Study On Comprehensive Control Of Methicillin Production Wastewater

Pymetrozine is a insecticide against Hemipteran and Homopteran insect such as aphids,whiteflies and planthoppers.lt represents a new chemical class of insecticides pyridine azomethine group and acts in a unique way. The production of Pymetrozine leads to producing lots of highly concentrated saline organic wastewater, which will pollute the environment and waste useful resource if discharged directly. The article through to Pymetrozine production wastewater composition, properties and characteristics of systematic summary and an Pymetrozine wastewater treatment process was suggested;A scheme for the treatment of Pymetrozine production wastewater by ammonia conversion, continuous side distillation and complexation extraction method of combining has been proposed.1、Based on reactive distillation experiments, preliminary process of Pymetrozine production wastewater, the solvent of methanol removed, at the same time the purity of the wastewater of sodium acetate improved. The influence of quantity of NaOH adding on free ammonia removal was experimentally investigated. Results showed that the proper addition of NaOH is 7.2g/100g. The distillate is neutralized using industrial sulfuric acid,solution composition:14.90% methanol,6.14% ammonium sulfate, and water content of 78.96%.2、The continuous side distillation of neutralization liquid were simulated by using the RADFRAC rectification modules of ASPEN PLUS chemical industry simulation system, and the conditions of simulation such as outlet plate number, feed stage number,distillate flow rate, reflux ratio and number of column plates on the separation were studied. The experimental apparatus of side-draw distillation was established, and experimental study was carried out on the basis of theoretical simulation data, which was obtained by Aspen Plus simulation. The experimental results showed that the purity of methyl alcohol was 98.35% with the yield of 99.01% and the side withdrawal of COD was 980mg/L, under the conditions of that tower height was 68cm, input height was 32cm, feeding speed was 2g/min, side draw flow rate was 1.4g/min,distillation flow rate was 0.3g/min, and reflux ratio was 3.3、The di-2-ethylhexyl phosphoric acid as complexing agent and benzene as diluent agent was chosen. The influences of initial concentration of nitrogen-containing compound, pH value of wastewater, extractant composition, water-to-oil ratio, stirring time, extraction temperature on nitrogen-containing compound extraction efficiency were investigated.4、In order to find the best extraction ratio under combination of the factors,and study on the application of artificial neural network optimizes of the process conditions of complexation extraction processed in response surface methodology. Then according to the single-factor experimental data of the process conditions of complexation extraction sets up BP artificial neural network models to predict the nitrogen-containing compound extraction efficiency. Last by response surface methodology design and the forecast value of the nitrogen-containing compound extraction efficiency optimize the process conditions of complexation extraction. Result shows that the optimum process conditions were as follows: complexing agent-diluent agent ratio was 2:3, pH value of wastewater was12, water-to-oil ratio was 1:1, temperature was 20℃. Under these conditions the nitrogen-containing compound extraction efficiency increased from 72.51% to 81.23%.the three stage extraction efficiency of nitrogen-containing compound reached 92.5%.5、2.94mol/L HC1 solution was used as stripping agent in the process of back-extraction, back-extraction efficiency of nitrogen-containing compound reached to 91% at oil-to-water ratio 1:1 and obtaining extractant after stripping can be repeatedly used by test verification.