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Nitrogen gas production method

A nitrogen and nitrogen-enriched technology, applied in the field of producing nitrogen-enriched steam products, producing at least one nitrogen-enriched steam product, can solve the problem that countercurrent heat exchangers are expensive

Inactive Publication Date: 2006-12-06
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adsorption units with or without heat exchangers, or counter-flow heat exchangers are expensive

Method used

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  • Nitrogen gas production method
  • Nitrogen gas production method
  • Nitrogen gas production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Table 1 includes corresponding to the present invention figure 1 Numerical example of the embodiment shown.

[0050] logistics number

[0051] This example shows that under the conditions described above, the process of the present invention saves about 29% of the nitrogen-rich liquid that would otherwise have to be evaporated to produce the desired product.

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Abstract

A nitrogen-enriched vapour product (120) is produced from a supply (116) of a nitrogen-rich liquid using a purifying device (106) and a distillation column (140) having a distillation zone. At least a portion of the nitrogen-rich liquid is fed to the distillation zone at a first location; a stream of a gas containing nitrogen and at least one contaminant (140) is fed to the purifying device (106), wherein the gas is cooled by a cryogenic liquid (130) whereby at least a portion of the at least one contaminant condenses, solidifies, or dissolves; at least a portion of, or derived from, the cool gas from the purifying device (106) is fed to the distillation zone at a second location below the first location; a stream of the nitrogen-enriched vapour product (120) is withdrawn from the distillation zone; and a stream of a nitrogen-depleted liquid (130) is withdrawn from the distillation zone. The nitrogen-depleted liquid (130) can provide the cryogenic liquid for the purifying device (106).

Description

[0001] Cross-references to related applications [0002] This application is a continuation-in-part of USSN 10 / 136,999 filed May 1,2002. Background of the invention [0003] This invention relates generally to processes for the cryogenic distillation of air, and in particular to said processes for producing at least one nitrogen-enriched vapor product. [0004] Nitrogen is one of the most important industrial gases. A common means of supplying nitrogen to a process or user is the user station. Typically, liquid nitrogen is transported to the user site in a cryogenic air separation plant tanker or liquefier, where it is stored in a container, optionally pumped to the desired pressure, and evaporated in an ambient evaporator. This approach is thermodynamically very inefficient. However, such equipment is cheap and reliable. [0005] Another common method for producing nitrogen at the user's site is a cryogenic air separation plant. Purifies air to r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02B01D53/22F25J3/04F25J3/08
CPCF25J2215/42F25J2250/52F25J3/0406F25J2205/20F25J2235/42F25J2205/02F25J2200/70F25J2200/02F25J3/04254Y10S62/908F25J2205/30F25J3/04163F25J2240/90F25J3/04636F25J2250/42F25J2205/80F25J2210/42Y10S62/913F25J2205/84F25J2235/52F25J3/08F25J3/04242F25J2240/22F25J2220/40F25J3/044
Inventor J·L·格里菲思A·A·布罗斯托D·P·奥康诺S·森德P·A·霍顿
Owner AIR PROD & CHEM INC