Production of acrylamide using immobilized cells
    2.
    发明授权
    Production of acrylamide using immobilized cells 失效
    使用固定化细胞生产丙烯酰胺

    公开(公告)号:US4421855A

    公开(公告)日:1983-12-20

    申请号:US292848

    申请日:1981-08-14

    CPC分类号: C12N11/04 C12P13/02

    摘要: A process is described for producing acrylamide from acrylonitrile using an immobilized microorganism containing gel, which comprises immobilizing a microorganism having nitrilasic activity with a cationic acrylamide-based polymer gel and bringing acrylonitrile into contact with the immobilized microorganism gel in an aqueous medium containing substantially no salt.

    摘要翻译: 描述了一种用于使用固定化的含有微生物的凝胶从丙烯腈制备丙烯酰胺的方法,该方法包括用阳离子丙烯酰胺类聚合物凝胶固定具有亚硝酸活性的微生物,并使丙烯腈与基本上不含盐的水性介质中的固定化微生物凝胶接触 。

    Method for producing acrylamide using a microorganism
    3.
    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。

    Process for producing partially hydrolyzed polyacrylamide in the
presence of alkali metal hydroxide and boric acid
    4.
    发明授权
    Process for producing partially hydrolyzed polyacrylamide in the presence of alkali metal hydroxide and boric acid 失效
    在碱金属氢氧化物和硼酸存在下制备部分水解的聚丙烯酰胺的方法

    公开(公告)号:US3968093A

    公开(公告)日:1976-07-06

    申请号:US469443

    申请日:1974-05-13

    CPC分类号: C08F120/56

    摘要: A process for producing a partially hydrolyzed polyacrylamide which has a high molecular weight and high water solubility and can be suitably used as a flocculant for water treatment and a size for paper manufacture comprising polymerizing an aqueous solution of an acrylamide monomer in the presence of an alkali metal hydroxide such as sodium hydroxide and boric acid, whereby a partial hydrolysis of the polymer formed is also conducted substantially simultaneously with the polymerization. In an additional embodiment, a maturing of the polyacrylamide produced can be conducted by continuing to heat the polymer solution to increase the hydrolysis percentage.

    摘要翻译: 一种生产部分水解的聚丙烯酰胺的方法,其具有高分子量和高水溶性,并且可以适合用作水处理的絮凝剂和纸制造的尺寸,包括在碱的存在下聚合丙烯酰胺单体的水溶液 金属氢氧化物如氢氧化钠和硼酸,由此在聚合过程中基本上同时进行形成的聚合物的部分水解。 在另外的实施方案中,所生产的聚丙烯酰胺的成熟可以通过继续加热聚合物溶液以提高水解百分比来进行。

    Movable dome-type roof for structure
    5.
    发明授权
    Movable dome-type roof for structure 失效
    可移动圆顶型屋顶结构

    公开(公告)号:US5189851A

    公开(公告)日:1993-03-02

    申请号:US759744

    申请日:1991-09-12

    IPC分类号: E04B7/10 E04B7/16 E04H3/16

    CPC分类号: E04H3/165 E04B7/102 E04B7/163

    摘要: A structure having a movable dome-type roof including a plurality of independently movable shell sections which nest one beneath the other. A frame superstructure is arched over the dome to support the upper ends of the shell sections. The lower edges of the shell sections are mounted on self-powered carriages and are independently shiftable about a circular base of the structure. By selectively shifting individual shell sections, the dome may be contracted or expanded as desired. The superstructure may be mounted on a circular track or on a pair of linear tracks to expedite the opening and closing of the dome.

    摘要翻译: 一种具有可移动圆顶型屋顶的结构,其包括多个可独立移动的外壳部分,这些外壳部分嵌套在另一个之下。 框架上部结构在圆顶上拱形以支撑壳体部分的上端。 壳体部分的下边缘安装在自动动力滑架上,并且可以围绕结构的圆形基座独立地移动。 通过选择性地移动单个壳体部分,可以根据需要缩小或扩大圆顶。 上部结构可以安装在圆形轨道上或一对线性轨道上,以加速穹顶的打开和关闭。

    Method for preparing acrylamide polymers
    8.
    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
    10.
    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。