Preparation for orthosilicic acid

Abstract

The invention relates to a method for preparing orthosilicic acid, the chemical formula of orthosilicic acid is H4SiO4. The method is characterized by the following steps: A, SiO2 and water are mixed according to the weight ratio of 10-20:100 and strongly stirred and NaOH or KOH solution is dropped until the pH value reaches 8-9 below the temperature of 15 DEG C; B, under strong stirring, the mixture is oil-bath heated until the temperature comes to 50-55 DEG C and reacts for 2-3 hours to obtain even solution; C, the solution is cooled to room temperature and under strong stirring, CO2 gas is fed into the even solution until the pH value is less than or equal to 4; D, choline chloride is added, wherein the weight ratio of choline chloride and the solution obtained from the step C is 20-45:100, then stirred for 10-20 minutes to obtain stable orthosilicic acid solution, wherein, the silicon content of the stable orthosilicic acid solution is 2-2.5 percent. The method of the invention has low cost to prepare orthosilicic acid, environmentally friendly preparation technique and no hazardous and noxious substances discharging during the preparation process; the orthosilicic acid solution obtained has the advantages of multifunction and long preservation time.

Description

technical field [0001] The invention relates to a preparation method of orthosilicic acid. Background technique [0002] Silicon is thought to be important for the formation and maintenance of connective tissue, and for the mineralization of bone, so silicon is essential for the normal development of bone and connective tissue. [0003] Silicon in the form of orthosilicic acid for Al +3 ions have a high affinity and favor Al +3 Elimination of ions. It therefore reduces the toxic effects of aluminum on the bones and brain. [0004] These data suggest that it is very useful to supplement silicon in time during the biological growth period, especially in the pathological state. [0005] The main problem with the metabolism of silicon is that it is difficult to absorb. Although silicon is a very abundant element, it exists naturally in the form of water-insoluble inorganic salts or amorphous clay. Silicon in this natural form cannot be absorbed by living things. absorbed. ...

AI Technical Summary

Problems solved by technology

[0008] monomeric orthosilicic acid in solution until a concentration of approximately 10 -4 Mol / L is relatively stable; however, when the concentration increases, H 4 SiO 4 Molecular association to form oligomers and polymers of orthosilicic acid, eventually forming colloidal solutions or silica gels with little or no water solubility, with reduced bioavailability of silicon

[0009] The existing method of producing orthosilicic acid with higher concentration is to mix highly acidic hydrochloric acid with acid-hydrolyzable silicon compounds, prepare orthosilicic acid through hydrochloric acid, and use the strong acidity of hydrochloric acid to maintain a low degree of polymerization of orthosilicic acid , increase the stability of orthosilicic acid, the disadvantage of this preparation method is that hydrochloric acid is a volatile acid, and the volatilized gas HCl is a toxic gas, which is not conducive to environmental protection

[0010] The existing methods for preparing orthosilicic acid generally use glycerin as a stabilizer. This method has the disadvantages of short shelf life of orthosilicic acid solution, easy oil consumption, and aging.