METHOD FOR TREATING USED PLASTICS BY DISSOLVING THE POLYMERS AND PURIFYING THEM BY WASHING

    公开(公告)号:US20240042650A1

    公开(公告)日:2024-02-08

    申请号:US18266646

    申请日:2021-12-02

    Abstract: The present invention relates to a process for treating a plastic feedstock comprising polymers, comprising:



    a) a dissolution step involving placing the plastic feedstock in contact with a dissolution solvent, at a dissolution temperature of between 100° C. and 300° C. and a dissolution pressure of between 1 and 20.0 MPa abs, to dissolve at least a portion of the polymers of the plastic feedstock and to obtain a crude polymer solution;
    b) a step of washing by placing the crude polymer solution in contact with a dense solution, at a temperature of between 100° C. and 300° C., a pressure of between 1 and 20.0 MPa abs and at a mass ratio between the dense solution and the crude polymer solution of between 0.05 and 20.0, to obtain a washed polymer solution and a washing effluent; and then
    c) a step of recovering the polymers, to obtain a solvent fraction and a purified polymer fraction. FIG. 1 to be published

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