Cellulose drying

Effect of other factors on cellulose. Dry distillation at a temperature above 150°C causes cellulose to produce compounds of low molecular weight, such as water, methane, ethylene, carbon monoxide, carbon dioxide, acetic acid, and acetone. According to Pictet [49] dry distillation under reduced pressure yields a substance having the empirical formula C6H10Oj, laevo-glucosan which probably is /3-D-glucopyranose anhydride ... 

The advantage of pneumatic driers is that they serve both for drying and transporting the cellulose. Drying is very quick. 

Araki, K., M. Ichino, and T. Hoshino Radiation induced grafting onto cellulose (dry state grafting). Ann. Rep. Japan Assoc. Radiat. Research on Polymers 2, 465 (1960). 

Chemical cotton is one of the purest forms of cellulose obtainable, containing 96-98% cellulose (dry basis)... 

Was psed by Bur seen berger(Ref 3,p 89) ioc the pcepn of an expl corrpn in which cellulose, dried mu ooms, etc were treated with glycine and then impregnated with NG... 

Finishing wood cellulose Other sources of cellulose Drying cellulose before nitration Industrial nitration of cellulose Mixed acids Nitration m pots Centrifugal nitration Thomsons method Nitration with mechanical stirring German method Continuous methods of nitration Literature... 

Cellulose and methyl cellulose Dry or moist Hydrogen bridges ... 

Experiment III digestion and intake results are summarized in Table III. In all cases, NaOH treatment significantly increased cellulose, dry matter, and gross energy digestion coefficients. Digestibility coeffi-... 

Solution— I Residue— 111 Hexa-nitro-cellulose Dry and weigh, ignite 111 (Grm cotton). and reweigh. Loss = 1111 Cellulose. 1111111 Residue consists of 1111 sawdust, charcoal, ... 

Wei, B., Yang, G., Hong, F., 2011. Preparation and evaluation of a kind of bacterial cellulose dry films with antibacterial properties. Carbohydr. Polym. 84, 533—538. 

The more suitable purification method for the bacterial cellulose calls upon distilled water, sodium hydroxide and sodium hypochlorite solutions, since it guarantees the elimination of bacteria cells and culture medium residues from the membrane. For clinical applications, the suitable sterilization processes are gamma radiation and ethylene oxide treatment, but the latter should be avoided for bacterial cellulose dry or wet membrane, because it can cause allergic reactions, mostly when used internally. 

Figure 17.7 (a) Bacterial cellulose dry membrane mesh and (b) a thrombocyte (blood component). (Reprinted from... 

As shown in Fig. 17.11, a bacterial cellulose dry membrane can be heated up to 325°C before it starts to bum, which is at least 75 °C above the burning temperature of conventional office paper. This higher thermal resistance can is attributed to the absence of additives in its composition, which are common in papermaking. 

The applications of bacterial cellulose dry and wet membranes have increased considerably in last couple of decades, mainly in the biomedical field, as recently thoroughly reviewed [23], and high technology areas, and also in other sectors, as summarized below. 

To a resin flask equipped as previously described are added 50 gm (0.4 mole) of melamine, 37.3 gm (0.4 mole) of phenol, and 119gm of 40.3% (1.6 moles) of formaldehyde. The pH is adjusted to 3-6, and the solution is heated to 95°C and kept at that temperature for hr. At this point the solution forms two layers. The entire reaction mixture is blended with 60 gm of cellulose, dried, and ground up to a fine powder. The resulting material is suitable for use as a molding resin and thermosets at 150°C to an infusible solid. 

Matyushin, Yu.N., Korchatova, L.I., Sopin, V.F., Marchenko, G.N., and Lebedev, Yu.A., Investigation of the effect of cellulose drying conditions on its thermal value, l-st All-Russia Conference Cellulose synthesis and its control Proceedings, Kazan KKhTl Publ., 1980, pp. 36-37 (in Russian). 

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