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    • 24. 发明授权
    • Process for removing acid from cathodic electrocoating baths
    • 从阴极电泳浴中除去酸的方法
    • US4775478A
    • 1988-10-04
    • US90445
    • 1987-08-28
    • Hartwig VossThomas Bruecken
    • Hartwig VossThomas Bruecken
    • C25D13/24B01D13/00B01D15/04
    • C25D13/24
    • The present invention relates to a novel process for removing acids from cathodic electrocoating baths, in which electrically conductive substrates are coated with cationic resins present in the form of aqueous dispersions, part or all of the dip-coating bath being subjected to an ultrafiltration in which the ultrafiltration membrane retains the cationic resin and an ultrafiltrate is formed which contains water, solvent, low molecular weight substances and ions, and part or all of the ultrafiltrate being recycled to the coating bath, in which process(a) part or all of the ultrafiltrate, before recycling to the electrocoating bath and(b) an aqueous solution of an organic or inorganic base, which may or may not contain salts,are each introduced into one or more chambers, separated from one another by an anion exchange membrane, of an exchange cell, solutions (a) and (b) being led over the surface of the membrane.
    • 本发明涉及一种用于从阴极电泳浴中除去酸的新方法,其中导电基底用水分散体形式存在的阳离子树脂涂覆,部分或全部浸涂浴进行超滤,其中 超滤膜保留阳离子树脂,并且形成含有水,溶剂,低分子量物质和离子的超滤液,并且将部分或全部超滤液再循环到涂布浴中,其中(a)部分或全部 超滤液在再循环到电泳浴之前和(b)有机或无机碱的水溶液(其可以含有或可以不含有盐)分别引入一个或多个通过阴离子交换膜彼此分离的室, 交换池,溶液(a)和(b)被引导到膜的表面上。
    • 29. 发明申请
    • METHOD FOR PRODUCING TOLUYLENEDIAMINE BY HYDROGENATING DINITROTOLUENE
    • 通过加氢精氨酸生产戊烯二胺的方法
    • US20110275858A1
    • 2011-11-10
    • US13142718
    • 2009-12-21
    • Joana Coelho TsouSteffen OehlenschlaegerEkkehard SchwabWolfgang MackenrothHartwig VossStefan MaixnerSamuel NetoSven BoehmekeFrederik van Laar
    • Joana Coelho TsouSteffen OehlenschlaegerEkkehard SchwabWolfgang MackenrothHartwig VossStefan MaixnerSamuel NetoSven BoehmekeFrederik van Laar
    • C07C209/36
    • C07C209/36C07C211/50
    • A process for preparing tolylenediamine by hydrogenating dinitrotoluene with hydrogen in the presence of a suspended catalyst in a vertically upright reactor (1), at the upper end of which is arranged a motive jet nozzle (2) through which the reaction mixture drawn off from the reactor bottom, via an external loop, is sprayed into the upper region of the reactor (1) and then flows into a central inserted tube (4) which is arranged in the longitudinal direction of the reactor, flows through the latter from the top downward and flows upward again outside the inserted tube (4) in an internal loop motion, with a heat exchanger (6) in the interior of the reactor (1), through which cooling water flows, and absorbs some of the heat of reaction as it does so, with a feed for the dinitrotoluene at the upper end of the reactor (1) and a feed for the hydrogen at the lower end of the reactor (1), and wherein, in addition to the heat exchanger (6) arranged in the interior of the reactor (1), a further heat exchanger (W) is used in the external loop, in which water absorbs the rest of the heat of reaction by indirect heat exchange with the reaction mixture, which comprises utilizing the heat of reaction to raise steam with a pressure of at least 4 bar gauge by performing the hydrogenation of dinitrotoluene to tolylenediamine at a temperature of ≧180° C.
    • 一种通过在悬浮催化剂存在下用氢气将二硝基甲苯氢化在垂直直立反应器(1)中制备甲苯二胺的方法,其上端设置有动力喷嘴(2),反应混合物从其中排出 反应器底部通过外部环路喷射到反应器(1)的上部区域中,然后流入沿着反应器的纵向布置的中心插入管(4),其从顶部向下流动 并且在反应器(1)的内部具有热交换器(6),内部循环运动再次向外流过插入的管(4),冷却水通过该换热器(6)流过,并吸收一些反应热 用反应器(1)上端的二硝基甲苯进料和反应器(1)下端的氢气进料,并且其中除了设置在反应器(1)的下端的热交换器 反应器(1)的内部,一个furt 她的热交换器(W)用于外部回路中,其中水通过与反应混合物的间接热交换吸收剩余的反应热,其中包括利用反应热量以至少4的压力升高蒸汽 通过在≥180℃的温度下进行二硝基甲苯氢化成甲苯二胺来测定。
    • 30. 发明授权
    • Method for producing sodium dithionite
    • 生产连二亚硫酸钠的方法
    • US07968076B2
    • 2011-06-28
    • US11666973
    • 2005-11-03
    • Armin DiefenbacherHartwig VossReinhard Schneider
    • Armin DiefenbacherHartwig VossReinhard Schneider
    • C01B17/66
    • C01B17/66
    • The invention relates to a process for the preparation of sodium dithionite, comprising the steps (a) provision of a synthesis batch comprising sodium formate, sulfur dioxide and an alkaline sodium compound in aqueous methanolic solution with formation of a sodium dithionite mother liquor, (b) isolation of sodium dithionite from the sodium dithionite mother liquor, a residual mother liquor being obtained, (c) separation of methanol from the residual mother liquor, (d) separation of the residual mother liquor into a thiosulfate-rich first part-stream and a thiosulfate-poor, formate-containing second part-stream by means of nanofiltration, (e) concentration of sodium formate in the second part-stream and (f) recycling of the concentrated second part-stream to process step (a).
    • 本发明涉及一种制备连二亚硫酸钠的方法,包括以下步骤:(a)在形成连二亚硫酸钠母液的水溶液中提供包含甲酸钠,二氧化硫和碱性钠化合物的合成批料,(b )从连二亚硫酸钠母液中分离连二亚硫酸钠,得到残余母液,(c)从残余母液中分离甲醇,(d)将残余母液分离成富含硫代硫酸氢盐的第一部分流, (e)在第二部分流中浓缩甲酸钠,和(f)将浓缩的第二部分物流再循环到工艺步骤(a)中,通过纳滤法生产含有硫代硫酸盐的富含甲酸的第二部分物流。