METHOD FOR PRODUCING HIGHLY CONCENTRATED FORMALDEHYDE SOLUTION

    公开(公告)号:MY139807A

    公开(公告)日:2009-10-30

    申请号:MYPI20050531

    申请日:2005-02-14

    Applicant: BASF AG

    Abstract: A PROCESS FOR PREPARING A HIGH-CONCENTRATION FORMALDEHYDE SOLUTION BY REMOVING WATER FROM A LOWER-CONCENTRATION FORMALDEHYDE SOLUTION HAVING A FORMALDEHYDE CONTENT OF FROM 5 TO 50% BY WEIGHT, IN WHICH THE LOWER-CONCENTRATION FORMALDEHYDE SOLUTION IS FED TO A PREHEATER AND HEATED IN THE PREHEATER, DEPESSURIZED VIA A PRESSURE MAINTENANCE DEVICE AND CONCENTRATED IN A HELICAL TUBE EVAPORATOR TO GIVE A VAPOR STREAM AND THE HIGH-CONCENTRATION FORMALDEHYDE SOLUTION AS BOTTOM STREAM, WHEREIN THE HEATED LOWER-CONCENTRATION FORMALDEHYDE SOLUTION IS DEPRESSURIZED IN THE PRESSURE MAINTENANCE DEVICE TO GIVE A TWO-PHASE MIXTURE WHICH IS FED INTO THE HELICAL TUBE EVAPORATOR, IS PROPOSED.

    7.
    发明专利
    未知

    公开(公告)号:AT298340T

    公开(公告)日:2005-07-15

    申请号:AT02010129

    申请日:2002-05-10

    Applicant: BASF AG

    Abstract: Purification of triethylene diamine (TEDA) comprises crystallization and extraction of the resulting mother liquor with an extraction agent that is at most only slightly miscible with the solvent of the mother liquor but in which TEDA is soluble. Following extraction, the treated mother liquor with reduced TEDA content and/or the extraction agent enriched in TEDA is recycled to the process. A process for the purification of triethylene diamine (TEDA) by evaporation and feeding the TEDA vapor to a liquid solvent followed by crystallization is characterized in that following crystallization of the TEDA the resulting mother liquor is extracted with an extraction agent that is at most only slightly miscible with the solvent of the mother liquor but in which TEDA is soluble. Following extraction, the treated mother liquor with reduced TEDA content and/or the extraction agent enriched in TEDA is recycled to the process.

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