I D
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chementator Briefs
Ultrathin membrane Researchers led by professors Hideto Matsuyama and Tomohisa…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEEQUIPMENT & SERVICESFOCUS
Focus on Sensors
Wireless transmitters save on level sensor installation Reduce the cost…
NEW PRODUCTS + Show More SHOW PREVIEWS

Comment

Reducing emissions from the manufacturing of carbon fibers

By Tetsuo Satoh |

Carbon fibers are typically fabricated by the oxidation of a polymeric fiber, such as polyacrylonitrile (PAN) at 200–300°C, which generates a large amount of exhaust air containing several hundred parts per million (ppm) of hydrogen cyanide and ammonia. This is followed by a carbonization process at 1,000–1,200°C, which takes place under an inert atmosphere, such as N2. The second step generates a smaller amount of exhaust N2, but with high concentrations of HCN and NH3. Conventional treatment systems are unable to handle both the destruction of HCN and NH3 emissions while suppressing the generation of oxides of nitrogen (NOx). To solve this problem, Taiyo Nippon Sanso Ltd. (Tokyo, Japan; www.tn-sanso.co.jp) has developed a system called Innova-Flash, which uses a two-step oxidation process to treat both exhaust streams. In the first step, the highly concentrated HCN/NH3-laden N2 undergoes a high-temperature treatment under reductive conditions. In the second step, a low-temperature oxidation process removes the low concentration of HCN and NH3 in the air exhaust. By injecting the combustion gas (which also contains fuel components) generated in the first step into the second step, energy savings of approximately 50% are achieved,…
Related Content
Focus on Air Pollution Control
These ceramic filters have catalysts built-in The BisCat filter system (photo) combines the three process stages of de-dusting, separation of…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Improving chemical production processes with IIoT and AI technologies
New filtration technology for highly corrosive media
PTA production: Lowering OPEX without compromising on quality
Sure that zero means zero in your zero-liquid discharge (ZLD) process?
How separation processes profit from Industrial Internet of Things (IIoT) solutions

View More

Live chat by BoldChat