Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Cellulose phases

As mentioned previously, cellulosic phases as well as amylosic phases have also been used extensively for enantiomeric separations more recently (89,90). Most of the work ia this area has been with various derivatives of the native carbohydrate. The enantioresolving abiUties of the derivatized cellulosic and amylosic phases are reported to be very dependent on the types of substituents on the aromatic moieties that are appended onto the native carbohydrate (91). Table 3 fists some of the cellulosic and amylosic derivatives that have been used. These columns are available through Chiral Technologies, Inc. and J. T. Baker, Inc. [Pg.66]

The phosphomolybdic acid reagent can be employed on silica gel, aluminium oxide, polyamide, RP-2, RP-18 and cellulose phases and also on silver nitrate-impregnated silica gel [13]. [Pg.377]

The reagent can, for instance, be used on silica gel, kieselguhr. Si 50000, NH2 and Diol layers RP-18W, CN, polyamide and cellulose phases are not suitable [15]. [Pg.160]

Cellulosic papermaking fibers, 18 91 Cellulosic phases, for chiral separations, 6 88-89... [Pg.157]

Cellulosic fibers contain a partly crystalline cellulose phase as the main constituent. The grafting reactions can usually occur only with the amorphous or disordered cellulose. Only highly swollen cellulose with an expanded lattice may react throughout the ordered regions. [Pg.254]

The formation of an isotropic cellulose phase after storage of TFA-CH2CI2 solutions is due to degradation of the cellulose, (Tables m and IV), presumably by attack of TFA at the glycosidic linkages, as the extent of degradation increases wd A... [Pg.188]

Very similar properties to derivatised cellulose phases ... [Pg.84]

Bayberry extracts Ethyl cellulose Phase separation Protection of antioxidant activity [159]... [Pg.780]

Paper-contaminated plastics waste collected from the municipal solid waste stream is a potentially inexpensive source of cellulose for bulk composite applications. However, the processing of such waste stream is very difficult because of a high melt viscosity and agglomaration of the cellulose phase. A method for the hydrolytic pretreatment with acid in gas phase of such waste has been recently developed in our laboratories (11). [Pg.76]

Dockx has suggested that phase transfer catalysts enhance the concentration of hydroxide ion in the non-aqueous phase. In the case of cellulose modification, this would accelerate undesirable side reactions of the reagents without promoting any interaction with the hydrophilic cellulose phase. Our data is consistent with this interpretation when long chain tetraalkylammonium salts are employed. If the alkyl chain length exceeds four carbon atoms, lower degrees of substitution are achieved in the presence of catalyst than are obtained in control experiments. A corresponding increase in the concentration of hydrolysis products confirms that the main activity is in the non-aqueous phase. [Pg.46]


See other pages where Cellulose phases is mentioned: [Pg.355]    [Pg.135]    [Pg.363]    [Pg.66]    [Pg.119]    [Pg.336]    [Pg.354]    [Pg.333]    [Pg.66]    [Pg.150]    [Pg.376]    [Pg.124]    [Pg.23]    [Pg.810]    [Pg.83]    [Pg.31]    [Pg.49]    [Pg.49]    [Pg.58]    [Pg.58]    [Pg.240]    [Pg.361]    [Pg.431]    [Pg.136]    [Pg.178]    [Pg.304]    [Pg.258]    [Pg.115]    [Pg.46]    [Pg.47]   
See also in sourсe #XX -- [ Pg.239 ]




SEARCH



Agarose, cellulose, and Sephacryl solid phases

Cellulose microcrystals, phase separation

Cellulose phases applications

Cellulose phases preparation

Cellulose-based phase

Chiral phases cellulose derivatives

Chiral phases celluloses

Chiral stationary phases cellulose

Chiral stationary phases cellulose esters

Chiral stationary phases cellulose triacetate

Chromatography cellulose phases

Nanocrystalline Cellulose as Reinforce Phase

Nitration of cellulose in the gaseous phase

Phase cellulosics

Phase cellulosics

Preparation of Cellulose Hydrogel Film with Phase Inversion Process

Stationary phases cellulose derivatives

Stationary phases cellulose, preparation

The Synthesis of Hydrophobe-Modified Hydroxyethyl Cellulose Polymers Using Phase Transfer Catalysis

Thermotropic phase, cellulosic

Thermotropic phase, cellulosic mesophases

© 2024 chempedia.info