Treatment of ethylene spent caustic pollutant using sulfuric acid PDFALI FARZI, SAEID MOSLEMI BAYRAMICaustic soda is used in naphtha cracking units and petroleum refineries for sweetening of hydrocarbon streams. The generated caustic waste is an environmental pollutant and must be removed. Several methods are proposed for treatment of spent caustic such as wet air oxidation, biological treatment, etc. Spent caustic used in this work is prepared from Tabriz Petrochemical Company. In this work sulfuric acid was used for treatment of spent caustic which not only removes the waste, but also generates valuable product of sodium sulfate. In each experiment, 1L of spent caustic was taken and its color and phenol were removed by oxidization with H2O2. Then, 50 mL sulfuric acid was added and treatment process was performed. Different samples were taken at specified time periods to calculate percent waste conversion. The results showed that after 2.5 minutes it was about 79%, 84% and 92% at 25, 35 and 45C, respectively.
F&DT Analysis of an Aircraft Wing PDFTejaswini Borra, Ganesh Kumar PamarthiThis paper focuses on estimation of fatigue life of a fastener and crack growth analysis of an aircraft wing of GARUDA - 101. There is no much literature and tools to avoid fatigue damage and failures. Life of the joints, components, and whole aircraft should be estimated to reduce the structural failures due to fatigue. Life after crack initiation should also be estimated.
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