Double function resin process for treating toluidine-containing effluent

Abstract

The present invention relates to the treating process of effluent containing toluidine. In the conditions of 0-40 deg.c temperature and 0.5-8 BV / hr flow rate, effluent containing toluidine is made to pass through treater filled with double function resin of R-NH2, where R is divinyl benzene cross-linked styrene copolymer, and the resin has specific surface area not smaller than 700 sq m / g and exchange capacity not smaller than 0.5 mmol / g. The adsorption saturated double function resin is desorbed with dilute hydrochloric acid solution to regenerate, and the desorbed high concentration toluidine solution is treated through alkali regulation, rectification and other steps to recover toluidine product. The present invention has toluidine recovering rate higher than 80 % and recovered toluidine purity higher than 99 %. The present invention realizes the recovery of toluidine in effluent and the treating process is simple, efficient and economic.

Description

1. Technical field [0001] The invention relates to a treatment method for toluidine-containing wastewater, in particular to a method for treating toluidine-containing wastewater by using a bifunctional resin. 2. Background technology [0002] Toluidine-containing wastewater generally has high pollutant concentration and high toxicity, which is very serious to environmental pollution and has always attracted widespread attention in the industry. At present, the research methods for the treatment of toluidine wastewater mainly include catalytic oxidation and adsorption. Catalytic oxidation can reduce the concentration of toluidine in wastewater, but there are disadvantages such as low efficiency and high treatment cost, which limit the practical application and promotion of the technology. Adsorption treatment of toluidine-containing wastewater makes resource recovery possible because it does not destroy toluidine compounds in the water. Although conventional adsorbents such ...

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Problems solved by technology

Although conventional adsorbents such as activated carbon have a large amount of adsorption to toluidine compounds, they need to be regenerated with hot steam, resulting in high regeneration costs, and the production and adsorption performance of activated carbon after regeneration are reduced; bentonite, rectorite and molecular sieve p-toluidine The relatively low adsorption capacity also limits its application in toluidine wastewater treatment; although the traditional macroporous adsorption resin has a large adsorption capacity, its adsorption selectivity is poor, and the toluidine compound adsorbed on the resin is easily oxidized and deteriorated , resulting in the difficult recovery of the adsorbed toluidine compound or the low purity of the recovered toluidine compound