Eliminates PMMA Decompostion Craft Waste Gas By Activecarbon Adsorption

The research focused on the selection of a sorbent which could beadsorption functions for VOCs waste gas treatment and provided the besttechnical conditions issues from plexiglass recycling regenerationindustry in Zhejiang Province. Based on the experiment data, the rule ofcompetition adsorption phenomenon for the active carbon treatmentprocess would be future dicussed in the paper.Firstly, the research chose active carbon as the sorbent for adsoptionand systematically analyzed the inlet gas flow component methylmethacrylate in the aspects of concentration, bed temperature level, thegas space velocity and the relative humidity to influence of adsorptionconditions by active carbon. And the active carbon redundantreproductive properties are inspected as well. The results show activecarbon has a better performance in methyl methacrylate. Under thecondition of dry gas flow, it adsorbed 0.234g/g on condition that theconcentration was 1000mg/m3. However, adsorptive capacity declinedobviously when the concentration was less than 1000mg/m3. Morever, the humidity influenced on adsorptive capacity of active carbon as well. When the relative humidity was 50%, the active carbon still maintained its adsorption quantity above to 80% for the MMA adsorption. Increasing the concentration is advantageous to active carbon for adsorption MMA with in vapor. Due to the exothermic process for active carbon adsorptive methyl methacrylate, adsorption would have a better performance in 0℃, and it would be negative for active carbon adsorptive methyl methacrylate with ambient temperature elevates. According to the experiment data, the best technical conditions for active carbon adsorption of MMA are: 1000mg/m3, 30000 mL/(h·g),30℃.Through repeatedly regeneration inspection, the adsorptive capacity of active carbon was not obviously declined which indicated that its regeneration function is good.Then, the research focused on competition adsorption performance of active carbon and modified active carbon to methyl methacrylate, ethyl acetate, methyl formate, methyl acrylate. The result showed that selective adsorption on active carbon is related to organic melt point, boiling point, the polarity and the active carbon surface groups nature.The lower organic matter melt point and the higher boiling point, stronger VOCs member nonpolar tendency would have, the adsorption by active carbon was much easilier in the competition adsorption process. The above organic matters adsorption capacity from strong to weak: methyl methacrylate > methyl acrylate > ethyl acetate > methyl formate. After modified process, the changing of active carbon suiface functional group would change. With acid modified processing, the active carbon surface alkalinity groups would reduce, and it would enhance active carbon selectivity of strong absorbent to the ester compound competition adsorption. Alkali modification processing is opposite the result to acid modified processing. It would help provide a design of many segments to adsorb craft according to the above-mentioned condition, for handle actual craft waste gas.