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    • 34. 发明申请
    • PROCESS FOR PREPARING ISOCYANATES BY THERMAL DISSOCIATION OF CARBAMATES
    • 通过热分解碳酸酯制备异氰酸酯的方法
    • US20110178329A1
    • 2011-07-21
    • US13008457
    • 2011-01-18
    • Michael BOCKAxel FranzkeRobert BaumannEckhard Stroefer
    • Michael BOCKAxel FranzkeRobert BaumannEckhard Stroefer
    • C07C263/04
    • C07C263/04C07C265/14
    • The invention relates to a process for preparing isocyanates by thermal dissociation of carbamates and separation by distillation of the reaction mixture from the carbamate dissociation, comprising the corresponding isocyanate and the corresponding alcohol, by distillation in a column (K) having an enrichment section (V) and a stripping section (A), where the carbamate (1) is introduced between the enrichment section (V) and the stripping section (A) and the isocyanate is taken off as a constituent of the bottom stream (2) and the alcohol is taken off as a constituent of the overhead stream (3) from the column (K), in the presence of an inert solvent, wherein an intermediate boiler having a boiling point between the boiling point of the isocyanate and the boiling point of the alcohol under the operating conditions of the carbamate dissociation is used as inert solvent and is fed as external runback (4) in liquid form in a purity of >95% by weight, based on the total weight of the external runback (4), in the upper region of the enrichment section (V) and as gaseous, superheated stream (5) into the lower region of stripping section (A) at one or more points.
    • 本发明涉及一种通过氨基甲酸酯的热解解制备异氰酸酯的方法,并且通过在具有富集部分(V)的塔(K)中蒸馏,将反应混合物从氨基甲酸酯解离(包括相应的异氰酸酯和相应的醇)中蒸馏分离 )和汽提段(A),其中将氨基甲酸酯(1)引入富集部分(V)和汽提部分(A)之间,异氰酸酯作为底部流(2)的组分和醇 在惰性溶剂的存在下从柱(K)中作为塔顶馏出物(3)的组分脱去,其中沸点介于异氰酸酯的沸点和醇的沸点之间的中间锅炉 在氨基甲酸酯解离的操作条件下,将其作为惰性溶剂使用,并作为外部回流(4)以> 95%重量的液体形式供给,基于外加剂的总重量 (4),在富集部分(V)的上部区域和作为气体的过热流(5)在一个或多个点处进入汽提段(A)的下部区域。
    • 39. 发明申请
    • INTEGRATED METHOD FOR THE PREPARATION OF TRIOXANE FROM FORMALDEHYDE
    • 用于从甲醛制备三氧化二铁的综合方法
    • US20090187033A1
    • 2009-07-23
    • US12304223
    • 2007-06-11
    • Markus SiegertNeven LangEckhard StroeferChristophe Sigwart
    • Markus SiegertNeven LangEckhard StroeferChristophe Sigwart
    • C07D323/06
    • C07D323/06Y02P20/125
    • An integrated process for preparing trioxane from formaldehyde, comprising the steps of: a) feeding a feed stream A1 comprising formaldehyde and water and a recycle stream B3 comprising predominantly water and additionally formaldehyde and trioxane to a formaldehyde concentration unit and separating it into a formaldehyde-rich stream A2 and a stream A3 consisting essentially of water; b) feeding a product stream C1 comprising trioxane, water and formaldehyde, a recycle stream E1 comprising trioxane, water and formaldehyde, and, if appropriate, the stream A2 to a first low-pressure distillation column and distilling at a pressure of from 0.1 to 1.5 bar, and withdrawing a trioxane-enriched stream B comprising predominantly trioxane and additionally water and formaldehyde, a bottom draw stream B2 consisting essentially of formaldehyde and water, and the recycle stream B3 comprising predominantly water and additionally formaldehyde and trioxane as a side draw stream; c) feeding the bottom draw stream B2 and, if appropriate, the stream A2 to a trioxane synthesis reactor and allowing them to react to obtain the stream C1 comprising trioxane, water and formaldehyde; d) feeding the stream B1 to a medium-pressure distillation column and distilling at a pressure of from 1.0 to 3.0 bar to obtain a low boiler stream D1 comprising methanol, methylal and methyl formate, and a stream D2 comprising predominantly trioxane and additionally formaldehyde and water; e) feeding the stream D2 to a high-pressure distillation column and distilling at a pressure of from 2.5 to 10.0 bar to obtain the recycle stream E1 comprising trioxane, water and formaldehyde, and a product stream E2 consisting essentially of trioxane; the stream A2 being fed either to the low-pressure distillation column or to the trioxane synthesis reactor or to both.
    • 一种用于从甲醛制备三恶烷的综合方法,包括以下步骤:a)将包含甲醛和水的进料流A1和主要包含水,再加甲醛和三恶烷的再循环流B3进料至甲醛浓缩装置,并将其分离成甲醛 - 富流A2和基本上由水组成的流A3; b)将包含三恶烷,水和甲醛的产物流C1,包含三恶烷,水和甲醛的循环流E1,以及如果合适的话,将流A2加入到第一低压蒸馏塔中,并在0.1至0.1的压力下蒸馏 包括主要为三恶烷,另外为水和甲醛的三恶烷富集流B,主要由甲醛和水组成的底部牵引流B2,主要包含水和另外的甲醛和三恶烷作为侧馏分流的再循环流B3 ; c)将底部牵引流B2和(如果合适的话)将料流A2加入到三恶烷合成反应器中并使其反应以获得包含三恶烷,水和甲醛的料流C1; d)将料流B1加入到中压蒸馏塔中并在1.0-3.0巴的压力下蒸馏,得到包含甲醇,甲缩醛和甲酸甲酯的低沸点物流D1,以及主要包含三恶烷和另外甲醛的物流D2,以及 水; e)将料流D2加入到高压蒸馏塔中并在2.5至10.0巴的压力下蒸馏以获得包含三恶烷,水和甲醛的再循环流E1和基本上由三恶烷组成的产物流E2; 流A2被供给至低压蒸馏塔或三恶烷合成反应器或两者。
    • 40. 发明申请
    • Process for Producing Trioxane and at Least One Comonomer
    • 生产三恶烷和至少一种共聚单体的方法
    • US20080283384A1
    • 2008-11-20
    • US12091976
    • 2006-10-27
    • Neven LangRalf BoehlingAchim StammerJan OldenburgMarkus SiegertEckhard Stroefer
    • Neven LangRalf BoehlingAchim StammerJan OldenburgMarkus SiegertEckhard Stroefer
    • C08G2/10B01D3/34C07D317/12C07D323/06
    • C08G2/10C07D317/12C07D323/06C08G2/20Y02P20/127Y02P20/582
    • The invention relates to a process for preparing trioxane and at least one comonomer for preparing (co)polymers based on trioxane, in which, in a first step, formaldehyde the at least one comonomer reactant are reacted in aqueous solution to give trioxane and comonomer, to obtain a reaction mixture A1 comprising trioxane, comonomer, formaldehyde and water, with or without comonomer reactant. In a second step, the reaction mixture A1 is distilled in a first distillation stage at a first pressure to obtain a stream B1 enriched in trioxane and comonomer and a stream B2 comprising essentially water and formaldehyde, with or without comonomer reactant. In a third step, stream B1 is distilled in a second distillation stage at a pressure which is above the pressure of the first distillation stage to obtain a stream C1 comprising trioxane, comonomer and water and a product stream C2 consisting essentially of comonomer and trioxane.
    • 本发明涉及一种制备三恶烷和至少一种共聚单体的方法,该共聚单体用于制备基于三恶烷的(共)聚合物,其中在第一步中,甲醛将至少一种共聚单体反应物在水溶液中反应得到三恶烷和共聚单体, 得到含有或不含共聚单体反应物的三恶烷,共聚单体,甲醛和水的反应混合物A 1。 在第二步中,将反应混合物A 1在第一压力下在第一蒸馏阶段进行蒸馏,以获得富含三恶烷和共聚单体的物流B 1和基本上含有水和甲醛的物流B 2,具有或不含共聚单体反应物。 在第三步骤中,在第二蒸馏阶段,在高于第一蒸馏阶段的压力的压力下蒸馏出料流B 1,以获得包含三恶烷,共聚单体和水的料流C 1和基本上由共聚单体组成的产物流C 2 和三恶烷。