Search

CN-121534674-B - Silicon-based solid amine honeycomb adsorbent and preparation method thereof

CN121534674BCN 121534674 BCN121534674 BCN 121534674BCN-121534674-B

Abstract

The invention provides a silicon-based solid amine honeycomb adsorbent and a preparation method thereof. The preparation method of the silicon-based solid amine honeycomb adsorbent comprises the following steps of modifying organic gel in a nonpolar solvent, modifying the organic gel and a first coupling agent to obtain modified organic gel, preparing slurry, mixing silicon-based solid amine powder with water, adding a first dispersing agent and a defoaming agent, stirring uniformly, sequentially adding the modified organic gel and the inorganic gel, stirring uniformly to obtain silicon-based solid amine slurry, constructing a film forming system, adding a film forming agent and a second dispersing agent into the silicon-based solid amine slurry, stirring to construct a film forming system, and loading the film forming system on a glass fiber substrate to obtain the silicon-based solid amine honeycomb adsorbent. The invention realizes the uniform dispersion of the silicon-based solid amine powder in the slurry through the synergistic stabilization effect of the film forming agent and the dispersing agent, and provides a feasible scheme for the low-cost and large-scale preparation of the high-performance solid amine coating module.

Inventors

  • ZHANG ZUOTAI
  • HE CHENGKUN
  • PENG XIONG
  • XU JIYUN

Assignees

  • 深碳科技(深圳)有限公司

Dates

Publication Date
20260505
Application Date
20260119

Claims (7)

  1. 1. The preparation method of the silicon-based solid amine honeycomb adsorbent is characterized by comprising the following steps of: Modifying the organic glue, namely modifying the organic glue and a first coupling agent in a nonpolar solvent to obtain a modified organic glue; the organic glue comprises one or more of epoxy resin, acrylic ester, polyvinyl alcohol, polyurethane, phenolic resin and polyvinylpyrrolidone; the first coupling agent comprises one or more of an aminosilane coupling agent, an epoxy silane coupling agent and a methacryloxy silane coupling agent; The mass ratio of the organic adhesive to the first coupling agent to the nonpolar solvent is (1-5): 1-10): 10-50; the preparation of slurry, namely mixing the silicon-based solid amine powder with water, adding a first dispersing agent and a defoaming agent, and uniformly stirring; the silicon-based solid amine powder is obtained by modifying silicon dioxide through organic amine, and the carrier of the silicon-based solid amine powder is silicon dioxide; The first dispersing agent comprises one or more of sulfate, phosphate, cellulose derivative, polyethylene glycol and silicone oil; The inorganic adhesive comprises one or more of neutral silica sol, tetraethoxysilane, titanium tetraisopropoxide and aluminum isopropoxide; The silicon-based solid amine slurry comprises, by mass, 40-60 parts of silicon-based solid amine powder, 100-160 parts of water, 10-20 parts of a first dispersing agent, 0.1-1 part of a defoaming agent, 0.5-10 parts of modified organic adhesive and 1-20 parts of inorganic adhesive; the construction of a film forming system, namely adding a film forming agent and a second dispersing agent into the silicon-based solid amine slurry, and stirring to construct the film forming system; The film forming agent comprises one or more of 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, ethylene glycol phenyl ether, dibutyl phthalate, dipropylene glycol butyl ether, isobutyl isobutyrate, dioctyl adipate, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, tripropylene glycol butyl ether, diethylene glycol butyl ether acetate and triethyl citrate; the second dispersant comprises one or more of sulfate, phosphate, cellulose derivative, polyethylene glycol and silicone oil; the mass ratio of the film forming agent to the second dispersing agent is (1-10) (20-40); the substrate loading, namely loading the film forming system on a glass fiber substrate to prepare a silicon-based solid amine honeycomb adsorbent; the glass fiber matrix is a modified glass fiber matrix; The preparation process of the modified glass fiber matrix comprises the steps of carrying out plasma treatment on the glass fiber matrix, then soaking the glass fiber matrix in an ethanol aqueous solution containing a second coupling agent, air-drying and vacuum-drying to obtain the modified glass fiber matrix; The second coupling agent comprises one or more of an aminosilane coupling agent, an epoxy silane coupling agent and a methacryloxy silane coupling agent.
  2. 2. The method for preparing a silica-based solid amine honeycomb adsorbent according to claim 1, wherein the particle size of the silica-based solid amine powder is 0.30-0.60mm; The pore volume of the silicon dioxide is larger than 1.5 cm 3 /g, the specific surface area of the silicon dioxide is 150-600 m 2 /g, and the hydroxyl content of the surface of the silicon dioxide is 2-3 hydroxyl groups/nm 2 ; The mass ratio of the organic amine to the silicon dioxide is 30 (30-60).
  3. 3. The method of preparing a silica-based solid amine honeycomb adsorbent according to claim 1, wherein the defoamer comprises one or more of silicone polyether BYK-024, triacetyl phosphate, polyisoprene, AFE-1520.
  4. 4. The method of preparing a silica-based solid amine honeycomb adsorbent of claim 1 wherein the non-polar solvent comprises one or more of cyclohexane, toluene, 1, 2-dichloroethane, ethyl acetate, heptane.
  5. 5. The method for preparing the silicon-based solid amine honeycomb adsorbent according to claim 1, wherein the plasma treatment condition is that the power is 100-600W and the treatment time is 1-20min under argon atmosphere; The surface roughness Ra of the glass fiber matrix subjected to the plasma treatment is 0.5-1 mu m, and the surface hydroxyl density of the glass fiber matrix subjected to the plasma treatment is 12-15 hydroxyl groups/nm 2 .
  6. 6. The method for preparing a silicon-based solid amine honeycomb adsorbent according to claim 1, wherein the mass fraction of the second coupling agent in the ethanol aqueous solution containing the second coupling agent is 0.2% -5%, and the mass ratio of ethanol to water is (3-5): 7-5.
  7. 7. A silica-based solid amine honeycomb adsorbent prepared by the preparation method of any one of claims 1 to 6.

Description

Silicon-based solid amine honeycomb adsorbent and preparation method thereof Technical Field The invention belongs to the technical field of solid amine adsorbents, and particularly relates to a silicon-based solid amine honeycomb adsorbent and a preparation method thereof. Background Carbon dioxide is the most dominant greenhouse gas, and controlling its emissions is an urgent topic of global environmental governance. Carbon capture technology is a key means for achieving emission reduction, and currently mainly comprises a liquid amine absorption method and a solid amine absorption method. The liquid amine method has mature technology, but has the problems of high regeneration energy consumption, strong equipment corrosiveness and the like, and the solid amine adsorption method has the advantages of large adsorption capacity, good selectivity, mild operation condition, low energy consumption and the like, and is considered to have large-scale application potential. The existing solid amine adsorbent is mostly in the form of powder or particles, is used in a fixed bed or a fluidized bed, has the problems of long diffusion path, low adsorption rate and the like, and is often required to increase the bed thickness to improve the removal rate, so that the system pressure resistance is increased and the energy consumption is increased. For this reason, honeycomb coating module technology has been developed to coat solid amine powder onto structured substrates to increase material utilization efficiency and reduce piezoresistive properties. The silica-based solid amine is a composite material with silica as a carrier for loading organic amine, and has the advantages of large specific surface area of the carrier, low cost and the like. However, in the large-scale preparation process, organic amine is easy to locally aggregate due to uneven mixing to form large-particle-size particles, so that the subsequent coating process is influenced. Therefore, there is a need to develop a coating forming process suitable for large particle size silica-based solid amines. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a silicon-based solid amine honeycomb adsorbent and a preparation method thereof. Through the synergistic effect of the film forming agent and the dispersing agent, the difficult problem of dispersion stability of the silicon-based solid amine powder is solved, so that uniform coating can be realized without relying on complex pretreatment such as high-strength mechanical stirring, and a new direction is opened for preparing high-performance solid amine coating modules in a large scale at low cost. In order to achieve the above object, in one aspect, the present invention provides a method for preparing a silicon-based solid amine honeycomb adsorbent, comprising the steps of: Modifying the organic glue, namely modifying the organic glue and a first coupling agent in a nonpolar solvent to obtain a modified organic glue; the preparation of slurry, namely mixing the silicon-based solid amine powder with water, adding a first dispersing agent and a defoaming agent, and uniformly stirring; the construction of a film forming system, namely adding a film forming agent and a second dispersing agent into the silicon-based solid amine slurry, and stirring to construct the film forming system; and (3) matrix loading, namely loading the film forming system on a glass fiber matrix to prepare the silicon-based solid amine honeycomb adsorbent. Optionally, the particle size of the silicon-based solid amine powder is 0.30-0.60mm; the carrier of the silica-based solid amine powder is silica, the pore volume of the silica is larger than 1.5 cm 3/g, the specific surface area of the silica is 150-600 m 2/g, and the hydroxyl content of the surface of the silica is 2-3 hydroxyl groups/nm 2; the silicon-based solid amine powder is obtained by modifying silicon dioxide by using organic amine, wherein the mass ratio of the organic amine to the silicon dioxide is 30 (30-60). Optionally, the silicon-based solid amine slurry comprises, by mass, 40-60 parts of silicon-based solid amine powder, 100-160 parts of water, 10-20 parts of a first dispersing agent, 0.1-1 part of a defoaming agent, 0.5-10 parts of modified organic adhesive and 1-20 parts of inorganic adhesive. Optionally, the first dispersant comprises one or more of sulfate, phosphate, cellulose derivative, polyethylene glycol, silicone oil; the defoamer comprises one or more of organosilicon-polyether (BYK-024), triacetyl phosphate, polyisoprene and AFE-1520; The inorganic gel comprises one or more of neutral silica sol, tetraethoxysilane, titanium tetraisopropoxide and aluminum isopropoxide. Optionally, the organic glue comprises one or more of epoxy resin, acrylic ester, polyvinyl alcohol, polyurethane, phenolic resin and polyvinylpyrrolidone; The nonpolar solvent comprises one or more of cyclohexane, toluene, 1, 2-dichloroethane, ethyl ac