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  • Articles  (19)
  • Polymer and Materials Science  (11)
  • Industrial Chemistry  (8)
  • 1995-1999  (6)
  • 1985-1989  (9)
  • 1960-1964  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Pressure pulsations in the piping of reciprocating pumps (1987)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 10 (1987), S. 262-271 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pressure pulsations in hydraulic systems, generated by reciprocating pumps, can cause serious problems with regard to plant safety and reliability. In particular, fatigue problems arise in high-pressure piping systems. The available knowledge is not sufficient for an accurate computation of pressure peaks in the piping of reciprocating pumps. A number of calculation models are available which, however, neglect both fluid compressibility and friction. This contribution presents a calculation method which allows a precise modelling of various pump installations. Comparison of calculated and experimental data shows a good agreement and provides a validation of the computational model.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270100132
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of hydrolyzed pH responsive ion track membraneSystematic IUPAC name: diallyl oxydiethylene dicarbonate. (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 16 (1995), S. 47-51 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The porous copolymer films of N-methacryloyl-L-alanine methyl ester and diethyleneglycol-bis-allylcarbonate (diallyl oxydiethylene dicarbonate) were hydrolyzed with 1 M NaOH solution for 40 min at 25°C. The pores of the films showed pH response in diameter. The pore diameter of 3,7 μm in the buffer solution of pH 3 was closed completely at pH 5.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1995.030160109
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen an Dosierpumpen für die VerfahrenstechnikVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 6. bis 8. Oktober 1963 in Hannover. (1964)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 36 (1964), S. 185-191 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Anwendungsmöglichkeiten von Dosierpumpen in der Verfahrenstechnik werden durch Fördermedium, Druck, Temperatur und Fördermenge bestimmt. Das Förderverhalten oszillierender Verdrängerpumpen ist vor allem von der Kompressibilität, der Viscosität und dem Dampfdruck des Fördermediums abhängig. Untersuchungen zur Ermittlung der Dosiergenauigkeit bei verschiedenen Bedingungen zeigen, daß Dosierpumpen bei geeigneter Ausführung und passenden Randbedingungen genau arbeiten. Für die Gewährleistung der Dosiergenauigkeit sind Maßnahmen erforderlich, um den Verschleiß niedrig zu halten. Besondere Anforderungen stellen Entwicklung und Bau von Dosierpumpen für Drucke bis 3000 at.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330360304
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  • 4
    Electronic Resource
    Electronic Resource
    Durchflußkontrolle kleiner Dosierpumpen bei stetiger und pulsierender StrömungVortrag von G. Vetter auf dem Jahrestreffen der Verfahrens-Ingenieure, 30. Sept. bis 2. Okt. 1987 in Freiburg. (1988)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 60 (1988), S. 672-685 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Flow control for small metering pumps with continuous and pulsating flow. Metering of small flows with high discharge pressure is performed mainly by displacement metering pumps. The necessary mass-flow control shows problems with pulsating piston- or diaphragm metering pumps. A survey explains the presently available continuous and discountinuous methods of mass- and volume flow control. Special investigations have been performed with differential scales and mass flow meters based on the Coriolis- and the thermal principle. The differential weighing method shows good accuracy down to minimum mass flows of 0.1 kg/h. This method is expensive and requires vibration protected installation. The Coriolis flow meter, applicable over a similar range, precisely integrates the pulsating signal, but requires damping or signal averaging for regulation purposes. Thermal flow meters prove rather sensitive to temperature fluctuations. Under stable conditions and with proper calibration this principle may be applied to flows even below 0.1 kg/h.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330600905
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  • 5
    Electronic Resource
    Electronic Resource
    Der Dosiervorgang in vertikalen Schneckendosierern (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1184-1185 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306709140
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  • 6
    Electronic Resource
    Electronic Resource
    Wirkmechanismus und Auslegung von vertikalen Rührwerken in Schneckendosiergeräten (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1185-1186 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306709141
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  • 7
    Electronic Resource
    Electronic Resource
    Dosieren von festen und fluiden StoffenVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 19. bis 21. Sept. 1984 in München. (1985)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 57 (1985), S. 395-409 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Dosage of solids and liquids. Dosage of reaction components is an important step in chemical engineering processes. In an age of increasing automation, the development of dosage procedures is highly topical; electronics and data processing have long made inroads into dosage procedures. However, today's more stringent demands with regard to pressure, temperature, viscosity, and abrasion necessitate intensified research and development efforts. The present article considers mainly volumetric and geometric dosage methods. The many types of metering pumps cover a large area of dosage of liquids. Minimal flow rates, pressures up to several 1000 bar, and also dangerous and difficult fluids can all be safely handled. Leakproof designs with membranes, tubes, or bellows as displacement devices are particularly important nowadays. Volumetric dosage of solids requires establishment of a reproducible packing density. The survey considers the principle methods of dosage (also against pressure) with special emphasis on screw dosage. Gravimetric dosage methods are extremely reliable and accurate but generally require volumetric systems for energy supply. Especially when used in combination with metering pumps or screw dosage, differential balances have numerous possible applications.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330570504
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  • 8
    Electronic Resource
    Electronic Resource
    Verschleiß selbsttätiger Pumpenventile durch abrasive SuspensionenErweiterte Fassung eines Vortrages von U. Störk auf der Sitzung des GVC-Fachausschusses „Hochdruckverfahrenstechnik“, 11./12. April 1986 in Erlangen. (1987)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 59 (1987), S. 383-392 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Wear of automatic pump valves by abrasive suspensions. In pumping of abrasive suspensions with reciprocating displacement pumps against high pressures, the pump valves prove to be subject to serious wear. Wear of the piston seal can usually be avoided by washing or by separating membranes. Pump valves are fitted with elastic or rigid seals. To resist corrosion and temperature effects, frequently the only possible approach is to finish them in metallic or carbide materials. The major kinds of wear are demonstrated by a tribological study. The rates of wear found for a real valve model with a high pressure experimental setup depend upon the pressure and frequency of reciprocation. A hardness-dependent region of instability exists where wear scoring arises. The volume wear rate for various arrangements of materials and abrasive particles exhibits a crest/trough nature. A design strategy and construction aspects are considered and compared with practical experience.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330590505
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  • 9
    Electronic Resource
    Electronic Resource
    Dosiergenauigkeit bei der Stoffdosierung (1989)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 61 (1989), S. 136-140 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Accuracy of dosage. Confusion sometimes surrounds the concept of dosage accuracy. For this reason, standard definitions and testing and calculation procedures are proposed for dosage accuracy, dosage error, and dosage constancy. Representation of the relationship between dosage error and dosage constancy within the area of tolerance of the dosage accuracy is new. Since the measurement of all error quantities is always bound to relate terms such as short-term, long-term, and momentary dosage error to a stated time base. This also facilitates a conceptually smooth transition to operating dosage errors observed in long-term operation. It would be convenient if some standardization of the concepts, and possibly a set of rules, could be developed on this basis. Evaluation of measured results on comparing guarantees would then be conducted in relation to the accuracy of measurement.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330610208
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  • 10
    Electronic Resource
    Electronic Resource
    Genauigkeit von Dosierkolbenpumpen (1963)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 35 (1963), S. 267-272 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Obwohl Dosierpumpen in der gesamten Verfahrenstechnik häufig verwendet werden, sind systematische Untersuchungen über die Genauigkeit der Dosieraggregate nicht bekannt geworden. Die vorliegende Arbeit berichtet über meßtechnische Probleme und Versuche bei der Ermittlung der DosiergenauigkeitDie Messungen wurden im Laboratorium der Firma Lewa, Herbert Ott KG., Leonberg, ausgeführt.. Zunächst werden die Begriffe Dosiergenauigkeit, Reproduzierbarkeit und Einstellgenauigkeit und die Methode der Fehlerangabe erläutert. Die mit einer Pumpe bei veränderlicher Hublänge und verschiedenen Drucken im Bereich zwischen 2,5 und 127 atü bei reinem Fördermedium gewonnenen Ergebnisse zeigen, daß unter günstigen Bedingungen Dosierpumpen über einen Mengenbereich von mindestens 1 : 50 mit einem Fehler von weniger als ± 0,1%, bezogen auf die maximale Fördermenge, arbeiten können. Damit erweist sich die Dosierpumpe als ein auch bei großem Regelbereich außerordentlich genaues Gerät.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330350404
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