Preparation of glycerol tert-butyl ethers
    1.
    发明申请
    Preparation of glycerol tert-butyl ethers 审中-公开
    甘油叔丁基醚的制备

    公开(公告)号:US20090240086A1

    公开(公告)日:2009-09-24

    申请号:US12077252

    申请日:2008-03-18

    IPC分类号: C07C41/06

    摘要: A process for making glycerol di-tert-butyl ethers is disclosed. In one aspect of the invention, glycerol and isobutylene react in the presence of a β-zeolite having a silicon to aluminum ratio greater than 150. In another aspect, the etherification is performed in the presence of a β-zeolite and added tert-butyl alcohol. Each process selectively provides glycerol di-tert-butyl ethers while reducing the generation of isobutylene dimers and trimers. Utilizing both aspects of the inventive process simultaneously affords a diether product mixture containing less than 5 wt. % of isobutylene oligomers.

    摘要翻译: 公开了制备甘油二叔丁基醚的方法。 在本发明的一个方面,甘油和异丁烯在硅与铝的比例大于150的β-沸石的存在下反应。另一方面,醚化在β-沸石存在下进行,并加入叔丁基 醇。 每种方法选择性地提供甘油二叔丁基醚,同时减少异丁烯二聚体和三聚体的产生。 同时利用本发明方法的两个方面,提供含有少于5wt。 %的异丁烯低聚物。

    Process for making crosslinked polyvinylpyrrolidone with low swell volume
    2.
    发明授权
    Process for making crosslinked polyvinylpyrrolidone with low swell volume 失效
    具有低溶胀体积的交联聚乙烯吡咯烷酮的方法

    公开(公告)号:US06512066B1

    公开(公告)日:2003-01-28

    申请号:US10075327

    申请日:2002-02-14

    IPC分类号: C08F2608

    CPC分类号: C08F126/10

    摘要: A two-step, base-catalyzed process for making crosslinked polyvinylpyrrolidone (PVP-P) having a low swell volume is disclosed. A crosslinker is generated “in situ” in the first step by heating a basic aqueous mixture containing a relatively low concentration of N-vinylpyrrolidone under added inert gas pressure. In a second step, the reactor temperature is reduced to initiate polymerization. The process is a productive way to make PVP-P that is easy to isolate and purify. The polymer has a swell volume less than about 40 mL H2O/10 g polymer, which makes it valuable for beverage clarification.

    摘要翻译: 公开了一种用于制备具有低膨胀体积的交联聚乙烯吡咯烷酮(PVP-P)的两步碱催化方法。 通过在加入的惰性气体压力下加热含有较低浓度的N-乙烯基吡咯烷酮的碱性含水混合物,在第一步骤“原地”产生交联剂。 在第二步中,降低反应器温度以引发聚合。 该过程是使PVP-P易于分离和纯化的有效方式。 该聚合物具有小于约40mL H 2 O / 10g聚合物的溶胀体积,这使得它对于饮料澄清是有价值的。

    Process for making crosslinked polyvinylpyrrolidone
    3.
    发明授权
    Process for making crosslinked polyvinylpyrrolidone 失效
    制备交联聚乙烯吡咯烷酮的方法

    公开(公告)号:US06660800B1

    公开(公告)日:2003-12-09

    申请号:US10272729

    申请日:2002-10-17

    IPC分类号: C08L5500

    摘要: A process for making crosslinked polyvinylpyrrolidone (PVP-P) is disclosed. Crosslinker generation, followed by polymerization of NVP, gives a polymer containing up to 4 wt. % of residual NVP. An aqueous mixture of the polymer is then heated in the presence of a protic acid at pH

    摘要翻译: 公开了制备交联聚乙烯吡咯烷酮(PVP-P)的方法。 交联剂生成,随后是NVP的聚合,得到含有至多4wt。 剩余NVP的百分比。 然后在pH <4的质子酸存在下加热聚合物的水性混合物以消除NVP。 最后,用碱金属氢氧化物水溶液中和PVP-P。 该方法产生低毒性废水(<20 L / kg PVP-P)的体积减少,并产生符合重要产品规格的PVP-P。