Abstract
This article is focused on sol-gel technology of industrial production of composite sorbents «silica gel – sodium sulphate» and «silica gel – sodium acetate», which includes the next stages: preparation of aqueous solution of silicate glass and polymer quaternary ammonium salt (PQAS), formation of nuclei of the silicate phase, formation of silicon-oxygen matrix, drying and fractionation of sorbent. According to the developed technology, sorbents were prepared with a granula size of 3 – 5 mm. Bulk density is stated to be of 0.72 g/cm3 and 0.65 g/cm3 for composites «silica gel – sodium sulphate» and ‘silica gel – sodium acetate’. It is shown that composite sorbents are characterized by high water adsorption at the level of 0.42 – 0.66 g/g. Temperatures of regeneration of composites «silica gel – sodium sulphate» and ‘silica gel – sodium acetate’ are stated to be of 90 °C and 60 °C. Heats of adsorption of composites «silica gel – sodium sulphate» and «silica gel – sodium acetate» are 2200 kJ/kg and 1400 kJ / kg, respectively.
Highlights
Attempts to improve them have beenUrgency of thermal energy storage and focused on the existing sorbents, as well as on the transformation systems based on the sorption synthesis and study of composites Subsequent adsorption leads to complex porous matrix» (SIPM) due to phenomena results from their high density of the increased sorptive capacity to conventional heat energy storage, low heat losses and repeated working fluids [3; 4]
Working γ-Al2O3, vermiculite, activated carbon, attapulgite, fluids used for adsorptive heat energy burnt clay are used as porous matrix, and salts transformation (AHET) are environmentally safe. are lithium bromide and magnesium chloride, AHET exhibits high potential for saving fossil calcium chloride, barium chloride, lithium fuels
Subsequent adsorption leads to complex porous matrix» (SIPM) composites are dissolution and conversion into a salt - sorbate recognized as promising materials for AHET due solution [8]
Summary
Attempts to improve them have beenUrgency of thermal energy storage and focused on the existing sorbents, as well as on the transformation systems based on the sorption synthesis and study of composites SIPM due to phenomena results from their high density of the increased sorptive capacity to conventional heat energy storage, low heat losses and repeated working fluids [3; 4]. Composite sorbents SIPM can to their high sorption capacity for conventional become widespread in low heat storage devices, working liquids (water, methanol and ammonia). Experimental Porous composite materials were obtained by deposition of sodium silicate solution with sulphuric or acetic acid.
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