Measurement and Testing


This ensures perfect results from the first analysis even when samples are of unknown composition. The core components of the rapiDist-4, i.e., dosing unit, vaporizer, condenser and receiver, are state-of-the-art components and is according to the design specifications set out by ASTM D86.


A new level of system up time


Like all Bartec Benke process analyzers, the rapiDist-4 is designed to provide unmatched reliability and longevity. This is achieved by using only the highest quality components combined with high quality manufacturing under strict quality control. Thanks to the contactless volume measurement without moving parts, the analyzer provides industry leading robustness and system uptime. A fully automated preventive de-coking procedure for flask regeneration significantly reduces required manual maintenance efforts compared to other D86 correlative analysis technologies. Finally, the analyzer is always on and ready to run as no recalibration is required when changing sample composition.


Increased profits with advanced technology


The precise measurement of the IBP and FBP as well as the 5% and 95% recovered volumes with the rapiDist-4 analyzer helps increase profitability. The analyzer significantly helps to improve control of distillation towers and the quality of product blends by optimizing cut points. The rapiDist-4 also prevents product giveaway by continuously measuring online the real distillation curve of final product. With its minimal maintenance requirement combined with low running costs the rapiDist-4 shows unsurpassed low cost of ownership for a maximum return of investment.


Figure 3: Outstanding reproducibility and correlation of the rapiDist-4 with an ASTM D86 compliant laboratory analyzer. Reproducibility limits according to ASTM D86 are marked as dotted lines.


A perfect alternative to Simulated Distillation Online GC


When comparing gas chromatographs (GC) solutions with distillation process analyzers like the rapiDist-4, one has


Application Areas


The rapiDist-4 analyzer is designed for fast process control and perfectly fits into the following applications, along many others:


• Atmospheric distillation tower (CDU) to control the 5% and/or 95% recovered volumes for side cut products, e.g., light naphtha, heavy naphtha, kerosene, diesel and heavy gas oil fractions.


• Catalytic reforming processes to control the naphtha charge stream to prevent reaching excessively high end points (by sending a warning signal to the DCS) in order to keep optimal yields of reformate and increase the lifecycle of catalyst.


• Fractionating tower of hydrocracking processes, which produces light straight run, light naphtha and a distillate stream by controlling the 5% and 95% recovered volumes of each stream.


• Monitoring intermediate product blending at remote terminals to control final products specifications.


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to understand the differences in the analysis technology. The rapiDist-4 is capable of directly measuring the IBP and FBP with high precision, as required by the ASTM D86. GC solutions merely extrapolate the IBP and FBP, which makes this important process parameter more uncertain. To handle changing input composition, especially in blending processes, gas chromatographs require frequent and tedious recalibrations with laboratory samples which adds another error source to the analysis. On the other hand, the rapiDist-4 does not require any recalibration or measurement correction using correlative equations. Overall, the rapiDist-4 analyzer shows significant advantages over GC solutions which makes Bartec Benke’s advanced distillation process analyzer technology clearly the desirable solution.


Author Contact Details Dr. Christian Schmidt, Global Product Manager Bartec Benke • Borsigstrasse 10, 21465 Reinbek, Germany • Email: christian.schmidt@bartec-benke.de, • Web: www.bartec-benke.de


Compact enclosures simplify high temperature process analytical applications


Intertec’s new Hot Box for outdoor process sampling applications can deliver high temperatures up to 150°C/300°F in compact footprints. The new hot boxes employ a combination of conduction and convection heating assisted by a novel air circulation system.


Protective enclosures are usually necessary for analyser applications, and are a major contributor to overall costs. The compact hot boxes make it possible to provide elevated temperature environments for sampling systems in small form factors, This greatly simplifies installations close to the process lines being tested - to minimise sample lag time and substantially reduce the hidden costs of analyser installations such as heated sample lines.


For many instrumentation applications in chemical and petrochemical plants, and especially for analyser sample conditioning systems, it is essential to maintain an elevated temperature in order to prevent condensation or crystallisation of the media and corresponding inaccuracy of results. Complete insulation of measurement and analysis stations is rarely possible due to requirements for maintenance and calibration. Intertec’s easy-access hot boxes provide an efficient heating solution thanks to the way they are constructed, using high-performance insulation sandwiched between sheets of GRP (glassfiber reinforced polyester). All of the materials have low thermal conductivity, and the sandwich construction means that enclosures can be fabricated using bonding techniques, avoiding the ‘thermal short cuts’ between inner and outer shells that metal enclosures and metal fixings create. The overall thermal insulation of a sandwich-construction GRP enclosure is typically more than twice as good as a steel enclosure with the same insulation thickness, and provides a highly stable environment for maintaining elevated temperatures. Among many applications, the hot boxes are helping plant operators to implement the monitoring and analysis required to meet new flare stack combustion rules.


The new hot boxes use electric heaters that have a flat side for conductive heat transfer, and a finned side for efficient heat transfer to the internal atmosphere using convection. The conductive face of the heater is attached to an aluminium plate. The sampling equipment is assembled onto a second detachable plate, which bolts onto the heated plate with the assistance of thermal transfer paste for optimal heat conductivity. The heaters are designed for hazardous area (potentially explosive) applications and employ positive temperature coefficient or PTC cartridges. As their electric resistance increases with rising temperature, the heaters are self limiting, ensuring that the surface temperature will never exceed the maximum temperature of the listed temperature class. Intertec’s electric heating systems meet an exceptional range of hazardous area approvals including IEC, ATEX, CSA/NRTL, EAC, and many other national certificates for countries including China, Brazil and South Korea.


The exact temperature inside the hot box is controlled by Intertec’s explosion proof smart controller, which provides programmable digital PID (proportional-integral-derivative) control. The temperature sensor for the controller can be mounted at the optimum position in the enclosure to ensure accurate control.


As the style of self-limiting heater used reduces heat output as temperature increases, Intertec has designed a novel feature to improve operational performance. A processing plant’s instrument air service can be connected to provide a very low flow, which is introduced into the enclosure via perforated tubing that releases the air between the fins of the heater(s). This air flow continually moves the warmer air away from the heater, which as a result then maintains a higher heat output. With the heating system running at a higher rate, hot temperatures can be achieved both more quickly and very evenly throughout the enclosure’s interior, and measurement cycle times can be reduced. Hot Box enclosures will also support purging if required.


In this way, Intertec can make hot boxes capable of providing certified hazardous area electric heating for temperatures up to 150°C/300°F in small footprints, complete with doors for simple maintenance and operator access. These highly insulated GRP hot boxes can be designed to be completely weather resistant, allowing large savings to be made in the installation and ownership costs of process analysers.


Another major possibility of Intertec’s GRP-based hot boxes is shape optimisation. The construction techniques used for GRP make it simple to create special shapes - further simplifying online analyser and sampling applications located close to the process.


More information online: ilmt.co/PL/n0WL For More Info, email:


email: For More Info, email:


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