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  • Wiley-Blackwell  (157)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 2393-2398 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Internal cathodic protection of salt water pipelines with the aid of platinized titanium anodesIn petroleum production heavy corrosion occurs in the salt water injecting or flooding pipelines. This corrosion can be eliminated either with the aid of a passive protection (protective coating) or, better, by means of an active protection, i.e. cathodic protection with impressed current. While short pipelines can be protected economically with rod anodes, a continuous, partially platinized titanium wire anode has proven must successful for long pipelines. Particular attention must be devoted to the problem of the current feed. The current density required for the protection of bare pipeline surfaces is in the order of 150 mA/sq.m. It can be considerably reduced by combining the active protection with a passive protection by a coating. In connection with the problem of a suitable reference electrode for measuring the protective potential in high pressure pipelines, experiments have been carried out to determine the protective current requirements in a stagnant and a flowing electrolyte respectively. Finally the question of the economy of the process is shortly discussed.
    Notes: Bei der Erdölförderung treten in Salzwassereinpreß- und --flutungsleitungen starke Korrosionen auf. Dieser Korrosion kann man mit einem passiven Schutz (durch Aufbringen eines Schutzanstriches) oder besser mit einem aktiven Schutz, dem kathodischen Korrosionsschutz mit. Fremdstrom, begegnen. Während in kurzen Rohrleitungen einzelne Stabanoden eingesetzt werden können, hat sich bei langen Rohrleitungen eine partiell platinierte Titandrahtanode bewährt. Dabei ist der Stromeinspeisung besondere Aufmerksamkeit zu schenken. Bei blanker Rohroberfläche liegt der Schutzstrombedarf bei 150 mA/m2. Er kann durch Kombinieren des aktiven Schutzes mit einem passiven Schutz (Anstrich) stark reduziert werden. Im Zusammenhang mit dem Problem einer geeigneten Referenzelektrode für die Schutzpotentialmessung in Druckrohrleitungen wurde versucht, den Schutzstrombedarf bei ruhendem und fließendem Elektrolyten festzustellen. Zum Abschluß wird auf Fragen der Wirtschaftlichkeit des Verfahrens eingegangen.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 675-678 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 578-581 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 138 (1924), S. 81-103 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In der vorliegenden Arbeit sind die folgenden Resultate erzielt worden:1Für acidimetrische und alkalimetrische Titration ist Berlinerblau als Indikator gut brauchbar.2Stannochlorid und Alkalisulfit lassen sich mit H2O2 und Jodstärke als Indikator in der Kälte gut titrieren, wenn geeignete „Aktivatoren“ angewendet werden.3Stannochlorid läßt sich auch mit Ferrirhodanid als Indikator in der Wärme ohne Aktivatoren mit H2O2 bestimmen.
    Additional Material: 11 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 138 (1924), S. 109-134 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die technisch wichtige Zn-Bestimmung mit K4Fe(CN)6, bei welcher bisher der Endpunkt durch Tüpfeln mit Uranylacetat erkannt wurde, läßt sich wesentlich verbessern durch Anwendung von etwas KMnO4 als Indikator. An einem Rotguß wird die praktische Brauchbarkeit der neuen Methode erwiesen.
    Additional Material: 16 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0947-6539
    Keywords: catalysis ; crystal structure ; oxidations ; rhenium peroxo complexes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rhenium oxides Re2O7 and ReO3 react with hydrogen peroxide solutions yielding peroxo complexes that efficiently catalyze the oxidation of olefins, aromatics, and certain organometallic compounds. In contrast, related oxides of molybdenum (MoO3) and vanadium (V2O5) do not activate H2O2 under comparable conditions. The active rhenium peroxo complex was isolated from the system Re2O7/H2O2: the crystalline red-orange, explosive compound of formula H4Re2O13 is the most oxygen rich rhenium compound isolated to date. Its structure resembles a “peroxo perrhenic acid”. The binuclear compound could be isolated in the form of a diglyme adduct, structurally defined as two corner-sharing pentagonal bipyramids with apical oxo and aquo ligands; the equatorial positions are occupied by the bridging oxygen and by n2-peroxo groups (two [O2]2- ligands per rhenium). In contrast to the known complex [CH3ReO(O2)2].H2O, the new peroxo species [O{ReO(O2)2.H2O}2] decomposes hydrolytically during the catalytic cycle and can thus not compete in terms of catalytic activity in oxidation reactions involving H2O2. Hydrolysis yields “perrhenic acid” Re2O7.2H2O, the diglyme adduct of which compound was also characterized by means of an X-ray diffraction analysis.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 697-702 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Matrix-assisted laser desorption/ionization mass spectrometry was used for the characterization of extracted and synthesized oligo(ethylene terephthalate)s. Generally, cyclic oligomers [GT]n could be found in technical yarns and tiles, whereas our synthesized model oligomers mainly consisted of linear chains H—[GT]n—G. In addition, some other distributions could be identified as H—[GT]n—OH and H—[GGT]1—[GT]n-1—G linear oligomers and H—[GGT]1—[GT]n-1 cyclic oligomers, where G is an ethylene glycol unit, GG is a diethylene glycol unit, caused by impurities of ethylene glycol, and T is a terephthalic acid unit. NMR and IR investigations were carried out to verify these results.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 97 (1981), S. 161-169 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Imidazol enthaltende Polymere wurden durch polymeranaloge Reaktion von Poly(ethylen-methacrylat-arylsulfonaten) mit substituierten Imidazolderivaten hergestellt. Die Imidazolderivate mit exocyclischen funktionellen Gruppen wurden an die Polymermatrix über Seitenketten gebunden. Durch weitere polymeranaloge Reaktionen wurden die exocyclischen funktionellen Gruppen zu Imidazol enthaltenden Polymeren mit primären Aminogruppen oder Carboxylgruppen umgesetzt.
    Notes: Imidazole containing polymers were synthesized by polymer-analogous reactions of poly(ethylene methacrylate arylsulfonates) with substituted imidazole derivatives. The imidazole derivatives with exocyclic functional groups were bound to the polymer matrix via spacers. By further polymer-analogous reactions the exocyclic functional groups were modified, so as to give rise to imidazole containing polymers with primary amino groups or carboxyl groups.
    Additional Material: 3 Tab.
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  • 10
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Neue Imidazol enthaltende Polymere wurden durch nucleophile Substitutionsreaktionen von Poly(ethylen-methacrylatarylsulfonaten) mit Imidazol, Benzimidazol und einigen Derivaten hergestellt. Die Reaktionszeit und die verwendeten Lösungsmittel zeigten wechselnde Effekte auf die Geschwindigkeiten. Der Umsatz war am besten reproduzierbar bei hohen Reaktionsgeschwindigkeiten in Ethanol.
    Notes: New imidazole containing polymers were synthesized by nucleophilic substitution reactions of poly(ethylene methacrylate arylsulfonates) with imidazole, benzimidazole and some of their derivatives. The reaction time and the solvents used had varying effects on the binding rates. The conversion was best reproducible at high reaction speed in ethanol.
    Additional Material: 2 Tab.
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