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Study of Physicochemical Property on Hydrating Processes of Partially Hydrated Magnesium Chloride

Author: XuWanBang
Tutor: ZuoMinXiong
School: Institute of Qinghai Salt Lake
Course: Inorganic Chemistry
Keywords: Low hydrated magnesium chloride Absorbent Thermodynamics Dynamics Exhaust Moisture content Detect
CLC: O611.3
Type: Master's thesis
Year: 2005
Downloads: 126
Quote: 0
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Abstract


Currently bischofite dehydration process in order to provide a theoretical parameters, the papers from the protective atmosphere containing hydrogen chloride catalytic bischofite component detection and protection of the dehydration process exhaust gas recycling departure. After a number of experiments, and explore the various physical and chemical parameters of low hydrated magnesium chloride as raw materials to adsorption exhaust moisture protective gas recycling, provide a theoretical basis for the entire dewatering process. Determination of the content of water and a protective atmosphere of hydrogen chloride gas in an exhaust simple method for the establishment of using phosphorus pentoxide absorption, direct weighing method for measuring the moisture content: the absorption of hydrogen chloride gas with sodium hydroxide solution, titration of chloride ion to detect mercuric nitrate solution content of hydrogen chloride gas. Meanwhile, the introduction of correction factors to eliminate the systematic error, thereby establishing a bischofite dehydration exhaust content detection problem. System under laboratory conditions, the standard low hydrated magnesium chloride samples by of MgCl 2 · 6H 2 O TG-DTG, DTA analysis, preparation of low hydrated of magnesium chloride in a suitable temperature. Chemical titration analysis and Karl Fischer titration analysis to determine the water of crystallization of the sample prepared in the sample taken. The results showed that the sample preparation in line with the pure crystalline phase. By X-ray diffraction analysis of the sample, and further confirmed that the sample for the desired low-hydrated magnesium chloride. Of 3 absorbent process water vapor partial pressure and temperature relationship thermodynamic calculation of phase diagram analysis, a preliminary study of low hydrated magnesium chloride absorption process. Low hydrated magnesium chloride in water absorption process water vapor partial pressure and temperature dependence of thermodynamic calculations, the equilibrium partial pressure of water absorption of water vapor at different temperatures low hydrated magnesium chloride, and provides a theoretical basis for low-hydrated magnesium chloride to absorb moisture from the exhaust. 4 low hydrated magnesium chloride absorbent Damp heat test box control dynamics of temperature and humidity, using X-ray diffraction and chemical analysis combining of low hydrated magnesium chloride water absorption process dynamics. Under different temperature and humidity conditions mM MgCl 2 · 4H 2 O and mM MgCl 2 · 2H 2 O water absorption experiments. Linear fitting of the experimental results and analysis, has been the low hydrated magnesium chloride water absorption kinetic parameters of the reaction rate equation. Apparent pre-exponential factor, activation energy and the apparent reaction order. From the obtained data, the low hydrated magnesium chloride as the adsorbent to adsorb the catalytic protective atmosphere containing hydrogen chloride to the water the bischofite dewatering process exhaust moisture, so that the protective gas in the hydrogen chloride can be recycled,

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Nature
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