detecting_benzene_in_refinery_atmospheres

Detecting benzene in refinery atmospheres

Benzene remains an important industrial chemical, but is well known as extremely hazardous and recognised as a carcinogen. Detecting benzene in refinery is important as legislations across the globe has been put in place to ensure exposure of benzene at plants where it is produced is minimised. Modern PID instruments offer the means to monitor benzene concentrations down to 10ppb or better.

6th August 2020

Download Application Article

Benzene is a natural constituent of crude oil. Assuring safety of personnel working on oil refineries generally in the extraction of benzene in particular depends on keeping exposure within tightly specified limits. European law requires that benzene exposure at refineries be reduced as far as is practically possible, with levels no higher than 1ppm averaged over a time weighted average (TWA) eight hour day, or 5ppm for 15 minutes as a short term exposure limit (STEL). This proves how vital detecting benzene in refinery is! Production facilities must monitor pipework, seals and valves, and measure emissions from process equipment. Similar regulations exist in the USA and in fact in most jurisdictions.

One of the aromatic hydrocarbons, benzene is extremely hazardous. The immediate effects of high exposure include headache, dizziness, nausea and tiredness, while long term exposure of excessive levels is a direct cause of leukaemia. As well as being a known carcinogen, benzene is also associated with various blood disorders (such as anaemia) and pre-cancers of the blood. It also attacks the liver, kidneys, lungs, heart and brain, and can cause DNA strand breaks and chromosomal damage. But benzene is also an industrially important chemical, being an intermediate in the manufacture of various plastics, nylon, resins and various pharmaceuticals. As such it is separated from other hydrocarbons as part of the petrochemical refining process in many plants and extracted as raw benzene. Monitoring of benzene is best performed with PID using a three-stage process. The first stage is to monitor concentrations of total aromatic compounds (TACs) using a selective 10.0 eV lamp, with no pre-filtering for benzene. If this TAC value is within the 1ppm limit, then benzene concentrations must therefore be within the 1ppm limit. If the TAC level is higher than the 1ppm limit, then stage two is to filter out the hydrocarbons that would interfere with detection of benzene and then test again. If the level of benzene is below 1ppm, then again all is well. If it is higher, then the final step is to perform a 15 minute STEL test.

detecting_benzene_in_refinery_atmospheres

The Tiger Select from Ion Science is a revolutionary hand-held gas detector with two-mode operation for the rapid detection of benzene and total aromatic compounds. The most sensitive such device available, the Tiger Select is capable of providing both 15 minute STELs and 8 hour TWAs for TACs using its proprietary high output 10.0eV lamp.

With the Tiger Select, a reading is shown for TACs immediately on start-up. Should aromatics be detected, a benzene pre-filter tube can be easily attached for rapid stage-two and stage- three detection and selective measurement of benzene down to concentrations of parts per billion. In addition, the unique MiniPID sensor incorporates both Anti-contamination and Fence Electrode technology for extended operation in difficult working conditions.

History shows us that legal concentration limits for exposure to hazardous chemicals only ever trends downwards.

Download Application ArticleView All Application Articles

For more information on ION Science instruments, please contact us on:

info@ionscience.com

or telephone: +44 (0) 1763 208 503.

Application Article

Everything you need to know about how Personal VOC monitors improve health and safety regimes

Our Application Articles are available to download below, they provide you with key information on the exposure limits and the locations of where potentially harmful gases can occur within your application and share information on the gas detection monitoring techniques and equipment that can help you manage gas detection in the workplace.

Detecting Benzene

Download Application Article

Related Application Articles

Building on a legacy of photoionisation detectors

From the 1970s to the present day, photoionisation detectors (PIDs) have been at the front line of efforts to detect volatile organic compounds.

View Details

Continuous VOC Monitoring

VOCs and other toxic gases can produce major health effects, continuous VOC monitoring will alert nearby workers if harmful concentrations are reached.

View Details

General leakage in fuel storage – VOC detectors

Owners of fuel storage facilities are subject to regulations aimed at preventing leaks of fuel into the environment, increasing the need for VOC detectors.

View Details

Download your copy of the Application Article

Please complete the form below to download the Application Article.