ISSN:0009-286X    

DOI:10.1002/cite.330511002

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractSafe chemical plants – a constant challenge to technology. The general public is increasingly questioning the safety of industrial plants. In the field of chemistry, in particular, the impression is being evoked that especially serious and continually increasing risks are in evidence in chemical plants. To begin with, the present report proves by means of statistical data that such portrayals are not in keeping with the facts. Then the safety concept in the planning and operation of chemical plants is discussed. With the aid of examples the ceaseless and successful endeavours towards achieving ever greater safety are described. Examples from the field of systematic research in industrial safety are also cited. Finally, the report deals with the plant operators' own responsibility, and cooperation with supervisory bodies and governmental control organization

ISSN:0009-286X    

DOI:10.1002/cite.330511003

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractDust extraction from hot gases. The introduction of new, energy‐saving, and low‐pollution technologies required development of highly efficient systems for purifying dustloaden hot gases at temperatures between 500 and 1000°C and pressures between 1 and 20 bar. The present state of dust removal is described for separators utilizing gravitational forces, electrical effects, filtration, and wet techniques, and typical applications of present‐day dust extraction from hot gases are presented. Possible developments with a view to extending the scope of dust extraction are ind

ISSN:0009-286X    

DOI:10.1002/cite.330511004

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractUndesired reactions of organic substances as sources of danger in chemical plant. In chemical production processes, danger can arise both from the intended exothermal reaction and from unintended exothermal reactions. Such “undesired” reactions may be exothermal reactions of the substances themselves (e.g. decomposition, polymerization) or reactions of the substances involved with one another (e. g. of a reactant with the solvent). Differential thermal analysis and warm storage have been successfully used in various modifications as experimental methods for the study of such reactions. For exothermal decomposition reactions, correlations can be made between the chemical constitution of the substances and the energy released on decomposition, as well as the temperature of incipient decomposition. In mixtures with other substances a modified decomposition behaviour must be expected, usually of such a kind that the temperature range of decomposition is lowered. There are many possible exothermal reactions of substances with one another; only a few have hitherto been studied in det

ISSN:0009-286X    

DOI:10.1002/cite.330511005

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractTurbulence in the continuous phase of fluid/particle systems. Neglecting a number of important transition systems, the principal multiphase systems in chemical engineering can be subdivided into particle systems, film systems, and jet systems. In studies on turbulent processes in these systems, five different kinds of turbulence are distinguished: (1) Reynolds turbulence; (2) interfacial turbulence; (3) deformational turbulence; (4) lattice turbulence; and (5) swarm turbulence. Although existing knowledge provides a good picture of turbulent processes in multiphase systems, one is still far removed from being able to satisfactorily describe every from of turbulence and its effect on mass‐ and heat transfer. Moreover, there is still a great lack of reliable data regarding the conditions under which these kinds of turbulence can be expecte

ISSN:0009-286X    

DOI:10.1002/cite.330511006

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractHeat transfer in agitated vessels with single‐phase liquids. This article deals with the heat transfer in agitated vessels with single‐phase Newtonian and non‐Newtonian liquids. The following topics are discussed: influence of the hydrodynamics on the heat transfer behaviour; description of the heat transfer with the aid of dimensional analysis; heat transfer correlations for agitated liquids; efficiency of the usual impellers with regard to the heat transfer; and scale‐up of agitated systems in the case of heat removal or heat supply. The various correlations suited for the prediction of the rate of heat transfer in both jacketed vessels and vessels with heating or cooling coils are tabulated for agitation produced by turbines (flat blades, disk flat blades, and pitched blades), propeller, anchors, paddles, and helical ribbons. These tables are available from the “Lehrstuhl für Thermische Verfahrenstechnik, Universität Dortmund, Postfach 500 500, D‐4

ISSN:0009-286X    

DOI:10.1002/cite.330511007

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractLow‐density polyethylene. The constantly changing economic situation requires periodic re‐assessment of the general direction of process and product development. This contribution surveys the present state of the art of high‐pressure polyethylene synthesis with due consideration of recent developments. Starting from chemical and chemical‐engineering fundamentals, the various polymerization processes and their products are compared and contrasted, and an attempt is made to predict further devel

ISSN:0009-286X    

DOI:10.1002/cite.330511008

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330511009

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330511010

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330511011

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY