7631-86-9 Usage
Description
Silicon dioxide, also known as silica, is one of the most important and abundant oxides on Earth, constituting about 60% of the Earth's crust as silica itself or in combination with other metal oxides in silicates. It commonly occurs as sand in ocean and river shores, deserts, rocks, and minerals, and exists in several structural forms, including polymorphic crystalline silica, synthetic quartz crystals, amorphous silica, and vitreous silica.
Uses
Used in Food Industry:
Silicon dioxide is used as an ant-caking agent in powdered foods, such as salt and many spices, preventing the ingredients from binding together.
Used in Nutritional Health Food Supplements:
Silicon dioxide serves as a source of silicon, which helps maintain healthy strong bones and joints and minimizes aluminum effects on the body.
Used in Wine, Beer, and Juice Industry:
It acts as a fining agent in the clarification of wines, beers, and juices.
Used in Chemical Manufacture:
Silicon dioxide is used as a raw material in the manufacture of silicon compounds and sodium silicate.
Used in Construction:
It is a raw material in the production of portland cement.
Used in Sand Casting:
Silicon dioxide serves as the main ingredient due to its high melting point.
Used in Glass Industry:
It is a raw material for high purity silica glass, offering high temperature and corrosion resistance.
Used in Domestic Glass and Optical Devices:
Silicon dioxide is an essential component in these applications.
Used in Ceramics:
It is a main constituent in the manufacture of ceramic glaze, forming glass when heated to bind other ingredients together.
Used in Metallurgy:
Silicon dioxide is used as a raw material or additive in the manufacture of silicon alloys.
Used in Pharmaceutical Industry:
It functions as a flow agent in drug tablet making, aiding powder flow when tablets are formed.
Used in Electronics:
Silicon dioxide is used as a raw material in the production of fiber optic cables, offering high levels of heat conductivity and low rates of transmission loss. It is also used in wire insulation due to its high melting point and good insulating properties, and as a source of silicon in semi-conductors and piezoelectric transducers.
Used in Others:
Silicon dioxide is a main component in refractory materials, rubber and plastics as an additive, silica gel manufacturing, defoaming, and as a thickening agent in hydraulic fracturing.
Used in Agricultural Applications:
Silicon dioxide is used as a filler in fertilizers and in the manufacture of glass, ceramics, abrasives, rubber, and cosmetics.
Hazard
Not toxic if ingested, inhaled silica dust can
cause silicosis; carcinogen.
Safety Profile
The pure unaltered form is considered a nuisance dust. Some deposits contain small amounts of crystahne quartz and are therefore fibrogenic. When diatomaceous earth is calcined (with or without fluxing agents) some sdica is converted to cristobalite and is therefore fibrogenic. Tridymite has never been detected in calcined batomaceous earth. See also other silica entries
Check Digit Verification of cas no
The CAS Registry Mumber 7631-86-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,3 and 1 respectively; the second part has 2 digits, 8 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 7631-86:
(6*7)+(5*6)+(4*3)+(3*1)+(2*8)+(1*6)=109
109 % 10 = 9
So 7631-86-9 is a valid CAS Registry Number.
InChI:InChI=1/O2Si/c1-3-2
7631-86-9Relevant articles and documents
Development of Highly Active Silica-Supported Nickel Phosphide Catalysts for Direct Dehydrogenative Conversion of Methane to Higher Hydrocarbons
Dipu, Arnoldus Lambertus,Nishikawa, Yuta,Inami, Yuta,Iguchi, Shoji,Yamanaka, Ichiro
, p. 199 - 212 (2021/04/19)
The direct dehydrogenative conversion of methane (DCM) to higher hydrocarbons was investigated over silica-supported nickel phosphide catalysts (NixPy/SiO2) over 1023?K. NixPy/SiO2 catalysts were prepared by precipitation method to promote formation of nickel phosphide (Ni2P) as an active phase for the DCM reaction. Characterization studies of the NixPy/SiO2 catalysts with different P/Ni molar ratios were conducted by a X-ray diffraction analysis, a H2-temperature-programmed reduction spectrum, a scanning electron microscopy image, a X-ray absorption spectroscopy and a N2-adsorption measurement. Catalytic activity tests for the DCM reaction were conducted using a conventional fixed-bed reactor. Products of C2H4 (ethylene), C2H6 (ethane), C2H2 (acetylene), C3H6 (propylene), C6H6 (benzene), C7H8 (toluene), C10H8 (naphthalene) and H2 were analyzed by GC-TCD and GC-FID instruments. Different degrees of the Ni2P phase and character were observed for the NixPy/SiO2 catalysts from characterization studies. Data from characterization studies indicated that smaller and dispersed Ni2P particles were obtained by precipitation method as compared to that of impregnation method. NixPy/SiO2 with a molar ratio of P/Ni = 3.0 showed optimum catalytic performance with 3.28% of methane conversion, 1.93% of total product yield, and 60% of selectivity to hydrocarbons. The experimental results of the effects of reaction temperatures on the product distributions and activation energies indicated that the Ni2P phase successfully activated the C–H bond of methane and selectively converted to ethane. Ethane thermally converted to other higher hydrocarbons in the gas phase without the participation of the catalyst. Graphic Abstract: [Figure not available: see fulltext.].
Non-Cryogenic, Ammonia-Free Reduction of Aryl Compounds
-
, (2022/03/31)
A method of reducing an aromatic ring or a cyclic, allylic ether in a compound includes preparing a reaction mixture including a compound including an aromatic moiety or a cyclic, allylic ether moiety, an alkali metal, and either ethylenediamine, diethylenetriamine, triethylenetetramine, or a combination thereof, in an ether solvent; and reacting the reaction mixture at from ?20° C. to 30° C. for a time sufficient to reduce a double bond in the aromatic moiety to a single bond or to reduce the cyclic, allylic ether moiety.
COMPOUND FOR INHIBITING PGE2/EP4 SIGNALING TRANSDUCTION INHIBITING, PREPARATION METHOD THEREFOR, AND MEDICAL USES THEREOF
-
, (2022/03/14)
A compound of formula (I), a preparation method therefor, a pharmaceutical composition containing a derivative thereof, and the therapeutic uses thereof, especially inhibiting PGE2/EP4 signalling transduction and the uses thereof for treating cancer, acute or chronic pain, migraine, osteoarthritis, rheumatoid arthritis, gout, bursitis, ankylosing spondylitis, primary dysmenorrhea, tumour or arteriosclerosis.
