Original Article
Chemistry
Amin Ahmadpour
Articles in Press, Accepted Manuscript, Available Online from 10 February 2023
Abstract
Heat exchangers are used as the most important equipment to transfer the energy of materials to each other, to increase or decrease the energy level of material flows. The purpose of this research is to optimize and estimate costs for re-boiler, one of the leading units of National Petrochemical Industries ...
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Heat exchangers are used as the most important equipment to transfer the energy of materials to each other, to increase or decrease the energy level of material flows. The purpose of this research is to optimize and estimate costs for re-boiler, one of the leading units of National Petrochemical Industries Company. This heat exchanger is in the form of a plate, which is used as a re-boiler for tower 511. In this research, ASPEN PLUS and ASPEN EXCHANGER DESIGN & RATING software were used to design and estimate costs. This design is based on the conditions required to set up tower 511 of methanol to propylene conversion unit. Based on the designs, the required area for the converter was 2.6 square meters, which compared to the previous converter, we had an increase of about 8% in the area for heat exchange.
Original Article
Chemical Engineering
Amin Ahmadpour; Rozita Kaviani
Articles in Press, Accepted Manuscript, Available Online from 10 February 2023
Abstract
Today, the recovery of acetone as an expensive and widely used solvent in the production units of methyl methacrylate, bisphenol A, MTBA, plastics and synthetic fibers is very important. One of the most common recovery methods is the absorption process (solvent separation), which is sometimes used in ...
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Today, the recovery of acetone as an expensive and widely used solvent in the production units of methyl methacrylate, bisphenol A, MTBA, plastics and synthetic fibers is very important. One of the most common recovery methods is the absorption process (solvent separation), which is sometimes used in combination with surface absorption or membrane separation due to its cheapness and availability of knowledge. In this research, it was simulated with Aspen Plus V 7.2 software and the experimental rules of absorption and distillation columns, and with the Levi-Benn model to recover 99.5% of acetone from its mixture with air (10.3-687Mol/hour), the optimal conditions for the absorption tower, 20 equilibrium stages were obtained at atmospheric pressure with effluent and return gas from the separation section. In this situation, the molar ratio of the reflux of the distillation tower is 20.9 with the minimum energy consumption in the partial condenser at the rate of 2.3 Kw and 20 equilibrium stages.
Original Article
Chemical Engineering
Amin Ahmadpour; Mehdi Jalali
Articles in Press, Accepted Manuscript, Available Online from 10 February 2023
Abstract
Most of the equipment used in material transportation industries, chemical and non-chemical process industries, and even most military equipment use metal base structures. Corrosion of metals, destruction of metal structure or basic alloy is an obvious thing, the consequences of which may be economic, ...
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Most of the equipment used in material transportation industries, chemical and non-chemical process industries, and even most military equipment use metal base structures. Corrosion of metals, destruction of metal structure or basic alloy is an obvious thing, the consequences of which may be economic, human, environmental, or in general, the collection of these losses. All these unpleasant consequences stem from several factors, one of the most important and main mechanisms is the phenomenon of corrosion of metal atoms (loss of valence layer electrons of the metal in the presence of oxidizing agents) and their transformation into ions, which are forced to leave the metal structures and entering the surrounding solution or electrolyte. These phenomena lead to the loss of metal mass, which can manifest itself as a decrease in overall thickness (uniform corrosion) and progressive holes in the depth of the metal (pitting corrosion). In general, corrosion is the cause of mechanical failure and the reduction of structural strength is a target process, because its effects cause the equipment to be destroyed and taken out of service against a mechanical stress higher than the threshold of tolerance, followed by economic losses, human casualties and the environment biologically obtained. Historically, researchers and engineers have always faced the phenomenon of corrosion, and depending on the era in which they lived and the level of science and technology at that time, they used one of the methods to protect the surface against corrosion and other destructive mechanisms of the equipment's materials. Covering the surface with a resistant layer against the penetration and attacks of corrosive and destructive agents is one of the most traditional methods of protecting materials against the destructive behavior of the environment that surrounds a device during its lifetime.
