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Dynamic pH determin...
Dynamic pH determination at high pressure of aqueous additive mixtures in contact with dense CO2
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- Andersson, Martin (författare)
- Uppsala University,Uppsala universitet,Mikrosystemteknik
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- Rodriguez-Meizoso, Irene (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Turner, Charlotta (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Hjort, Klas, 1964- (författare)
- Uppsala University,Uppsala universitet,Mikrosystemteknik
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- Klintberg, Lena (författare)
- Uppsala University,Uppsala universitet,Mikrosystemteknik
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(creator_code:org_t)
- Elsevier BV, 2018
- 2018
- Engelska.
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Ingår i: Journal of Supercritical Fluids. - : Elsevier BV. - 0896-8446 .- 1872-8162. ; 136, s. 95-101
- Relaterad länk:
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http://www.sciencedi...
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- A system consisting of a high-pressure tolerant microfluidic glass chip, high-speed absorbance imaging, and image processing has been developed to study rapid dynamic events like pH change in a multiphase flow. The system gives both kinetic and quantitative equilibrated information. By tracking the interactions of aqueous additive mixtures and liquid CO2, at 80 bar and 24 °C, under flow, measurement at a given P, T condition is done in 0.25 s. The acidification rate to steady state was found to be mass transport limited, occurring in less than 1 s. For 30 mM of the additives ammonium acetate and ammonium formate, equilibrium pH of 4.5 and 4.1, respectively, was seen. These additives are of key importance in common mobile phases used in SFC.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- Supercritical fluid chromatography
- High-pressure microfluidics
- Additive salts
- Dense CO
- Multiphase flow
- Image analysis
- Additive salts
- Dense CO
- High-pressure microfluidics
- Image analysis
- Multiphase flow
- Supercritical fluid chromatography
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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