Microwave For Regeneration Of Wasted Activated Carbon Form The Synthesizing3,4,5,6-tetrachloropyridine-2-carbonitrile And Its Application

Activated carbon has been widely used because of its excellent features. In theindustrial， the used activated carbon was handed improperly, Not only resulted in thewaste of valuable carbon resources, but also pollute the environment and damage theecological. The object of this paper is the waste activated carbon which was used tosynthesis3,4,5,6-tetrachloropyridine-2-carbonitrile. The microwave desorption andmicrowave activation were applied for regeneration waste activated carbon; theactivated carbon after regeneration was compared between fresh activated carbon andconventional thermal regeneration of activated carbon. Finally, do the research for theregeneration of activated carbon to synthesis3,4,5,6-tetrachloropyridine-2-carbonitrileand treat the wastewater of methylene blue by microwave assisted activated carbon asadsorbent.Carry the thermogravimetric analysis technology, single-warming andmulti-warming combination were applied to calculate desorption activation energywith the classic TPD model and the improved TPD model, the outcome were E_d=35.742KJ/mol E_d=32.920KJ/mol, Respectively; and the most probable mechanismfunction as follows:Microwave desorption to recover chloride experimental conditions wereoptimized by orthogonal experimental design, the optimal experimental conditions:irradiation time of30min, the radiated power is800W, the feeding amount of8g,chloride recycling rate of11.25%; the influence of experimental conditions forchloride recoveries: the radiation power (W)> radiation time (min)> cast quantity (g).The rotating central composite experimental design method was used to guideexperiment, the response surface was applied to analysis experimental results, theoptimal software activation conditions: the radiation time of376s, the water vaporflow rate of60g/min, feeding amount of8.0g. Under these conditions, theregeneration of activated carbon yield of the predicted values and the experimentalvalues were78.40%,75.44%,respectively; Iodine the predicted and experimentalvalues were1322.3mg/g, and1337.1mg/g, respectively.The regeneration yieldrelative error of3.77%, activated carbon Iodine value relative error of1.11%.Particle size of microwave regeneration of activated carbon and conventionalthermal regeneration of activated carbon were slightly larger than the freshly activatedcarbon’s; the mechanical strength of microwave regeneration of activated carbon asgood as fresh activated carbon was; the specific surface area and pore volume ofmicrowave regeneration of activated carbon and the conventional thermalregeneration of activated carbon were similar but greater than the fresh one’s.Compared microwave heating method with the traditional heating method, inthe process of desorption, within the test range, the energy consumption of microwaveheating method was higher than traditional heating method, the energy consumption of the continuous traditional heating desorption was much lower, this method wasrecommended. In the process of activation, within the test range, microwave heatingmethod has more significantly advantages in the energy consumption wasrecommended.Regeneration of activated carbon as the catalyst for the catalytic synthesis3,4,5,6-tetrachloropyridine-2-carbonitrile synthesis, The reaction was continued for11hours, the quality of3,4,5,6-tetrachloropyridine-2-carbonitrile synthesis was morethan99%. Regeneration of activated assisted microwave treat wastewater ofmethylene blue, the experiments show that the microwave radiation power of800W,radiation time of6min, activated carbon feeding amount of10g/L, the removal ratesof Static removal of methylene blue wastewater up to99%; Langmuir-Hinshelwoodkinetics model was employed to analysis the kinetic of treatment wastewater ofmethylene blue, obtained the reaction rate constant k=250min-1, the apparentadsorption rate constant K=0.00219L/mg, and the correlation coefficient R=0.9998;what more, the laws of continuous microwave assisted activated carbon treatmethylene blue wastewater were discussed.The experiments show that using the microwave method to regenerationactivated carbon, regeneration of activated carbon reached quality of fresh activatedcarbon, activated carbon cycle recycling can be achieved, which makes it the valuablecarbon resources can be recycled, control environmental pollution and ecologicaldamage,, at the same time, reduce the cost of production,which not only in line withthe basic requirements of building a socialist harmonious society, but also resourcesand environment, and economic efficiency as well as social responsibility.