DEVELOPMENT OF A MODEL OF THE ETHYLENE HYDRATION PROCESS TAKING INTO ACCOUNT ITS INSTABILITY
DOI:
https://doi.org/10.31471/1993-9981-2023-1(50)-60-71Keywords:
hydration, ethylene, ethyl alcohol, ethanol, catalyst, reaction, ethyl alcohol, parameters, temperature, pressure, circulation, gas, ethylene, phosphoric acid, control.Abstract
A detailed analysis of the method of obtaining ethylene, which plays an important role in the development of the oil and gas industry,was carried out. The characteristics of ethylene and its properties were given.The influence of temperature, pressure and ethylene circulation on
the process is thoroughly considered. The dependence of the degree of conversion of ethylene to alcohol on the amount of acid in the reactor,
the indicators of the ethylene hydration process on the concentration of ethylene in the circulating gas, and the indicators of the ethylene hydration
process on the water-circulating gas molar ratio were obtained. The most optimal option was chosen and the chosen method of ethylene
hydration with different catalysts was justified. The methods used in the industry to obtain ethyl alcohol were analyzed and, based on a
comparison of the advantages and disadvantages of existing catalysts, the most economical, profitable and active one was chosen. The method
of obtaining ethanol by direct hydration of ethylene is substantiated by technical and economic calculations. The optimal technological mode
of the hydration process was chosen, and therefore, the reactions will contribute to an increase in pressure and a decrease in temperature.
The selected method of periodic feeding of the catalyst with the required amount of phosphoric acid significantly reduces process costs.
The calculation of the process of direct hydration of ethylene, which takes place in non-stationary conditions caused by the removal of
phosphoric acid from the surface of the carrier and which leads to a decrease in the productivity of ethyl alcohol, is carried out.
To maintain the stable operation of the catalyst, a control function is proposed, the accounting of which in the kinetic model of the process
allows maintaining the productivity of ethyl alcohol at a constant level. A mathematical model of the ethylene hydration process was developed,
which made it possible to maintain the productivity of ethyl alcohol at the required (stationary) level with the least expenditure on
the consumption of phosphoric acid.
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