Method for recovering gaseous nitrogen from the waste nitrogen stream of an air separation unit
a gaseous nitrogen and waste nitrogen technology, applied in the direction of refrigeration and liquidation, lighting and heating apparatus, solidification, etc., can solve the problems of not being able to make nitrogen gas and/or pure liquid a posteriori, not being able to make very significant changes to devices, and methods known heretofore failing to provide a simple and economical way of producing pure liquid and/or gaseous nitrogen. , to achieve the effect of facilitating distillation
Inactive Publication Date: 2018-01-18
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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Benefits of technology
The invention avoids the need for a separate purification step as there is no significant carbon dioxide or water to be removed. The feed is also more enriched in nitrogen than air, making the distillation easier. The waste nitrogen is typically at lower pressure, so the invention includes a feed compressor to boost the waste nitrogen feedstock up to a suitable pressure for rectification within the distillation column of the nitrogen generator.
Problems solved by technology
On air separation units which are not intended for the production of pure nitrogen, it is of course not possible to make nitrogen gas and / or pure liquid a posteriori without making very significant changes to devices.
Therefore, the methods known heretofore fail to provide a simple and economical way of producing pure liquid and / or gaseous nitrogen from a nitrogen-enriched gas from a main air separation apparatus.
Method used
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[0016]While the invention will be described in connection with several embodiments, it will be understood that it is not intended to limit the invention to those embodiments. On the contrary, it is intended to cover all the alternatives, modifications and equivalence as may be included within the spirit and scope of the invention defined by the appended claims.
[0017]In a typical air separation unit, a stream of dry enriched nitrogen (typically above 90%) is coming out of the cold box and is usually used for: (1) the regeneration of the dryers, (2) the precooling section as a cooling medium in the chiller tower, or (3) simply venting to the atmosphere. If there is a need of extra gaseous nitrogen or liquid nitrogen in a facility close to an already existing air separation unit and there is no extra capacity available on this existing asset, one solution is to use the previously mentioned enriched nitrogen stream (“Waste nitrogen”) as a feed to a cryogenic purification unit to produce...
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The method for the production of nitrogen can include the steps of a) providing a waste nitrogen gas stream at a first pressure called low pressure, wherein the waste nitrogen gas originates from a low pressure column of a cryogenic air separation unit; b)compressing the waste nitrogen gas stream to a second pressure in a waste nitrogen compressor to produce a pressurized nitrogen stream; and c) introducing the pressurized nitrogen stream to a nitrogen generator under conditions effective for producing a purified nitrogen product, wherein the purified nitrogen product has a higher concentration of nitrogen as compared to the pressurized nitrogen stream.
Description
RELATED APPLICATIONS[0001]This application is a non-provisional application of U.S. Provisional Applicant No. 62 / 361,823, filed Jul. 13, 2016, which is herein incorporated by reference in its entirety.TECHNICAL FIELD OF THE INVENTION[0002]The present invention relates to a distillation separation process and plant. In particular, it relates to a process and an apparatus for production of a gaseous nitrogen stream having a high purity with reduced capital investments.BACKGROUND OF THE INVENTION[0003]The usual solution to provide a gaseous nitrogen stream with a high purity is to purify air. The process is based on fractionated air distillation at cryogenic temperature in a single column. It involves five steps: compression, purification, heat exchange, distillation and cold production.[0004]EP-A-0299364 discloses a process in which a nitrogen-rich gas flow from the head of the medium-pressure column of a double column is fed to a column having a head condenser and a flow of high pres...
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Patent Timeline
Login to View More IPC IPC(8): F25J3/04
CPCF25J3/0403F25J3/04393F25J2245/42F25J3/0429F25J3/0406F25J3/044F25J3/08F25J2200/02F25J2210/04F25J2215/42F25J2220/44F25J2230/30F25J2245/02F25J2270/04
Inventor TURNEY, MICHAEL A.BONNE, FREDERICGUERIF, PIERRE-PHILIPPE
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE