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Air separation process using warm and cold expanders

A technology of expander and air, which is applied in the field of low-temperature air separation to effectively prepare oxygen, and can solve problems such as expensive methods

Inactive Publication Date: 2003-07-30
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the method expensive

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  • Air separation process using warm and cold expanders
  • Air separation process using warm and cold expanders
  • Air separation process using warm and cold expanders

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Embodiment Construction

[0017] The present invention proposes a more energy efficient and cost effective low temperature process for producing low purity oxygen. Low purity oxygen is defined as a product fluid having an oxygen concentration below 99.5% and preferably below 97%. In the process, feed air is distilled using a distillation system comprising at least two distillation columns. One distillation column is operated at higher pressure (HP column), while the other column is operated at lower pressure (LP column). Boiling at the bottom of the LP distillation column is provided by condensing a stream having a nitrogen concentration equal to or greater than that of the feed air stream. The present invention employs at least two expanders in the process, wherein the first expander operates at an inlet temperature close to room temperature or greater than room temperature, and the second expander operates at an inlet temperature lower than room temperature. In the present invention, at least one o...

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Abstract

The present invention relates to a process for the cryogenic distillation of air in a distillation column system having at least one distillation column operating at a higher pressure and one distillation column operating at a lower pressure, wherein feed air is cooled and fed to the higher pressure column, wherein the boil-up at the bottom of the lower pressure column producing the oxygen product is provided by condensing a stream having a nitrogen concentration equal to or greater than that of the feed air stream and wherein at least two expanders are employed to provide refrigeration to the distillation column system, wherein the first expander is operated at an inlet temperature near ambient or above ambient temperature and the second expander is operated at an inlet temperature colder than ambient, characterized in that at least one of the two expanders employs following the specific steps to effectively and economically spend energy and fare.

Description

technical field [0001] This invention relates to several processes for the efficient production of oxygen by cryogenic air separation. In particular, the invention relates to cryogenic air separation processes in which it is attractive to produce at least a portion of the total oxygen with a purity of less than 99.5%, and preferably less than 97%. Background technique [0002] There are several US patents teaching the efficient production of oxygen with a purity below 99.5%. Two examples are US Patents 4,704,148 and 4,936,099. [0003] U.S. Patent No. 2,753,698 discloses a process for the fractionation of air in which the total air to be separated is pre-fractionated in the high pressure column of a compound fractionator to produce crude (impure) liquid oxygen (crude LOX) bottoms and Gaseous nitrogen overhead. The crude LOX thus prepared is expanded to moderate pressure and completely evaporated by nitrogen condensation heat exchange. The vaporized crude oxygen is then s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J2240/10F25J3/04393F25J2250/20F25J3/04412F25J2250/42F25J3/04115F25J2215/50F25J3/04024F25J3/04284F25J3/04581F25J3/04303F25J2250/52F25J3/0409F25J2230/04F25J3/04309
Inventor R·阿格拉沃D·M·赫伦
Owner AIR PROD & CHEM INC