Molecular sieve adsorbent for gas purification and preparation thereof
First Claim
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1. A molecular sieve adsorbent for gas purification which comprises a sodium form of low-silica faujasite, having a silica:
- alumina ratio of about 1.8-2.2 with a residual content of potassium ions less than about 8.0 percent (equiv.), and a binder, wherein at least about 80% of said low-silica faujasite, by weight, has a crystal size in the range of 1-4 μ
m and wherein the adsorbent has a volume of macropores with a radius from about 1000 to 10,000 Å
of at least about 0.4 cm3/g.
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Abstract
A molecular sieve adsorbent for the purification of gas streams containing water vapor and carbon dioxide and a process for its preparation. The adsorbent is a sodium form of a low-silica faujasite having a silica to alumina ratio of about 1.8:1 to about 2.2:1, a residual content of potassium ions less than about 8.0 percent (equiv.), a low content of crystalline and amorphous admixtures and crystal sizes generally within the range of 1-4 μm, blended with a binder.
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25 Claims
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1. A molecular sieve adsorbent for gas purification which comprises a sodium form of low-silica faujasite, having a silica:
- alumina ratio of about 1.8-2.2 with a residual content of potassium ions less than about 8.0 percent (equiv.), and a binder, wherein at least about 80% of said low-silica faujasite, by weight, has a crystal size in the range of 1-4 μ
m and wherein the adsorbent has a volume of macropores with a radius from about 1000 to 10,000 Å
of at least about 0.4 cm3/g. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- alumina ratio of about 1.8-2.2 with a residual content of potassium ions less than about 8.0 percent (equiv.), and a binder, wherein at least about 80% of said low-silica faujasite, by weight, has a crystal size in the range of 1-4 μ
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14. A process for the production of a molecular sieve adsorbent comprising
preparing a sodium form of a low-silica faujasite, wherein the low-silica faujasite has a silica: - alumina ratio of about 1.8 to about 2.2 and a residual content of potassium ions less than about 8.0 percent (equiv.);
blending the resultant product with a binder and a peptizer, where in the blended product has a volume of macropores with a radius from about 1000 to 10000 Å
of at least about 0.4 cm3/g;
forming the blended product into a shaped article; and
drying and calcining the article to produce the adsorbent product. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- alumina ratio of about 1.8 to about 2.2 and a residual content of potassium ions less than about 8.0 percent (equiv.);
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16. The process of claim 14 further comprising mixing a powder of montmorillonite in the amount of about 0.6 to about 1.5 percent, based on the final weight of the reaction product, with the prepared low-silica faujasite into a reaction mixture under intensive stirring for out 15 to 30 minutes, wherein the montmorillonite powder has a particle size of 0.4 to 0.8 μ
- m and wherein the low-silica faujasite has a crystal-size in the range of about 1 to 4 μ
m.
- m and wherein the low-silica faujasite has a crystal-size in the range of about 1 to 4 μ
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17. The process of claim 14 further comprising ion exchanging the prepared, sodium form of low-silica faujasite with a sodium chloride solution.
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18. The process of claim 17 wherein the sodium form of low silica faujasite is ion exchanged from about 1 to about 3 times.
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19. The process of claim 17 wherein the sodium form of low silica faujasite is ion exchanged at a temperature from about 60°
- C. to about 85°
C.
- C. to about 85°
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20. The process of claim 14 further comprising ion exchanging the prepared, sodium form of low-silica faujasite with a solution comprising sodium chloride and sodium hydroxide.
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21. The process of claim 14 further comprising treating the prepared sodium form of low-silica faujasite and binder with a pore-forming additive.
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22. The process of claim 21 wherein the pore-forming additive is selected from the group consisting of synthetic and natural materials including mineral acids, polyalkeneglycols, polyacrylamides, polycarboxylates, starch, molasses and lignin.
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23. The process of claim 21 wherein the peptizer and pore-forming additives comprise from about 0.5 to about 2.0 percent of the adsorbent product, based on a total weight of the adsorbent product.
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24. The process of claim 14 further comprising blending the low-silica faujasite with the peptizer.
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25. The process of claim 14 further comprising blending the binder with the peptizer.
Specification