production of tunic acid discharges a large amount of wastewater, which has high COD, dark color, high salt content, and complex components. The technology of extraction treatment has been very mature. The essence of this technology is to remove almost all colored substances and most of the organic matter in wastewater And a part of the inorganic matter is extracted; then after back extraction, it is transferred to the back extraction liquid. Although the back-extraction liquid contains available toborate and hydroxytomolate, its color is darker and the impurity content is higher. However, in the prior art, the stripping liquid is disposed of without any treat...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this method is that the harmful impurities in the stripping solution will be discharged together with the mother liquor of tunic acid, and after the subsequent extraction-stripping process, they will enter the stripping solution again.

Such repeated cycles will inevitably lead to the accumulation of impurities in the stripping liquid, the increase of the impurity content, and the deepening of the chroma.

Due to its reuse, it affects the quality of tunic acid products

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