Archives :: Chementator :: Air-Pollution Control

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September 1, 2014
The first commercial contract delivery was recently made for an emissions control product that removes mercury from fluegas without the use of activated carbon. The product, known as AS-HgX, is made by Novinda Corp. (Denver, Colo.;, and will be used in the utility power-generation industry to help users meet limits on mercury emissions. The product is a departure from the use of activated...
March 1, 2014
The chemical process industries (CPI) are, by their very nature, global in scope. While chemical process operators share many common aspects (in terms of the use of chemical engineering unit operations), the location of their operation brings about different requirements when it comes to managing gaseous and particulate pollutants, because different countries have different regulations with regard to air...
January 1, 2014
Offgases containing compounds of chlorine or fluorine are typically burned to enable the recovery of HCl or HF and prevent release into the environment. However, conventional combustion chambers require a long time to heat up, and thus are typically run continuously to prevent...
July 1, 2013
NEDO  and Hitachi Ltd. (Tokyo, have developed a new combustion technology that could reduce the emissions of oxides of nitrogen (NOx) to below 10 ppm without the addition of diluents. As part of the CCS-IGCC project (carbon capture and storage — integrated coal gasification, combined cycle)...
July 1, 2013
To comply with increasingly stringent regulations for NOx emissions, operators of industrial plants often turn to low-NOx burners to avoid much more costly post-combustion treatment approaches like selective catalytic reduction (SCR). But low-NOx burners are plagued by significant losses in efficiency and process throughput. ClearSign Combustion Corp. (Seattle, Wash.; has developed...
June 1, 2013
Selecting air-pollution control equipment can be tricky. It’s not only difficult to determine which pollutants must be controlled, but also which type of equipment will best control them to required levels for any given process or facility because there is no “one-size-fits-all” solution. Technologies that successfully control pollutants in one facility may not work as well in another...
May 1, 2013
The first commercial application of a newly developed process for the treatment of oxides of nitrogen (NOx) waste gas has been established at a milling operation in Los Angeles, Calif. Developed by Pacific Rim Design and Development (PRDD; Reno, Nev.;, along with DuPont (Wilmington, Del.;, the process uses gas-phase chlorine dioxide to react with both NO and NO2 to form nitric and...
June 1, 2012
A new process for removing oxides of nitrogen (NOx) from industrial foul-air and cool combustion exhaust uses ClO2 in a unique way to remove over 99% of both NO and NO2 with a single scrubbing stage. The reaction vessel is considerably smaller than those required by conventional wet-chemistry NOx removal processes, and according to the technology’s developer, Pacific Rim Design and Development (PRDD...
August 1, 2011
Almost by definition, chemical engineering is a “green” discipline today, as it so often involves efforts to optimize chemical processes in order to reduce the amount of energy and raw materials that are used and the amount of waste that is generated. Today everybody “talks green” but in a lot of cases engineers are the most qualified people to provide the tools required to make...
July 1, 2011
Sulfur dioxide emissions from metals smelters and other process plants are typically treated by converting the SO2 to sulfuric acid, but this may not be convenient, because of the shipping cost for plants located far from an acid market. WorleyParsons (Monrovia, Calif.; offers a solution to this problem with a process that converts SO2 to elemental sulfur, which is easier and safer...
June 1, 2011
A system that utilizes existing biological wastewater-treatment facilities for destruction of biodegradable volatile organic compounds (VOCs) and other organic hazardous air pollutants (HAPs) has been demonstrated at three U.S. petroleum-refining and chemical facilities, and the developer has plans to extend the U.S. patent-pending treatment approach to eight additional facilities in coming months. Environ...
March 1, 2011
Improvements in the design of ethylene oxide (EtO) scrubbers made by The Clean Air Group, Croll Reynolds Co. (Parsippany, N.J.; have helped users meet increasingly stringent regulations for EtO emissions, as well as meet tower height restrictions. “Our designs have achieved efficiencies of 99.99% or greater for removal of ethylene oxide, compared to 99–99.9% with alternative...

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