Description

• Magnesium silicate is an amorphous porous material with a white solid particle appearance and excellent fluidity.
• As an amphoteric adsorbent, it has been extensively used in the aftertreatment of polyether polyol to remove K⁺ (Na⁺ ) ion, acid, alkali, pigments, and odorous compounds containing sulfur and nitrogen atom.

Technical Information of Magnesium Silicate

Packaging, Storage and Transportation

• The packaging bag is made of outer coated paper with an inner plastic lining, with a net weight of 20kg per bag. 
• Bulk transportation arrangements will be according to specific requirements.

• This product should be stored in a cool, dry, and clean area, focusing on moisture prevention. After opening the bag, any unused product should be sealed.

Usage and Adsorption Process

In the polymerization reaction of polyether polyols, potassium hydroxide is commonly used as a catalyst. The potassium ions present in the crude polyether polyol produced after the completion of the polymerization reaction must undergo a series of post-treatment processes including hydrolysis, neutralization with phosphoric acid, adsorption with silicates (such as magnesium silicate, magnesium aluminosilicate, aluminosilicate, etc.), vacuum dehydration, and filtration for purification, ultimately yielding a polyether polyol product that meets the required specifications.

Place the crude polyether polyol into a refining kettle, and add 1% to 5% (w/w) of water to the kettle at a certain temperature (around 80°C). Thoroughly stir the mixture and neutralize the pH of the material to 4 to 6 using 85% phosphoric acid, with the neutralization temperature generally controlled to be less than 80°C. After neutralization, add 0.1% to 0.5% (by weight of the polyether polyol) of magnesium silicate/magnesium aluminosilicate adsorbent (or a mixed adsorbent of magnesium silicate and aluminosilicate in a 1:1 ratio (w/w)). Raise the temperature to an appropriate level (e.g., 110±5°C) for vacuum dehydration. Control the dehydration rate and perform hot material circulation filtration (e.g., at 110±5°C and a pressure of 2 to 4 KPa). When the moisture content reaches the required level (e.g., less than 0.1%) and the concentration of K⁺(Na⁺) ions in the filtrate meets the specified requirements, collect the clear and transparent filtrate to obtain a qualified polyether polyol product.

Download Product Brochure

201-Polyether Refined Adsorbent Product Introduction.pdf

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