Date of Award
Master of Science (MS)
Dr. Sayed Marzouk
Dr. Nayef Mohamed Ghasem
Dr. Mohammad Abu Haija
A novel detection scheme for the hydrogen sulfide (H₂S) was described and patented recently by researchers at UAE University. This detection scheme and the described bench-scale analyzer offered the advantage of low-cost solution for real-time monitoring of percentile levels of H₂S with excellent signal stability. However, this previous work suffered from two major limitations, which are the relatively low sensitivity and slow response time, which mainly hindered its commercial utilization. Therefore, the aims of the present work were to enhance the detection sensitivity, decrease the response time, and develop a portable prototype of the H₂S analyzer based on the improved calorimetric detector. The calorimetric detection scheme was substantially improved by replacing the diffusion scrubber, reported previously, with a direct mixing of the H₂S containing gas stream with the sodium hydrogen and hydrogen peroxide reagents. Also, the heavy stainless steel mixing block was replaced with a carefully designed light-weight stainless steel alternative. The improved detector, two reagent pumps, two reservoirs, thermocouples-data acquisition card, compact PC and lithium ion battery were the main component used to construct a portable H₂S analyzer. The analyzer was optimized and fully characterized. The presented analyzer succeeded to lower the previously reported response time (i.e., 7 min) to 70 sec. and also the limit of detection was decreased from 200 ppm to 20 ppm. Additional advantages of the presented analyzer compared to the previous report include:
(i) portable version with gross weight of approx. 8 kg; (ii) stand-alone operation for up to 4 hours at least, (iii) lower reagent consumption, (iv) single waste stream instead of two, (v) lower in cost (i.e., 2000 USD) compared with commercialized H₂S gas analyzer based on UV absorption detection (i.e., 23000 USD), (vi) ability to measure H₂S in liquid samples within 31 sec and with a LOD at 1 ppm, and (vii) capability to monitor the removal efficiency of H₂S from gas stream.Also, the reported advantages did not compromise the previously reported advantages such as the impressive signal stability or the low cost to any extent.
Abu Hattab, Bashar Yousef, "DEVELOPMENT AND CHARACTERIZATION OF A PORTABLE APPARATUS FOR CONTINUOUS MEASUREMENT OF HYDROGEN SULFIDE IN GAS STREAMS" (2018). Chemistry Theses. 14.