Process and apparatus for acylation of scroll hydroxylated materials

The chromatogenic acylation process optimizes reaction conditions by maintaining fatty acid chloride at saturated vapor pressure in a heated gas atmosphere, addressing inefficiencies in existing methods to produce hydrophobic and water-impermeable acylated materials for industrial applications.

JP7765103B2Active Publication Date: 2025-11-06CELLULOTEC INC
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Patent Information

Application Number
JP2023555861
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-12-01
Publication Date
2025-11-06
Estimated Expiration
2040-12-01

AI Technical Summary

Technical Problem

Existing acylation processes, such as those described in WO 2012/066015, fail to produce substrates with optimal hydrophobicity and water impermeability, as they inefficiently utilize fatty acid chlorides due to the entrainment of gaseous reagents by air knives, leading to poor reaction outcomes.

Method used

A chromatogenic acylation process and apparatus that maintains fatty acid chloride at a partial pressure equal to its saturated vapor pressure in a heated gas atmosphere, using a countercurrent gaseous stream to entrain hydrochloric acid while optimizing reaction conditions through controlled parameters like temperature, scroll speed, and composition flow.

Benefits of technology

The process achieves acylated materials with enhanced hydrophobicity and water-impermeability, suitable for industrial-scale production of breathable and decontamination filtration papers, by ensuring optimal reaction conditions and minimizing fatty acid chloride loss.

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Abstract

The present invention relates to a process for the acylation of a solid material having accessible hydroxyl groups (-OH), known as reaction product hydroxyls, known as hydroxylated material (30), capable of reacting with at least one fatty acid chloride (29) in gaseous form, which is scrolled through a chamber, known as acylation chamber (5), which defines an interior space under a gaseous atmosphere. The invention also relates to an acylation apparatus for carrying out the process.
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Citation Information

Patent Citations

  • Treatment methods for rendering solid materials hydrophobic, obtained materials and applications

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  • Surface coating hydroxylated by vapor phase grafting

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  • Continuous coating method for cellulosic fibrous substrate webs using fatty acid chlorides

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  • Method for hydrophobizing cellulosic substrates by utilizing fatty acid halides

    JP2022507536A