High Absorption Powder Silica Gel for Column-layer Chromatography

Silica Gel for Column-layer Chromatography

Characteristics:
White grains of homogeneous size. Chief ingredient is silicon dioxide. Of high purity. Secure and sanitary. Can be used to separate and refine mixed components because different absorption duration on this silica gel. 

Use:
For refinement of petrol products, removal of aromatic hydrocarbon material, separation and refinement of traditional Chinese herbal medicine components, preparation of high purity substance, etc.  

Silica gel is a kind of high-active absorbing material, which is generally obtained by reaction of sodium silicate and sulfuric acid together with aging, acidic soaking and other series of post-processing. Silica gel belongs to amorphous substance and its chemical formula is mSiO2 . H2O. With stable chemical property, it won't burn and won't dissolve in any solvent except for alkali and hydrofluoric acid. Silica gels of various models form different fined-pore structures owing to different manufacturing methods. Additionally, the chemical components and physical structure of silica gel determine that silica gel owns many characteristics which can't be substituted by other materials of same kind, such as high absorption performance, excellent thermal stability, stable chemistry, high mechanical strength and others.

According to the size of pore diameter, silica gel can be classified into m acro -pored silica gel, coarse-pored silica gel, B-type silica gel and fine-pored silica gel. Owing to different pore structures, their absorption performances are various and own different characteristics. Coarse-pored silica gel owns higher absorbing capacity under high relative humidity, fine-pored silica gel owns higher absorbing capacity than coarse-pored silica gel under lower relative humidity, and B-type silica gel owns absorbing capacity which is between coarse-pored and fine-pored silica gel owing to its pore structure is between coarse-pored and fine-pored silica gel. In addition, m acro -pored silica gel is generally used as catalytic agent carrier, delustering agent, toothpaste abrasive. Therefore, we should select different varieties according to different purposes.

Safety Performance

The main component of silica gel is silicon dioxide, which owns stable chemistry and won't burn. As silica gel is a kind of amorphous substance, the dust content in workshop should be controlled below 10mg/sq.m. In addition, the ventilation should be enhanced and the operators should wear when operating.

Owning powerful absorbing capacity, silica gel has drying effect on human's skin. Therefore, the operators should wear working clothes when operating. If silica gel accidentally enters into eyes, please wash with a great of water and then go to hospital as soon as possible.

Owing to containing a little cobalt chloride, b lue silica gel is poisonous. Therefore, it should avoid to contacting food and being sucked into mouth. If poisoning event occurs, please go to hospital for treatment immediately.

During using process, silica gel absorbs water vapor or other organic substance in medium and its absorbing capacity decreases accordingly. However, it can be repeatedly used after being regenerated.

I Regeneration after silica gel absorbing water vapor

After silica gel absorbing moisture, the moisture can be removed through thermal desorption . The heating methods are various, such as electrothermal furnace , flue waste heat heating and hot air drying, etc.

The temperature of desorption heating is controlled between 120 ℃ and 180 ℃ . For blue gel indicator, allochroic silica gel and DL type blue silica gel, the temperature should be controlled between 100 ℃ and 120 ℃. During the regeneration of industrial silica gel of various kinds, the maximum temperature should not be higher than below limit:

For coarse-pored silica gel, it should not be higher than 600 ℃;

For fined-pored silica gel, it should not be higher than 200 ℃ ;

For blue gel indicator (or allochroic silica gel), it should not be higher than 120 ℃ ;

For alumino silica gel, it should not be higher than 350 ℃ .

For silica gel after being regenerated, its moisture should be controlled below 2% for repeated operation.

II Regeneration after silica gel absorbing organic impurities

•  Baking Method

For coarse-pored silica gel, it can be placed in baking furnace to rise to 500 ℃ to 600 ℃ and the gel granules will take on white or yellow brown after 6 to 8 hours. For fine-pored silica gel, the baking temperature should not be over 200 ℃.

•  Bleaching Method

After silica gel's absorption in saturated water vapor reaching to saturation level, put silica gel into hot water for soaking and bleaching. Additionally, remove waste oil or other organic impurities in combination with detergent.

•  Solvent Washing Method

According to the variety of organic substance absorbed by silica gel, please select appropriate solvent to dissolve the organic substances absorbed in silica gel and then heat the silica gel to remove the solvent.

III Notices on Regeneration of Silica Gel

•  When drying and regenerating, please note that the temperature should be gradually raised, in order not to cause breaking of gel granule and recycle rate reduction owing to drastic drying.

•  When baking silica gel for regeneration, too higher temperature will lead to change of pore structure of silica gel and reduce its absorbing effect obviously and affect its usage value accordingly. For blue gel indicator or allochroic silica gel, the temperature of desorption regeneration should not be higher than 120 ℃ , otherwise, the coloration effect will be lost owing to oxidation of coloring agent.

•  For regenerated silica gel, it is generally to screen the fine granules to make the granules equal and even.

Storage and Packing

Silica gel owns excellent moisture absorption capacity, so it should be stored in dry place, and a rack is required between packing materials and the ground. The packing materials include steel bucket, paper bucket, paper carton, plastic bottle, polyethylene plastic composite bag, flexible container, etc. Concrete packing specification refers to classified production introduction.

During transportation, silica gel should be prevented from rain, damp and solarization.

We have the following Silica gel:
1. Narrow pore silica gel, type A
2. Type-b silica gel
3. Wide pore silica gel, type C
4. Big wide pore silica gel
5. Super wide pore silica gel
6. Column chromatography silica gel
7. TLC (thin layer chromatography) silica gel
8. TLC silica gel plate
9. HPLC (High performance liquid chromatography) silica gel
10. Silica gel for beer
11. Fng water-proof silica gel (non-crack-up when it is put into water)
12. Silica acid
13. Active silica gel
14. Silica sol
15. Silica gel desiccant, silica gel sachet, silica gel bag: 0.5g, 1g, 2g, 3G, 4G, 5g, 10g, 20g, 30g, 50g, 100g, 500g, 1000g, etc.
16. High performance desiccant
17. Container use silica gel desiccant
18. Flowers drying desiccant
19. High performance & recycling cat litter
20. Cat litter
21. Changing color/indicator silica gel
22. Colorful silica gel
23. Fragrant silica gel
24. Blue silica gel
25. Orange silica gel
26. Toothpaste use silica gel
27. Cosmetic use silica gel
28. Edible additive silica gel
29. Silica Alumina Gel
30. Silica gel for construction material
31. Silica gel for insulator material
32. Silica gel tablet

Please tell us your exact specification, packing and order quantity.
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To get more information, just feel free to contact with us. Thanks.
Mr. Liu

Skype: +86-13969713726