magnesium silicate Description
Manufacturer41914Shangyu Chemical Industry Corp.Molecular Formula: 2MgO.6SiO2.nH2O
CAS Number: 1343-88-0
The product is white fine powder, amorphous, with vesicular structure and huge specific area, it is an amphoteric compound capable of adsorbing either acid or alkali. It is a efficient refining and purifying agent in the production of polyether polyols for its excellent depicking, deodorizing, potassium ion adsorbing effects and function as filter medium.
It effects when the reaction of magnesium sulfate and sodium silicate occurs to remove residual catalyst impurities from polyether polyols. By adding measured quantity in the last refining procedure, it circulatingly filters the yellow-brown raw polyether to obtain colorless and transparent refined product.
Specification
SiO2, % 60-68
MgO,% 13-16
Loss on Drying (105 41446,2h),% 4143610
Particle Size(250um-125um) Min.90
pH Value 9.5-10.5
Specific Area, m2/g Min.500
Pore Volume, ml/g Min.0.6
Activity,mgKOH/g 220-241
Filtration Time(s) 50-120
SO42- ,% Max 0.50
Cl- ,% Max 0.50
Appearance: White powder with good fluidity
Packing: 20kgs in kraft paper bag.
Applications:
The crude polyols, after being blended with 5%wt of water at 80-90 for 15 minutes, are reacted with H3PO4(a little more than the crude polyols in amount) for 1 hour, with the pH value of the neutralization solution controlled between 5.0-505.At this stage, 1%wt of synthetic magnesium silicate adsorbent is added into and blended with solution while heating the temperature to 10541446-11541446. Then dehydrate the solution at the speed from slow to quick in order to make the KH2PO4 crystals well-proportionaly formed. The dehydration process ends when the moisture reaches to minimum amount e.g.0.05$wt.The filtering circulation follows and continues for 1hour at the temperature of 10541446--11541446, pressure at 2-4Kpa. Analyze the content of K+(NA+). Filtration begins when the content of K+(Na+) is less than 3ppm. The filtered liquor is the finished products.
