Preparation method of methane adsorption silica gel
A technology of silica gel and methane, which is applied in the field of preparation of adsorbed silica gel. It can solve the problems of inability to effectively adsorb methane gas and limited methane adsorption capacity, and achieve the effects of stable microporous skeleton structure inside silica gel, reduced wear rate, and shortened aging time.
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[0023] A method for preparing methane-absorbing silica gel. By changing the physical and chemical properties and specific surface area of silica gel, the adsorption capacity of silica gel to methane is changed. The specific steps are as follows:
[0024] (1) The sodium silicate solution and the dilute sulfuric acid solution are mixed intensively and neutralized to form a hydrogel;
[0025] (2) Inorganic matter that reduces the pH value of the aged water is added to the aging water, and the inorganic matter is any one of hydrochloric acid, nitric acid, and glacial acetic acid, and the hydrogel is aged, and the aging time is 2-3 minutes;
[0026] (3) The aged hydrogel is acid-treated in 4-6% sulfuric acid solution for 8-10 hours;
[0027] (4) washing the acid-treated gel once with a water washing temperature of 30-45° C., and the acid content at the end of the first washing is reduced from 0.06% to 0.03% after aging without adding inorganic substances;
[0028] (5) After the ...
Embodiment 1
[0032] No inorganic substances are added to the aging water after gel making, and water washing is carried out after aging. The acid content at the end of the first washing reaches 0.06%, and the second washing is carried out. The acid content at the end of the second washing reaches 0.015%, and the specific surface area of silica gel can reach 703m 2 / g, the methane gas adsorption capacity reaches 7.2ml / g.
Embodiment 2
[0034] Add any one of PH2 hydrochloric acid, nitric acid, and glacial acetic acid to the aging water after rubber making for aging. The aging time is 3 minutes. After aging, wash with water. The acid content at the end of the first washing reaches 0.04%. The acid content reaches 0.018%, and the specific surface area of silica gel can reach 780m 2 / g, the methane gas adsorption capacity reaches 13.5ml / g.
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