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Method of separating and/or purifying a gas mixture

A technology for gas mixtures and mixed oxides, used in separation methods, chemical instruments and methods, gas treatment, etc.

Inactive Publication Date: 2009-01-28
BUREAU DE RECH GEOLOGIQUES & MINIERES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drawback of this technique is that it can only be effectively treated at low airflow rates

Method used

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  • Method of separating and/or purifying a gas mixture
  • Method of separating and/or purifying a gas mixture
  • Method of separating and/or purifying a gas mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] For this purpose, an amorphous oxide mixture suspended in water is used as the adsorbent product, which passes through the Mg 2+ / Al 3+ Type layered double hydroxide is formed by heat treatment.

[0033] A mixed gas M of nitrogen and carbon dioxide is introduced into the aqueous phase. Figure 2a The carbon dioxide concentration in the gas stream at the outlet of the reactor is shown as a function of time. It can be seen that during the first five hours (i.e., the adsorbent product captures carbonate ion CO 3 2- period), the concentration of carbon dioxide decreases below 10% of the initial concentration, and increases again after the adsorbent product is saturated with anions. In the initial stage (capture), such as Figure 2b As shown, with the carbonate ion CO in the liquid phase 3 2- The decrease of the alkalinity of the solution increases, so that the pH value increases correspondingly.

[0034] In addition, the sorbent was analyzed, which confirmed that carb...

Embodiment 2

[0037] In the same way, a mixture of carbonate, sulfate and nitrate anions in aqueous solution was treated with an adsorbent product comprising amorphous mixed 2+ / Al 3+ Type layered double hydroxide is made by heat treatment, the aqueous solution is expressed as containing CO 2 , SO x and NO x The gas diffuses into an aqueous solution to form a solution.

[0038] Furthermore, it can be seen that sulfate anions were moderately adsorbed into the sorbent product while nitrate anions were not adsorbed during the tests performed in the laboratory. In contrast, carbonate anions, which have a strong affinity for this type of layered double hydroxide, are abundantly adsorbed. The following table shows the relationship with CO 3 2- , SO 4 2- and NO 3 - The respective contents of carbon, nitrogen and sulfur in the layered double hydroxide contacted by the anion mixture, their initial concentrations are 0.1M, 0.1M and 0.2M, respectively.

[0039] surface

[0040] an...

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Abstract

The invention relates to a method of separating / purifying a gas mixture (M), including a step consisting in capturing at least one gas which can generate anionic species by means of dissolution in aqueous phase. The invention is characterised in that it also includes the following steps consisting in: suspending an absorbent product in the aforementioned aqueous phase, said absorbent product consisting of a lamellar double hydroxide or a mixed oxide which is believed to be amorphous and which originates from the moderate heat treatment of lamellar double hydroxides having an affinity for the above-mentioned gas; distributing the gas mixture (M) in the aqueous phase; and recovering the adsorbate from the absorbent product in suspension.

Description

technical field [0001] The present invention relates to a method for the separation and / or purification of gas mixtures, some of which are capable of forming anions in the aqueous phase. Background technique [0002] Various methods are known, whether physical or chemical, for the separation and / or purification of gas mixtures, especially those which may contain carbon dioxide. The most common techniques employed for the purification of carbon dioxide are based on amines, especially Is based on the application of monoethanolamine solvent. While this method is effective, it suffers from transport deficiencies due to its solvent properties. On the other hand, many such as NO x and SO x The adverse effect of impurities such as amines on the amines reduces the efficiency of the process. [0003] Methods using mineral traps have also been proposed, which exploit the capacity of the trap to increase porosity and thereby improve capillary condensation of gases. These traps are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02
CPCB01D2257/404Y02C10/08B01D2257/504B01D2257/302B01D53/025Y02C20/40
Inventor 阿兰·塞龙法比安·德洛姆
Owner BUREAU DE RECH GEOLOGIQUES & MINIERES