English
Русский Removal of harmful gases from the air stream using carbon sorbents based on plant waste of the Republic of the Union of Myanmar
Abstract
Objectives: in this work, we evaluated the ability of the adsorbent of gas-vapor activated carbon obtained from the shells of macadamia nuts of one of the enterprises in Myanmar as an agent of the recovery technology using the example of the extraction of n-butanol vapors from their mixtures with air (AVM).
Methods. The object of the study was pre-dried macadamia nuts, which were crushed, heat treated at 650-700°C for 60 minutes in pyrolysis, followed by water vapor at a temperature rise of 15 °C/min without thermal ex-posure, the specific consumption of water vapor was 5 g per 1 g of the resulting activated carbon. The obtained sorbents were analyzed for the sorption properties of C6H6, CCL4 and H2O vapour. Their total volume was deter-mined, their porous structure was estimated by the volume of pores of various sizes, the absorption of iodine and methylene blue from aqueous solutions. Their ability to remove harmful gases during adsorption of n-butanol at different relative pressures was characterized and their adsorption kinetics and isotherms were studied.
Results. It is shown that the values of the coefficients obtained from the kinetic equation a = A(1-e-B·τ) of the obtained active carbons are preliminarily performed in their pores with butanol. According to the values of A and B, these sorbents are actively absorbed by harmful gases from the vapor-air mixture. For comparison, the article presents the quality indicators of active carbons of the CS (coconut shell) and PS (plum seed) brand made frоm a number of agricultural wastes of Myanmar.
Conclusions. The studies allow us to state quite satisfactory absorption properties of the obtained new activated carbon from the shell of macadamia nuts, in the studied process of extracting n-butanol vapors from their mixtures with air, which indicates the probable competitiveness of this adsorbent in solving the problems of purification from vapors of organic substances of emissions of high concentrations, provided that its production is organized in the conditions of Myanmar.
Methods. The object of the study was pre-dried macadamia nuts, which were crushed, heat treated at 650-700°C for 60 minutes in pyrolysis, followed by water vapor at a temperature rise of 15 °C/min without thermal ex-posure, the specific consumption of water vapor was 5 g per 1 g of the resulting activated carbon. The obtained sorbents were analyzed for the sorption properties of C6H6, CCL4 and H2O vapour. Their total volume was deter-mined, their porous structure was estimated by the volume of pores of various sizes, the absorption of iodine and methylene blue from aqueous solutions. Their ability to remove harmful gases during adsorption of n-butanol at different relative pressures was characterized and their adsorption kinetics and isotherms were studied.
Results. It is shown that the values of the coefficients obtained from the kinetic equation a = A(1-e-B·τ) of the obtained active carbons are preliminarily performed in their pores with butanol. According to the values of A and B, these sorbents are actively absorbed by harmful gases from the vapor-air mixture. For comparison, the article presents the quality indicators of active carbons of the CS (coconut shell) and PS (plum seed) brand made frоm a number of agricultural wastes of Myanmar.
Conclusions. The studies allow us to state quite satisfactory absorption properties of the obtained new activated carbon from the shell of macadamia nuts, in the studied process of extracting n-butanol vapors from their mixtures with air, which indicates the probable competitiveness of this adsorbent in solving the problems of purification from vapors of organic substances of emissions of high concentrations, provided that its production is organized in the conditions of Myanmar.