Question

process sefaety

a) For process hazard analysis, explain the differences between informal safety review and formal safety review (5 Marks) b) Figure 1 shows a toluene water wash process. The process is to clean water soluble impurities from contaminated toluene. The separation could be achieved using a Podbielniak®, which also called as POD centrifuge, due to a difference in densities. The contaminated toluene, which has light density, is fed to the periphery of the centrifuge and travels to the center. The water, which has heavy density, is fed to the center and travels counter-current to the toluene and to the periphery of the centrifuge. Both phases are mixed within the centrifuge and separated counter-currently. The process is conducted at 190 °F (87.8 °C). The contaminated toluene is fed from a storage tank into the centrifuge. The heavy liquid out (contaminated water) is sent to waste treatrognt and the light liquid out (clean toluene) is collected in a 55-gallon drum. wand -Heat exchanges inatrics Perform a safety review of this process and list down FIVE (5) possible modífications to improve the safety of the process. (20 Marks) DIRTY TOLUENE STORAGE POD CENTRIFUGE WATER CLEAN TOLUENE WATER Figure 1: Toluene wash water process.

Answer 1

@ safety review for process hazard analyses can be classifeed ento two classes informal safety geslew and 10 formal safety. Prvices, Informal safety review is conducted for small, bench-scale or processes. Informal safety reviews laboratory

a new In is done for bringing small change es in the exesting process. Whereas formal safety review is conducted for process or when substantial changes are required in an existing process. case of informal safety reviews, generally reveewer meet in an informal manner, they examine process equipment, operating proced- -ures etc. and give suggestion fox improving the process safety, Whereas in case of formal safety reviews, detalled safety reviews report is face bared, commetter, then gencedes the report and takes necessary actions accordingly. As per HomeworkLib guidelines, only one question can be solved at a time, For more details, please refer to Chegg guidelines.