72.
    发明专利
    未知

    公开(公告)号:DE10021192A1

    公开(公告)日:2001-11-08

    申请号:DE10021192

    申请日:2000-05-03

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing caprolactam, which is characterized by a) reacting, in the presence of a catalyst, a mixture (I) that contains 6-aminocapronitrile and water in the gaseous phase to give a mixture (II) that contains caprolactam, ammonia, water, high-boiling and low-boiling substances, subsequently b) removing the ammonia from mixture (II), thereby producing a mixture (III) that contains caprolactam, water, high-boiling and low-boiling substances, c) removing the water from mixture (III), thereby producing a mixture (IV) that contains caprolactam, high-boiling and low-boiling substances, and finally d) obtaining by crystallization a caprolactam-containing solid substance (V) from mixture (IV), the weight percentage of caprolactam in the solid substance (V) being higher than in mixture (IV).

    73.
    发明专利
    未知

    公开(公告)号:DE59801060D1

    公开(公告)日:2001-08-30

    申请号:DE59801060

    申请日:1998-03-11

    Applicant: BASF AG

    Abstract: Production of crystalline NaOH . 3.5H2O, involves crystallising NaOH.3.5H2O from an aqueous NaOH solution oversaturated with NaOH . 3.5H2O, and removing the crystals using a mechanical solid/liquid separator. The solid/liquid separation occurs under conditions in which crystalline NaOH.3.5H2O can be liberated from the lye residues; the NaCl content of the crystalline NaOH . 3.5H2O being ≤ 100 mg per kg.

    74.
    发明专利
    未知

    公开(公告)号:DE19926082A1

    公开(公告)日:2000-12-14

    申请号:DE19926082

    申请日:1999-06-08

    Applicant: BASF AG

    Abstract: The invention relates to a method of purifying and producing acrylic acid or methacrylic acid by crystallization. As a result of the crystallization, a crystallized product and a mother liquor is obtained and the crystallized product is washed at a temperature of 15 to 40 DEG C with a wash solution that contains the acid. The invention further relates to a method of producing acrylic acid or methacrylic acid that comprises the above-mentioned purification method.

    75.
    发明专利
    未知

    公开(公告)号:BR9812248A

    公开(公告)日:2000-07-18

    申请号:BR9812248

    申请日:1998-09-18

    Applicant: BASF AG

    Abstract: Phthalides in as-obtained phthalide synthesis reaction mixtures are recovered in pure form by(a) distilling compounds having a boiling point below the boiling point of the phthalide from the reaction mixture, provided such compounds are present in the reaction mixture, to obtain a crude phthalide as bottom product,(b) crystallizing the phthalide from a melt of the crude phthalide.

    76.
    发明专利
    未知

    公开(公告)号:DE19637380C1

    公开(公告)日:1998-04-09

    申请号:DE19637380

    申请日:1996-09-13

    Applicant: BASF AG

    Abstract: The production of neopentyl glycolhydroxypivalate (NPG-HP) granules (I) comprises pouring molten NPG-HP onto a cooling surface so that the melt solidifies, using a melt containing 3 wt.% NPG-HP crystals. Also claimed are: (i) NPG-HP granules (I) obtained by the above process, especially: (a) spherical granules with an average diameter of 3-16 mm; or (b) granules with an average diameter of 20-100 mm and at least two parallel faces 15-30 mm apart; and (ii) the use of a granulating system for the above process, with a precooler (2) for the NPG-HP melt, a precrystalliser (3), and a drop-forming system (4) or a flat spreader to bring the melt onto a cooling belt (6), with a crusher if a flat spreader is used.

    Zpusob cistení taveniny surové kyseliny akrylové

    公开(公告)号:CZ303896B6

    公开(公告)日:2013-06-12

    申请号:CZ20023376

    申请日:2001-04-04

    Applicant: BASF AG

    Abstract: Zpusob cistení taveniny surové kyseliny akrylové, pri kterém se tato surová kyselina mení za pusobení nízkých teplot na suspenzi surové kyseliny akrylové, sestávající se z krystalu kyseliny akrylové a zbytkové taveniny, pricemz krystaly kyseliny akrylové v této suspenzi se zbavují ulpívající zbytkové taveniny na promývací kolone. Krystaly cistsí kyseliny akrylové v suspenzi surové kyseliny akrylové se vytvárejí za prítomnosti vody. Promývací kolona vyuzívá nucený transport krystalu kyseliny akrylové a jako promývací kapalina se pouzívá tavenina krystalu kyseliny akrylové, vycistených na promývací kolone.

    طريقة لتنقية مادة ذائبة من حمض acrylic خام

    公开(公告)号:SA1862B1

    公开(公告)日:2007-07-31

    申请号:SA01220077

    申请日:2001-04-24

    Applicant: BASF AG

    Abstract: الملخص: يتعلقالاختراعالحاليبعملية process لتنقية purification مادةذائبة melt منحمض acrylic خام،فيهاتحولالمادةالذائبةلحمض acrylic الخام،تحتتأثيردرجاتحرارةمنخفضة،إلىمعلقحمض acrylic خاميتكونمنبلوراتحمض acrylic ومادةذائبةمتخلفة،وتصبحبلوراتحمض acrylic فيمعلق- acrylic الخامخاليةمنمادةذائبةمتخلفةمتبقيةفيعمودغسيل،يتمإنتاجبلوراتحمض acrylic منمعلقحمض acrylic الخامفيوجودالماء،ويكونعمودالغسيلهوعمودغسيلبهانتقالمدفوعلبلورات- acrylic ويكونسائلالغسيلالمستخدمهوالمادةالذائبةمنبلوراتحمض acrylic المنقاةفيعمودالغسيل.

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