METHOD FOR PURIFYING A RECYCLE STREAM FROM A SYSTEM FOR PRODUCING POLYARYLENE ETHER SULFONES
    1.
    发明申请
    METHOD FOR PURIFYING A RECYCLE STREAM FROM A SYSTEM FOR PRODUCING POLYARYLENE ETHER SULFONES 审中-公开
    法净化循环流从植物为生产聚芳

    公开(公告)号:WO2014102309A2

    公开(公告)日:2014-07-03

    申请号:PCT/EP2013078028

    申请日:2013-12-27

    Applicant: BASF SE

    CPC classification number: C08J11/02 C08J2381/06

    Abstract: Proposed is a method for purifying a recycle stream (1) from a system for producing polyarylene ether sulfones by the polycondensation of aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali metal- or ammonium carbonate or -hydrogen carbonate in an N-alkyl-2-pyrrolidone as a solvent, containing 60 to 90% by weight water, 10 to 40% by weight N-alkyl-2-pyrrolidone and, as a specification-detrimental impurity, up to 5000 ppm by weight of the alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and, in addition, up to 1000 ppm by weight additional high boilers relative to N-alkyl-2-pyrrolidone, in particular inorganic salts, each relative to the total weight of the recycle stream (1), the sum of the components being 100% by weight, to obtain a purified N-alkyl-2-pyrrolidone stream (2) that can be fed back into the system for producing polyarylene ether sulfones by purification by distillation in a purification column (K). Said method is characterized in that a prepurification step by evaporation in one or more evaporator stages is provided upstream of the purification by distillation in order to reduce the content of inorganic salts, one or more vapor streams (3, 4, 5) being obtained which are fed to the purification column (K) as feed streams. The bottom stream is discharged from the last evaporator stage and the bottom stream from the purification column (K) is entirely recycled into the last evaporator stage. The vapor stream (5) from the last evaporator stage is partially or entirely fed to an additional column (ZK) from which a top stream is removed, which is is fed to the purification column (K), and a bottom stream, which is discharged.

    Abstract translation: 公开了一种用于从对聚亚芳基醚砜的她的位置的植物由芳香族bishalogen化合物和芳族双酚类或它们的盐的缩聚中的至少一种碱金属或铵的碳酸盐或碳酸氢盐的N-烷基存在纯化的循环物流(1)的方法 -2-吡咯烷酮作为含有从-60至90重量%的水,-10〜40%(重量)的N-烷基-2-吡咯烷酮和按重量计的N-烷基-2-吡咯烷酮的规范有害污染高达5000ppm的溶剂 相应的烷基琥珀酰亚胺和偏离高达1000重量ppm进一步高沸点相比,N-烷基-2-吡咯烷酮,特别是无机盐,基于在每种情况下对循环流(1)的总重量,其中组分的总和与wt第100% 结果,以获得纯的N-烷基-2-吡咯烷酮流(2),它可以在该植物中生产聚亚芳基醚砜的在回收,通过蒸馏纯 纯化塔(K),其特征在于通过在一个或多个蒸发级的预清洗通过蒸发,通过蒸馏纯化之前降低无机盐,其特征在于,一个或多个蒸汽流(3,4,5)获得的内容,作为一个进料流 纯化塔(K)被馈送,其中从最后一个蒸发器阶段的塔底物流被排出并从纯化塔(K)的塔底物流被完全再循环至最终蒸发阶段,并且其中从全部或部分的附加列的最后一个蒸发器级(蒸气流(5)ZK )从塔顶料流供给被分离,净化塔(K)的进料,和底部流被排出。

    Verfahren und Anlage zur Rückgewinnung von Acrylsäure

    公开(公告)号:DE102014114193A1

    公开(公告)日:2015-08-13

    申请号:DE102014114193

    申请日:2014-09-30

    Applicant: BASF SE

    Abstract: Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Rückgewinnung von Acrylsäure, umfassend die Schritte a) Teilen eines temperierten Muttersäurestroms aus einer Kristallisationsvorrichtung in Richtung einer Absorptionskolonne (201) und in Richtung einer Spaltkolonne (205), b) Zuführen des ersten temperierten Muttersäure-Teilstroms als Rücklauf zu dem obersten Boden der Spaltkolonne (205), c) Zuführen zumindest eines Stripgasstroms unterhalb des untersten Bodens der Spaltkolonne (205), d) Zuführen eines oligomere Acrylsäure umfassenden Nebenkomponentenstroms aus der Kondensationskolonne (201) zu einem mittleren Boden der Spaltkolonne (205), e) Aufspalten zumindest eines Teils der oligomeren Acrylsäure aus dem Nebenkomponentenstrom in der Spaltkolonne (205) unter Erhalt von monomerer Acrylsäure, f) Abtrennen der im Nebenkomponentenstrom enthaltenen Nebenkomponenten durch Gegenstromrektifikation in der aufgesetzten Spaltkolonne (205) g) Abführen der monomeren Acrylsäure ohne Kondensation als Gasgemisch mit dem zugeführten Stripkreisgasstrom am Kopf der Spaltkolonne (205) und h) Zuführen des Gasgemischs unterhalb des untersten Bodens der Kondensationskolonne (201). Die vorliegende Erfindung betrifft ferner eine Anlage (1) zur Rückgewinnung von Acrylsäure.

    METHOD FOR PRODUCING ACRYLIC ACID FROM ETHANOL AND FORMALDEHYDE

    公开(公告)号:ZA201302644B

    公开(公告)日:2014-05-25

    申请号:ZA201302644

    申请日:2013-04-12

    Applicant: BASF SE

    Abstract: A process for preparing acrylic acid from ethanol and formaldehyde, in which, in a reaction zone A, the ethanol is partially oxidized to acetic acid in a heterogeneously catalyzed gas phase reaction, the product gas mixture A obtained and a formaldehyde source are used to obtain a reaction gas input mixture B which comprises acetic acid and formaldehyde and has the acetic acid in excess over the formaldehyde, and the formaldehyde present in reaction gas input mixture B is aldol-condensed with acetic acid present in reaction gas input mixture B to acrylic acid under heterogeneous catalysis in a reaction zone B, and unconverted acetic acid still present along-side the acrylic acid target product in the product gas mixture B obtained is removed therefrom, and the acetic acid removed is recycled into the production of reaction gas input mixture B.

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