BACKGROUND: Oxidative absorption of hydrogen sulfide into a solution of ferric chelates is studied in a stirred cell glass reactor. The experiments were performed to investigate the degradation of chelates sodium salt of nitrilotriacetic acid (NTA) (Merck), ethylenediaminetetraacetic acid diadisodium salt (EDTA) and diethylenetriaminepentaacetic acid (DTPA) at 313 K, pH 6, iron concentration 10 000 g L −1 and Fe : chelate molar ratio 1 : 2. RESULTS: Oxidative absorption of hydrogen sulfide into a solution of Fe-NTA was found to be more successful, therefore, further experiments with 10%, 50% and 100% concentrations of hydrogen sulfide were performed. It was shown that this process is applicable for removal of low and high concentrations of hydrogen sulfide. The effect of antioxidants using sodium thiosulfate was also studied in order to minimize degradation of NTA. The kinetics were studied and it was observed that the reaction appeared to be first order in ferric chelate with rate constants for 100, 50 and 10% hydrogen sulfide concentration: 0.035, 0.013 and 0.019 h −1 , respectively.
CONCLUSIONS: Gas sweetening processes have commercial importance in natural gases, refinery of gases and biogas processing.Desulphurization and cleaning (i.e. removal of H 2 S and CO 2 ) of petroleum gas and biogas is important to make the gas methane rich and to increase the calorific value of fuel. The same techniques of desulphurization and cleaning can be used for treating natural gas or petroleum gas. The desulphurization and cleaning processes can minimize the atmospheric emission of gases like SOx, NOx and CO. As the iron chelate based process is based on the principle of redox reaction of metal chelate with hydrogen sulfide, this method is very useful for desulphurization of petroleum gas and biogas. This work studied the effective use of Fe-NTA solution for removal of high to low concentrations of H 2 S as found in biogas and industrial waste gases.1. Charging the Fe 3+ NTA solution, of known volume and initial NTA concentration. 2. Liquid heating to a temperature of 313 K. 3. Producing hydrogen sulfide gas in Keep's apparatus by the reaction of ferrous sulfide sticks and sulfuric acid.
Pyrolysis is thermal treatment of solid waste in the absence of an oxidizing agent (in inert atmosphere) which generally yields three products namely pyrolysis-oil (liquid), char (solid residue) and gas. The products obtained in pyrolysis can be further used as energy source. Rice husk and saw dust are considered as solid wastes in this study. The effect of temperature and pressure on pyrolysis was studied in a fixed bed reactor. The experimental runs were performed in nitrogen atmosphere. The temperature was varied from 300°C to 500°C, while the operational pressure was fixed at 4 bar, 7 bar and 10 bar. The products such as solid char, liquid pyrolysis oil and syngas were obtained. The solid char was characterized by CHNS analysis, while the pyrolysis oil was characterized by FTIR analysis,
This study deals with production of pulp and paper from waste banana pseudo stem and comparison with recycled pulp used for paper making. Banana pseudo stem was collected from local market of Nagpur and pulped at 120˚C and atmospheric pressure. The pulp was reacted with peroxide to obtain bleached pulp by keeping in a thermostatically controlled water bath. The kappa number after bleaching was observed as 20.43 respectively. Beating of pulp was done in standard lab beater. Sheets were prepared by using pulp in different blending ratios. Burst factor for sheet prepared from virgin banana stem was observed as 30.04, higher than the sheet prepared from recycled pulp which showed burst factor of 18.84. Blending of banana pulp with recycled pulp (50%:50%) showed burst factor of 40.57, which was quite impressive.
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