Method and apparatus for producing nitrogen from air by cryogenic distillation

a technology of cryogenic distillation and air, which is applied in the direction of lighting and heating apparatus, refrigeration and liquid storage, solidification, etc., can solve the problem that simple two-column systems do not necessarily have lower unit energy requirements, and achieve the effect of low energy requirements and efficient raising

Inactive Publication Date: 2001-10-18
MOSTELLO ROBERT ANTHONY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

0025] In other respects the process embodiment in FIG. 2 is similar to that of FIG. 1. Still another embodiment of the invention (not shown) achieves elevation of the low pressure column pressure and the high pressure column pressure by means of elevation of the vaporization pressure of the low pressure column condenser coolant. In these cases

Problems solved by technology

Nevertheless, simple two-column systems do not necessarily have l

Method used

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  • Method and apparatus for producing nitrogen from air by cryogenic distillation
  • Method and apparatus for producing nitrogen from air by cryogenic distillation

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Embodiment Construction

[0026] A process for the recovery of substantially pure nitrogen at a rate of 2687 Nm3 / hr at a pressure of 4.9 atma is conducted in accordance with FIG. 1. Nm3 / hr refers to the flow rate of a substance measured as a gas at 0 C. and 1 atma. C. refers to temperature in degrees Celsius; atma refers to pressure in absolute atmospheres. K refers to temperature in degrees Kelvin.

[0027] A feed air flow of 4632 Nm3 / hr was compressed to a pressure of 5.2 atma, aftercooled to about ambient temperature, its water condensate removed, and passed to an adsorption unit for removal of water and carbon dioxide, and possibly other contaminants. The purified air 101 was passed to main heat exchanger 11 where it was cooled to approximately its dew point, producing a small amount of liquid. Air 105 entered the bottom of high pressure column 13 at 98.6 K and 5.05 atma. The high pressure column is internally made up of structured packing for mass transfer.

[0028] Gaseous nitrogen at a 94.1 K and 5.0 atma e...

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Abstract

Nitrogen gas at a single pressure is produced from a two-column cryogenic distillation of air. The bottoms liquid product from the high pressure column is divided into portions, at least one of which does not enter the low pressure column as a feed stream. By these means, a portion of an oxygen-rich stream is removed from the distillation, further enhancing nitrogen recovery and achieving low specific energy consumption for nitrogen product.

Description

[0001] This application is entitled to the benefit of Provisional Patent Application Ser. No. 60 / 186,572 filed Mar. 2, 2000.[0002] This is a Continuation-in-part of Ser. No. 09 / 775,362, Feb. 1, 2001, now abandoned.[0003] The present invention is directed to the cryogenic separation of air by distillation for the production of primarily gaseous nitrogen.[0004] Nitrogen is among the most heavily produced and used chemicals. It finds application in the petroleum, glass, foods, electronics, pharmaceutical, and metals industries. Cryogenic separation of air is a principal means of producing nitrogen. Cryogenic air separation plants, chiefly for the production of gaseous nitrogen, exist in a number of configurations. These, in turn, group around single distillation column and double distillation column designs. There are many variations of these designs in each category. In most cases the objective is to produce nitrogen at the lowest energy consumption for any given delivery pressure; bu...

Claims

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Application Information

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IPC IPC(8): F25J3/04
CPCF25J3/04254F25J3/04284F25J3/04424F25J3/04884F25J2205/02F25J2210/42F25J2235/42F25J2245/42F25J2250/20F25J2250/40F25J2250/52F25J3/0423F25J2200/20F25J2250/02F25J2250/10
Inventor MOSTELLO, ROBERT ANTHONY
Owner MOSTELLO ROBERT ANTHONY
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