Preparation And Characterization Of Energy Storage Polystyrene Adsorbent

In recent years,volatile organic compounds(VOCs)have become the cause of many types of air pollution.At present,the commonly used method for treating VOCs is the adsorption method,which not only has the advantages of simple operation,but also can recycle the adsorbed VOCs.The polymer resin in the adsorbent has the characteristics of adjustable pore structure,large specific surface area,etc.,and has been widely used in many fields.However,the polymer resin emits a lot of heat during its adsorption process,which reduces the adsorption capacity of the adsorbent,and may also cause the adsorption column to catch fire and explode.In the vacuum desorption process,the endothermic heat causes the temperature to drop sharply,resulting in the desorption of VOCs.Difficult,not conducive to the regeneration of the adsorbent,and reduces the adsorption-desorption efficiency of the adsorbent.In order to solve the above problems,it is urgent to develop a new type of adsorbent with heat storage capacity.Phase change energy storage microcapsules(MEPCM)are microcapsule particles formed by encapsulating phase change materials(PCMs)such as paraffin in organic polymers.PCMs will undergo a phase change when the external temperature changes,and this process is often accompanied by a change in energy.Therefore,the MEPCM is compounded on the adsorbent resin to prepare a polymer adsorbent with energy storage capacity,which can effectively solve the exothermic-endothermic problem in the adsorption-desorption process of the adsorbent.In this experiment,the suspension polymerization method was used to compound the phase change energy storage microcapsules with paraffin as the core material on the polystyrene adsorbent to prepare the energy storage polystyrene adsorbent,and to enlarge it on the basis of the small-scale experiment.The exploration of the process resulted in a simple amplification experiment route.Through optical microscope,differential scanning calorimetry(DSC),etc.,its morphology,heat storage capacity and other properties were characterized.In this experiment,styrene was used as the monomer,and the phase-change energy storage microcapsules and polystyrene adsorbent were successfully compounded by the suspension polymerization method to prepare the heat storage polystyrene adsorbent.And by changing the experimental conditions of dispersant content,stirring speed,crosslinking agent content and other experimental conditions to explore the best synthesis route:when the reaction speed is 150 rpm,styrene(St)12.0 g,divinylbenzene(DVB)4.0 g,pore formation N-heptane 6.0 g,dispersant polyvinyl alcohol(PVA)0.5 g,sodium chloride(Na Cl)4.0 g and 500 mg/L methylene blue solution 0.8 m L,58#MEPCM was prepared under the experimental conditions with 5.0 g added The new adsorbent has good sphericity,large particle size(approximately in the range of 500-1000μm),specific surface area of 54.56 m~2/g,average pore diameter of 17.58 nm,and phase change latent heat value of 12.33 J/g.This experiment is based on a small-scale experiment,adopts the suspension polymerization method,uses 44#phase change energy storage microcapsules(44#MEPCM)as the raw material,carries on the preparation energy storage type polystyrene adsorbent(44#MEPCM-PS)scale-up experiment of inquiry.The ratio is magnified by 10 times.By changing the content of DVB,the amount of microcapsules,and the different mass ratios of the mixed porogen,the stirring speed is 150 rpm,St is 120.0 g,DVB content is 30.0 g,44#MEPCM is 120.0 g,porogen toluene 10.0 g and n-heptane The energy storage adsorbent(44#MEPCM-PS)prepared at 50.0 g has good sphericity,concentrated particle size distribution,with an average particle size of 700μm,concentrated in 500-1000μm,and a latent heat value of 16.64 J/g.The surface area is 50.96 m~2/g,and the average pore size is 17.36 nm.The cost is calculated,and the experimental preparation cost is about 371.14 yuan/kg,and other factors are not considered.According to this proportion of industrial production,the total cost of materials is calculated to be 39,400 yuan/ton.