An East coast chemical plant that manufactures phenol, acetone and alphametyl styrene from cumene planned to install an air pollution control system to control the Volatile Organic Compounds (VOCs) emitted during their chemical production process. Phenol is consumed internally as an intermediate chemical while the acetone and alphametyl styrene are sold off. Once the chemicals are produced, they are shipped to another plant to make carpet fibers. This plant already had a carbon recovery system in place, but needed a system to control the low concentration residual process stream from the carbon recovery system.
After thorough vendor evaluation, the plant selected and contracted Anguil Environmental Systems to solve their emission problem. The combination of VOCs in the stream and their low concentration made catalytic oxidation the ideal technical choice. Plant engineers had concerns that an oxidation system might have an adverse effect on the precise pressure and volume control required in their production process. Anguil’s experience and success with chemical process applications provided the plant personnel with the confidence that catalytic oxidation was a viable solution.
An Anguil Model 400 forced draft catalytic oxidizer, rated for 65,000 SCFM (102,512 Nm3/Hr) was selected to process the flow from twenty-five sources of production emissions. As always, Anguil’s engineering staff worked closely with the customer throughout the design and manufacturing processes to ensure that the system precisely met their requirements. The system was sized to provide 99% destruction removal efficiency and 70% thermal energy recovery. The reactor section contains a catalyst bed to oxidize the incoming airflow. The catalyst converts VOCs into carbon dioxide, water vapor and thermal energy.
In order to address the concern of the precise pressure and volume control required for the customer’s production process, Anguil manufactured a four-module, fully welded shell and tube heat exchanger. By using a greater plate thickness, as well as fabricating “ribs” and “dimples” on the plates, a pressure differential of 87.5 w.c. was sustained.
The plant’s process operates 24 hours a day, seven days a week. The oxidation unit is required to run continuously, with 100% up-time to accommodate the aggressive chemical production process.
The Programmable Logic Control (PLC) system was integrated into the customer’s control system and redundancy was designed into the most critical items. A difficult pollution control issue was solved by Anguil, resulting in another satisfied customer.