Method for producing variable-pressure adsorption silica gel

Abstract

The invention discloses a method for producing a silica gel used for pressure swing adsorbing, characterized that the method comprises the following steps: preparing sodium silicate and concentrated sulfuric acid into dilute solutions which are enhancing mixed to perform neutralization reaction, thus aquagel are obtained; aging the aquagel by acid soaking and water washing for second times, whereby the silica gel after water washed secondly has acid content of 0.008-0.015%; and fishing out the silica gel water washed secondly after saturated with static water, drying the gel firstly, and then secondly drying the screened silica gel after dried firstly, wherein the second drying is performed on a vibrational fluidized bed rapidly in short time, wherein, the water content is controlled within 2%, finally, a product is prepared. The invention has advantages of higher specific surface area, stable chemical property, no poison and no smell, with strong adsorption capacity for carbon dioxide and water vapour, etc.

Description

Technical field: [0001] The invention relates to a production method of silica gel, in particular to a production method of silica gel for pressure swing adsorption. Background technique: [0002] At present, there are many varieties of silica gel on the market, mainly including: A-type silica gel, B-type silica gel, C-type silica gel, etc. All kinds of silica gel are divided into various specifications: 1-3mm, 1-4mm, 3-5mm, etc., among which A Type A silica gel mainly (A type silica gel to CO 2 The adsorption capacity is higher than that of B-type and C-type), A-type silica gel for CO 2 The adsorption capacity of A-type silica gel is 13ml / g. The production method of A-type silica gel is: make the prepared qualified raw materials into hydrogel, after aging, acid treatment, water washing, glue removal, drying, screening, and finished products. ; Type A silica gel is used in the dehumidification and drying of precision instruments, industry, medicine, food, clothing, shoes a...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many varieties of silica gel on the market, mainly including: A-type silica gel, B-type silica gel, C-type silica gel, etc. All kinds of silica gel are divided into various specifications: 1-3mm, 1-4mm, 3-5mm, etc., among which A Type A silica gel mainly (A type silica gel to CO 2 The adsorption capacity is higher than that of B-type and C-type), A-type silica gel for CO 2 The adsorption capacity of A-type silica gel is 13ml / g. The production method of A-type silica gel is: make the prepared qualified raw materials into hydrogel, after aging, acid treatment, water washing, glue removal, drying, screening, and finished products. ; Type A silica gel is used in the dehumidification and drying of precision instruments, industry, medicine, food, clothing, shoes and hats, and daily necessities, etc., and can basically achieve the effect of moisture absorption. Type A silica gel to CO 2 The adsorption capacity is far below the design requirements of the pressure swing adsorption device, which greatly shortens the service life of the pressure swing adsorption device and brings great economic losses to users, so it cannot meet the requirements of the majority of users.