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17 条记录 (耗时 0.014 秒)

    Process for gas phase delignifying wood pulp using chlorine dioxide at subatmospheric pressure
    1.
    发明授权
    Process for gas phase delignifying wood pulp using chlorine dioxide at subatmospheric pressure 失效
    使用二氧化氯在低于大气压的气相脱木质木浆的方法

    公开(公告)号：US5474654A

    公开(公告)日：1995-12-12

    申请号：US142889

    申请日：1993-10-25

    申请人： Sudhir K. Mendiratta ,  David W. Cawlfield

    发明人： Sudhir K. Mendiratta ,  David W. Cawlfield

    IPC分类号： C01B11/02 ,  D21C9/14

    CPC分类号： C01B11/025 ,  D21C9/14

    摘要： A process for gas phase delignifying wood pulp comprising: contacting wood pulp in the first stage of pulp bleaching with chlorine dioxide-containing gas to delignify said wood pulp; wherein(a) said wood pulp has a consistency of at least about 15 percent;(b) said chlorine dioxide-containing gas contains less than about 3% by weight chlorine gas, based on the weight of chlorine dioxide in said gas; and(c) said contacting is conducted at a subatmospheric pressure from about 15 to about 750 mm Hg. This process reduces the formation of chloroform and significantly reduces the amounts of toxic by-products such as dioxin and other organic chlorides. These undesirable by-products, collectively identified as absorbable organic halides (AOX), require effluents from pulp bleaching processes to undergo expensive treatment methods to eliminate AOX's prior to discharges to sewers. The effluent discharge from this process generally has less than 2.0 kg adsorbed organic halides (AOX) per ton of wood pulp. The pulp produced by this process has a brightness and viscosity that meet or exceed the requirements of industrial papermaking.

    摘要翻译： 一种用于气相脱木质木浆的方法，包括：在纸浆漂白的第一阶段使木浆与含二氧化氯的气体接触，以使所述木浆脱木质; 其中（a）所述木浆具有至少约15％的稠度; （b）所述含二氧化氯的气体基于所述气体中二氧化氯的重量含有小于约3重量％的氯气; 和（c）所述接触在约15至约750mm Hg的低于大气压的压力下进行。 该方法可减少氯仿的形成，并显着减少有毒副产物如二恶英和其他有机氯化物的量。 统称为可吸收有机卤化物（AOX）的这些不合需要的副产物要求来自纸浆漂白工艺的废水经历昂贵的处理方法，以在排放到下水道之前消除AOX。 来自该方法的污水排放通常具有小于2.0kg的每吨木浆吸附的有机卤化物（AOX）。 该方法生产的纸浆具有满足或超过工业造纸要求的亮度和粘度。

    Process for producing chlorine dioxide
    2.
    发明授权
    Process for producing chlorine dioxide 失效
    二氧化氯生产工艺

    公开(公告)号：US5342601A

    公开(公告)日：1994-08-30

    申请号：US925006

    申请日：1992-08-05

    申请人： David W. Cawlfield ,  Sudhir K. Mendiratta

    发明人： David W. Cawlfield ,  Sudhir K. Mendiratta

    IPC分类号： C01B11/02

    CPC分类号： C01B11/023

    摘要： A process which comprises heating a reaction mixture comprised of an aqueous solution containing perchlorate ions, chlorate ions and hydrogen ions to produce chlorine dioxide and oxygen gas.The novel process of the present invention provides a commercially viable process for producing chlorine dioxide from mixtures of oxy-chlorine species in the absence of a reducing agent. The process can be operated without producing an acidic salt by-product while producing a chlorine dioxide product which is substantially free of chlorine. In addition, the process of the invention permits a reduction in the amount of acid fed to the chlorine dioxide generator.

    摘要翻译： 一种方法，包括加热由含有高氯酸根离子，氯酸根离子和氢离子的水溶液组成的反应混合物，以产生二氧化氯和氧气。 本发明的新方法提供了在不存在还原剂的情况下从氧 - 氯物质的混合物中生产二氧化氯的商业上可行的方法。 该方法可以在不产生酸性盐副产物的情况下进行操作，同时生产基本上不含氯的二氧化氯产物。 此外，本发明的方法允许减少进料到二氧化氯发生器中的酸的量。

    Conductor assembly for electrolytic cells
    3.
    发明授权
    Conductor assembly for electrolytic cells 失效
    电解槽导体组件

    公开(公告)号：US4308125A

    公开(公告)日：1981-12-29

    申请号：US113921

    申请日：1980-01-21

    申请人： Jerry J. Kaczur ,  Sudhir K. Mendiratta

    发明人： Jerry J. Kaczur ,  Sudhir K. Mendiratta

    IPC分类号： C25B9/04

    CPC分类号： C25B9/04

    摘要： A current conductor assembly for conducting electric current to electrodes in cells for the electrolysis of a salt solution is comprised of a conductor and a nonconductive casing for the conductor. There is a space between the conductor and the casing with an inlet in the casing for receiving a fluid. The conductor assembly has means for supplying a pressurized fluid to the space between the conductor and the casing; means for sealingly attaching one end of the conductor assembly to the electrodes, where this end is immersed in the salt solution; and a compressible sealing assembly for the opposite end of the conductor assembly comprised of a compression means and a sealing means.The conductor assembly employs the pressurized fluid to prevent corrosive attack of the conductor metal should a leak develop in the conductor assembly.

    摘要翻译： 用于将电流传导到用于电解盐溶液的电池中的电极的电流导体组件由用于导体的导体和非导电壳体构成。 在导体和壳体之间有一个空间，壳体中有一个用于接收流体的入口。 导体组件具有用于将加压流体供应到导体和壳体之间的空间的装置; 用于将导体组件的一端密封地连接到电极的装置，其中该端浸入盐溶液中; 以及用于由压缩装置和密封装置组成的导体组件的相对端的可压缩密封组件。 导体组件采用加压流体，以防止在导体组件中产生泄漏时导体金属的腐蚀性侵袭。

    Process for the purification of alkaline solution of lower alkyl alcohols containing alkali metal alkoxides
    4.
    发明授权
    Process for the purification of alkaline solution of lower alkyl alcohols containing alkali metal alkoxides 失效
    用于纯化含有碱金属醇盐的低级烷基醇的碱性溶液的方法

    公开(公告)号：US4293721A

    公开(公告)日：1981-10-06

    申请号：US175175

    申请日：1980-08-04

    申请人： Sudhir K. Mendiratta

    发明人： Sudhir K. Mendiratta

    IPC分类号： C07C29/09 ,  C07C29/76 ,  C07C29/80 ,  C07C29/88

    CPC分类号： C07C29/80 ,  C07C29/09 ,  C07C29/76 ,  C07C29/88

    摘要： A novel process for purifying an alkaline solution of a lower alkyl alcohol containing as an impurity an alkali metal alkoxide, an alkali metal hydroxide, and water is disclosed. The process comprises treating the alkaline solution of a lower alkyl alcohol with an anhydrous hydrogen halide to react with the alkali metal alkoxide and the alkali metal hydroxide to provide a neutral solution comprised of the lower alkyl alcohol, an alkali metal halide and water. The alkali metal halide is removed from the neutral solution to obtain a substantially salt-free solution comprised of the lower alkyl alcohol and water. A zeolite molecular sieve is contacted with the solution to remove the water and to recover a substantially anhydrous solution of a lower alkyl alcohol. The process produces purified substantially anhydrous alcohol solutions suitable for the use in the production of alkali metal alkoxides such as sodium methoxide without introducing undesired amounts of alkaline impurities into the product.

    摘要翻译： 公开了一种用于纯化含有碱金属醇盐，碱金属氢氧化物和水作为杂质的低级烷基醇的碱性溶液的新方法。 该方法包括用无水卤化氢处理低级烷基醇的碱性溶液与碱金属醇盐和碱金属氢氧化物反应，得到由低级烷基醇，碱金属卤化物和水组成的中性溶液。 从中性溶液中除去碱金属卤化物，得到由低级烷基醇和水组成的基本上无盐的溶液。 使沸石分子筛与溶液接触以除去水并回收基本上无水的低级烷基醇溶液。 该方法产生适用于生产碱金属醇盐如甲醇钠的纯化的基本上无水的醇溶液，而不会在产品中引入不需要量的碱性杂质。

    Process for producing pentachloro-nitrobenzene
    5.
    发明授权
    Process for producing pentachloro-nitrobenzene 失效
    五氯硝基苯生产工艺

    公开(公告)号：US4147732A

    公开(公告)日：1979-04-03

    申请号：US881272

    申请日：1978-02-27

    申请人： Sudhir K. Mendiratta

    发明人： Sudhir K. Mendiratta

    IPC分类号： C07C205/12 ,  C07C79/12

    CPC分类号： C07C201/08

    摘要： An improvement is disclosed in the preparation of pentachloronitrobenzene by the nitration of pentachlorobenzene. The improvement, which is primarily aimed at reducing the residual level of the undesirable starting material, pentachlorobenzene, in the product, includes a two-stage reactant mixing step wherein the pentachlorobenzene is first mixed with sulfuric acid and then concentrated nitric acid is added to this mixture.

    摘要翻译： 通过五氯苯硝化制备五氯硝基苯时，已经有一些改进。 主要目的在于降低产品中不需要的原料五氯苯的残留水平的改进​​包括两阶段反应物混合步骤，其中五氯苯首先与硫酸混合，然后向其中加入浓硝酸 混合物。

    Process for producing chlorine dioxide
    9.
    发明授权
    Process for producing chlorine dioxide 失效

    公开(公告)号：US5165911A

    公开(公告)日：1992-11-24

    申请号：US703432

    申请日：1991-05-17

    申请人： David W. Cawlfield ,  Sudhir K. Mendiratta

    发明人： David W. Cawlfield ,  Sudhir K. Mendiratta

    摘要： A process which comprises heating a reaction mixture comprised of an aqueous solution containing perchlorate ions, chlorate ions and hydrogen ions to produce chlorine dioxide and oxygen gas.The novel process of the present invention provides a commercially viable process for producing chlorine dioxide from mixtures of oxy-chlorine species in the absence of a reducing agent. The process can be operated without producing an acidic salt by-product while producing a chlorine dioxide product which is substantially free of chlorine. In addition, the process of the invention permits a reduction in the amount of acid fed to the chlorine dioxide generator.