Paraxylene from Mixed Xylenes (O-Xylene Recovery)
p-Xylene Production Costs Report | Issue E | Q3 2024
Report Details |
600 kta United States-based plant | Q3 2024 | 107 pages |
This report presents a cost analysis of a 600 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
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.
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 two major sections: (1) Products Separation; and (2) Isomerization.
Products Separation. Fresh mixed xylenes stream is first submitted to clay treatment to remove impurities. The outlet stream is fed along with a mixed xylenes steam recovered downstream to a distillation column. While the bottom stream is separated in a further column, generating ortho-xylene and a valuable heavy aromatics stream, the distillate is passed through an adsorption unit. In that unit, Paraxylene product is extracted from other major streams that are sent to isomerization. The extract is submitted to distillation steps, from which high purity Paraxylene and a small amount of toluene are obtained.
Isomerization. C8 aromatic compounds - ethyl benzene, meta-xylene, ortho-xylene - and residual nonaromatics are stripped off from the dilute raffinate produced in the adsorption unit. A desorbent-rich stream is purified from heavy impurities and recycled to the adsorption unit. Then, the C8 stream is vaporized and heated with hydrogen to the isomerization reaction temperature. This hot feed stream is passed radially through a fixed bed of a molecular sieve catalyst, in such a way that part of the remaining aromatics are converted to Paraxylene. Such isomerization step reestablishes a near-equilibrium distribution of xylene isomers. After further distillation steps, the recovered xylenes are recycled to the adsorption unit.
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Production Process Information
Process Consumptions
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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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