DETERMINATION OF OPTIMAL PARAMETERS OF METHANOL PRODUCTION PROCESS AND MATHEMATICAL MODELING OF THE REACTION UNIT
Autors:Aliyev Isa Vali- the Republic of Azerbaijan,“Azerbaijan State Oil and Industry University”, master’s degree.
Ibrahimov Chingiz Shirin- the Republic of Azerbaijan,“Azerbaijan State Oil and Industry University”,Associate Professor, PhD in Chemistry.
Annotation:Carbon dioxide (CO2) is one of the greenhouse gases that can cause global warming. One of the ways to reduce CO2 emissions is to convert CO2 into valuable products (such as methanol). Methanol is produced from petroleum products (synthesis gas) by hydrogenation of methanol, CO and CO2. The purity of the obtained methanol is 99.5%.
Keywords: methanol, optimal parameter, mathematical modeling
Today, much of the world's energy comes from the combustion of carbonate fuels such as coal, oil and natural gas. Carbon dioxide from this combustion is one of the gases that can cause global warming. Recent studies have shown that doubling the amount of CO2 in the atmosphere will have a stronger greenhouse effect. Its volume is expected to increase by 5.4% in the next few decades. Therefore, a lot of research has been done in this area to control the amount of carbon dioxide in the atmosphere. CO2 is a useful raw material for the production of chemicals. CO2 is used in food conservation, beverage carbonation, firefighting, critical extraction, dry ice, etc. used in various applications such as. In the field of conversion of CO2 to other products, urea synthesis is the first, and methanol synthesis is the second .
Methanol is used in the chemical industry as both a solvent and a reagent. Methanol is used in many household products, including paints, varnishes and cleaning products. In addition, methanol can be used as a component of motor fuel or gasoline mixture. Methanol-powered vehicles use a mixture of 85 percent methanol with 15 percent gasoline (M85). Laboratory and road tests show that the addition of 10% methanol can increase the octane number by 2-3 .
Methanol is produced from petroleum products (synthesis gas) by hydrogenation of methanol, CO and CO2. CuO/ZnO/Al2O3 catalysts are used in the production of methanol from synthesis gas. The zeolite membrane reactor combined with CuO/ZnO/Al2O3 provides more CO2 conversion, methanol productivity and selectivity than a conventional reactor. Copper-based catalysts are widely used in the hydrogenation of methanol CO2 to methanol due to their low cost and high catalyst activity. The addition of MgO and MnO increases the catalytic activity of the catalyst .
Two reactors are involved to accelerate the hydrogenation of CO2. In this process, at a temperature of 40 °C and a pressure of 20 bar, 1000 kmol of carbon dioxide is mixed with 3000 kmol of hydrogen per hour. The mixture is then compressed, heated and sent to the first equilibrium reactor. The first reactor partially converts CO2 to methanol as a liquid product, as shown in equations (3) - (5). Unreacted CO2 and H2 are then fed to a second equilibrium reactor to produce more methanol.
Picture: 1 The hydrogenation of CO2
The pressure of the gas phase leaving the second reactor reduces the recovery of liquid methanol as a liquid phase. All liquid methanol products are sent to the first distillation column and light components (CO, CO2 and H2) are released from the top of the column. The mixture of methanol and water exits the top of the column and enters the second distillation column, where methanol with a purity of 99.5% is formed at the top of the column .
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