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| | Silica gel Basic information |
| Product Name: | Silica gel | | Synonyms: | Silica gel GF Pre-coated Plate for TLC;High Silica gel HF254 Pre-coated Plate for TLC;Silica gel H Pre-coated Plate for TLC;AEROSIL(TM) 200;Silica gel G Pre-coated Plate for TLC;High Silica gel GF Pre-coated Plate for TLC;silica,amorphous,precipitatedandgel;silicagel,pptd.,cryst.-free | | CAS: | 112926-00-8 | | MF: | O2Si | | MW: | 60.0800018310547 | | EINECS: | 601-214-2 | | Product Categories: | Silica TLC Adsorbent, with fluorescent indicator, no binder;Silica Gels;Adsorbents (Inorganic);LPLC Separation Media;Davisil SilicaEssential Chemicals;Resins&LC Separation Media;UVCBs-inorganic;Silica;Silica Gels;metals scavenging agent;supported alkali metal;Desiccators and Desiccants;Desiccants;Labware;Davisil GradesResins&LC Separation Media;Davisil Silica;Essential Chemicals;Silica TLC Adsorbent, no binder, no fluorescent indicator;Silica TLC Adsorbents;SilicaBulk Adsorbents for TLC;Fluka brand Silica, TLC AdsorbentBulk Adsorbents for TLC;Silica TLC Adsorbent, with binder, no indicator;Bulk Adsorbents for TLC;Other Silica Gels;Fluka brand Silica, TLC Adsorbent | | Mol File: | Mol File | ![Silica gel Structure]() |
| | Silica gel Chemical Properties |
| Melting point | 1610°C | | Boiling point | 2230℃ | | density | 2.6 | | Fp | 23°C | | storage temp. | 2-8°C | | form | powder or granules | | Specific Gravity | 0.88g/ml | | color | blue | | PH | ~6.8 (10% in aq. suspension) | | Odor | Odorless | | PH Range | About 7.0 | | Water Solubility | Insoluble in water | | Hydrolytic Sensitivity | 6: forms irreversible hydrate | | Merck | 14,8493 | | CAS DataBase Reference | 112926-00-8 | | EPA Substance Registry System | Silica gel, pptd., cryst.-free (112926-00-8) |
| | Silica gel Usage And Synthesis |
| Chemical Properties | white to off-white powder | | Chemical Properties | Amorphous silica, the noncrystalline form of SiO2, is a transparent to gray, odorless, amorphous powder | | Uses | Silica gel was used on glass plates for preparative TLC and on aluminium sheets for analytical TLC. Silica gel was used in vacuum chromatography and TLC. Silica gel was used in column chromatography. | | Uses | Silica Gel, 40-63 Micron Particles (cas# 112926-00-8) is a compound useful in organic synthesis. | | Uses | Silica gel was used to compare MCM-41 type mesoporous adsorbents. | | Definition | A gel made by coagulating
sodium silicate sol. The gel is dried by heatheating
and used as a catalyst support and as a
drying agent. The silica gel used in desiccators
and in packaging to remove moisture
is often colored with a cobalt salt to indicate
whether it is still active (blue=dry;
pink=moist). | | Definition | A rigid gel made by coagulatinga sol of sodium silicate andheating to drive off water. It is usedas a support for catalysts and also asa drying agent because it readily absorbsmoisture from the air. The gelitself is colourless but, when used indesiccators, etc., a blue cobalt salt isadded. As moisture is taken up, thesalt turns pink, indicating that thegel needs to be regenerated (by heating). | | General Description | Silica gel is a rigid 3D network of colloidal silica. It is exclusively used as a support material for the active titanium(III) centers in Ziegler-Natta catalysts. Silica gel allows a controlled fragmentation lresulting in the formation of uniform polymer particles with narrow particle size distribution and high bulk density. Silica gel is classified as below:
a. Aquagel - pores are filled with water
b. Xerogel - by the process of evaporation, aqueous phase in the pores are removed
c. Aerogel - solvent removed by supercritical extraction | | Agricultural Uses | A hard granular hygroscopic form of hydrated silica is
called silica gel. It is made by heating a coagulated sol of
sodium silicate. It is used as a catalyst and a desiccant. | | Potential Exposure | Amorphous fumed silica is used as a mineral, natural or synthetic fiber. A potential danger to those involved in the production and handling of fumed silica for paint pigments or catalysts. Diatomaceous earth is used in clarifying liquids, in manufacture of fire brick and heat insulators; used as a filtering agent; as a filler in construction materials; pesticides, paints, and varnishes. A potential danger to those involved in mining of diatomaceous earth or fabrication of products there from. | | Purification Methods | Before use as a drying agent, silica gel is heated in an oven, then cooled in a desiccator. Conditions in the literature range from heating at 110o for 15hours to 250o for 2-3hours. Silica gel has been purified by washing with hot acid (in one case successively with aqua regia, conc HNO3, then conc HCl; in another case it was digested overnight with hot conc H2SO4), followed by exhaustive washing with distilled water (one week in a Soxhlet apparatus has also been used), and prolonged oven drying. Alternatively, silica gel has been extracted with acetone until all soluble material was removed, then dried in a current of air, washed with distilled water and oven dried. Silica gel has also been washed successively with water, M HCl, water, and acetone, then activated at 110o for 15hours. Silicon monoxide [10097 -28 -6] M 44.1, m > 1700o, d 4 2.18. Purify the monoxide by sublimation in a porcelain tube in a furnace at 1250o (4hours) in a high vacuum (10-4mm) in a stream of N2. It is obtained as brownish black scales. [Schenk in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 696 1963.] | | Incompatibilities | Silica, amorphous is a noncombustible solid. Generally unreactive chemically. Incompatible with fluorine, oxygen difluoride, chlorine trifluoride. Soluble in molten alkalis and reacts with most metallic oxides at high temperature. | | Waste Disposal | Sanitary landfill. |
| | Silica gel Preparation Products And Raw materials |
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