Two Manufacturing Methods
Wet Process (Slurry Process)
In the wet process, sodium bentonite is first purified by dispersing in water to form a high-solids slurry. Non-clay impurities (quartz, feldspar, carbonate minerals) that do not disperse are removed by centrifugation or sedimentation. The purified clay slurry is then reacted with the quaternary ammonium compound in an aqueous solution at 60–80°C. The organoclay product is filtered, washed, dried, and milled.
Advantages of wet process:
- Higher purity — sand and impurities removed before modification
- More complete ion-exchange reaction — better organophilic character
- Better batch-to-batch consistency
- Preferred for premium applications: high-performance coatings, cosmetics, pharmaceutical
Dry Process
In the dry process, dry-milled bentonite powder is mixed directly with molten or dissolved quaternary ammonium compound under intensive mixing. The reaction occurs in the solid/melt phase without water purification of the clay.
Advantages of dry process:
- Lower energy consumption (no drying step)
- Simpler equipment requirements
- Lower production cost
Disadvantages of dry process:
- Higher impurity content (sand, carbonate not removed)
- Less complete ion-exchange — lower organophilic character
- More variable performance
- Higher grit/coarse particle content
Which Process Does CP Organoclay Use?
CP Organoclay produces all product grades using the wet process. Our bentonite is beneficiated by aqueous slurry processing before modification, ensuring high purity and consistent organophilic character in every batch. All products are tested against API and internal quality standards before release.
Frequently Asked Questions
What is the difference between wet process and dry process organoclay?
Wet process: bentonite purified by aqueous slurry → higher purity, more complete ion exchange, better consistency. Dry process: dry bentonite mixed directly with quaternary ammonium → lower cost, but higher impurities, less complete modification, more variable performance. Wet process is preferred for coatings, cosmetics, and drilling; dry process for lower-specification applications.
Is wet process organoclay better than dry process?
Yes for most applications. At equal dosage in xylene-alkyd coating, wet-process typically achieves TI 15–25% higher than dry-process equivalents — due to higher clay purity and more complete quaternary ammonium modification. Also provides lower grit, better batch consistency, and lower heavy metal impurity levels. CP Organoclay uses wet process for all grades.
How do I tell if organoclay is wet or dry process?
Request: (1) LOI vs montmorillonite content — wet process has consistent organic modifier and high MMT; (2) Grit content — wet process has fewer coarse impurity particles; (3) Batch TI variation — wet process <5%; (4) COA showing SiO₂ and impurity mineral content. Ask supplier to confirm bentonite purification is part of their manufacturing process.
Related: Our Factory · Certifications · What is Organoclay?
