Commodity Production Costs Report
Paraxylene from Mixed Xylenes (Ethylbenzene Dealkylation)
p-Xylene Operating Costs & Plant Construction Costs
It presents the economics of a process for p-Xylene production from mixed xylenes in the United States, via isomerization followed by ethylbenzene (EB) dealkylation. In this process, a mixture of C8 aromatics is sent to an adsorption unit for the recovery of p-Xylene. 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.
Key reference(s): ?

The process under analysis comprises three major sections: (1) Adsorption; (2) Isomerization/Dealkylation; and (3) Fractionation.
Adsorption. The top product of the xylene splitter is fed to an adsorption unit, which generates an extract containing paraxylene and a raffinate with the ortho- and metaxylene, and ethylbenzene. Both streams are distilled (separately) to recover the desorption fluid. The raffinate then proceeds to the isomerization/dealkylation stage and the extract is sent to further fractionation.
Isomerization/Dealkylation. The Paraxylene-lean raffinate separated during adsorption 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 fresh mixed xylenes. This column removes heavy aromatics as its bottoms (to be sold as co-product), producing a mixed xylenes distillate that proceeds to adsorption. The extract stream produced during adsorption also goes through a final distillation stage to purify the paraxylene, generating a second stream of the toluene co-product.
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Professional report based on Q3 2024 economic data, ensuring timely evaluations.
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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
Other p-Xylene Production Cost Reports

Paraxylene from Mixed Xylenes (P-Xylene Crystallization)
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.
Details: 1100 kta United States-based plant | Q3 2024 | 107 pages | Issue D | From $799 USD

Paraxylene from Mixed Xylenes (O-Xylene Recovery)
It presents the economics of a typical process for p-Xylene production from mixed xylenes in the United States. In this process, o-xylene is also generated as by-product.
Details: 600 kta United States-based plant | Q3 2024 | 107 pages | Issue E | From $799 USD

Paraxylene from Toluene (STDP with Pentasil Zeolite Catalyst)
This report examines the costs related to a process for p-Xylene production from toluene in the United States. In this study, p-Xylene is produced via a selective toluene disproportionation process. High-purity benzene is also obtained as by-product.
Details: 400 kta United States-based plant | Q3 2024 | 107 pages | Issue F | From $799 USD
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