AAVOS International bvba has a wide range of online process instrumentation for many applications in chemical, petrochemical, oil, gas, food, beverage and pharmaceutical industry.
We will advise you to find the right equipment for your analysis of fluids, gasses and solids.
Process on-line analysers are offered as a solution to the efficiency of plant operation and offer huge paybacks. Our analysers are also applied for monitoring emissions and as safety measurement.
Dry colorimetric method
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Since the creation of oil refining, a variety of treatment methods have been used to remove non-hydrocarbon impurities and other constituents. These compounds reduce the efficiency of the conversion processes and reduce the quality of the finished products. It is necessary to remove impurities from blending stocks in several processes such as treatment, drying and sweetening. There are many analytical methods used in industrial settings for the quantitative analysis of impurities, but not all are efficient and cost effective. Companies need methods that are fast, precise, versatile and virtually interference-free. One technique that fulfills these demands is the dry colorimetric method. This technique can measure at ultra-low detection ranges from parts per million (ppm), to parts per billion (ppb). In addition to meeting ultra-low-levels, it is considered safe and non-toxic. For the user, simple care as you would for household cleaners would suffice. The dry colorimetric method is a simple and easy way to measure impurities in reactions where hydrocarbons are used as reactants. This method is suited for elemental analysis as well as total analysis in process or in a laboratory setting depending on the application. Many chemical and petrochemical processes require expensive catalysts to materialize their final product, however, their catalyst can be destroyed by impurities or by-products contained in the reaction.
Dry Colorimetric Detector Technique to detect impurities in samples, is still the most widely used and reliable technique. It utilises an impinger to collect gas in a liquid medium. Chemical reagents are then added to the medium to cause it to change colour in proportion to the concentration of gas present. The resulting colour change is measured by a laboratory spectrophometer and compared to standards. While the Tape Detection System is extremely sensitive to its target gas, it is also very specific to that gas. It will not react to other substances (solvents, hydrocarbons, etc.) often found in process streams. Thus, expensive downtime due to false alarms is virtually eliminated.
Inline : For inline analysis, a sensor can be placed in a process vessel or stream of flowing material to conduct the analysis. Online : Analysers which are connected to a process, and conduct automatic sampling, can be called online (or on-line) analysers or sometimes inline (or in-line) analysers. This means that online and inline analyses permit continuous process control. Offline and atline analyses, on the other hand, are characterized by manual sampling followed by discontinuous sample preparation, measurement and evaluation. The material properties can change during the time between sampling and the availability of the results, so direct process control is not possible. A bypass line is recommended in terms of process control to prevent a shutdown or lost product. If you have to clean, calibrate or validate ypour analyser a lot, then a bypass is the best solution.
The thermal conductivity detector (TCD), also known as a Katharometer, is a bulk property detector and a chemical specific detector commonly used in gas chromatography.[1] This detector senses changes in the thermal conductivity of the column effluent and compares it to a reference flow of carrier gas. Since most compounds have a thermal conductivity much less than that of the common carrier gases of helium or hydrogen, when an analyte elutes from the column the effluent thermal conductivity is reduced, and a detectable signal is produced. The TCD consists of an electrically heated filament in a temperature-controlled cell. Under normal conditions there is a stable heat flow from the filament to the detector body. When an analyte elutes and the thermal conductivity of the column effluent is reduced, the filament heats up and changes resistance. This resistance change is often sensed by a Wheatstone bridge circuit which produces a measurable voltage change. The column ...
Near-infrared spectroscopy (NIRS) is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from about 700 nm to 2500 nm). Typical applications include medical and physiological diagnostics and research including blood sugar, pulse oximetry, functional neuroimaging, sports medicine, elite sports training, ergonomics, rehabilitation, neonatal research, brain computer interface, urology (bladder contraction), and neurology (neurovascular coupling). There are also applications in other areas as well such as pharmaceutical, food and agrochemical quality control, atmospheric chemistry, combustion research and astronomy. credits wiki
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