PURIFICATION METHOD AND PURIFICATION SYSTEM FOR PROPANE
First Claim
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1. A purification method for low-purity propane containing at least one of ethane and propylene, at least one of isobutane and normal butane, water, nitrogen, oxygen, and carbon dioxide as impurities,the purification method for propane is characterized by comprising:
- an adsorption step of adsorbing 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;
an adsorption step of adsorbing at least one of ethane and 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;
an adsorption step of adsorbing at least one of isobutane and 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;
a partial condensation step of 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; and
an exhaust step of extracting nitrogen and oxygen in a gaseous phase from said partial condenser separately from the condensed propane, whereinthe impurities are separated from the low-purity propane by said respective adsorption steps, said partial condensation step, and said exhaust step.
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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.
5 Citations
10 Claims
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1. A purification method for low-purity propane containing at least one of ethane and propylene, at least one of isobutane and normal butane, water, nitrogen, oxygen, and carbon dioxide as impurities,
the purification method for propane is characterized by comprising: -
an adsorption step of adsorbing 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; an adsorption step of adsorbing at least one of ethane and 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; an adsorption step of adsorbing at least one of isobutane and 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; a partial condensation step of 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; and an exhaust step of extracting nitrogen and oxygen in a gaseous phase from said partial condenser separately from the condensed propane, wherein the impurities are separated from the low-purity propane by said respective adsorption steps, said partial condensation step, and said exhaust step. - View Dependent Claims (2)
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3. A purification system for low-purity propane containing at least one of ethane and propylene, at least one of isobutane and normal butane, water, nitrogen, oxygen, and carbon dioxide as impurities,
the purification system for propane is characterized by comprising: -
a first adsorption unit filled with a zeolite molecular sieve that preferentially adsorbs water and carbon dioxide over propane; a second adsorption unit filled with an activated carbon molecular sieve that preferentially adsorbs ethane and propylene over propane; a third adsorption unit filled with activated carbon that preferentially adsorbs isobutane and normal butane over propane; and a partial condenser, wherein said first adsorption unit, said second adsorption unit, said third adsorption unit, and said partial condenser are connected in series so as to form a propane flow path, a low-purity propane supply source is connected to one end of said propane flow path, a collection container for purified propane is connected to the other end of said propane flow path, a pressure regulating means that regulates pressure in said propane flow path is provided 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, said partial condenser has a cooling means for the low-purity propane so that propane is condensed in said partial condenser in a state in which nitrogen and oxygen are maintained in a gaseous phase, and an exhaust path is provided for extracting nitrogen and oxygen in a gaseous phase from said partial condenser. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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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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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current585/802
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CPC Class CodesC07C 7/09 by fractional condensationC07C 7/12 by adsorption, i.e. purific...C07C 7/13 by molecular-sieve techniqueC07C 9/08 Propane
