Abstract Dynamic vapor sorption equipment (AQUADVS) was used to determine adsorption and desorption isotherms for powder rich in fiber (PRF) produced from Palm Date flesh of Sifri cultivar (Phoenix dactylifera L ) at temperatures 25 35 and 45 C in a wide range of water activity (0 09–0 87) Equilibrium was achieved within 29 and 25 h for the adsorption and desorption process 2019-12-12The effect of moisture on the adsorption isotherms and adsorption capacities of CO2 on Argonne Premium coals has been investigated In some experiments a small hysteresis was observed between the adsorption and desorption isotherms The hysteresis was absent or negligible for high-rank and as-received coals but was discernible for lower rank and dried coals

Experimental Determination of Moisture Sorption

2016-9-9The knowledge of moisture sorption isotherms data is important for all aspects related with food technology in the prediction of microbiological enzymatic and chemical stability selecting of packing materials design of drying and concentration processes and choosing adequate storage conditions [1] Meanwhile the moisture sorption isotherms

2019-5-25Isotherm hysteresis and pore-blocking effects of trapped molecules on adsorption dynamics is studied here using the iodine−carbon system in the 300−343 K temperature range It is found that a portion of the iodine is strongly adsorbed and does not desorb even over very long time scales while the remainder adsorbs reversibly as a homogeneous monolayer with a Langmuirian isotherm in

A confined solar drying method is a better option but the energy source is limited to the day's solar energy Solar adsorption drying is an opportunity to dry day and night in an efficient and product conserving manner with a reduced drying cycle Prior to this thesis work several aspects were insufficiently known to really judge the potential

2019-2-22Isotherms can be divided into two categories adsorption and desorption The former is important in storage and the later for drying (Rojanakorn 2004) The desorption isotherm determines the lowest attainable or final moisture content to which a food material can be dried at a particular drying temperature and relative humidity (Rojanakorn 2004)

Adsorption isotherms The powder prepared by treating with combination of 1 5 % TP and 2 5 % MD was found to be the best and was used for adsorption isotherms Procedure adopted by Iglesias and Chirife ( 1982 ) was followed for adsorption isotherms of bael powder at 20 30 and 40 C

Polymers

Methylsilsesquioxane (MSQ) aerogels with uniform mesopores were facilely prepared via a sol–gel process followed by microwave drying with methyltrimethoxysilane (MTMS) as a precursor hydrochloric acid (HCl) as a catalyst water and methanol as solvents hexadecyltrimethylammonium chloride (CTAC) as a surfactant and template and propylene oxide (PO) as a gelation agent

Effect of successive adsorption-desorption cycles and drying temperature on hygroscopic equilibrium of canola W H YangandS Cenkowski Moisture sorp tion isotherms ofboth ambient-air dried (25C) and heated-air dried (50C) canola Brassica napus L 'Westar' were measured up to the fifth adsorption-desorption cycle at the equilibration temperatures of 3 5 25 and 40C

2008-11-1Moisture adsorption isotherms for freeze-dried Inonotus mushroom powders at selected temperature ( 20 C 35 C Δ 50 C) Download : Download full-size image Fig 2 Moisture adsorption isotherms for Inonotus mushroom powders dried at 20 C depending on drying method ( freeze drying vacuum drying Δ hot-air drying)

2019-2-22Isotherms can be divided into two categories adsorption and desorption The former is important in storage and the later for drying (Rojanakorn 2004) The desorption isotherm determines the lowest attainable or final moisture content to which a food material can be dried at a particular drying temperature and relative humidity (Rojanakorn 2004)

2016-6-30The objective of this paper is to determine the isotherms of adsorption and desorption isotherms and the drying kinetics of Myrtus Communis Moisture equilibrium data were determined by using the gravimetric method with water activity ranging from 5% to 95% and three temperatures of 30 40 and 50C Five mathematical models were used to fit

In particular the causes for hysteresis between adsorption and desorption were described Not only the capillary effect between condensation and evaporation in the pores but also the chemical water uptake the drying method and the chemical aging have to be considered to explain the significant hysteresis

Methylsilsesquioxane (MSQ) aerogels with uniform mesopores were facilely prepared via a sol–gel process followed by microwave drying with methyltrimethoxysilane (MTMS) as a precursor hydrochloric acid (HCl) as a catalyst water and methanol as solvents hexadecyltrimethylammonium chloride (CTAC) as a surfactant and template and propylene oxide (PO) as a gelation agent

2019-2-22The drying temperature was varied (50 60 and 70C) to determine the effect of temperature on physico-chemical properties powder properties and sorption characteristics of pumpkin powders The results showed that a drying temperature of 70C removes moisture from pumpkin slices faster than the lower drying temperatures of 50 and 60C

Influence of the age and drying process on pore

In particular the causes for hysteresis between adsorption and desorption were described Not only the capillary effect between condensation and evaporation in the pores but also the chemical water uptake the drying method and the chemical aging have to be considered to explain the significant hysteresis

For both temperatures the effect of the drying method on the isotherms behavior was the same The spray dryer provides a dry product with higher adsorption capacity than that of the other methods The vibro-fluidized bed drying showed higher adsorption capacity than that of vacuum and freeze drying

2018-12-11Abstract - This paper deals with sorption isotherms and drying kinetics of mint leaves (M pulegium) The sorption isotherms have been determined using a static gravimetric method and then fitted by GAB equation at 30 40 and 50 C over a range of relative humidity from 0 05 to 0 9 Experimental data for the drying of mint was obtained at four

2018-8-1538 Adsorption isotherms of chicory inulin powder: temperature effect Nogueira et al Revista Brasileira de Produtos Agroindustriais Campina Grande v 9 n 1 p 37-44 2007 INTRODUCTION The Cichorium intybus L is a seasonal food material native of Europe west and

Isotherms of Nitrogen at 77 K CO 2 at 273 K and H 2 at 77 K were measured on a zeolite 4A In comparison to hydrogen at 77 K or CO 2 at higher temperature Nitrogen shows almost no adsorption at 77 K This example shows that Nitrogen measurements at 77 K are not the appropriate method to analyze micropores smaller than 0 5 nm

2011-2-8Mint leaves were dried by three different types of dryers namely tray freeze and distributed (indirect)-type solar dryer Sorption isotherms of fresh solar tray and freeze dried mint were determined at temperatures of 15 C 25 C and 35 C over a range of relative humidities (10–90%) The effect of drying method on the water sorption isotherms of dried mint samples was evaluated

Ritika Puri Kaushik Khamrui Effect of Temperature on Sorption Isotherms and Thermodynamics of Intermediate Moisture Category Indian Milk Product Cham‐cham Journal of Food Processing and Preservation 10 1111/jfpp 12680 40 5 (999-1009) (2015)

2 1 2 Determination of equilibrium adsorption isotherms The adsorption isotherm of water vapor on the adsorption unit was determined by dynamic adsorption method and verified by gravimetric method The activated carbon is continuously supplied with clean air at a set temperature and relative humidity