Design Of Reactor With High Temperature And Pressure And Experimental Analysis Of Rubber Permeability

At present the method of high temperature and pressure dynamicdesulfurization was widely used in waste rubber reclaiming, which cancause secondary pollution in the process of production, for example, wastewater and exhaust together with energy consumption, high risk. In order touse twin-screw extruder to realize waste rubber continuousdesulphurization recycling,which can achieve the purpose of energyconservation, emissions, highly effective, and environmental protection,we should optimize design twin-screw extruder parameters, and firstlyfind the key technology that explore the permeability regulation ofsolvents in the rubber caused by temperature, pressure, time and so on.Therefore a high temperature and pressure reactor was designed to studythe effect of temperature, pressure and time to permeability of rubber.A reactor with pressure of7.7MPa and temperature of280, whichhave the function of smooth heating, turns continuously, convenientdisassembly and assembly and accurately control temperature and pressurewas designed to simulate all kinds of working condition in the twin-screwextruder. Based on the experiment device, the rubber permeability methodof increasing weight, infiltration distance is proposed, at the same time,corresponding curves accordance to the different conditions are maken.We got the conclusion that pressure have no obvious effect on therubber permeability, on the contrary, temperature have obvious effect. Theinfluence of time is almost a linear change. However, when the sample ispenetrated completely, there is no change of the sample mass and the influence of time decrease gradually and flattened eventually with theincreasing of time.Based on the experiment data and Arrhenius equation, we put forwardthe rubber penetration experienced model, which indicates that pressurehas no effect on rubber permeability and there is a regulation between thetemperature and rubber permeability. Permeability and infiltration capacitywith tolerance less than10%.are predicted by this model under thecondition of all kind of temperature.The results of simulating cyclohexane molecules's mean squaredisplacement changes versus time in polyisoprene and calculating thediffusion coefficient of cyclohexane in polyisoprene at differenttemperatures and pressures by molecular dynamics simulation accord withregular rules that we get from our experiments. Therefore, it proved theresults obtained from our experiments and the model we proposedreasonable.The results that we obtained from the experimental data not onlyoptimize parameters design of twin screw extruder to realize waste rubberrecycling, but also guide processing production. At the same time, rubberpermeability model was provided according to the basis of experimentaldata. All in all, there is a great value for engineering practical and sciencetheory.