88.
    发明专利
    未知

    公开(公告)号:AT483676T

    公开(公告)日:2010-10-15

    申请号:AT04716587

    申请日:2004-03-03

    Applicant: BASF SE

    Abstract: Process for preparing high-concentration gaseous formaldehyde having a molar CH 2 O:H 2 O ratio of >=0.6 from an aqueous formaldehyde solution by evaporation of at least part of the solution, in which the aqueous formaldehyde solution is heated to a vaporization temperature T and the gas phase formed is taken off, wherein the evaporation temperature T obeys the relationship: T[° C.]>=T' min [° C.] where T' min (c)=A+Bx(c/100)+Cx(c/100) 2 +Dx(c/100) 3 and A=+68.759, B=+124.77, C=-12.851, D=-10.095, where c is the instantaneous CH 2 O content of the aqueous formaldehyde solution during the evaporation in percent by weight and is from 20 to 99% by weight.

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