Clay Catalysts

BW-Clay Acid Clay Catalyst

Naturally occurring Bentonite is activated with acids. During acid activation the interlayer cations are exchanged per protons and other catalytically active cations. Metal ions like Al & Fe are leached out from octahedral layer of clay. As a result, clay becomes acidic and porous. This acid activation method is proprietary and is developed to impart complex acid catalyst properties e.g.

  • Bronsted /Lewis Acidity.
  • Number and Strength of Acid site.
  • Ion exchange sites.
  • Surface area.
  • Catalytic sites.
  • Porosity.

Functions of Clay Catalyst

Clay works bi-functionally as an acid catalyst and adsorbent. Acid catalyst nature of clay enhances the reactions involving the olefins and aromatics. These reactions are typically alkylation, isomerisation and disproportionation. As a result of alkylation reactions BrI due to olefins is reduced to desired level. The products of these reactions are in general high boiling and are seperated at later stage. Clay catalyst due to its porous nature adsorbs color precursors this improving the AWN.

What is BW-Clay?

BW-Clay is a clay catalyst. Clays are also known to act as radical catalysts. Modified smectite (swelling) clays can be very selective catalysts for a wide range of organic transformations.

BW-Clay a catalyst and adsorbent provides improved process unit economics, superior product quality and reliable performance in fixed bed purification of aromatics. Effectively removes olefins that can contaminate downstream adsorption and catalytic units. Longer bed cycles are achieved as a result of its high catalytic activity, high acidity, and unique surface chemistry. Helps meet stringent Bromine Index and Acid Wash Color product specifications. Good physical integrity minimizes particle breakdown during vessel loading and unit operations.

Abrasive Resistance

BW-Clay is a granular clay catalyst with improved resistance to attrition. According to standard test method, attrition is in the range of 1-3 %.

Applications of BW-Clay

Actal is designed for Olefin removal from BTX. BW-Clay 20X is the most efficient clay catalyst in the market for the selective removal of olefins from Benzene/Toluene and Heavy Reformate (mainly Xylenes). Other grades of BW-Clay are available for selective removal of N from Benzene feeds used in zeolite based processes for Ethyl benzene. Cumene and Phenol.

BW-Clay & Its Grades

  • BW-Clay is included in UOP duty specification for clay treating of BTX.
  • BW-Clay is a granular solid acid catalyst manufactured from high quality Ca-montmorillonite of India.
  • BW-Clay is a product designed with a highly porous inner structure. This results in accessible active site for reactants and lowers diffusion limitation for byproducts.
  • BW-Clay is developed for adsorption and acid catalyst in fixed bed reactors.

Grade & Specifications

 Units BWCLay 20X BWCLay 20 BWCLay 10
Loose Bulk Density gm/l 700±50 700±50 620±50
Free Moisture (2 hrs,110’C) % 6 max 6 max 6 max
pH (10% suspension filters) 2.5 – 3.5 2.5 – 3.5 2.5 – 3.5
Free Acidity mg KOH/gm 7 max 7 max 7 max
Total Acidity mg KOH/gm 23 – 26 20 – 23 9 – 14
Surface Area (BET) 300±30 300±30 300±30

Particle Size Distribution

The particle size distribution of BW-Clay is determined by a sieve analysis of the dry granules. The following average residues were found on different fine sieves.

Sieve range Unit Value
> 2.0 mm % 10 max
2.0 – 0.25 mm % 85 min
< 0.25 mm % 5 max

Chemical Composition

Typically BW-Clay shows the following chemical composition

Composition Unit Value
SiO2 % 59.9
Al2O3 % 13.9
Fe2O3 % 7.3
CaO % 0.8
MgO % 2.3
Na2O % 0.2
K2O % 0.1
TiO2 % 2.8
Loss on ignition % 10.04


Available Packages :
50kg and Jumbo Packing.

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