知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

172 records (took 0.021 seconds)

    Process for preparing silver salt solutions
    121.
    发明授权
    Process for preparing silver salt solutions 失效
    制备银盐溶液的方法

    公开(公告)号：US5342973A

    公开(公告)日：1994-08-30

    申请号：US700894

    申请日：1991-05-13

    Applicant: Mitchell Becker ,  Kindtoken H. Liu

    Inventor： Mitchell Becker ,  Kindtoken H. Liu

    IPC: B01J23/50 ,  B01J23/66 ,  C07B61/00 ,  C07D301/10

    CPC classification number: B01J23/50 ,  C07D301/10 ,  Y02P20/52 ,  Y10S502/512

    Abstract: A silver salt solution suitable for depositing silver on a support in the preparation of silver catalysts is made by reacting a silver compound with a neo-acid, in a hydrocarbon solvent. The reaction is completed under reflux conditions, thereby removing water formed by the reaction and reacting at least 90% of the unreacted acid. Therefore, the solution may be used without further processing to impregnate a porous support, thereby providing a catalyst useful for oxidation of ethylene oxide.

    Abstract translation: 通过在烃溶剂中使银化合物与新酸反应，制备适用于在银催化剂制备中在载体上沉积银的银盐溶液。 反应在回流条件下完成，从而除去由反应形成的水并使至少90％的未反应的酸反应。 因此，可以不经进一步处理而使溶液浸渍多孔载体，从而提供可用于氧化环氧乙烷的催化剂。

    Catalyst for oxidation of ethylene to ethylene oxide
    125.
    发明授权
    Catalyst for oxidation of ethylene to ethylene oxide 失效
    将乙烯氧化成环氧乙烷的催化剂

    公开(公告)号：US5008413A

    公开(公告)日：1991-04-16

    申请号：US424932

    申请日：1989-10-23

    Applicant: Kintoken H. Liu

    Inventor： Kintoken H. Liu

    IPC: B01J23/68 ,  C07D301/10

    CPC classification number: C07D301/10 ,  B01J23/68

    Abstract: An improved silver catalyst for the oxidation of ethylene with molecular oxygen is made by impregnating a support with a silver salt prepared by reacting a silver compound with a neo-acid, in a hydrocarbon solvent with the reaction completed under reflux conditions; drying and activating the resultant precatalyst by heating in air; thereafter impregnating the activated catalyst with an amount, 800 to 5000 wppm of alkali metal, preferably Cs, to deactivate the catalyst to form a catalyst precursor and heating the catalyst precursor at 450.degree.-700.degree. C. for 0.1 to 4.5 hours at a steady state in a substantially inert atmosphere to reactivate it.

    Abstract translation: 用分子氧氧化乙烯的改进的银催化剂是通过在烃溶剂中使银化合物与新酸反应制备的银盐浸渍载体，反应在回流条件下完成的; 通过在空气中加热干燥并活化所得的预催化剂; 然后将活化的催化剂以800-5000wppm的碱金属优选Cs浸渍，以使催化剂失活以形成催化剂前体，并在稳定的温度下在450-700℃加热催化剂前体0.1至4.5小时 在基本惰性的气氛中进行再活化。

    Selective extraction of argon from ethylene oxide recycle stream
    126.
    发明授权
    Selective extraction of argon from ethylene oxide recycle stream 失效
    从环氧乙烷循环流中选择性提取氩气

    公开(公告)号：US4904807A

    公开(公告)日：1990-02-27

    申请号：US22496

    申请日：1987-03-06

    Applicant: Brian J. Ozero

    Inventor： Brian J. Ozero

    IPC: B01J23/66 ,  C07B61/00 ,  C07D301/10 ,  C07D301/32 ,  C07D303/04

    CPC classification number: C07D301/10 ,  C07D301/32 ,  Y02P20/52

    Abstract: The invention relates to an improved process for production of ethylene oxide which minimizes unreacted ethylene losses through the use of semi-permeable membrane units, thereby allowing an effective, selective removal of argon from the process cycle gas, without significant ethylene losses.

    Abstract translation: 本发明涉及用于生产环氧乙烷的改进方法，其通过使用半透膜单元使未反应的乙烯损失最小化，从而允许有效地选择性地从工艺循环气体中除去氩，而没有显着的乙烯损失。

    Process for preparing alkylene oxides from alkylene carbonates
    127.
    发明授权
    Process for preparing alkylene oxides from alkylene carbonates 失效
    从碳酸亚烷基酯制备环氧烷烃的方法

    公开(公告)号：US4851555A

    公开(公告)日：1989-07-25

    申请号：US664728

    申请日：1984-10-25

    Applicant: Robert M. Weinstein

    Inventor： Robert M. Weinstein

    IPC: C07D301/02 ,  C07D303/04

    CPC classification number: C07D301/02

    Abstract: An alkylene oxide, e.g. ethylene oxide, is prepared from the corresponding alkylene carbonate, e.g. ethylene carbonate, in the presence of an effective amount of a quaternary arsonium halide. The quaternary arsonium halides are also effective catalysts for the reverse reaction, that is, to form alkylene carbonates from the corresponding epoxide and carbon dioxide.

    Abstract translation: 环氧烷，例如 环氧乙烷由相应的碳酸亚烃酯制备，例如 在有效量的四卤化钌的存在下进行。 四卤化钌也是用于反向反应的有效催化剂，即从相应的环氧化物和二氧化碳形成碳酸亚烷基酯。

    Preparation of alkylene carbonates
    128.
    发明授权
    Preparation of alkylene carbonates 失效
    碳酸亚烷基酯的制备

    公开(公告)号：US4841072A

    公开(公告)日：1989-06-20

    申请号：US502024

    申请日：1983-06-07

    Applicant: Robert J. Harvey

    Inventor： Robert J. Harvey

    IPC: C07D319/06 ,  C07D321/00

    CPC classification number: C07D319/06 ,  C07D321/00

    Abstract: Alkylene carbonates, particularly ethylene carbonate, are prepared by the reaction of an alkylene oxide with carbon dioxide in the presence of a catalyst at temperatures in the region of the critical temperature of carbon dioxide, preferably 25.degree.-70.degree. C. and at autogenerated pressures, typically 30 to 200 kg/cm.sup.2 gauge. The conversion of alkylene oxide to alkylene carbonate can be carried out in the presence of water while minimizing the undesirable hydrolysis of the carbonate to the corresponding alkylene glycol. With certain catalysts the presence of water improves the selectivity to the formation of the carbonate.

    Abstract translation: 亚烷基碳酸酯，特别是碳酸亚乙酯，通过烯化氧与二氧化碳在催化剂存在下，在二氧化碳的临界温度，优选25〜70℃的温度和自动发生的压力下， 通常为30至200kg / cm2表压。 烯化氧转化为碳酸亚烷基酯可以在水存在下进行，同时最小化碳酸酯对相应亚烷基二醇的不期望的水解。 对于某些催化剂，水的存在改善了碳酸盐形成的选择性。

    Process for oxidation of ethylene to ethylene oxide
    129.
    发明授权
    Process for oxidation of ethylene to ethylene oxide 失效
    乙烯氧化成环氧乙烷的方法

    公开(公告)号：US4837347A

    公开(公告)日：1989-06-06

    申请号：US215618

    申请日：1988-07-06

    Applicant: Jay A. Rashkin

    Inventor： Jay A. Rashkin

    IPC: B01J23/66 ,  C07D301/10

    CPC classification number: B01J23/66 ,  C07D301/10

    Abstract: A supported silver catalyst selective to the formation of ethylene oxide in the reaction of ethylene with molecular oxygen is made by depositing an amount of an alkali metal sufficient to depress the activity and selectivity of the silver catalyst below that of its alkali-free state and thereafter heating the alkali metal-containing catalyst in a substantially oxygen-free atmosphere to reactivate it. In one embodiment, a large amount of alkali metal is deposited which removes substantially all activity from the silver catalyst and then activity and selectivity for oxidation of ethylene to ethylene oxide is recovered and enhanced by heating the catalyst in a nitrogen atmosphere to a temperature above 400.degree. C. for a sufficient period of time.

    Abstract translation: 通过沉积一定量的足以将银催化剂的活性和选择性降低到其无碱状态的活性和选择性的碱金属，然后在乙烯与分子氧的反应中选择性地形成环氧乙烷的负载型银催化剂 在基本上无氧的气氛中加热含碱金属的催化剂以使其重新活化。 在一个实施方案中，沉积大量的碱金属，其从银催化剂中除去基本上所有的活性，然后通过在氮气气氛中将催化剂加热到高于400℃的温度来回收和增强乙烯氧化成环氧乙烷的活性和选择性 DEG C.充足的时间。

    Optimizing the yield of maleic anhydride catalyst
    130.
    发明授权
    Optimizing the yield of maleic anhydride catalyst 失效
    优化马来酸酐催化剂的产率

    公开(公告)号：US4795818A

    公开(公告)日：1989-01-03

    申请号：US183372

    申请日：1988-04-11

    Applicant: Mitchell Becker ,  John Walden

    Inventor： Mitchell Becker ,  John Walden

    IPC: C07D307/60 ,  B01J27/00 ,  B01J27/198 ,  B01J31/00 ,  C07B61/00 ,  C07C51/215 ,  C07C57/145

    CPC classification number: C07C51/215 ,  B01J23/002 ,  B01J27/198 ,  B01J2523/00

    Abstract: A method of optimizing the yield of a vanadium-phosphorus catalyst during the oxidation of butane to maleic anhydride, which comprises establishing the temperature at which the catalyst provides the desired percentage conversion and yield of maleic anhydride with the established feed composition and then maintaining that temperature by continuously introducing an amount of a suitable phosphorus compound necessary to prevent a decline in selectivity to maleic anhydride without significantly increasing the temperature.

    Abstract translation: 在将丁烷氧化成马来酸酐期间优化钒磷催化剂的产率的方法，其包括确定催化剂提供所需百分比转化率的温度和马来酸酐与所确定的进料组成的产率，然后保持该温度 通过连续引入一定量的合适的磷化合物，以防止马来酸酐的选择性下降而不显着升高温度。

Patent Agency Ranking