Paraxylene from Mixed Xylenes (P-Xylene Crystallization)
p-Xylene Production Costs Report | Issue D | Q2 2024
Report Details |
1,100 kta United States-based plant | Q2 2024 | 107 pages | Delivered in PDF |
This report presents a cost analysis of a 1,100 kta (kilo metric ton per annum) United States-based plant. You can add a customized cost analysis, assuming another location (country), when ordering a premium edition of this report.
Report Abstract
This report analyses the economics of a process for p-Xylene production from mixed xylenes in the United States. In this process, a mixture of C8 aromatics is sent to a crystallization recovery unit for p-Xylene separation. The remaining xylenes are isomerized to equilibrium and the EB is dealkylated to benzene by-product.
The report provides a comprehensive study of p-Xylene production and related p-Xylene production cost, covering three key aspects: a complete description of the p-Xylene production process examined; an in-depth analysis of the related p-Xylene plant capital cost (Capex); and an evaluation of the respective p-Xylene plant operating costs (Opex).
The p-Xylene production process description includes a block flow diagram (BFD), an overview of the industrial site installations, detailing both the process unit and the necessary infrastructure, process consumption figures and comprehensive process flow diagrams (PFD). The p-Xylene plant capital cost analysis breaks down the Capex by plant cost (i.e., ISBL, OSBL and Contingency); owner's cost; working capital; and costs incurred during industrial plant commissioning and start-up. The p-Xylene plant operating costs analysis covers operating expenses, including variable costs like raw materials and utilities, and fixed costs such as maintenance, labor, and depreciation.
Process Schematic
The process under analysis comprises three major sections: (1) Crystallization; (2) Isomerization/Dealkylation; and (3) Fractionation.
Crystallization. A mixed xylenes stream goes through a two-step crystallization process. In the first step, the mixture has its temperature lowered in a crystallizer to the point where crystals of Paraxylene are formed. The crystals are then separated from the mother liquid by a centrifuge. In the second step, they are fed to a tank, where the temperature gradually rises and the remaining isomers that were trapped in the crystals are melted away. After a second centrifugation, the crystals are washed and melted yielding high purity Paraxylene.
Isomerization/Dealkylation. The Paraxylene-lean filtrate separated during Crystallization is fed, along with hydrogen, to a reactor where ortho- and metaxylene are isomerized and ethylbenzene is dealkylated to benzene and ethane. The product from the reaction comprises a near-equilibrium mixture of all xylene isomers, unreacted ethylbenzene and hydrogen, benzene, and minor amounts of by-products generated. This stream is cooled and sent to a gas-liquid separation step to recover the unreacted hydrogen.
Fractionation. The liquid product from reaction is sent to a stabilizer column, to be first separated in three streams: light hydrocarbons, a benzene/toluene mixture, and mixed xylenes. The lights are burned for fuel. The benzene-toluene mixture is sent to a benzene column for separation of benzene co-product from toluene (also sold as co-product to gasoline blending facilities). The xylenes obtained from the bottom of the stabilizer column are fed to the xylene column, which also receives the process feed of mixed xylenes. In this last column, heavy aromatics are removed from the bottom as by-products while the mixed xylenes stream proceeds to crystallization.
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Production Process Information
Process Consumptions
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Plant Capital Cost Summary
Operating Cost Summary
Production Costs Datasheet
Plant Capital Cost Details
Operating Cost Details
Plant Cost Breakdowns
Plant Capacity Assessment
Process Flow Diagrams
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Content Highlights
Plant Capital Cost Summary
Summary outlining the capital cost required for building the p-Xylene production plant examined
Plant Capital Cost Details
Detailing of fixed capital (ISBL, OSBL & Owner’s Cost), working capital and additional capital requirements
Plant Cost Breakdowns
Breakdown of p-Xylene process unit (ISBL) costs and infrastructure (OSBL) costs; plant cost breakdown per discipline
Operating Costs Summary
Summary presenting the operating variable costs and the total operating cost of the p-Xylene production plant studied
Operating Cost Details
Detailing of utilities costs, operating fixed costs and depreciation
Plant Capacity Assessment
Comparative analysis of capital investment and operating costs for different p-Xylene plant capacities
Production Process Information
Block Flow Diagram, descriptions of process unit (ISBL) and site infrastructure (OSBL)
Process Consumptions
Raw materials and utilities consumption figures, by-products credits, labor requirements
Process Diagrams
Process flow diagrams (PFD), equipment list and industrial site configuration
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