Method for the single-step production of polytetrahydrofuran and tetrahydrofuran copolymers
    25.
    发明授权
    Method for the single-step production of polytetrahydrofuran and tetrahydrofuran copolymers 失效
    单步生产聚四氢呋喃和四氢呋喃共聚物的方法

    公开(公告)号:US06716937B2

    公开(公告)日:2004-04-06

    申请号:US10312851

    申请日:2003-01-02

    CPC classification number: C08G65/30 C08G65/20

    Abstract: A process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over a heterogeneous acid catalyst in the presence of at least one telogen and/or comonomer selected from the group consisting of alpha,omega-diols, water, polytetrahydrofuran having a molecular weight of from 200 to 700 dalton and cyclic ethers comprises a) separating off the catalyst and/or downstream products of the catalyst suspended and/or dissolved in the output from the polymerization, b) fractionating the resulting catalyst-free output from the polymerization in at least one distillation step to give a distillation residue comprising the polymerization product and at least one tetrahydrofuran fraction and returning at least part of the tetrahydrofuran fraction to the polymerization and c) separating low molecular weight polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 200 to 700 dalton from the distillation residue from work-up step b) and isolating polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton.

    Abstract translation: 一种通过在多相酸催化剂的存在下,在四氢呋喃和/或共聚单体的存在下,通过四氢呋喃聚合,单分级制备平均分子量为650-5000道尔顿的聚四氢呋喃和/或四氢呋喃共聚物的方法,该共聚单体选自 由α,ω-二醇,水,分子量为200至700道尔顿的聚四氢呋喃和环醚组成的组包括:a)将催化剂和/或催化剂的下游产物分离出悬浮和/或溶解在聚合物的输出中 b)在至少一个蒸馏步骤中将所得无催化剂的产物从聚合中分馏,得到包含聚合产物和至少一种四氢呋喃馏分的蒸馏残余物,并将至少部分四氢呋喃馏分返回到聚合反应中, 分子量的四氢呋喃和/或四氢呋喃共聚物 来自后处理步骤b)的蒸馏残余物的200至700道尔顿的颗粒重量,并分离平均分子量为650-5000道尔顿的聚四氢呋喃和/或四氢呋喃共聚物。

    Method for the production of caprolactam
    27.
    发明授权
    Method for the production of caprolactam 有权
    生产己内酰胺的方法

    公开(公告)号:US06683180B2

    公开(公告)日:2004-01-27

    申请号:US10297209

    申请日:2002-12-04

    CPC classification number: C07D201/08 Y02P20/52

    Abstract: A process is provided for the preparation of caprolactam from a compound of formula (I): NC—(CH2)5—CO—R  (I) in which R is a carboxamide, carboxylic acid or carboxylic acid ester group, wherein a) a compound (I) or a mixture of such compounds, in the presence of ammonia and optionally a liquid diluent (VI), is hydrogenated with hydrogen in the presence of a catalyst (II) to give a mixture (III), b) the hydrogen and the catalyst (II) are separated from the mixture (III) to give a mixture (IV), and c) the mixture (IV), optionally in the presence of a liquid diluent (VII), is converted to caprolactam in the presence of a catalyst (V).

    Abstract translation: 提供了从式(I)化合物制备己内酰胺的方法:其中R是羧酰胺,羧酸或羧酸酯基,其中a)化合物(I)或这些化合物的混合物,在存在下 的氨和任选的液体稀释剂(VI)在催化剂(II)的存在下用氢氢化,得到混合物(III),b)将氢气和催化剂(II)从混合物(III)中分离出来, 任选在液体稀释剂(VII)的存在下,将混合物(IV)和(c)混合物(IV)在催化剂(V)的存在下转化成己内酰胺。

    Preparation of amines and aminonitriles
    28.
    发明授权
    Preparation of amines and aminonitriles 失效
    共同生产6-氨基己腈和6-六亚甲基二胺的方法

    公开(公告)号:US5827938A

    公开(公告)日:1998-10-27

    申请号:US635684

    申请日:1996-04-22

    CPC classification number: C07C209/48 C07C253/30 Y02P20/584

    Abstract: A process for the coproduction of 6-aminocapronitrile (ACN) and hexamethylenediamine (HMD) by treatment of adiponitrile (ADN) with hydrogen in the presence of a nickel-containing catalyst at temperatures not below room temperature and elevated hydrogen partial pressure in the presence or absence of a solvent comprises, after the conversion based on ADN and/or the selectivity based on ACN has or have dropped below a defined value (a) interrupting the treatment of ADN with hydrogen by stopping the feed of ADN and of the solvent, if used, (b) treating the catalyst at from 150.degree. to 400.degree. C. with hydrogen using a hydrogen pressure within the range from 0.1 to 30 MPa and a treatment time within the range from 2 to 48 h, and (c) then continuing the hydrogenation of ADN with the treated catalyst of stage (b).

    Abstract translation: 在含镍催化剂存在下,在不低于室温的温度和氢分压升高的情况下,通过用氢气处理己二腈(ADN),共同生产6-氨基己腈(ACN)和六亚甲基二胺(HMD)的方法, 没有溶剂包括在基于ADN的转化和/或基于ACN的选择性之后,或者已经降低到低于定义的值(a)通过停止ADN和溶剂的进料而中止用氢处理ADN,如果 使用,(b)使用氢气压力为0.1〜30MPa,处理时间为2〜48小时,用氢气在150〜400℃下处理催化剂,(c)然后继续 用(b)阶段处理的催化剂氢化ADN。

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