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    • 4. 发明授权
    • Column system process for polyester plants
    • 聚酯工厂的柱系统工艺
    • US4254246A
    • 1981-03-03
    • US23831
    • 1979-03-26
    • Ovidiu DicoiHans Wewer
    • Ovidiu DicoiHans Wewer
    • C07C29/80C07C69/82
    • C07C29/80Y10S203/06
    • A new process for use with continuously operated plants for the production of polyester polymers suitable for producing fibers, bottles and film, by reacting ethylene glycol and terephthalic acid in the presence of a catalyst so that the vapour by-products from the esterification, prepolycondensation and polycondensation stages are continuously rectified in two in-line columns yielding ethylene glycol of high purity (99.85%) which is returned to the process, waste water with 400 ppm ethylene glycol, and a heavy fraction containing oligomers, diethylene glycol, etc.Moreover, an improvement in the quality of the esterified product is attained as it contains less than 0.6% diethylene glycol without the use of diisopropylamine, a poisonous additive.
    • 一种用于生产适用于生产纤维,瓶和薄膜的聚酯聚合物的连续操作设备的新方法,通过使乙二醇和对苯二甲酸在催化剂存在下反应,使得来自酯化,预缩聚的蒸气副产物和 缩聚阶段在两个直列柱中连续精馏,得到高纯度(99.85%)的乙二醇,并返回该方法,含有400ppm乙二醇的废水和含低聚物,二甘醇等的重馏分。此外, 得到酯化产物质量的改善,因为它含有少于0.6%的二甘醇,而不使用二异丙胺(一种有毒添加剂)。
    • 5. 发明授权
    • Continuous process for the recovery of caprolactam
    • 持续的己内酰胺回收方法
    • US4107160A
    • 1978-08-15
    • US827370
    • 1977-08-24
    • Ovidiu DicoiErwin Doerr
    • Ovidiu DicoiErwin Doerr
    • C07D201/12C07D201/16
    • C07D201/16C07D201/12
    • A process for the continuous recovery of caprolactam from either solid polycaprolactam waste by depolymerization or from liquid polycaprolactam extraction water from an extraction zone where, in either instance, a caprolactam water vapor mixture is produced and subsequently upgraded in a distillation zone to provide a dilute mixture of caprolactam and water vapor. A minor portion of this dilute caprolactam water vapor is condensed and recycled to the distillation zone. The remaining, major portion of this mixture is compressed and admixed with fresh steam, superheated and passed to either the extraction zone or depolymerization reaction.
    • 从固体聚己内酰胺废物通过解聚连续回收己内酰胺或从液体聚己内酰胺萃取水中从萃取区连续回收己内酰胺的方法,其中在任何一种情况下产生己内酰胺水蒸气混合物,随后在蒸馏区中升级以提供稀释混合物 的己内酰胺和水蒸汽。 该稀少己内酰胺水蒸气的一小部分被冷凝并再循环到蒸馏区。 将该混合物的剩余部分压缩并与新鲜蒸汽混合,过热并通过萃取区或解聚反应。