Evaluation on the Removal Efficiency of Volatile Organic Compounds (VOCs) produced from PCB Solder Mask Process by Wet Scrubber

• Main Authors: Peng-Chan Hsu, 徐鵬展
• Other Authors: Kung-Yuh Chiang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/yvy25b

碩士 === 國立中央大學 === 環境工程研究所在職專班 === 106 === This study aims to investigate the removal efficiency of volatile organic compounds (VOCs) produced from the printed circuit board (PCB) solder mask process using the traditional wet scrubber. The optimum operation conditions of scrubber and emission factor of VOCs in the full scale PCB solder mask manufacturing plant were also discussed. The experimental results indicated that the average removal concentration of VOCs was 8.66 ppm operated at liquid-to-gas (L/S) ratio 1.25 and pH ranged from 8.0 to 9.0. Meanwhile, the removal efficiency of VOCs was approximately from 34% to 43%. The average VOC removal concentration was increased from 11.39 ppm to 16.0 ppm with an increase in L/S ratio from 1.45 to 1.66. It could conclude that the increasing in L/S ratio could enhance removal efficiency of VOCs during PCB solder mask process. The average increment in VOCs removal efficiency was 9% to 13% with an increment of 50 L/min in water spray amounts. In the case of L/S ratio of 1.66, emission factors of VOCs conducted in this research were 0.0019 kg/m2(pH ranged from 6.0 to 7.0), 0.0024 kg/m2 (pH ranged from 7.0 to 8.0), and 0.0016 kg/m2 (pH ranged from 8.0 to 9.0), respectively. The lowest emission factor of VOCs occurred at pH range between 8.0 and 9.0. All emission factors of VOCs were done in this research could comply with the VOCs emission requirement (0.026 kg/m2) of the Environmental Protection Administration (EPA).. Based on the experimental results of this research, the optimum operation conditions for tested PCB solder mask manufacturing process were including the range of pH 8.0 to 9.0, L/S ratio of 1.66, and washing water circulation of 5.12 L/min. It implied that the washing water for applying wet scrubber should be changed to fresh washing water when the scrubber operated continuously 2.7 hours (162 mins). In summary, the preliminary results obtained from this study could provide the good information for operation conditions of wet scrubber, but also could provide the good operation experiences for relevant operators in the future work.