Method for recovering sodium theophylline mother liquid

Abstract

The invention discloses a method for recovering sodium theophylline mother liquid. The method comprises the following steps of: neutralizing the sodium theophylline mother liquid by using concentrated sulfuric acid, and enabling the neutralized sodium theophylline mother liquid to pass through macroporous adsorption resin so as to obtain sodium theophylline adsorbed macroporous adsorption resin; preparing a resin regeneration solution from 1-95% of organic solvent, 4-30% of surfactant and 1-95% of water; and in ultrasonic wave fields, desorbing the sodium theophylline adsorbed macroporous adsorption resin by using the resin regeneration solution so as to obtain sodium theophylline desorbed liquid, and then, concentrating and centrifuging so as to obtain solid sodium theophylline. By adopting the method disclosed by the invention to recover the sodium theophylline mother liquid, the macroporous adsorption resin still has relatively-high adsorption ratio and desorption ratio after repeated use, the sodium theophylline adsorption ratio is increased to about 90% from original 60-70%, the desorption ratio is increased to about 95% from about 85%, the COD (Chemical Oxygen Demand) of the discharged residual liquid is decreased to about 10,000 mg / L from original average 13,000 mg / L, and the number and quality of the recovered sodium theophylline are greatly increased.

Description

technical field [0001] The invention relates to a treatment method for a chemical mother liquor, in particular to a recycling and treatment method for a tea sodium mother liquor. Background technique [0002] Theophylline sodium salt is referred to as tea sodium for short, and its chemical name is 1,3-dimethylxanthine sodium salt. The tea sodium solid material is obtained by centrifugation after synthesis, nitrosation, reduction, formylation, and ring closure reactions. At the same time, the mother liquor produced during the centrifugation process contains 0.5%-0.8% tea sodium. If it is not treated, it will lose hundreds of dollars per year. tons of tea sodium, so the current industry mostly adopts macroporous adsorption resin for recovery. The process is generally as follows: neutralize the tea sodium mother liquor with acid → absorb the tea sodium in the mother liquor through the macroporous adsorption resin → analyze the tea sodium on the macroporous adsorption resin wit...

AI Technical Summary

Problems solved by technology

In actual production, the efficiency of the existing process for recovering tea sodium is not high, which is mainly due to the fact that the mother liquor of tea sodium contains more impurities, so that after repeated use of the macroporous adsorption resin, on the one hand, its ability to absorb tea sodium decreases. On the other hand, the efficiency of analyzing tea sodium is also significantly reduced, and the COD value of the raffinate discharged after analysis is also large, which requires additional regeneration of the macroporous adsorption resin, and the frequent regeneration of the resin leads to a shortened service life of the resin