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2.3.3. Moisture content and ash content dispersion under the same conditions are presented in table
Moisture content was determined at 105°C after 2 h in an 1.
oven. [14]. Also, the amount of ash was estimated by igniting
the sample, at 58-60°C, in a muffle furnace [15]. Table 1: Physicochemical characteristics of CMC
samples obtained from CC, PC and MCC
2.3.4. CMC content DS Solubility CMC рН
Exactly 1.5 g of CMC was added to 100 mL of 80% aqueous Raw of in water, content, of 1 %
methanol solution. This mixture was stirred, kept for 10 min celluloses CMC % % solution
and filtered. The cake was washed with 100 mL of fresh 80% Cotton
aqueous methanol and dried to obtain pure CMC [16]. The cellulose 0,65 97,0 53,0 9,6
CMC content was calculated as follows: MCC 0,70 100 73,0 8,9
CMC content (%) = W × 100 PC 0,78 100 78,0 8,5

W0 (4) As can be seen from table 1, with the suspension method of
obtaining such quality indicators of CMC as DS, solubility in
where W0 (g) is the weight of sample before washing and W water and the content of the main substance in the samples
(g) is the weight of washed sample. is quite high.
2.3.5. Determination of solubility The high DS value of CMC obtained by the suspension
The solubility technique of Na-CMC is based on the method is explained by the low water content in the reaction
dissolution of the sample in water, followed by filtration of medium, as a result of which the rate of side reaction of
this solution through filter funnels. hydrolysis of MCC is significantly reduced in the aqueous

The filtering funnels are dried to constant weight for 2 hours organic medium, and as a result, the useful coefficient of the
at a temperature of 1050C, followed by cooling in a flow of the esterifying agent increases. And the high value of
desiccator to room temperature. the solubility index of CMC samples is apparently explained
by the high DS CMC values, in particular, its compositional
700 g of Na-CMC solution are prepared with a mass fraction homogeneity and low DP values.
of 0.1% in terms of an absolutely dry technical product.
The absence in Uzbekistan of the production of organic
Dissolution is carried out for at least 2 hours with stirring solvents, such as isopropyl alcohol (IPA), benzene, toluene
with a propeller-type stirrer. and others, hinders the development of suspension
The resulting solution settles for 1.0-1.5 hours to settle technology for the production of CMC. Suspension
insoluble particles and is filtered through a filter funnel on a technology of special grades of CMC can be mastered in the
water-jet pump, while the precipitate is quantitatively republic using technical grades of ethyl alcohol.
transferred to the filter. The filter residue is washed with At present, the industrial production of IPA has not been
150-200 ml of distilled water with stirring with a glass rod, mastered in the republic. Thus, local ethyl alcohol can be
then washed with 10 ml of ethyl alcohol, and then dried to usedin the production of CMC in a slurry manner.
constant weight (m2) at a temperature of 105 С.
0
We studied the effect of the carboxymethylation reaction of
The solubility of Na-CMC in water (Xi) in percent is MCC and PC on the physicochemical parameters of the
calculated by the formula: obtained CMC samples and determined the optimal
Хi = ((m1-m2)) ∙ 100 conditions for the preparation of highly substituted CMC
samples from the MCC and PC in the suspension method in
m1 (5) isopropyl and ethyl alcohol.
where m1 is the mass of the Na-CMC sample in terms of Comparative studies of the alkaline treatment of MCC and PC
absolutely dry matter, g; at various concentrations of sodium hydroxide in the
m2 - mass of filter cake, dried to constant weight, g. medium of IPA and ethanol were carried out.
2.3.6. Infrared spectroscopic analysis
Infrared spectra of Na-CMC samples are recorded on a
SPECORD IR-75 instrument in the range of 4000 cm - 400
-1
cm .
-1
3. Results and discussions
The esterification of MCC and PC was carried out according
to the known suspension technology [17, 18] in ethanol. To
do this, 20 ml of ethanol is added to 10 g of MCC or PC with
vigorous stirring for 20 minutes, followed by the inclusion of
30 ml of a 40% aqueous solution of sodium hydroxide. Then
25 ml of ethyl alcohol containing 11.0 g of dissolved MCC was
gradually added to the mixture, and stirred for 3 hours at 70
° C. The reaction product is filtered off, washed with ethyl
alcohol and dried to constant weight at a temperature of
800C. Fig. 1: Dependence of DS of CMC from MCC on alkali
concentration
The results of suspension carboxymethylation of samples of
cellulose-containing raw materials of different nature and

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