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"Green Chemstry" in the Laboratory

Using mills as efficient and ecologically friendly synthesis reactors

25-06-2008

The term "green chemistry" is commonly used to describe chemical procedures which meet specific requirements with regards to the conservation of resources and protection of the environment. The objective is to avoid undesired by-products by selecting adequate reaction procedures and media. A typical example is the production of bio fuel which has become an ecologically friendly alternative for many drivers....

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Particle Analysis: Quality Control of Catalysts with Digital Image Processing

24-06-2008

Catalysts are widely used as an important auxiliary material in the chemical and petrochemical industry. They are able to accelerate chemical reactions by lowering the activation energy, i.e. they change reaction kinetics. Thus, using catalysts in industrial processes has the advantage of higher productivity combined with less energy consumption....

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On-line particle analysis in wet processes

02-02-2007

Fully automated particle size measurement technology integrated with existing plant control platforms for ease of use has the potential to deliver numerous benefits. At plants where a switch to on-line analysis has been made it is frequently easier or possible to:...

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Making the connection - particle size, size distribution and rheology

23-01-2007

A number of factors influence the rheology of a suspension, including particle size, particle size distribution, and the volume fraction of solids present. Here we examine the relationship between rheology and particle size parameters. Commonly used rheological terms are described and we present data from example systems to illustrate key points...

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Do you see the complete picture?

"Triple Detection" in Gel Permeation Chromatography

11-11-2005

Gel permeation chromatography (GPC) or also named size exclusion chromatography (SEC) is the most often used method for determining the molecular weight of natural and synthetic macromolecules. One specific strength of this method lies in the fact that by the separation process the whole molecular weight distribution is obtained. The molecular weight distribution contains much larger information for the characterization of polymer samples compared to a single value....

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The Determination of Hazardous Substances According to RoHS and WEEE Directives

28-08-2005

1st July 2006 is an important deadline for the electro- and electronics industries. This date bans hazardous substances like lead, cadmium, mercury, hexavalent chromium and polybrominated biphenyls and diphenyl ethers from electro- and electronic equipment. This restriction, even though in discussion since 1991, has become more and more important from year to year because of tons of electronic waste releasing toxic substances which are accumulated in the environment, the food chain and all human beings. In order to enforce the substances ban and the limitation or substitution of hazardous components, elemental analysis is obviously the most important control measure for monitoring limiting values. This requires precise analytical systems such as X-ray fluorescence, ICP- and atomic absorption spectrometers. These instruments are able to detect trace concentrations of hazardous compounds - for example cadmium, using an atomic absorption spectrometer in the flame atomization mode up to 0.1 mg/L, or using the di...

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Beyond Quality Control

Using design of experiments methodology means increased efficiency and improved product quality.

08-03-2005

Product quality in any arena can be traced back to variations in parts, materials, people, and processes. And since it has been observed that all work can be broken down into processes, all processes, manufacturing or administrative in nature, have inherent variability...

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Pressure Digestion for Sample Preparation

01-02-2005

What analyst does not wish for a universal method for processing all his or her samples? Pressure digestion represents just such a procedure for sample digestions and is therefore one of the standard sample preparation procedures currently employed in analytical chemistry for element quantification...

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Reaching the Next Level of Microwave-assisted Organic Synthesis

27-01-2005

Microwave-assisted organic synthesis (MAOS) has become an increasingly popular discipline in modern chemical method development. At first, reaction optimization and method development on a small scale were the main areas of interest in MAOS. However, the growing acceptance and success of this innovative microwave technology revealed the necessity for large-scale synthesis of valuable compounds using microwave heating, especially in industrial laboratories...

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