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23 条记录 (耗时 0.008 秒)

    RECYCLING OF WAFER CLEANING SUBSTANCES
    3.
    发明授权
    RECYCLING OF WAFER CLEANING SUBSTANCES 失效
    CLEAN半导体材料的回收二手轮胎

    公开(公告)号：EP0739228B1

    公开(公告)日：2002-05-29

    申请号：EP95903515.5

    申请日：1994-11-14

    申请人： FSI International

    发明人： GRANT, Donald, C.

    IPC分类号： B01D3/34 ,  C01B17/90

    CPC分类号： C01B7/0712 ,  B01D3/343 ,  C01B7/093 ,  C01B7/196 ,  C01B21/46 ,  Y10S159/19

    摘要： A method of recycling and purifying cleaning chemicals used in the production of semiconductor circuits and containing hydrofluoric acid and/or hydrochloric acid. Recycling of such chemicals is accomplished using separation and reconstitution steps. Hydrofluoric acid and hydrochloric acid cannot be distilled directly from a chemical solution as they form azeotropes with water. A low vapor pressure substance such as sulfuric acid or phosphoric acid is used to break the azeotrope while increasing the purity of the recovered chemicals and decreasing disposal problems. The method is useable at the point of use of the chemicals.

    Method for separating boric acid
    5.
    发明公开
    Method for separating boric acid 失效
    Verfahren zum Trennen vonBorsäure。

    公开(公告)号：EP0630029A1

    公开(公告)日：1994-12-21

    申请号：EP94201610.6

    申请日：1994-06-07

    申请人： "STUDIECENTRUM VOOR KERNENERGIE", instelling van openbaar nut.

    发明人： Bruggeman, Aimé ,  Braet, Johan

    IPC分类号： G21F9/08 ,  G21F9/06

    CPC分类号： G21F9/08 ,  G21F9/06 ,  Y10S159/12 ,  Y10S159/19

    摘要： Method for separating boric acid from a boric acid containing liquid, especially from liquid waste of a nuclear power plant, characterised in that the boric acid containing liquid is continuously fed in a reactor (1 or 10) with a non-alkaline environment, and that the boric acid is removed by being evaporated by means of steam which is first enriched with boric acid and then evacuated continuously from the reactor (1 or 10).

    摘要翻译： 从含有硼酸的液体中分离出硼酸的方法，特别是从核废料的废液中分离出硼酸，其特征在于将含硼酸的液体连续供入具有非碱性环境的反应器（1或10）中， 通过首先用硼酸富集然后从反应器（1或10）连续排出的蒸汽蒸发除去硼酸。

    VERFAHREN ZUR HERSTELLUNG KONZENTRIERTER SALPETERSÄURE SOWIE ANLAGE ZUR DURCHFÜHRUNG EINES SOLCHEN VERFAHRENS
    7.
    发明公开
    VERFAHREN ZUR HERSTELLUNG KONZENTRIERTER SALPETERSÄURE SOWIE ANLAGE ZUR DURCHFÜHRUNG EINES SOLCHEN VERFAHRENS 无效
    用于生产浓硝酸和安装执行该方法

    公开(公告)号：EP1284928A1

    公开(公告)日：2003-02-26

    申请号：EP00943726.0

    申请日：2000-05-22

    申请人： QVF Engineering GmbH

    发明人： DICHTL, Gottfried ,  DORSTEWITZ, Frank ,  SASSENBERG, Manfred ,  WALTER, Ulrich

    IPC分类号： C01B21/44

    CPC分类号： B01D3/40 ,  C01B21/44 ,  Y10S159/19 ,  Y10S159/20

    摘要： The invention relates to a method for producing a nitric acid with a concentration of 75 to 99.9 % from a more dilute nitric acid. According to said method, a nitric acid with a concentration of approximately 45 to 70 % is rectified in contact with a liquid extraction agent in order to prevent the formation of a nitric acid-water-azeotrope, the vapors of the concentrated nitric acid are condensed and a concentrated nitric acid is obtained. The extraction agent is also reprocessed by reconcentration and returned to the extractive rectification process. The nitric acid to be concentrated is fed into said extractive rectification process, which is preferably carried out in two columns (K1.0, K1.1), as a boiling liquid or in a partially evaporated form, using the quantities of heat (W2, W5) that are available throughout the method. Nitric acid is added to the extraction agent before being fed into the extractive rectification process. The energy required is supplied to the extractive rectification process by indirect heating (W4, W8) and the extraction agent is supplied to the extractive rectification process in as concentrated a form as possible in order to minimize the quantity of extracting agent in the circuit and maximize energy use while ensuring maximum dilution of the extraction agent leaving the extractive rectification process.

    RECOVERY OF ANHYDROUS ALKANESULPHONIC ACIDS
    8.
    发明公开
    RECOVERY OF ANHYDROUS ALKANESULPHONIC ACIDS 失效
    恢复自由水的烷烃

    公开(公告)号：EP0948479A1

    公开(公告)日：1999-10-13

    申请号：EP97951507.0

    申请日：1997-12-02

    申请人： THE DOW CHEMICAL COMPANY

    发明人： NGUYEN, Son, T. ,  CLEMENT, Katherine, S. ,  WALKER, Louis, L.

    IPC分类号： C07C37 ,  C07C39 ,  C07C303 ,  C07C309

    CPC分类号： C07C37/20 ,  C07C303/44 ,  Y02P20/582 ,  Y10S159/19 ,  C07C309/04 ,  C07C39/215

    摘要： The present invention is a process for removing water from an alkanesulfonic acid such as methanesulfonic acid or ethanesulfonic acid by mixing an azeotropic excess of a phenolic compound with water and the alkanesulfonic acid, then boiling off substantially all of the water, and leaving as a remnant substantially all the alkanesulfonic acid and some of the phenol. This process is particularly useful for recycling an alkanesulfonic acid for a reaction which requires the phenolic compound as one of the reagents. One such reaction is the alkanesulfonic acid catalyzed condensation reaction of a phenolic compound with an α-haloketone to form a chlorinated intermediate of a dihydroxy-α-alkylstilbene such as 4,4'-dihydroxy-α-alkylstilbene (DHAMS).

    DEHYDRATION OF ACETIC ACID BY AZEOTROPIC DISTILLATION IN THE PRODUCTION OF AN AROMATIC ACID
    10.
    发明授权
    DEHYDRATION OF ACETIC ACID BY AZEOTROPIC DISTILLATION IN THE PRODUCTION OF AN AROMATIC ACID 失效
    醋酸通过共沸蒸馏脱水在芳香酸的形成

    公开(公告)号：EP0777640B1

    公开(公告)日：1999-07-28

    申请号：EP95927901.9

    申请日：1995-08-16

    申请人： E.I. DU PONT DE NEMOURS AND COMPANY

    发明人： PARTEN, William, David ,  URE, Alan, Macpherson

    IPC分类号： C07C53/08 ,  C07C51/46 ,  C07C63/26 ,  C07C51/265

    CPC分类号： C07C51/265 ,  C07C51/46 ,  Y10S159/19 ,  Y10S203/20 ,  C07C63/26 ,  C07C53/08

    摘要： In a process for production of an aromatic dicarboxylic acid such as terephthalic acid by the liquid phase oxidation of a precursor (e.g. p-xylene) thereof, an overheads stream (10) comprising aqueous aliphatic carboxylic acid is subjected to azeotropic distillation in column (12) to reduce the water content. The azeotropic distillation may be carried out using reflux of the entrainer only (22) with control of entrainer penetration to obtain a bottoms product (34) which is substantially entrainer free and contains a predetermined amount of residual water. Any aromatic dicarboxylic acid precursor present in the overheads stream is separated from the aliphatic carboxylic acid by withdrawal at a location (24) in the vicinity of the point of introduction of the feed (10) into the column. The amount of water in the bottoms product (34) may be controlled by regulation of a separate water feed (76) to the lower section of the azeotropic distillation column. In addition, regulation of the reflux rate (via line 22) may be employed to control the water content of the bottoms product and maintain column operation in the event of loss of feed to the column.