Organizing co mmittee

 
 

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Poster presentation 
178 
OBTAINING A PHYSIOLOGICALLY ACTIVE SUBSTANCE 
FROM THE WASTE OF A COTTON CLEANING PLANT 
 
O.О. Rakhmonov, J.S. Shukurov, А.S. Togasharov 
 
The Institute of General and Inorganic Chemistry of AcSc RUz, 
e-mail: [e-mail] 
 
Cotton defoliation is considered one of the important agrochemical measures, it 
allows you to immediately harvest a rich crop grown throughout the year. As a result of 
defoliation based on organic preparations, young bolls die before opening, the quality of 
the cotton fiber decreases and the oil content of the seeds decreases. This leads to the 
loss of 1.5÷2 centners of yield per hectare. Therefore, by adding compounds with 
physiological activity to the composition of inorganic defoliants, it is advisable to create 
new generation defoliants. 
Considering the above, for the physico-chemical justification of obtaining defoliants 
with physiological activity, the processes of extraction of waste from a cotton cleaning 
plant using hydrochloric acid and neutralization of the obtained acid extracts with 
monoethanolamine were studied, and on their basis optimal conditions for obtaining 
physiologically active substances were determined. 
The process of extraction of waste from a cotton cleaning plant at various 
concentrations of hydrochloric acid was investigated. Optimal parameters of the acidic 
product extraction process have been established. According to the research results, the 
crystallization temperature is -3.5 °C, the refractive index of light is n-1.3382, the 
density is 1.019 g/cm
3
, the viscosity is 1.014 mm
2
/C, and the pH value of the medium is 
0.65.
Chemical analysis of the resulting acidic extract revealed the presence of carboxylic 
acids and an excess of hydrochloric acid. To obtain a physiologically active substance, 
the acidic extract was neutralized with monoethanolamine. For neutralization, 2.2 % 
monoethanolamine was used. The pH value of the resulting product was 7.0. A change 
in the density of solutions from 1.019 to 1.015 g/cm
3
, and viscosity from 1.014 to 1.059 
mm
2
/s was observed. 
The solution was evaporated to increase the concentration of the physiologically 
active substance obtained in the liquid state. The process was carried out in a rotary 
evaporator (RE100-Pro), equipped with a vacuum pump (diaphragm vacuum pump LH-
95D/C).
Evaporation of the solution was carried out at temperatures of 70, 85 and 100°C, 
sampling of the solution was performed periodically at certain intervals, and after 
analyzing the salt content, a graphical dependence was built in coordinates. 
It has been found that the higher the temperature, the higher the rate of water 
evaporation. The optimal temperature is 100ºС, since at this temperature, after 30 
minutes, due to the evaporation of 39.45 % of water, a physiologically active substance 
with an active substance content of 56.2 % was obtained.