Study On Heat-sensitivity Of Acrylic Acid And The Process Of Recycling Of AA

Large amount of exper iments on the heat-sensitivit y of acrylic acid(AA, mono mer) were studied by methods of Single Factor and OrthogonalFactors. Through regression i n data processing of experi ments,polymer izat ion(mainly dimers) curves vs. temperature and heated timewere gained, and the Stabilit y Indexes (Is) and Energy Factor (a) for AArespectively as well, which can be used as the reference to designing ofthe separation equipment and operat ion parameters. Further more, therma lpolymer izat ion of AA in water and toluene solution was invest igated dueto its important influence in the AA refining process. The results showthat temperature, residence time and inhibitor cannot completely preventfro m polymer ization of AA but reducing the ratio of the polymer.As we know, acr ylic acid dimers are easily deco mposed into acr ylicacid mono mer at higher temperature. So some cracking exper iments o fthe dimer prepared by our laboratory were gone through to find theappropr iate operation condit ions including heated temperature andresidue time in this paper. Finally, acrylic acid recovery tr ial operatio nwere well performed through the apparatus which can be operated undervacuum condition and Dowther m as heat ing medium, which near ly recoverthe total AA in the distilled residue gotten fro m AA production plant.In the end, Aspen Plus process simu lat ion software was used to studyon the influencing factors of AA po lymerization in the refining processby means of react ion distillation simulat ion. Var ious factors influencedon the po lymerization (mainly dimers) were discussed, and a set ofworthwhile curves were received.