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    • 2. 发明授权
    • Method for removing formic acid from aqueous solutions
    • 从水溶液中除去甲酸的方法
    • US07179388B2
    • 2007-02-20
    • US10473203
    • 2002-06-10
    • Thomas Nöbel
    • Thomas Nöbel
    • C02F1/00
    • C07C45/33C07C29/80C07C29/88C07C45/85C07C2601/14C07C49/403C07C35/08
    • Formic acid is at least partly removed from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol by decomposition over certain decomposition catalysts.The method is preferably used for processing reaction products from the oxidation of cyclohexane and comprises: (i) extracting a product gas mixture obtained in the oxidation of cyclohexane with an aqueous scrubbing liquid, (ii) separating the aqueous solution obtained in (i) by distillation into an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol together with further minor organic components and a carboxylic acid mixture (iii) removing the formic acid at least partially from the aqueous solution obtained in (ii) by decomposition, and (iv) further processing the aqueous solution obtained in (iii) to give epsilon-caprolactam, or using the aqueous solution obtained in (iii) as scrubbing liquid in (i).
    • 通过某些分解催化剂的分解,甲酸至少部分地从包含甲酸,环己酮和环己醇的水溶液中除去。 该方法优选用于处理来自环己烷氧化的反应产物,并包括:(i)用水洗涤液萃取在环己烷氧化中获得的产物气体混合物,(ii)将(i)中获得的水溶液 蒸馏成包含甲酸,环己酮和环己醇的水溶液以及其它少量有机组分和羧酸混合物(iii)至少部分地通过分解从(ii)中获得的水溶液中除去甲酸,和(iv)进一步 加工(iii)中得到的水溶液得到ε-己内酰胺,或者使用(ⅲ)中得到的水溶液作为(i)中的洗涤液。
    • 5. 发明授权
    • Method for producing hexanediol
    • 己二醇的制备方法
    • US06727395B1
    • 2004-04-27
    • US10018338
    • 2001-12-19
    • Frank SteinThomas KrugThomas NöbelHarald Rust
    • Frank SteinThomas KrugThomas NöbelHarald Rust
    • C07C2700
    • C07C29/149C07C31/20
    • A process for preparing 1,6-hexanediol from a carboxylic acid mixture comprising adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols which is obtained as by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol after water extraction of the reaction mixture followed by extraction with aqueous sodium hydroxide solution, by esterification of the acids and hydrogenation comprises a) liberating the carboxylic acids from the alkaline extract by addition of a mineral acid, b) fractionating the organic phase comprising carboxylic acids to give a distillate comprising the low molecular weight monocarboxylic acids and a residue comprising adipic acid and 6-hydroxycaproic acid, c) reacting the monocarboxylic an dicarboxylic acids present in the aqueous dicarboxylic acid mixture with a low molecular weight alcohol to give the corresponding carboxylic esters, d) freeing the esterification mixture obtained of excess alcohol and low boilers in a first distillation step, e) fractionating the bottom product in a second distillation step to give an ester fraction essentially free of 1,4-cyclohexanediols and a fraction comprising at least the major part of the 1,4-cyclohexanediols, f) catalytically hydrogenating the ester fraction which is essentially free of 1,4-cyclohexanediols and g) isolating 1,6-hexanediol from the hydrogenation product in a manner known per se in a final distillation step.
    • 从包含己二酸,6-羟基己酸和少量1,4-环己二醇的羧酸混合物制备1,6-己二醇的方法,其在水提取后在环己烷氧化成环己酮/环己醇时作为副产物获得 的反应混合物,然后用氢氧化钠水溶液萃取,通过酸的酯化和氢化反应,包括a)通过加入无机酸从碱性提取物中释放出羧酸,b)将包含羧酸的有机相分馏得到馏出物 包括低分子量单羧酸和包含己二酸和6-羟基己酸的残基,c)使一元羧酸与二羧酸混合物中存在的二羧酸与低分子量醇反应,得到相应的羧酸酯,d)释放 在第一馏出物中获得过量酒精和低锅炉的酯化混合物 e步骤,e)在第二蒸馏步骤中分馏底部产物,得到基本上不含1,4-环己烷二醇的酯馏分和至少包含大部分1,4-环己烷二醇的馏分,f)催化氢化酯 基本上不含1,4-环己烷二醇的馏分,和g)在最终蒸馏步骤中以本身已知的方式从氢化产物中分离出1,6-己二醇。