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Rate equation of antisynergic extraction of cadmium with D2EHDTPA-TOA
Alternative TitleActa Phys.-Chim. Sin.
Zhang, DL; Lu, LZ; Ke, JJ
2004-03-01
Source PublicationACTA PHYSICO-CHIMICA SINICA
ISSN1000-6818
Volume20Issue:3Pages:275-279
AbstractThe kinetics of antisynergic extraction of cadmium with D2EHDTPA (di-(2-ethylhexyl)-dithiophosphoric acid)-TOA(trioctylamine) under the condition of interfacial reaction controlling model was investigated by using an improved constant interfacial area stirred cell. The extraction course was composed of several interphase transfer processes (transfer between bulk phase and interfacial phase (or boundary phase)) and several chemical reactions. The extraction rate equation was: r = 1.42 x 10(-7)[Cd2+](0.42)[BHA](O)(0.47)/[B](O)(0.85)[H+](0.21) (mol . m(-2) . s(-1)) The interfacial concentration was associated with the bulk concentration by using Freundlich adsorption equation. The concentration exponents in the extraction rate equation were decided by the two factors of the interfacial chemical reactions and the interphase transfer processes. The physical meaning of the fractional reaction order in the rate equation was analyzed. The bigger the Freundlich power n of a reactant, the more the repulsion exerted by the interfacial layer. The apparent extraction activation energy E = 44.2 kJ . mol(-1), the extraction enthalpy DeltaH = 72.9 kJ . mol(-1). The inconsistency in extraction mechanism due to different interface models was also discussed.; The kinetics of antisynergic extraction of cadmium with D2EHDTPA (di-(2-ethylhexyl)-dithiophosphoric acid)-TOA(trioctylamine) under the condition of interfacial reaction controlling model was investigated by using an improved constant interfacial area stirred cell. The extraction course was composed of several interphase transfer processes (transfer between bulk phase and interfacial phase (or boundary phase)) and several chemical reactions. The extraction rate equation was:
KeywordRate Equation Dynamics Interphase Transfer Thio-substituted Organophosphoric Acid Antisynergic Extraction
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3866/PKU.WHXB20040312
URL查看原文
Indexed BySCI
Language英语
WOS KeywordKINETICS
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000220362600012
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Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5006
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
2.Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China
Recommended Citation
GB/T 7714
Zhang, DL,Lu, LZ,Ke, JJ. Rate equation of antisynergic extraction of cadmium with D2EHDTPA-TOA[J]. ACTA PHYSICO-CHIMICA SINICA,2004,20(3):275-279.
APA Zhang, DL,Lu, LZ,&Ke, JJ.(2004).Rate equation of antisynergic extraction of cadmium with D2EHDTPA-TOA.ACTA PHYSICO-CHIMICA SINICA,20(3),275-279.
MLA Zhang, DL,et al."Rate equation of antisynergic extraction of cadmium with D2EHDTPA-TOA".ACTA PHYSICO-CHIMICA SINICA 20.3(2004):275-279.
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