摘要:

AbstractInterface physics in chemical engineering – practical examples. A series of practical examples is used to demonstrate the possible ways in which interface physics can help the chemical engineer in his work. The article first presents some fundamental principles of interface physics and appropriate methods and model concepts. It is then shown how this armamentarium can be profitably applied in specific cases: questions of coating, formulation, adhesion, granulation of powders, production of trickling films, and flotation are considered. It becomes very clear that interfacial effects have a very wide and far‐reaching influence on industrial processes. The problems encountered can be solved only by close cooperation between chemical engineers and interface physici

ISSN:0009-286X    

DOI:10.1002/cite.330580702

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractA concept for the design of pulsed sieve‐plate extractors. A concept is presented for the design of pulsed sieve‐plate extractors (PSE) according to which the column diameter is calculated via the flooding load and the column length by concentration profiles using the well known backmixing models. This concept requires some parameters to describe the hydrodynamic and mass transfer behaviour. The parameters depend on physical properties, operating conditions, and extractor geometry and subject to mutual influence. It is now possible to present correlations and models for prediction of these parameters. The mass transfer term can be determined by Sherwood correlations for single drops, using the Sauter mean drop diameter. The total mass transfer coefficient can be given as a function of column lenght. The calculated concentration profiles agree well with the measured profiles and thus the concept is confir

ISSN:0009-286X    

DOI:10.1002/cite.330580703

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractDescription of particle precipitation by inertial forces by means of a group derived by dimensional analysis. The fractional degree of precipitation depends upon many operating parameters: these can be attributed to three independent dimensionless groups: the Stokes, the Reynolds, and the Euler number. On the basis of extensive experimental material, dimensional analysis shows that, for sufficiently large Reynolds numbers and in a large range of the Euler number, the inertial precipitation depends upon a single dimensionless group, the precipitation parameter ΨA. It can be regarded as the ratio of two energies, viz. a characteristic precipitation energy, expressed as the product of the inertial energy of the particle and the pressure drop coefficient of the precipitators, and a frictional energy dissipated in the boundary surface of the impact body. Thus inertial precipitation is transformed from a complicated flow problem into an energetic problem in which pressure drop plays a major role. Simple approximation formulae can be given for the fractional degree of precipitation and the limiting droplet size for all types of separators

ISSN:0009-286X    

DOI:10.1002/cite.330580704

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractSensor technology in the chemical process industries – status and trends. Sensor technology is used in chemical process industries to provide information on product and process properties. The computerized handling of this information has altered the requirements for sensor systems. New production methods and the automation of existing processes lead to new tasks for sensor systems. The advancement of sensor technology is proceeding on a broad front and in small steps, also exploiting the potential of microelectronics. Model‐based measuring methods utilizing a priori knowledge about the process may substantially increase the information g

ISSN:0009-286X    

DOI:10.1002/cite.330580705

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractMechanical separation of bioproducts. A great variety of processes and equipment are available for mechanical separation of particles from liquids which have proved of value in the chemical industry or in water treatment. Only a small selection of this broad spectrum of sedimentation, filtration, or flotation processes and equipment can be considered for bioproducts – the limiting factor being the unfavourable separation properties. Only slight differences in density, small particle sizes, and the high compressibility of the filter cakes also require very careful adaptation to the specific separation tas

ISSN:0009-286X    

DOI:10.1002/cite.330580706

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330580707

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractParticle‐sizing by dynamic light scattering. The range of applications of colloidal systems is often defined merely by their particle‐size distribution. Dynamic light scattering has proven to be a fast and precise technique for sizing particles in the range of 3 nm to 3 μm. This paper describes the basis of measurement and the method of data analysis. Numerous applications of dynamic light scattering in the chemical industry are also g

ISSN:0009-286X    

DOI:10.1002/cite.330580708

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330580709

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330580710

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330580711

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY