Purification method and purification system for propane
First Claim
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1. A purification method for low-purity propane, comprising:
- performing the following adsorption steps on the low-purity propane in any order, the low-purity propane including (i) water, (ii) carbon dioxide, (iii) ethane and/or propylene, and (iv) isobutane and/or normal butane;
adsorbing said water and carbon dioxide present in the low-purity propane in a gaseous phase by means of a zeolite molecular sieve that preferentially adsorbs water and carbon dioxide over propane;
adsorbing said ethane and/or propylene present in the low-purity propane in a gaseous phase by means of an activated carbon molecular sieve that preferentially adsorbs ethane and propylene over propane;
adsorbing said isobutane and/or normal butane present in the low-purity propane in a gaseous phase by means of activated carbon that preferentially adsorbs isobutane and normal butane over propane;
then, partially condensing propane in a state in which nitrogen and oxygen are maintained in a gaseous phase by introducing the low-purity propane in a gaseous phase into a partial condenser;
extracting nitrogen and oxygen in a gaseous phase from said partial condenser separately from the condensed propane; and
collecting high purity propane from said partial condenser into a collection container.
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Abstract
[PROBLEM] To provide an industrially advantageous method and system that are simple and have superior energy efficiency for obtaining high-purity propane from low-purity propane.
[SOLUTION] Water, carbon dioxide, at least one of ethane and propylene, and at least one of isobutane and normal butane present in low-purity propane in a gaseous phase are adsorbed by means of a zeolite molecular sieve that preferentially adsorbs water and carbon dioxide over propane, an activated carbon molecular sieve that preferentially adsorbs ethane and propylene over propane, and activated carbon that preferentially adsorbs isobutane and normal butane over propane. Propane is condensed in a state in which nitrogen and oxygen are maintained in a gaseous state by introducing the low-purity propane in a gaseous phase into a partial condenser. Nitrogen and oxygen in the gaseous phase are extracted from the partial condenser.
4 Citations
10 Claims
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1. A purification method for low-purity propane, comprising:
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performing the following adsorption steps on the low-purity propane in any order, the low-purity propane including (i) water, (ii) carbon dioxide, (iii) ethane and/or propylene, and (iv) isobutane and/or normal butane; adsorbing said water and carbon dioxide present in the low-purity propane in a gaseous phase by means of a zeolite molecular sieve that preferentially adsorbs water and carbon dioxide over propane; adsorbing said ethane and/or propylene present in the low-purity propane in a gaseous phase by means of an activated carbon molecular sieve that preferentially adsorbs ethane and propylene over propane; adsorbing said isobutane and/or normal butane present in the low-purity propane in a gaseous phase by means of activated carbon that preferentially adsorbs isobutane and normal butane over propane; then, partially condensing propane in a state in which nitrogen and oxygen are maintained in a gaseous phase by introducing the low-purity propane in a gaseous phase into a partial condenser; extracting nitrogen and oxygen in a gaseous phase from said partial condenser separately from the condensed propane; and collecting high purity propane from said partial condenser into a collection container. - View Dependent Claims (2)
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3. A purification system for low-purity propane comprising:
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a low-purity propane supply source connected to a start of a propane flow path configured to supply a stream comprising the low-purity propane including (i) water, (ii) carbon dioxide, (iii) ethane and/or propylene, and (iv) isobutane and/or normal butane; a first adsorption unit filled with a zeolite molecular sieve configured to preferentially adsorbs water and carbon dioxide over propane; a second adsorption unit filled with an activated carbon molecular sieve configured to preferentially adsorbs ethane and propylene over propane; a third adsorption unit filled with activated carbon configured to preferentially adsorbs isobutane and normal butane over propane; a partial condenser comprising a cooling means configured to condense propane in a state in which nitrogen and oxygen are maintained in a gaseous phase; said first adsorption unit, said second adsorption unit, said third adsorption unit, and said partial condenser are connected in series so as to form the propane flow path; a pressure regulating means configured to regulate pressure in said propane flow path so that the low-purity propane in a gaseous phase is introduced into said first adsorption unit, said second adsorption unit, said third adsorption unit, and said partial condenser, an exhaust path configured to extract nitrogen and oxygen in a gaseous phase from said partial condenser, and a collection container connected to the end of said propane flow path configured to collect purified propane. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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Specification
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Current AssigneeSumitomo Seika Chemicals Company Limited
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Original AssigneeSumitomo Seika Chemicals Company Limited
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InventorsKawakami, Junichi, Tai, Shinichi, Tanaka, Saori
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Primary Examiner(s)Pregler, Sharon
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Application NumberUS14/362,880Publication NumberTime in Patent Office1,581 DaysField of Search585/800.SUS Class Current1/1CPC Class CodesC07C 7/09 by fractional condensationC07C 7/12 by adsorption, i.e. purific...C07C 7/13 by molecular-sieve techniqueC07C 9/08 Propane
