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25 条记录 (耗时 0.016 秒)

    Process for the purification of 4-acetoxystyrene
    11.
    发明授权
    Process for the purification of 4-acetoxystyrene 失效
    4-乙氧基苯乙烯的纯化方法

    公开(公告)号：US5136083A

    公开(公告)日：1992-08-04

    申请号：US575513

    申请日：1990-08-30

    申请人： Jack Chosnek ,  George E. Beck ,  Donna L. Keene ,  Siegbert Rittner ,  Volker Hautzel

    发明人： Jack Chosnek ,  George E. Beck ,  Donna L. Keene ,  Siegbert Rittner ,  Volker Hautzel

    IPC分类号： C07C37/84 ,  C07B63/00 ,  C07C67/52 ,  C07C69/157

    CPC分类号： C07C67/52

    摘要： The present invention relates to a process for the purification of 4-acetoxystyrene from a crude product mixture comprising 4-acetoxystyrene and typically 5 or more contaminants in substantial amount.The crude product mixture is purified by melt crystallization by cooling the mixture to a temperature ranging from about +8.degree. C. to about -50.degree. C., whereby at least a first portion of the mixture is crystallized; removing the liquid remaining from contact with the crystallized first portion of the mixture; and, subsequently slowly heating the crystallized first portion, while simultaneously removing liquid which forms due to the heating, whereby impurities contained in the liquid which forms are removed from the crystallized first portion.Surprisingly, despite the large number of contaminants present, and use of the process to purify crude product mixtures containing as little as 50% by weight 4-acetoxystyrene, purities as high as 99.9% by weight have been obtained using multiple melt-crystallization steps of the process of the invention.

    Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and process for the preparation thereof
    12.
    发明授权
    Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and process for the preparation thereof 失效
    2-羟基萘-6-羧酸的二恶烷加成物及其制备方法

    公开(公告)号：US4925959A

    公开(公告)日：1990-05-15

    申请号：US349579

    申请日：1989-05-09

    申请人： Helmold von Plessen ,  Siegbert Rittner

    发明人： Helmold von Plessen ,  Siegbert Rittner

    IPC分类号： C07C51/00 ,  C07C65/11 ,  C07C65/24 ,  C07D319/12 ,  C08G63/06

    CPC分类号： C07D319/12 ,  C07C65/11

    摘要： The invention relates to the dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid which adduct comprises 1 mol of 1,4-dioxane and about 2 mol of 2-hydroxynaphthalene-6-carboxylic acid per mol. The invention further relates to a process for the preparation of this adduct, wherein the 2-hydroxynaphthalene-6-carboxylic acid is dissolved in dioxane or a mixture thereof with water or with an organic solvent and then allowed to crystallize.

    摘要翻译： 本发明涉及2-羟基萘-6-羧酸的二恶烷加合物，该加合物包含1mol 1,4-二恶烷和约2mol 2-羟基萘-6-羧酸/ mol。 本发明还涉及一种制备该加合物的方法，其中2-羟基萘-6-羧酸溶于二恶烷或其与水或有机溶剂的混合物中，然后使其结晶。

    Process for separating off enol ethers from reaction mixtures containing alcohols
    17.
    发明授权
    Process for separating off enol ethers from reaction mixtures containing alcohols 失效
    从含有醇的反应混合物中分离出烯醇醚的方法

    公开(公告)号：US5013444A

    公开(公告)日：1991-05-07

    申请号：US576934

    申请日：1990-08-29

    申请人： Hilmar Mildenberger ,  Stephen Lachhein ,  Siegbert Rittner ,  Heribert Tetzlaff

    发明人： Hilmar Mildenberger ,  Stephen Lachhein ,  Siegbert Rittner ,  Heribert Tetzlaff

    IPC分类号： C07C29/86 ,  C07C31/02 ,  C07C31/04 ,  C07C41/38 ,  C07C43/15

    CPC分类号： C07C41/38

    摘要： The invention relates to a gentle process for the separation of enol ethers from mixtures containing water-soluble alcohols by extraction, wherein an aqueous solution of a base is used as the extraction agent in a phase ratio of the amounts of the aqueous phase: enol ether/alcohol mixture of at least 0.5:1 and the extraction is carried out in several stages or continuously with a theoretical number of stages of at least two. The process is particularly suitable for separating off enol ethers which readily decompose during distillation.

    摘要翻译： 本发明涉及一种用于通过萃取从烯醇醚与含有水溶性醇的混合物中分离出温和的方法，其中将碱的水溶液用作提取剂，其水相量为：烯醇醚 /醇混合物至少为0.5：1，萃取过程分几个阶段或连续进行，理论数量为至少两个阶段。 该方法特别适用于分离在蒸馏过程中容易分解的烯醇醚。

    Process for separating organic constituents from waste gases of the production of aromatic intermediates
    18.
    发明授权
    Process for separating organic constituents from waste gases of the production of aromatic intermediates 失效
    分离有机成分与废气生产芳香族中间体的方法

    公开(公告)号：US4923485A

    公开(公告)日：1990-05-08

    申请号：US291515

    申请日：1988-12-29

    申请人： Ernst Horoldt ,  Richard Grimm ,  Siegbert Rittner ,  Herbert Kuckertz ,  Wilfried Billmann

    发明人： Ernst Horoldt ,  Richard Grimm ,  Siegbert Rittner ,  Herbert Kuckertz ,  Wilfried Billmann

    IPC分类号： B01D53/14 ,  B01D53/54 ,  B01D53/70 ,  B01D53/72 ,  B01D53/77 ,  B01D19/00

    CPC分类号： B01D53/72 ,  B01D53/1493

    摘要： A process for the separation of undesired organic ingredients from waste gases which are formed in the preparation of aromatic intermediates which comprises washing the waste gases with a washing liquid comprising(a) paraffinic hydrocarbons having from 10 to 20 carbons atoms or(b) diisopropylnaphthalene or a mixture of isomers thereof having the sum formula C.sub.16 H.sub.20, an average molecular weight in the range of from 210 to 215, a boiling range in the range of from 290 to 300.degree. C. (according to DIN 51 761) and a flash point above 130.degree. C. (according to DIN 51 758).at a temperature in the range of from 0 to 50.degree. C. to remove the said undesired organic ingredients.

    摘要翻译： 一种用于在芳香族中间体的制备中形成的不需要的有机成分与废气分离的方法，其包括用洗涤液洗涤废气，所述洗涤液包含（a）具有10至20个碳原子的链烷烃，或（b）二异丙基萘或 具有总计式C16H20，平均分子量为210-215，沸点范围为290-300℃（根据DIN 51761）和上述闪点的异构体的混合物 130℃（根据DIN 51 758）。 在0至50℃的温度范围内，以除去所述不期望的有机成分。

    Process for the preparation of aromatic hydroxy carboxylic acids
    20.
    发明授权
    Process for the preparation of aromatic hydroxy carboxylic acids 失效
    芳香族羟基羧酸的制备方法

    公开(公告)号：US5643494A

    公开(公告)日：1997-07-01

    申请号：US456499

    申请日：1995-06-01

    申请人： Siegbert Rittner ,  Hans-Martin Ruffer ,  Jorg Schmid ,  Thomas Wisser

    发明人： Siegbert Rittner ,  Hans-Martin Ruffer ,  Jorg Schmid ,  Thomas Wisser

    IPC分类号： C07B61/00 ,  C07C51/10 ,  C07C51/14 ,  C07C65/03 ,  C07C65/11 ,  C07C65/21 ,  C07C65/24 ,  C07C227/02 ,  C07C229/64 ,  C07C229/70 ,  C09K3/00

    CPC分类号： C07C51/10

    摘要： A process for the preparation of aromatic hydroxy carboxylic acids by reacting alkali metal phenolates or alkali metal naphtholates with alkali metal carbonates and carbon monoxide, with subsequent acidification, wherein the solid starting materials--alkali metal carbonate and/or alkali metal phenolate or naphtholate--are metered into the reaction mixture in the form of one or more dispersions in an inert organic liquid.The process according to the invention enables the preparation of aromatic hydroxy carboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as described for example for the Kolbe-Schmitt reaction in EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, and for the reaction with CO and carbonate in, for example, WO 91/11422, are unnecessary.

    摘要翻译： 一种通过碱金属酚盐或碱金属碳酸盐和一氧化碳与碱金属碳酸盐和一氧化碳反应制备芳族羟基羧酸的方法，随后酸化，其中固体原料 - 碱金属碳酸盐和/或碱金属酚盐或萘甲酸盐是 在惰性有机液体中以一种或多种分散体的形式计量加入到反应混合物中。 根据本发明的方法能够以良好的产率和高的化学选择性制备芳族羟基羧酸。 增加选择性的附加措施，例如在EP-A 0 053 824，EP-A 0 081 753和EP-A 0 254 596中描述的Kolbe-Schmitt反应，以及与CO和碳酸酯在 例如WO 91/11422，是不必要的。