2 edition of Soluble anhydrite as a desiccating agent found in the catalog.
Soluble anhydrite as a desiccating agent
William Archie Hammond
Written in English
|Statement||by William Archie Hammond|
|The Physical Object|
|Pagination||viii, 134 leaves :|
|Number of Pages||134|
Aqueous solutions deposit crystals containing 2, 4 or 6 molecules of water. Anhydrous calcium chloride, prepared by heating the hydrate to ° (preferably in a current of hydrochloric acid gas, which prevents the formation of any oxychloride), is very hygroscopic, and is used as a desiccating agent. Soluble anhydrite. Gamma anhydrite (CaSO 4 nH 2 O where n = 0 to ) Natural anhydrite. To get a more complete and integrated understanding of how cement is made, do have a look at the Understanding Cement book or ebook. This easy-to-read and concise book also contains much more detail on concrete chemistry and deleterious processes in.
(b) Desiccating agents are used to absorb moisture. Anhydrous calcium chloride (CaCl 2) is used as a desiccator because it has the capacity of absorbing moisture as it is hygroscopic in nature. 8. State whether a sample of each of the following would increase or decrease in mass if exposed to air. (a) Solid NaOH (b) Solid CaCl 2. White, odorless crystals whose mineral form is called Anhydrite. Anhydrous calcium sulfate is ground to form a colorless, inert pigment which is often used as a paper filler. It is strongly hygroscopic and is also used as a drying agent for solids, organic liquids, and gases. Anhydrous calcium sulfate is commercially sold under the name of.
The self-desiccating hydraulic compositions of the present invention are achieved with the use of an inorganic flow control agent, which facilitates material workability and flow properties in material fresh state. (primarily hemihydrate, dihydrate and anhydrite) are useful. The most soluble form of calcium sulfate is the hemihydrate. A process is described for the formation of fibrous soluble calcium sulfate anhydrite, the fibers thereof having specified dimensions. In the process an aqueous suspension of gypsum is first formed and converted to the fibrous soluble anhydrite by reaction in the presence of saturated steam at °C to °C for up to hours.
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Short Total Synthesis of 8,Di-O-methylbergenin; Accurate Induction Energies for Small Organic Molecules. Development and Testing of Distributed Polarizability Models against SAPT(DFT) EnergiesCited by: 5.
Thus, H 2 O-rich fluids, even if saturated with anhydrite, appear to be inefficient sulfur transfer agents, except perhaps in near-surface environments of high permeability.
A similar solubility problem arises in the origin of carbonated shear zones of regional extent, as in the South Tien Shan, Tajikistan (Baratov et al., ).Cited by: Although gypsum, bassanite, and anhydrite are common mineral names, terminology used for Ca-sulfate phases can be complex, particularly in the use of “soluble anhydrite,” “γ-anhydrite,” or “anhydrite III” (e.g., Bezou et al.
; Carbone et al. ; Seufert et al. ) for dehydrated channel structures more similar to bassanite Cited by: soluble anhydrite löslicher Anhydrit m, Halbhydrit.
Use: Anhydrous: Insol anhydrite is used in cement formulations and as a paper filler. Soluble anhydride, because of its strong tendency to absorb moisture, is useful as a drying agent for solids, organic liquids and gases; the desiccant used in laboratory and industry is known under the name material can be regenerated repeatedly and reused without noticeable decrease in its.
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Chemical analysis evidences no difference i composition between the soluble and insoluble anhydrite modifications. The reactivity of th two compounds, as their name already indicates is quite different; Soluble anhydrite is a strong desiccating agent and in contact, with water i hydrates easily and quickly.
with anhydrite, appear to be inefficient sulfur transfer agents, except perhaps in near-surface environments of high permeability. A similar solubility problem arises in the origin of carbonated shear zones of regional extent, as in the South Tien Shan, Tajikistan (Baratov et al., ).
Middle- to high-grade alteration zones have replaced. At 20°C and 1 atm, the solubility of CaCO 3 is g L −1, but the solubility of the CaO is g L − 1 (Plummer and Busenberg, ;Sullivan et al., ;Baltakys and Prichockiene, ).
Desiccants are drying agents that extract water from a wide range of materials. They are either soluble or insoluble substances that adsorb water due to their chemical properties.
Examples include silica gel, bauxite, calcium sulfate and montmorillonite clay. Soluble agents include calcium chloride and glycerol. Anhydrite, or anhydrous calcium sulfate, is a mineral with the chemical formula CaSO is in the orthorhombic crystal system, with three directions of perfect cleavage parallel to the three planes of is not isomorphous with the orthorhombic barium and strontium sulfates, as might be expected from the chemical ctly developed crystals are somewhat rare, the mineral.
agent for holding the uranyl ion in solution. Whether or not it plays a significant role:in maintaining the solubility of uranium in.
desiccating basins is a moot question. It is probable that the concentration of. At room temperature, insoluble anhydrite dissolves very slowly to the extent of g per g of water and does not absorb moisture from the air.
SOLUBLE ANHYDRITE, which is obtained by heating calcium sulfate dihydrate at a temperature below °C, has a. What are drying or desiccating agents. Give examples. Solution: Drying or desiccating agents are those who readily absorbs moisture from other substances without altering their chemical nature.
Ex: Conc. Sulphuric acid, alumina- Al 2 O 3, phosphorus pentoxide P 2 O 5. Complete the following table. Full text of "Holderbank Cement engineering book" See other formats "Hoiderbank" Cement Seminar Process Technology I - Cement Grinding Systems Cement Grinding Systems K. Breitschmid VA 93/ 4/E (Revised Version 02/98) 1.
Kevin A. Paine, in Lea's Chemistry of Cement and Concrete (Fifth Edition), Effect of Sulfate Content. Different types of false set have been identified, 32 associated with the dehydration of added gypsum during grinding to give hemihydrate or soluble anhydrite.
On hydration this precipitates secondary gypsum and results in premature stiffening of the paste. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons. Answer: Sulphuric acid (cone.) acts as drying agent when it removes water from other substances i.e.
for drying gases. Cone, sulphuric acid acts as dehydrating agent when it removes chemically combined water from compounds due to it strong affinity for water.
Anhydrite is an important constituent of white, usually marginal, zones of amygdules residing within the slag sample LdS15 (Figure C and D).However, it is also found in the blue, apatite-group-bearing internal zones.
An analytical report for anhydrite is given in Table A unique feature of this anhydrite is the molybdenum admixture, which would likely act due to small substitution. A water-soluble solid disappears in a solution where the solvent is water, and water has the property of being clear and transparent.
So, the solution is also clear and transparent. Lakes and rivers do not freeze suddenly in winters because of the high specific latent heat of solidification, i.e.
the amount of heat released when 1 g of water. The effect of calcium sulphate presented as soluble anhydrite (γ -CaSO4) on the setting of gypsum plasters was investigated by measurement of the set strength and a microstructural examination of the set plasters. The anhydrite reduced the set strength by disrupting the interlocking crystal matrix of dihydrate needles.
Additives, such as the nucleating agent calcium sulphate. Re: Insoluble Anhydrite. It will have no affect on strength of cement mortar. The solubility of the sulphate in the cement will be changed and that might require that the amount of sulphate addition needs to be adjusted in order to optimise the workability and water demand.BureauojStandardsJournalofResearch [Vol.n Constanttemperaturewasmaintainedbytheuseoftwowatt bulbs,abimetallicthermoregulatoryanelectricfanandastorage battery.Acetic anhydride is an esterification agent for use in prepn.
of modified food starch and for acetylation of monoglycerides Acetic anhydride is a versatile reagent for acetylations, the introduction of acetyl groups to organic substrates.
In these conversions, acetic anhydride is viewed as a source of CH 3 CO +.Alcohols and amines are readily acetylated.