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Preparation method for lithium silicate CO2 adsorbent

A technology of CO2 and lithium silicate, applied in the direction of silicate, alkali metal silicate, chemical instruments and methods, etc., can solve the problems of failure to effectively improve lithium silicate adsorbent, prolongation of adsorption-regeneration cycle process, and adsorption rate Low-level problems, to achieve the effect of simple operation, simple preparation process and sufficient reaction

Inactive Publication Date: 2015-10-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] In the existing reports, the three preparation methods still failed to effectively improve the lithium silicate CO 2 The performance of the adsorbent; due to the low CO of the prepared adsorbent 2 The adsorption rate is lower at the concentration, which is lower than that of pure CO 2 The rate under the atmosphere is 3 to 4 times lower, resulting in a prolonged adsorption-regeneration cycle process (more than 90min), which is not effective in practical applications

Method used

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  • Preparation method for lithium silicate CO2 adsorbent
  • Preparation method for lithium silicate CO2 adsorbent
  • Preparation method for lithium silicate CO2 adsorbent

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preparation example Construction

[0032] A lithium silicate CO 2 The preparation method of adsorbent comprises the following steps:

[0033] (1) Dissolving the organolithium salt and the silica sol, stirring at normal temperature or while heating over fire until the solvent is evaporated to dryness; the method of heating over fire can be a water bath or an oil bath.

[0034] (2) In air or other oxygen-containing atmospheres, the evaporated solids are calcined in a muffle furnace at 550°C to 1200°C to obtain the desired lithium silicate CO 2 Adsorbent; in this process, organolithium salts are oxidized to lithium carbonate, which reacts with silica to form lithium silicate.

[0035] Wherein, the stoichiometric ratio of lithium in the organolithium salt to silicon dioxide in the silica sol is 4.0˜10:1. The content of silicon dioxide in the sol can be calculated by the mass fraction of silicon dioxide; sometimes the purity of organic lithium salt reagents is uncertain, and the content of lithium can be calculate...

Embodiment 1

[0038] (1) Taking the preparation of 5g lithium silicate as standard, 2LiCH 3 COO+4O 2 → Li 2 CO 3 +3CO 2 ↑+3H 2 O↑, and 2Li 2 CO 3 +SiO2 2 → Li 4 SiO 4 +2CO 2 The reaction formula of ↑ calculates that the mass of required silicon dioxide is 2.51g, and the mass of required lithium acetate is 11.01g;

[0039](2) The lithium acetate reagent is calculated according to the weight loss curve by a thermogravimetric analyzer to obtain its burning vector, and the content of lithium acetate in the lithium acetate reagent is further calculated to be 66.1%. Since lithium acetate needs to react with a coefficient of 1.05 times, and then calculate The quality of lithium acetate reagent required for the reaction is 11.01g×1.05÷66.1%=17.49g; and by the mass fraction of silica sol, the mass of required silica sol is calculated to be 8.35g;

[0040] (3) Dissolve the required lithium acetate reagent and neutral silica sol (containing 30% silicon dioxide) in 120mL deionized water (the...

Embodiment 2

[0045] Repeat Example 1 with the same steps as described, the difference is that in step 3, 9.1765g of lithium formate monohydrate reagent is used to replace the lithium acetate reagent, and the ratio of the stoichiometric number of lithium to silicon dioxide is 4.1:1.

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Abstract

The invention discloses a preparation method for a lithium silicate CO2 adsorbent. The CO2 adsorbent with the component being lithium silicate is obtained by selecting organic lithium salt and a silica sol as precusors of lithium and silicon dioxide, respectively; fully and uniformly mixing the organic lithium salt and the silica sol in a solvent; and calcining the mixture at a high temperature. In the preparation process, by adjusting the stoichiometric number proportioning of lithium and silicon dioxide in the lithium and silicon precusors, the optimization of the reaction is realized. The lithium silicate CO2 adsorbent which is excellent in performance is prepared by virtue of the method disclosed by the invention. The adsorptive property of the adsorbent reaches over 30-50% of the theoretical maximum adsorption. Moreover, in 40 cycles, the adsorbent pores are more developed as the cycle index is increased and the adsorption capacity is further enhanced as the cycle index is increased.

Description

technical field [0001] The invention belongs to the technical field of preparation and improvement of adsorbent, more specifically, relates to a lithium silicate CO 2 Sorbent preparation method. Background technique [0002] As the problem of global warming becomes more and more serious, people gradually realize that it is mainly caused by human activities in the form of CO 2 As a result of massive emissions of greenhouse gases, reducing global CO 2 Emissions are looming, and the impact on CO 2 Research on capture and storage technology (CCS) has become a hot topic. [0003] About CO 2 Capture technologies are currently mainly divided into three categories: pre-combustion capture, post-combustion capture and oxyfuel combustion technologies. Post-combustion capture technology can be realized only by modifying the tail gas part of the existing power plant, which has strong technical and economic advantages. Post-combustion capture mainly includes wet adsorption (such as ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C01B33/32
Inventor 杨新伟刘文强徐明厚孙健胡迎超李明奎
Owner HUAZHONG UNIV OF SCI & TECH
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