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1. 发明授权

US5436363A Method for making alkyl-.alpha.-cyanoacrylate from depolymerization of poly(alkyl-.alpha.-cyanoacrylate) 失效
标题翻译：聚（氰基-α-氰基丙烯酸烷基酯）解聚制备烷基-α-氰基丙烯酸酯的方法
公开(公告)号：US5436363A
公开(公告)日：1995-07-25
申请号：US315998
申请日：1994-10-03
申请人： Tien-Lu Wang , Tso-Chi Chiu , Kun-Chuo Chen
发明人： Tien-Lu Wang , Tso-Chi Chiu , Kun-Chuo Chen
IPC分类号： C07C253/30
CPC分类号： C07C253/30
摘要： A depolymerization and purification process, by which a poly(alkyl-.alpha.-cyanoacrylate) feed is depolymerized into high-purity cyanoacrylate monomers without the use of a high-boiling heat transfer medium such as tricresyl phosphate. The poly(alkyl-.alpha.-cyanoacrylate) feed, which contains one or more polymerization inhibitors such as hydroquinone and phosphorus pentoxide, is first introduced into a thin-film evaporator for a depolymerization reaction. The temperature of the film evaporator is maintained at about 200.degree..about.260.degree. C., and operated under a vacuum of 1.about.20 mm Hg. The produced gas stream from the depolymerization reactor is subject to a two-stage heat transfer process for condensation and purification. The first stage involves a very-high temperature condenser (about 150.degree. C.). The residue collected in the first stage condenser contains primarily dimers of .alpha.-cyanoacrylate. The second stage involves a conventional condenser at room temperature or lower temperature. The gaseous stream leaving the intermediate very-high temperature condenser contains primarily the desired cyanoacrylate monomer, thus it can be conveniently condensed in a conventional condenser, and the product is a very high purity cyanoacrylate product. This process eliminates the need of using a high-boiling heat transfer medium, thus eliminating the production of liquid waste, while allowing high-yield and high-purity final product of cyanoacrylate monomers to be produced in a continuous manner.
摘要翻译：将聚（烷基-α-氰基丙烯酸酯）进料解聚成高纯度氰基丙烯酸酯单体的解聚和纯化方法，而不使用高沸点传热介质如磷酸三甲苯酯。首先将含有一种或多种聚合抑制剂如氢醌和五氧化二磷的聚（烷基-α-氰基丙烯酸酯）进料引入用于解聚反应的薄膜蒸发器中。薄膜蒸发器的温度保持在约200℃-260℃，并在1分差20mmHg的真空下操作。来自解聚反应器的产生的气流经历两阶段的冷凝和净化传热过程。第一阶段涉及非常高温的冷凝器（约150℃）。在第一阶段冷凝器中收集的残余物主要包含α-氰基丙烯酸酯的二聚体。第二阶段涉及室温或较低温度下的常规冷凝器。离开中间极高温冷凝器的气流主要包含所需的氰基丙烯酸酯单体，因此可以方便地在常规冷凝器中冷凝，产物是非常高纯度的氰基丙烯酸酯产物。该方法消除了使用高沸点传热介质的需要，从而消除了液体废物的产生，同时允许以连续的方式生产氰基丙烯酸酯单体的高产率和高纯度的最终产物。

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