What Are Supercritical Fluids?

Knez, Željko; Lütge, Christoph

doi:10.1007/978-3-031-34636-1_2

Cited by 1 publication

(2 citation statements)

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“…Carbon dioxide is a well-known alternative solvent having various applications . Despite being primarily known as a greenhouse gas, carbon dioxide as process fluid or solvent is green and environmentally benign, and it is also generally regarded as safe (GRAS) solvent.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon dioxide is a well-known alternative solvent having various applications. 17 Despite being primarily known as a greenhouse gas, carbon dioxide as process fluid or solvent is green and environmentally benign, and it is also generally regarded as safe (GRAS) solvent. It is mainly used at high pressure or in a supercritical state, where its physical-chemical properties (for example, density and viscosity) depend on pressure and temperature relatively sharply (at least in the vicinity of the critical values).…”

Section: Introductionmentioning

confidence: 99%

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Continuous Stripping with Dense Carbon Dioxide

Kőrösi,

Kántor,

Bana

et al. 2023

ACS Omega

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The integration of flow chemistry into continuous manufacturing requires efficient, controllable, and continuous methods for the concentration of diluted solutions on relatively small scales. The design and application examples of a new continuous solvent removal process are presented. The continuous stripping method employing dense carbon dioxide is based on the formation of homogeneous mixtures of dilute organic solutions of the target molecules with a large excess of carbon dioxide at temperatures as low as 35 °C and pressures around 10 MPa. Subsequent pressure reduction results in the quick release of carbon dioxide and vaporization of a significant fraction of the organic solvent. The concentration of the solute in the separated liquid phase can be up to 40 times higher than in the feed. Among the many controllable process parameters, the most significant ones are the mass–flow rate ratio of carbon dioxide to the feed and the temperature of the phase separator. By careful setting of the operational parameters, the degree of concentration enhancement may be accurately controlled. The new apparatus—despite consisting of laboratory equipment and being built in a fume hood—could easily support pilot-scale synthetic flow chemistry, being a continuous, efficient alternative to thermal concentration methods.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%