---
title: Case Study - Enhancing Diesel Hydrotreater Capacity and Reducing CO2 Emissions
description: Axens offers advanced heat integration with spiral tube exchangers and electric heaters, reducing emissions, energy use, and enabling zero-carbon operations.
image: https://resources.axens.net/hubfs/Landing%20Pages/Resources/Case%20Study/Thumbnails/Thumb_CS_Axens-Article%20NARTC%202025%20Conference%20Newspaper.jpg
---

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 Case study

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## Practical case study: Enhancing diesel hydrotreater capacity and reducing CO2 emissions

In the pursuit of emission reductions and sustainable growth, Axens Group, through its business lines Heurtey Petrochem Solutions and Nectis (a joint venture between ZPJE and Axens), offers a flow scheme with advanced technology equipment. For process unit heat integration, traditional shell-and-tube exchangers are replaced by high-efficiency spiral tube heat exchangers (STHE) distributed by Nectis. This reduces heat consumption in fired heaters and decreases energy use in compressors and pumps due to its low-pressure drop. Additionally, in facilities with access to an electrical source, replacing process fired heaters with electric tubular radiant heaters from Heurtey Petrochem Solutions enables zero carbon emissions at the unit level.

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