Method for preparing acrylamide polymers
    2.
    发明授权
    Method for preparing acrylamide polymers 失效
    制备丙烯酰胺聚合物的方法

    公开(公告)号:US4306048A

    公开(公告)日:1981-12-15

    申请号:US176031

    申请日:1980-08-07

    CPC分类号: C08F6/12

    摘要: In the production of a dried acrylamide polymer by polymerizing, in an aqueous medium, acrylamide alone or a monomer mixture comprising 50 mole % or more of acrylamide and at least one monomer copolymerizable therewith with a radical initiator, and then drying the resulting hydrous acrylamide polymer, the allowing of at least one of the following compounds [I], [II] and [III] to be present in the drying step or a step prior thereto enables the dried acrylamide polymer having a high molecular weight and a good dissolvability in water to be obtained:[I] a non-polymerizable compound having in its molecule at least one group represented by the formula, ##STR1## wherein R.sub.1 is H or an alkyl group having up to 4 carbon atoms, [II] a compound represented by the formula, R.sub.2 --S--C.sub.n H.sub.2n X wherein n is an integer of 1 to 8, R.sub.2 is an alkyl group, an aryl group or --C.sub.n H.sub.2n X, in which X is --OH, --COOH (or its salt), --CN or --CONH.sub.2, and[III] a compound represented by the formula, ##STR2## wherein R.sub.3, R.sub.4 and R.sub.5 are H, alkali metals or alkyl or aryl groups.

    摘要翻译: 在水性介质中单独使用丙烯酰胺或含有50摩尔%以上丙烯酰胺的单体混合物和至少一种可与其自由基引发剂共聚的单体的聚合反应生产干燥的丙烯酰胺聚合物,然后干燥得到的含水丙烯酰胺聚合物 ,允许至少一种以下化合物[I],[II]和[III]化合物存在于干燥步骤或之前的步骤中,使得干燥的丙烯酰胺聚合物具有高分子量和在水中的良好溶解性 [I]在其分子中具有至少一个由下式表示的基团的非聚合性化合物,其中R 1为H或具有至多4个碳原子的烷基,[II]表示的化合物 其中n为1〜8的整数,R 2为烷基,芳基或-C n H 2n,其中X为-OH,-COOH(或其盐),-CN或 - CONH 2和[III]由下式表示的化合物,其中R 3,R 4和R 3 5是H,碱金属或烷基或芳基。

    Process for purifying acrylamides
    4.
    发明授权
    Process for purifying acrylamides 失效
    丙烯酰胺纯化方法

    公开(公告)号:US3947518A

    公开(公告)日:1976-03-30

    申请号:US465303

    申请日:1974-04-29

    CPC分类号: C07C233/09 C07C233/16

    摘要: Process for purifying an acrylamide including the steps of (1) adding an inorganic base (excluding ammonia) to an aqueous solution containing 15 to 60% by weight of the acrylamide at a temperature of up to 60.degree.C in an amount of 0.1 to 1.5 wt. % based on the acrylamide and (2) blowing a gas, inert to the acrylamide, into the resulting mixture at a hydrogen ion concentration of a pH of 12 to 13.7 and if necessary, (3) subjecting the so treated acrylamide solution to an active carbon adsorption treatment.

    摘要翻译: 包括以下步骤的方法(1)将无机碱(不包括氨)加入到含有15至60重量%丙烯酰胺的水溶液中,温度为60℃至0.1至1.5 重量 %,(2)以12〜13.7的氢离子浓度向丙烯酰胺吹入对丙烯酰胺惰性的气体,如果需要,(3)将如此处理的丙烯酰胺溶液进行活化 碳吸附处理。

    Communication satellite facility and satellite communication system
    5.
    发明申请
    Communication satellite facility and satellite communication system 失效
    通信卫星设施和卫星通信系统

    公开(公告)号:US20050101247A1

    公开(公告)日:2005-05-12

    申请号:US10652032

    申请日:2003-09-02

    IPC分类号: H04B7/19 H04B7/15 H04B7/185

    CPC分类号: H04B7/18521 H04B7/18515

    摘要: The present invention aims to provide a communication satellite facility and a satellite communication system adapted to respond flexibly to development and change of communication technologies occurring on the ground even after satellites have been launched. This object is achieved, according to the invention, by a system comprising a first satellite having antenna function, a second satellite having modem function and a third satellite having server function all of which are launched into one and same slot of geosynchronous orbit and connected one to another by wideband intersatellite communication. A ground station connected to a ground network communicates with the first satellite.

    摘要翻译: 本发明旨在提供一种通信卫星设备和卫星通信系统,其适用于即使在卫星发射之后灵活地响应发生在地面上的通信技术的发展和变化。 根据本发明,通过包括具有天线功能的第一卫星,具有调制解调器功能的第二卫星和具有服务器功能的第三卫星的系统实现了该目的,所述系统都发射到地球同步轨道和连接的一个和相同的时隙中 通过宽带卫星间通信。 连接到地面网络的地面站与第一颗卫星通信。

    Method for producing acrylamide using a microorganism
    8.
    发明授权
    Method for producing acrylamide using a microorganism 失效
    使用微生物生产丙烯酰胺的方法

    公开(公告)号:US4851342A

    公开(公告)日:1989-07-25

    申请号:US692758

    申请日:1985-01-18

    IPC分类号: C12P13/02 C12R1/15 C12R1/365

    摘要: A method is described for producing acrylamide from acrylonitrile by the action of a microorganism having nitrilase activity in an aqueous medium, which comprises conducting the reaction in the presence of an alkali metal sulfate at an ionic activity of from 0.004 to 0.01 mole per liter while controlling the pH of said aqueous medium within a range of from 7 to 9 with an alkali hydroxide.

    摘要翻译: 描述了通过在水性介质中具有腈水解酶活性的微生物的作用从丙烯腈制备丙烯酰胺的方法,该方法包括在碱金属硫酸盐存在下以0.004至0.01摩尔/升的离子活性进行反应,同时控制 所述水性介质的pH在碱金属氢氧化物的范围内为7-9。