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An adsorbent for selective adsorption of unsaturated hydrocarbons from its mixture with saturated hydrocarbons, carbon dioxide, carbon monoxide, permanent gases or mixture thereof. The adsorbent includes a silver or copper compound in an amount of 1 to 70 wt % and a substrate in 30 to 99% wt %. Also

An adsorbent for selective adsorption of unsaturated hydrocarbons from its mixture with saturated hydrocarbons, carbon dioxide, carbon monoxide, permanent gases or mixture thereof. The adsorbent includes a silver or copper compound in an amount of 1 to 70 wt % and a substrate in 30 to 99% wt %. Also a method for the manufacture of an adsorbent, which includes impregnating or dispersing a silver (I) or copper (I) compound on a mesoporous substrate or support to form a composite material and subjecting the composite material to heat treatment. Also, a process for separating ethylene and/or propylene from gas mixtures containing them by passing a stream of the gas mixture through a mass of the adsorbent at a temperature from 0° C. to 170° C. and a pressure from 0.1 to 100 atmospheres and releasing the adsorbed ethylene and/or propylene by lowering pressure and/or increasing temperature.

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1. A process for separating ethylene, propylene or a mixture thereof from a mixed gas comprising the steps of:(a) providing an adsorbent comprising a silver or copper compound impregnated on a substrate consisting of mesopores selected from the group consisting of mesoporous silica and mesoporous al

1. A process for separating ethylene, propylene or a mixture thereof from a mixed gas comprising the steps of:(a) providing an adsorbent comprising a silver or copper compound impregnated on a substrate consisting of mesopores selected from the group consisting of mesoporous silica and mesoporous alumina, the silver or copper compound being present in the adsorbent in an amount of 1 to 70 wt % and the substrate being in the adsorbent in an amount of 30 to 99 wt %;(b) passing a mixed gas containing olefin molecules, including the ethylene propylene or mixture thereof, and a component selected from the group consisting of H, N 2 , Ar, He, CH 4 , C 2 H 6 , C 3 H 8 , CO, CO 2 and a mixture thereof;purging the adsorbent bed with an olefin; and(c) recovering adsorbed ethylene and/propylene. 2. A process as claimed in claim 1, wherein the recovering in step (c) comprises lowering a pressure on and/or heating the adsorbent. 3. A process as claimed in claim 1, wherein the adsorbent comprises a silver (I) compound selected from the group consisting of silver nitrate, silver perchlorate, silver tetrafluoroborate, silver carboxylate, silver halide, silver sulfate, silver oxide and a mixture thereof. 4. A process as claimed in claim 1, wherein the adsorbent comprises a copper compound selected from the group consisting of copper (I) chloride, copper sulfate and copper acetate. 5. A process as claimed in claim 1, wherein the adsorbent comprises mesoporous alumina having an average pore diameter of 5 to 12 nm and a minimum surface area of 200 m 2 /g. 6. A process as claimed in claim 1, wherein the substrate is in powder form. 7. A process as claimed in claim 1, wherein the substrate is in a form of formed bodies. 8. A process as claimed in claim 7, wherein the formed bodies have a size in a range of 0.01 to 5 nm. 9. A process as claimed in claim 7, wherein the substrate has been pelletized with inorganic clay. 10. A process as claimed in claim 9, wherein the inorganic clay is selected from the group consisting of alumina, bentonite, attapulgite, sapiolite, kaolinite, sodium silicate and potassium silicate. 11. A process as claimed in claim 1, wherein the adsorbent consists essentially of the silver or copper compound and the substrate. 12. A process as claimed in claim 1, wherein the adsorbent consists of the silver or copper compound and the substrate. 13. A process for separating ethylene, porpylene or a mixture thereof from a mixed gas comprising the steps of:(a) providing an adsorbent comprising a silver or copper compound impregnated on a substrate comprising mesoporous silica or mesoporous alumina, the silver or copper compound being present in the adsorbent in an amount of 1 to 70 wt % and the substrate being in the adsorbent in an amount of 30 to 99 wt %;(b) passing a mixed gas containing olefin molecules, including the ethylene propylene or mixture thereof, and a component selected from the group consisting of H, N, Ar, He, CH 4 , C 2 H 6 , C 3 H 8 , CO, CO 2 and a mixture thereof;purging the adsorbent bed with an olefin; and(c) recovering adsorbed ethylene and/propylene wherein the adsorbent comprises mesoporous silica selected from the group consisting of hexagonal mesoporous silica and SBA-15, the mesoporous having an average pore diameter of 2 nm to 10 nm and minimum surface area of 200 m 2 /g. 14. An adsorbent for selective adsorption of unsaturated hydrocarbons comprising a silver or copper compound in an amount of 1 to 70 wt % and a substrate consisting of mesopores selected from the group consisting of mesoporous silica and mesoporous alumina in an amount of 30 to 99 wt %. 15. An adsorbent as claimed in claim 14, wherein the silver compound is a silver (I) compound selected from the group consisting of silver nitrate, silver perchlorate, silver tetrafluoroborate, silver carboxylate, silver halide, silver sulfate, silver oxide and a mixture thereof. 16. An adsorbent as claimed in claim 14, wherein the copper c ompound is selected from the group consisting of copper (I) chloride, copper sulfate and copper acetate. 17. An adsorbent as claimed in claim 14, wherein the substrate is mesoporous alumina having an average pore diameter of 5 to 12 nm and a minimum surface area of 200 m 2 /g. 18. An adsorbent as claimed in claim 14, wherein the mesoporous substrate is in powder form. 19. An adsorbent as claimed in claim 14, wherein the mesoporous substrate is in a form of formed bodies. 20. An adsorbent as claimed in claim 19, wherein the formed bodies have sizes within a range of 0.01 to 5 nm. 21. An adsorbent as claimed in claim 19, wherein the substrate has been pelletized with inorganic clay. 22. An adsorbent as claimed in claim 21, wherein the inorganic clay is selected from the group consisting of alumina, bentonite, attapulgite, sapiolite, kaolinite, sodium silicate and potassium silicate. 23. An adsorbent as claimed in claim 14, wherein the adsorbent consists essentially of the silver or copper compound and the substrate. 24. An adsorbent as claimed in claim 14, wherein the adsorbent consists of the silver or copper compound and the substrate. 25. An adsorbent for selective adsorption of unsaturated hydrocarbons comprising a silver or copper compound in an amount of 1 to 70 wt % and a substrate selected from the group consisting of mesoporous silica and mesoporous alumina in an amount of 30 to 99 wt %, wherein the substrate is mesoporous silica selected from the group consisting of hexagonal mesoporous silica and SBA-15, said mesoporous silica having an average pore diameter of 2 nm to 10 nm and a minimum surface area of 200 m 2 /g. 26. A method for the manufacture of an adsorbent comprising impregnating or dispersing a silver (I) compound or a copper (I) compound on a substrate consisting of mesopores selected from the group consisting of mesoporous silica and mesoporous alumina to form a composite material and drying the composite material by heat treatment. 27. A method as claimed in claim 26, wherein the substrate is impregnated or dispersed with a silver (I) compound selected from the group consisting of silver nitrate, silver perchlorate, silver tetrafluoroborate, silver carboxylate, silver halide, silver sulfate, silver oxide and a mixture thereof. 28. A method as claimed in claim 26, wherein the substrate is impregnated or dispersed with a copper (I) compound selected from the group consisting of copper (I) chloride, copper sulfate and copper acetate. 29. A method as claimed in claim 26, wherein the silver (I) compound is in the form of a solution comprising a solvent selected from the group consisting of water, aqueous hydrochloric acid solution, aqueous nitric acid solution, ammonium hydroxide solution, primary or secondary alcohols having 1 to 7 carbon atoms, acetone, ethyl acetate, C4 to C7 hydrocarbons, propionitrile and acetonitrile. 30. A method as claimed in claim 26, wherein the silver (I) compound or the copper (I) compound is impregnated on the substrate by physically mixing the silver (I) compound or the copper (I) compound in a sold form with the support in powder form. 31. A method as claimed in claim 26, wherein the adsorbent comprises the silver (I) compound or the copper (I) compound in an amount from 1 to 70 wt %. 32. A method as claimed in claim 26, wherein the composite material is dried at a temperature in the range of 90 to 110° C. 33. A method as claimed in claim 26, wherein the dried composite material is calcined at a temperature in the range of 30 to 600° C. 34. A method as claimed in claim 33, wherein the dried composite material is calcined at a temperature in the range of 100-250° C. 35. A method as claimed in claim 34, wherein the calcination is carried out for a period in the range of 0.1 to 100 hours. 36. A method as claimed in claim 35, wherein the calcination is carried out for a period in the range of 1 to 10 hours. 37. A method as claimed in claim 26, wherein the mesoporous substrate is mesoporous alumina having an average pore diameter of 5 to 12 nm and a minimum surface area of 200 m 2 /g. 38. A method as claimed in claim 26, wherein the mesoporous substrate is in powder form. 39. A method as claimed in claim 26, wherein the mesoporous substrate is in a form of formed bodies. 40. A method as claimed in claim 39, wherein the formed bodies have a size in a range of 0.01 to 5 nm. 41. A method as claimed in claim 39, wherein the substrate has been pelletized with inorganic clay. 42. A method as claimed in claim 41, wherein the inorganic clay is selected from the group consisting of alumina, bentonite, attapulgite, sapiolite, kaolinite, sodium silicate and potassium silicate. 43. A method for the manufacture of an absorbent comprising impregnating or dispersing a silver (I) compound or a copper (I) compound on a mesoporous substrate selected from the group consisting of mesoporous silica and mesoporous alumina to form a composite material and drying the composite material by heat treatment, where the mesoporous silica is selected from the group consisting of hexagonal mesoporous silica and SBA-15, the mesoporous silica having an average pore diameter of 2 nm to 10 nm and a minimum surface area of 200 m 2 /g.