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【答案】应助回帖
★ ★ ★ ★ ★
感谢参与，应助指数 +1
prince_n: 金币+5, ★★★★★最佳答案 2015-05-23 09:19:15
心静_依然: LS-EPI+1, 感谢应助 2015-05-23 09:21:56
Accession number:
20151400720811
Title: Dissolution kinetics of calcium sulfate dihydrate
Authors: Wang, Zining1; Zhou, Jiabei1; Zhu, Jiahua1 Email author jhzhu@scu.edu.cn; Wu, Hui1; Chen, Changguo1; Liu, Shizhong1
Author affiliation: 1 School of Chemical Engineering, Sichuan University, Chengdu; Sichuan, China
Corresponding author: Zhu, Jiahua
Source title: Huagong Xuebao/CIESC Journal
Abbreviated source title: Huagong Xuebao
Volume: 66
Issue: 3
Issue date: March 1, 2015
Publication year: 2015
Pages: 1001-1006
Language: Chinese
ISSN: 04381157
CODEN: HUKHAI
Document type: Journal article (JA)
Publisher: Chemical Industry Press
Abstract: Dissolution rate of a gypsum (CaSO4·2H2O) sample rotating in pure water was measured by automatically detecting electric conductivity of the solution, in one-second time interval of data acquisition. Superficial shape (7 cm×4 cm×2 cm) and surface area (100 cm2) of the sample were maintained constant basically during measurement. Under surface reaction-controlled dissolution experiment condition, the kinetics model was used for regression of dissolution rate constant (ks) and reaction order (n). The values of ks were 1.91×10-8, 3.46×10-8, 4.92×10-8, 7.07×10-8 mol·cm-2·s-1 respectively for temperatures 25, 45, 65, 85, accommodated by a value of 1.27 for reaction order n. Consequently activation energy of dissolution reaction was correlated 19.07 kJ·mol-1 through the Arrhenius equation. Because of eliminating uncertainty of sample's surface area in dissolution experiment, the results calculated from the kinetics equation with the model parameters regressed in this paper were more consistent with experimental value and closer to theoretical expectation of dissolution rates in literature. ©, 2015, Chemical Industry Press. All right reserved.
Number of references: 22
Main heading: Reaction kinetics
Controlled terms: Activation energy - Calcium - Chemical activation - Data acquisition - Dissolution - Driers (materials) - Enzyme kinetics - Kinetics - Rate constants - Surface reactions
Uncontrolled terms: Arrhenius equation - Calcium sulfate dihydrate - Dissolution kinetics - Dissolution rates - Dissolution reactions - Experiment condition - Experimental values - Kinetics equation
Classification code: 549.2 Alkaline Earth Metals - 723.2 Data Processing and Image Processing - 802.2 Chemical Reactions - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 931 Classical Physics; Quantum Theory; Relativity - 931.3 Atomic and Molecular Physics
DOI: 10.11949/j.issn.0438-1157.20141069
Database: Compendex |
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