Definition of Dehydration. In chemistry, a dehydration reaction is a chemical reaction that involves the loss of a water molecule from the reactant. Note that the word reactant is singular: we're talking about one molecule of reactant losing one molecule of water. There's another type of reaction, called a condensation reaction,...
Thermal behaviour and kinetics of dehydration of gypsum in air have been investigated using in situ realtime laboratory parallelbeam Xray powder diffraction data evaluated by the Rietveld method. Thermal expansion has been analysed from 298 to 373 K.
Dehydration synthesis is classified as a type of chemical reaction. A chemical reaction is the process where chemical substances called reactants transform into new substances called products. But a dehydration synthesis also has a different alias it can go by; this is a condensation reaction.
kinetic parameters that are needed to predict dehydration and thermal degradation of gypsum board using a set of Arrhenius equations. Specimens of a Type C board were tested in a TGA apparatus in nitrogen at four heating rates; 5, 10, 20 and 60 °C/min. A more conventional approach was used instead of .
Introduction. Rozanov (1961) and Kurmangaliyev (1966b), who studied the gypsiferous soils of the Soviet Union, state that the physical and physicochemical properties of gypsiferous soils are closely related to those of nongypsiferous soils when the soils are developed under similar soil forming factors, and the gypsic layer is deep in the profile.
Some deposits of gypsum are found close to the surface of the earth; others well below the surface. Gypsum has been recognised as a valuable building material for several thousand years. Gypsum is a hydrous calcium sulfate with the chemical formula (CaSO. 4 (2H. 2. O), which means that it is a compound of lime, sulfur, and water. CaSO. 4 79,1% ...
The governing equations are integrated numerically using the finite element method. The obtained results show a significant correlation between gypsum dehydration and creation of fluid pathways. The proposed model can be generalised to describe the effects of dehydration in other minerals carrying water in their crystal structures.
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gypsumbassaniteanhydrite. Their industrial applications are based on the reversibility of the dehydrationre hydration reactions of gypsum: it is partially or totally dehydrated by heating (Equations (1) and (2)) but when it is rehydrated, sets and yields hardened products. Mixtures of phases in the CaSO 4∙H 2O system are commonly
Feb 22, 2013· CTLGroup – Lab Service – ASTM C 471 Chemical Analysis of Gypsum . ASTM C 471 Chemical Analysis of Gypsum and Gypsum Products (Section 14 Acid Soluble SO3) Lab ID 763. Use To determine the sulfate content in gypsum and gypsum . »More detailed
a) Confirm the formula of a hydrate with known formula. b) Second, find the formula of a hydrate in which the salt formula is known but not the molar amount of water. INTRODUCTION. Some chemical compounds, especially inorganic salts, incorporate water into their crystalline structures.
Jan 07, 2003· The dried, fineground gypsum can be referred to as "land plaster." The land plaster is used as feed in calcination processes for conversion to stucco. The calcination (or dehydration) step in the manufacture of stucco is performed by heating the land plaster to liberate a portion of the chemically bound water molecules.
The name 'selenite' is mostly synonymous with gypsum but has been used historically to describe the transparent variety, as opposed to satin spar gypsum for the fibrous variety and alabaster for the finegrained massive form.
Gypsum. Gypsum plaster is a white cementing material made by partial or complete dehydration of the mineral gypsum, commonly with special retarders or hardeners added. Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum with water.
The dehydration process of gypsum rock was studied under concentrated solar energy by using a Fresnel lens with power density of 260 Wcm2. Temperatures higher than 700。C were attained for 1 min of solar exposure. The effect of grain size of sample and radiation exposure time on the formation of bassanite and anhydrite was studied by XRD.
Closedform equations are derived for the volume fraction of the unreacted binder (the considered calcium sulfate), unreacted water, chemical shrinkage and hydration product (gypsum).
85% phosphoric acid, H3PO4 (or conc. There are four basic types of chemical reactions in organic chemistry: combination, elimination, substitution, and rearrangement. The dehydration of alcohols to give alkenes is an important transformation and is an example of elimination reaction.
process, known as "dehydration" or "calcination" of gypsum, takes place between 100 oC and 250C and requires the absorption of a large quantity of heat. Heat transfer through the gypsum is practically delayed until the calcination process is completed. The dissociation of .
to Dehydration of Gypsum Plasterboards Exposed to Fire ... equation, for the optimal set of parameters minimizing objective functions . Numerical simulations illustrate several numerical optimization methods, examples, and realistic cases, in which several interesting phenomena are observed. ... Its chemical formula is CaSO 4 H 2 O ...