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ULTRAFILTRATION REACTOR [1 record]
Record 1 - internal organization data 2012-06-26
Record 1, English
Record 1, Subject field(s)
- Biological Sciences
Record 1, Main entry term, English
- ultrafiltration reactor
1, record 1, English, ultrafiltration%20reactor
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- ultrafiltration membrane reactor 2, record 1, English, ultrafiltration%20membrane%20reactor
correct
- UF membrane reactor 2, record 1, English, UF%20membrane%20reactor
correct
- UF-membrane stirred reactor 2, record 1, English, UF%2Dmembrane%20stirred%20reactor
correct
- CSTR/UF membrane reactor 2, record 1, English, CSTR%2FUF%20membrane%20reactor
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
Well-mixed reactors which rely on a selective membrane to separate low molecular weight products from higher molecular weight substrates. They are therefore most useful for carrying out depolymerization reactions, especially when using soluble enzymes, so as to ensure good contact with macromolecular substrates. The main disadvantages associated with the use of these reactors are the small sizes of reactor available, and concentration polarization, that is blockage of the pores in the membrane by solid, fat or colloid particles present in the substrate. 1, record 1, English, - ultrafiltration%20reactor
Record number: 1, Textual support number: 1 CONT
Production of glucose from cellulose by enzymic methods has been investigated, and a procedure using an enzyme reactor having an ultrafiltration membrane has been reported for this purpose. Cellulose was heated at 200° C in a running porcelain pot mill for 25 min, ground to fine particles with a diameter of 50-150μ, and then suspended in water. The cellulose suspension was reacted with cellulase from Trichoderma viride in an ultrafiltration membrane reactor, and the resulting glucose syrup was continuously removed from the reactor through the membrane. 3, record 1, English, - ultrafiltration%20reactor
Record number: 1, Textual support number: 1 OBS
Similar selective membranes have also been used in hollow-fibre reactors, which can be used in a plug-flow fashion with substrate rapidly recirculated through the reactors, but with the enzyme located inside the fibre. 1, record 1, English, - ultrafiltration%20reactor
Record 1, French
Record 1, Domaine(s)
- Sciences biologiques
Record 1, Main entry term, French
- réacteur à ultrafiltration
1, record 1, French, r%C3%A9acteur%20%C3%A0%20ultrafiltration
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Les réacteurs à ultrafiltration présentent l'inconvénient de posséder un rapport surface de membrane/volume peu favorable. En outre, le phénomène de polarisation de la membrane qui résulte de l'accumulation de composés de masse molaire importante au voisinage de celle-ci provoque souvent une limitation non négligeable du débit. Les membranes d'ultrafiltration commercialisées surtout par AMICON et MILLIPORE, sont disponibles dans un très large éventail de seuils d'exclusion. Ce seuil est le paramètre essentiel intervenant dans le choix de ces membranes car il détermine aussi bien le degré de rétention de l'enzyme ou du substrat que le débit maximal pouvant être atteint. 1, record 1, French, - r%C3%A9acteur%20%C3%A0%20ultrafiltration
Record number: 1, Textual support number: 1 OBS
Dans le cas particulier des réacteurs à ultrafiltration où le débit est déterminé par le diamètre moyen des pores, le fait d'augmenter artificiellement par immobilisation la taille de la molécule d'enzyme, permet de travailler avec des membranes dont les pores ont un diamètre supérieur, c'est-à-dire à des débits plus élevés. 1, record 1, French, - r%C3%A9acteur%20%C3%A0%20ultrafiltration
Record 1, Spanish
Record 1, Textual support, Spanish
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