63.
    发明专利
    未知

    公开(公告)号:FR2227049B1

    公开(公告)日:1978-08-04

    申请号:FR7414646

    申请日:1974-04-26

    Abstract: A process is described for the regeneration of palladium metal catalysts which are useful in the process for the synthesis of esters from olefins, carboxylic acids and molecular oxygen. The regeneration process comprises the following sequential steps: (a) washing the used catalyst with an aqueous hydrochloric acid solution containing hydrazine; (b) partially drying the catalyst to a moisture content of about 65 to 95% of saturation; (c) chlorinating the partially dried catalyst with chloride gas; (d) treating the chlorinated catalyst with moist air to remove excess chlorine and to insure even moisture distribution; (e) reducing the chlorinated catalyst by contact with an aqueous alkaline reducing solution; (f) washing the reduced catalyst to remove residual chlorides; and (g) drying the resulting regenerated catalyst. One particular application for the process is the regeneration of an alumina supported palladium metal-containing catalyst which has been employed in the vapor phase synthesis of unsaturated esters from olefins, organic acids and oxygen.

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