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公开(公告)号：US4830712A
公开(公告)日：1989-05-16
申请号：US102369
申请日：1987-09-29
申请人： John W. Crandall , Bernard C. Ream
发明人： John W. Crandall , Bernard C. Ream
IPC分类号： C07C27/00 , C07C29/149 , C07C29/80 , C07C31/20 , C07C67/00
CPC分类号： C07C29/80 , Y10S203/06 , Y10S203/20 , Y10S203/24
摘要： A process is described for recovering polyester-grade ethylene glycol from crude ethylene glycol containing at least one component which has a normal boiling point below that of ethylene glycol, and which can form a UV absorber in the presence of ethylene glycol which comprises supplying to an ethylene glycol distillation system, preferably comprising a fractional distillation zone having an upper portion, a lower portion and an intermediate portion a crude ethylene glycol stream at a determined pH of less than about 7.5; maintaining within the intermediate portion of the fractional distillation zone a diluent having a boiling point below that of the at least one component, such as methanol, at a concentration sufficient to reduce the formation of UV absorber in the intermediate portion wherein at least ethylene glycol, the at least one component and the diluent, are present, and withdrawing ethylene glycol substantially free of the at least one component from the lower portion of the fractional distillation zone.
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公开(公告)号：US4663477A
公开(公告)日：1987-05-05
申请号：US844895
申请日：1986-03-27
IPC分类号： C07C69/36 , C07C29/09 , C07C29/147 , C07C31/04 , C07C67/36 , C07C67/48 , C07C67/60 , C07C69/96
CPC分类号： C07C29/095
摘要： A process is provided for the utilization of dialkyl carbonates formed as by-products in a continuous process for the synthesis of oxalic acid esters from nitrous acid esters and carbon monoxide and wherein the esters are subsequently used as intermediates in the production of commercially useful products, such as ethylene glycol. The process comprises contacting a mixture containing the by-product comprised of a dialkyl carbonate with an aqueous solution of a metal carbonate under hydrolyzing conditions whereby the dialkyl carbonate is converted to the corresponding alkanol and the metal carbonate is converted to metal bicarbonate. Upon distillation of the alkanol from the mixture the bicarbonate is converted back to the metal carbonate which can then be recycled from the bottoms to the hydrolyzing zone for use in further hydrolysis of by-product. The alkanol is recycled for use in the continuous process.
摘要翻译： 提供了一种方法，用于利用在连续方法中形成副产物的二烷基碳酸酯，用于从亚硝酸酯和一氧化碳合成草酸酯，并且其中酯随后用作生产商业上有用的产品的中间体， 如乙二醇。 该方法包括在水解条件下使包含碳酸二烷基酯的副产物与金属碳酸盐水溶液的混合物接触，由此将碳酸二烷基酯转化为相应的链烷醇并将金属碳酸盐转化为金属碳酸氢盐。 在从混合物中蒸馏出链烷醇时，碳酸氢盐转化回到金属碳酸盐，然后可将其从塔底产物再循环到水解区，用于副产物的进一步水解。 链烷醇被再循环用于连续过程。
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公开(公告)号：US4670232A
公开(公告)日：1987-06-02
申请号：US458821
申请日：1983-01-18
申请人： John W. Crandall , Donald C. Best
发明人： John W. Crandall , Donald C. Best
CPC分类号： C01D3/16 , C01D3/14 , Y10S210/903
摘要： A method is disclosed for separating alkyleneamines from a mixture of by-product alkali or alkaline earth metal chloride salt and alkyleneamines comprising the sequenced combination of the steps of: (a) washing said amine-chloride salt mixture with an aqueous alkali or alkaline earth metal hydroxide solution to form a washed amine-chloride salt mixture; and (b) treating a mixture of the amino and chloride salt to physically separate chloride salt from said amine of said mixture.
摘要翻译： 公开了用于从副产物碱金属或碱土金属氯化物盐和亚烷基胺的混合物中分离亚烷基胺的方法，其包括以下步骤的有序组合：（a）用碱金属或碱土金属水溶液洗涤所述胺 - 氯化物盐混合物 氢氧化物溶液以形成洗涤的胺氯化物盐混合物; 和（b）处理氨基和氯化物盐的混合物以物理分离所述混合物的胺的氯化物盐。
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公开(公告)号：US4570019A
公开(公告)日：1986-02-11
申请号：US577323
申请日：1984-02-08
摘要： A process is provided which may be run continuously for producing polyethylene polyamines having improved color characteristics which comprises treating discolored polyethylene polyamines with polyethylene polyamine hydrochloride in the presence of water at elevated temperatures for the time necessary to reduce the color of said polyethylene polyamines and then flash evaporating the decolorized polyethylene polyamines from the treating mixture.
摘要翻译： 提供可以连续运行以生产具有改进的颜色特性的聚乙烯多胺的方法，该方法包括在高温下在水存在下用聚乙烯多胺盐酸盐处理变色聚乙烯多胺，所需时间降低所述聚乙烯多胺的颜色，然后闪蒸 从处理混合物中蒸发脱色的聚乙烯多胺。
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5.发明授权
公开(公告)号：US4166773A
公开(公告)日：1979-09-04
申请号：US863353
申请日：1977-12-22
IPC分类号： C07D317/36 , B01D1/00 , B01D1/06 , B01D3/14 , C07C45/00 , C07C45/50 , C07C45/82 , C07C67/00 , C07D317/38 , B01D3/28
CPC分类号： C07D317/38 , B01D1/065 , B01D3/148 , Y10S203/20 , Y10S203/90
摘要： This invention is concerned with a continuous process for separating higher boiling, heat sensitive components from a liquid product stream. It involves a rapid evaporation of the desired product of the stream in an evaporator which minimizes residence time, such as a falling film evaporator, and feeding the vapors and the remainder of the stream to a separation column where the vaporized products rise in the column. Part of the vaporized products are removed after condensation and then recycled back to the column as a reflux. This reflux after contacting one or more trays is collected and recycled to the evaporator and mixed with the product feed being treated. The liquid remainder of the feed stream is collected at the bottom of the column. The bottom of the column can be kept at a temperature which minimizes any breakdown of the heat sensitive components present therein and, if desired, the bottoms in the column can be quickly withdrawn for treatment elsewhere or for recycling back to the process. A desirable embodiment is to recycle a portion of the residue at the bottom of the column back to the evaporator.
摘要翻译： 本发明涉及从液体产物流中分离较高沸点的热敏组分的连续方法。 它涉及在蒸发器中快速蒸发所需产物，其使停留时间最小化，例如降膜蒸发器，并将蒸气和剩余物流送入蒸发产物在柱中升高的分离塔。 部分蒸发产物在冷凝后除去，然后作为回流再循环回塔。 收集一个或多个塔盘后的回流并循环到蒸发器中并与待处理的产品进料混合。 进料流的剩余液体在柱的底部收集。 柱的底部可以保持在最小化其中存在的热敏组分的任何破坏的温度，并且如果需要，可以快速地将塔中的塔底物撤回用于在别处处理或用于回收到该方法。 一个理想的实施例是将塔底部残留物的一部分再循环回蒸发器。
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