公开(公告)号：KR100888065B1

公开(公告)日：2009-03-11

申请号：KR1020070116516

申请日：2007-11-15

申请人： 아신기술 주식회사

发明人： 이면기 ,  권덕준 ,  이동원

IPC分类号： C07B41/00 ,  C07C69/02 ,  C07C69/14

CPC分类号： C07C53/08 ,  C07B41/02 ,  C07B41/08 ,  C07C29/095 ,  C07C29/80 ,  C07C31/04 ,  C07C51/09 ,  C07C51/44 ,  C07C69/02

摘要： A hydrolysis method for methyl acetate is provided to raise the hydrolysis efficiency and to separate and collect the acetic acid aqueous solution and methanol of high purity by removing organic impurities contained in the methyl acetate generated from the process of producing an aromatic acid or polyvinyl alcohol. A hydrolysis method for methyl acetate comprises (a) a step of feeding a mixed solution consisting of methyl acetate(1) containing organic impurities selected from xylene, propyl acetate, benzene or their mixture, and water(2) to an extractor(21), injecting water or aromatic organic solvent in the extractor, separating organic impurities by inducing the phase separation of an aqueous phase and an organic phase, and recirculating the aqueous phase to a mixing tank; (b) a step of generating acetic acid and methanol through the hydrolysis of methyl acetate by feeding the mixed solution to a hydrolysis reactor filled with a solid acid catalyst, and feeding the reactant containing acetic acid and methanol to the upper part of the first evaporator(7); (c) a step of recirculating the un-reacted methyl acetate to the mixing tank, and feeding the mixed solution of acetic acid, methanol and water from the lower part to the second evaporator(13); and (d) a step of separating the acetic acid aqueous solution(15) and methanol(17) in the second evaporator, refluxing the condensed water by a condenser(19) of the upper part and recirculating the condensed water to the mixing tank.

摘要翻译： 提供乙酸甲酯的水解方法以提高水解效率，并且通过除去由生产芳族酸或聚乙烯醇的方法产生的乙酸甲酯中含有的有机杂质，分离和收集高纯度的乙酸水溶液和甲醇。 乙酸甲酯的水解方法包括（a）将含有选自二甲苯，乙酸丙酯，苯或其混合物中的有机杂质的乙酸甲酯（1）和水（2）的混合溶液进料到提取器（21）的步骤， 在萃取器中注入水或芳族有机溶剂，通过诱导水相和有机相的相分离，并将水相再循环到混合罐中来分离有机杂质; （b）通过将混合溶液加入填充有固体酸催化剂的水解反应器中，通过乙酸甲酯的水解产生乙酸和甲醇的步骤，并将含有乙酸和甲醇的反应物进料到第一蒸发器的上部 （7）; （c）将未反应的乙酸甲酯再循环到混合罐中，并将乙酸，甲醇和水的混合溶液从下部供给到第二蒸发器（13）的步骤; 和（d）在第二蒸发器中分离乙酸水溶液（15）和甲醇（17）的步骤，通过上部的冷凝器（19）回流冷凝水并将冷凝水再循环到混合罐。

公开(公告)号：KR1020100031765A

公开(公告)日：2010-03-24

申请号：KR1020107002752

申请日：2008-06-12

申请人： 에보니크 데구사 게엠베하

发明人： 코블러,크리스토프 ,  해틀레이,마틴 ,  로트,필립 ,  야거,바바라 ,  벡베커,크리스토프 ,  후트마허,클라우스

IPC分类号： C07C51/15 ,  C07C59/185 ,  C07C323/52

CPC分类号： C07C319/20 ,  C07B41/06 ,  C07B41/08 ,  C07C51/373 ,  C07C67/313 ,  C07C319/14 ,  C07C323/52 ,  C07D317/32 ,  C07D493/08 ,  C07C62/18 ,  C07C69/716 ,  C07C321/14

摘要： A method for the production of α-ketoacids, in particular of α-ketomethionine, and their derivatives is described, as also is the use of thiols for reversing the polarity of aliphatic or aromatic aldehydes. In this method, a) an aldehyde is reacted with thiols to give the corresponding dithioacetal, and b) the resultant dithioacetal then reacts with an electrophile in the presence of a base and after hydrolysis to give an α,α-(dithio)carboxylic acid and c) the α,α-(dithio)carboxylic acid is then reacted via acid-catalysed solvolysis to give the α-ketoacid or its derivatives, with liberation of thiol.

摘要翻译： 还描述了生产α-酮酸，特别是α-酮基甲硫氨酸及其衍生物的方法，也是使用硫醇逆转脂族或芳族醛的极性。 在该方法中，a）使醛与硫醇反应得到相应的二硫缩醛，b）所得的二硫缩醛随后在碱的存在下与亲电子试剂反应并在水解后得到α，α-（二硫代）羧酸 和c）然后通过酸催化溶剂解反应α，α-（二硫代）羧酸，得到α-酮酸或其衍生物，同时释放硫醇。