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    Process for the continuous separation of crystallizable substances
    121.
    发明授权
    Process for the continuous separation of crystallizable substances 失效
    连续分离可结晶物质的方法

    公开(公告)号：US3375082A

    公开(公告)日：1968-03-26

    申请号：US45155965

    申请日：1965-04-28

    Applicant: HOECHST AG

    Inventor： GRAF RODERICH

    IPC: B01D9/00 ,  B01D9/02 ,  C07C51/43 ,  C07D201/16 ,  C07D205/08 ,  C30B13/32

    CPC classification number: C07D205/08 ,  B01D9/0013 ,  B01D9/004 ,  B01D9/0063 ,  C07C51/43 ,  C07C317/00 ,  C07D201/16 ,  C07C57/08

    Abstract: 1,100,426. Crystal - melt reflux. FARBWERKE HOECHST A.G. 29 April, 1965 [29 April, 1964], No. 18090/65. Heading B1G. [Also in Division F4] A high-melting component is separated in pure form from a mixture by passing the mixture into an intermediate zone of a vertical fractionation column which is cooled at the top and heated at the bottom. Crystals of the high - melting component fall downwards through the column and are melted at the bottom, a portion of the melt rises so effecting reflux, and the remainder of the melt is withdrawn as product. Component-depleted solvent is withdrawn from the top of the column. The amount of solvent employed may be 10 times that of the impurity to be removed. Substances purified may be 4,4-dimethyl-acetidnone-2 (from diisopropyl ether), dimethyl sulphoxide (from isopropyl chloride), and crotonic acid (from diisopropyl ether). According to the Figure, solution passes from a pipe 4 into a column 1 between cooling jackets 2 and 3, solvent passes out through a pipe 8, crystals are melted by heating jacket 13, and melt passes out through a pipe 6. The solution is stirred by a perforated blade 9 which may rotate in alternate directions. The temperature in the column is measured at points T 1-3 .

    COMPOSITIONS AND METHODS FOR REMOVAL OF N-METHYL-2-PYRROLIDONE (NMP) DEGRADATION PRODUCTS AND OTHER FOULANTS FROM NMP PURIFICATION SYSTEMS
    127.
    发明公开
    COMPOSITIONS AND METHODS FOR REMOVAL OF N-METHYL-2-PYRROLIDONE (NMP) DEGRADATION PRODUCTS AND OTHER FOULANTS FROM NMP PURIFICATION SYSTEMS 审中-公开

    公开(公告)号：US20240132446A1

    公开(公告)日：2024-04-25

    申请号：US18562589

    申请日：2022-05-24

    Applicant: Refined Technologies, Inc.

    Inventor： Jerrod Overholt ,  Sean E. Sears

    IPC: C07D201/16

    CPC classification number: C07D201/16

    Abstract: Methods of cleaning an N-methyl-2-pyrrolidone (NMP) purification and recovery system having an NMP-containing chemical waste stream, a separation tower fluidically coupled with the chemical waste stream, a reflux drum fluidically coupled with an upper section of the separation tower, a reboiler fluidically coupled with a lower section of the separation tower, and a purified NMP stream fluidically coupled with the reboiler. The methods include injecting a cleaning solution into the reflux drum and the reboiler with an amount of the cleaning solution sufficient to at least substantially fill the reflux drum and the reboiler, the cleaning solution comprising a solvent having a primary amine and a hydroxyl group, circulating the cleaning solution through at least the separation tower, the reflux drum, the reboiler for a period of time to solubilize foulants contained within the system, and draining the cleaning solution having foulants solubilized therein from the system.

    PURIFICATION METHOD FOR LAUROLACTAM
    128.
    发明公开
    PURIFICATION METHOD FOR LAUROLACTAM 审中-公开

    公开(公告)号：US20240076450A1

    公开(公告)日：2024-03-07

    申请号：US18262214

    申请日：2022-01-20

    Applicant: HANWHA SOLUTIONS CORPORATION

    Inventor： Jeongseok PARK ,  Jinho PARK ,  Namjin JANG

    IPC: C08G69/18 ,  C07D201/16 ,  C07D225/02

    CPC classification number: C08G69/18 ,  C07D201/16 ,  C07D225/02

    Abstract: The present invention relates to a purification method for laurolactam, and more particularly, to a purification method capable of obtaining high-purity laurolactam substantially free of impurities.
    The present invention provides a purification method for laurolactam from a reaction product of a laurolactam synthesis process, the production method including: (S1) obtaining a first mixed solid by separating and removing low-boiling point materials through distillation of the reaction product; (S2) removing impurities suspended in a first mixed solution obtained by dissolving the first mixed solid in a good solvent; (S3) obtaining a second mixed solid precipitated by adding a poor solvent to the first mixed solution from which the impurities are removed; and (S4) evaporating a melt obtained by heating and melting the second mixed solid to obtain laurolactam in a gas phase and performing crystallization.

    Process for the recovery of ε-caprolactam from extract water
    130.
    发明授权
    Process for the recovery of ε-caprolactam from extract water 有权
    从萃取水中回收ε-己内酰胺的方法

    公开(公告)号：US09562008B2

    公开(公告)日：2017-02-07

    申请号：US14917808

    申请日：2014-07-07

    Applicant: Technip Zimmer GmbH

    Inventor： Andreas Bormann ,  Manfred Albrecht ,  Franz Samlitschka

    IPC: C07D201/16

    CPC classification number: C07D201/16

    Abstract: A process for the recovery of ε-caprolactam from extract water of polycaprolactam obtained by hydrolytic polymerization, wherein the extract water is concentrated, subsequently contained oligomers are depolymerized, non-depolymerizable impurities are separated, water and low-boiling impurities are removed, wherein for adjusting the purity of the recovered ε-caprolactam and the energy consumption used for the process a part of the product is removed from the process as intermediate products.

    Abstract translation: 从通过水解聚合获得的聚己内酰胺的萃取水中回收ε-己内酰胺的方法，其中提取水浓缩，随后包含的低聚物被解聚，不可解聚的杂质被分离，除去水和低沸点杂质，其中对于 调整回收的ε-己内酰胺的纯度和用于该方法的一部分产品所用的能量消耗作为中间产物。

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