Method of manufacturing a porous composite feedstock

The stiff vacuum extrusion process transforms unsuitable feedstocks into a porous composite form, enabling their reuse in the carbochlorination process, thereby reducing costs and environmental impact in TiO2 pigment production.

WO2025195923A1 Publication Date: 2025-09-25KRONOS INTERNATIONAL INC
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Patent Information

Application Number
PCT/EP2025/057104
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-20
Filing Date
2025-03-14
Publication Date
2025-09-25

AI Technical Summary

Technical Problem

Existing carbochlorination processes face challenges in utilizing a wide variety of carbonaceous and titaniferous feedstocks due to size and moisture content limitations, leading to increased costs and environmental impact, with materials like wet petcoke and petcoke fines being unsuitable for direct reuse.

Method used

A method involving stiff vacuum extrusion of a homogeneous mixture of particulate feedstocks with a binder to form a porous composite feedstock, which is then processed to achieve desired water content, particle size, and porosity, enabling the use of previously unsuitable materials in the carbochlorination process.

Benefits of technology

The method allows for the recycling and reuse of waste materials, reducing costs and environmental impact by utilizing a broader range of feedstocks, including wet petcoke and petcoke fines, in the production of TiO2 pigment particles.

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Abstract

A method of manufacturing a porous composite feedstock as well as a porous composite feedstock for use in the carbochlorination process of making TiCl4 in a fluidized bed reactor is provided. A homogeneous mixture of one or more particulate feedstock materials and a binder are extruded using a stiff vacuum extrusion process to form an extrudate. The extrudate can then be further processed to have a desired water content, particle sizes, and / or other characteristics for use as a porous composite particulate feedstock in the carbochlorination process. The method provides the ability to use a much wider variety and sources of feedstock for use in making TiO2 pigment particles according to the carbochlorination process.
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