Temat: CO2 w stanie nadkrytycznym - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Reactive extraction of citric acid using supercritical CO2 and trioctylamine
Autorzy:: Djas, M.
Henczka, M.
Potocka, K.
Wawer, J.
Powiązania:: https://bibliotekanauki.pl/articles/115431.pdf
Data publikacji:: 2015
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Tematy:: reactive extraction
supercritical CO2
citric acid
trioctylamine
reaktywna ekstrakcja
CO2 w stanie nadkrytycznym
kwas cytrynowy
trietyloamina
Opis:: The paper is dedicated to the integrated process of the reactive extraction of citric acid from aqueous solution using supercritical CO2 and trioctylamine. The aim of this study is to investigate the influence of process parameters (concentration of reactants in phases, pressure, temperature, mixing rate, mixing time) on the course of the reactive extraction process. The increase of the initial concentration of amine (0.04-0.07 mol∙dm-3) results in the higher efficiency of reactive extraction. The influence of pressure (12-18 MPa) on the process is negligible. The process efficiency decreases with temperature (308-328 K). The increase of stirrer speed (250-500 rpm) leads to increase of process rate, so the final efficiency is obtained in shorter time.
Źródło:: Challenges of Modern Technology; 2015, 6, 4; 27-30
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Zastosowanie zielonych rozpuszczalników w syntezie nienasyconych związków boro- i krzemoorganicznych na drodze reakcji hydrometalacji i sprzęgania Marcińca
Application of green solvents in the synthesis of unsaturated organoboron and organosilicon compounds via catalytic hydrosilylation and Marciniec coupling reactions
Autorzy:: Walkowiak, Jędrzej
Powiązania:: https://bibliotekanauki.pl/articles/1413280.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Chemiczne
Tematy:: hydrometalacja
reakcja sprzęgania
CO2 w stanie nadkrytycznym
ciecze jonowe
poli(glikol etylenowy)
PEG
kataliza homogeniczna
hydrometallation
coupling reaction
supercritical CO2
ionic liquids
poly(ethylene glycol)
homogeneous catalysis
Opis:: Unsaturated organoboron and organosilicon compounds constitute an important class of organometallic compounds, which due to the presence of silyl- or boryl- group attached to Csp2 atoms, their simple and straightforward transformations in coupling and demetallation reactions, found a broad range of applications in the synthesis of fine chemicals or new materials with tailored properties. Such compounds might be synthesized in many transformations but two of them: hydrometallation and Marciniec coupling reactions permitted to obtain compounds with high effectivity, selectivity, and in the case of hydrometallation reactions with excellent atom economy. Most of these processes occur in a homogeneous phase, which ensures excellent yields and stereo- and regioselectivity. On the other hand, such conditions generate problems with catalyst reuse, product separation, and substantial consumption of toxic, volatile organic solvents. According to the assumptions of sustainable development in chemistry, the new procedures, which allow to intensify the process in terms of its efficiency, according to green chemistry rules are of prior importance in modern chemical industry. In this manuscript, the newest achievements in the application of green solvents (ionic liquids, liquid polymers, and supercritical CO2) in catalytic hydrometallation of alkynes and coupling of vinylmetalloids with olefins are discussed. Such an approach builds a new strategy for effective catalyst immobilization and its reuse, the increase of process productivity by the application of repetitive batch processes, and elimination of organic solvents, typically used in these transformations. Selected contributions in this field of chemistry are presented within this review.
Źródło:: Wiadomości Chemiczne; 2021, 75, 1-2; 111-136
0043-5104
2300-0295
Pojawia się w:: Wiadomości Chemiczne
Dostawca treści:: Biblioteka Nauki

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