---
title: Technical Article - Xylene-loop scheme for minimized GHG emissions  and PX production cost
description: "Molecular management, energy efficiency and carbon dioxide emissions have become major focuses \nfor petrochemical complexes, including aromatics plants"
image: https://resources.axens.net/hubfs/Landing%20Pages/Resources/Technical%20Article/Thumbnails/Thumb_Axens_TA_Xylene-loop%20scheme%20for%20minimized%20GHG%20emissions_EN_2022.png
---

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 Technical Article

# Xylene-loop Scheme

## For Minimized GHG Emissions and PX Production Cost

![Thumb_Axens_TA_Xylene-loop scheme for minimized GHG emissions_EN_2022](https://resources.axens.net/hubfs/Landing%20Pages/Resources/Technical%20Article/Thumbnails/Thumb_Axens_TA_Xylene-loop%20scheme%20for%20minimized%20GHG%20emissions_EN_2022.png)

*First published in Hydrocarbon Processing, June 2022*

 

Molecular management, energy efficiency and carbon dioxide (CO2) emissions have become major focuses for petrochemical complexes, including aromatics plants.

 

The xylene loop accounts for about two-thirds of the energy consumption and associated emissions in a modern reformate-to-paraxylene (PX) facility.

In the xylene loop, xylene vapor-phase isomerization (VPI) units carry out two chemical reactions:

- The isomerization of para-depleted xylenes to equilibrium xylenes,
- and the removal of ethylbenzene (EB) by chemical conversion.

 

EB can either be isomerized to xylenes (the EB-reforming VPI process) or dealkylated to benzene (the EB-dealkylation VPI process).

 

With reformate C8 aromatic cuts containing up to 18% EB, converting EB to benzene or xylene has a significant impact on the total PX vs. benzene production.

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