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Dual Purity Oxygen from an Air Separation Unit

IP.com Disclosure Number: IPCOM000019402D
Publication Date: 2003-Sep-12
Document File: 2 page(s) / 69K

Publishing Venue

The IP.com Prior Art Database

Abstract

In a dual column thermally integrated cryogenic air separation unit (ASU), purified oxygen is obtained from the sump of low pressure column with single or multiple reboilers. For the fixed boil-up in the lower pressure column, a larger quantity of low purity oxygen (lower than 98%) product can be obtained compared to the high purity product (98% and higher). Thus, the oxygen recovery for low purity product is greater than that for the high purity product. The given boil-up can also be utilized to co-produce high purity oxygen product from the sump of lower pressure column with a single reboiler. It was observed that without any significant penalty to the recovery, a fraction of high purity oxygen product can be produced from the sump of lower pressure column with a single reboiler and the low purity oxygen product can be obtained from the section above the sump. Up to 40% of the product can be obtained as high purity oxygen stream without any significant penalty to the recovery, and beyond 40% the high purity product can be obtained with a small penalty of reduced oxygen recovery.

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Dual Purity Oxygen from an Air Separation Unit

In a dual column thermally integrated cryogenic air separation unit (ASU), purified oxygen is obtained from the sump of low pressure column with single or multiple reboilers. For the fixed boil-up in the lower pressure column, a larger quantity of low purity oxygen (lower than 98%) product can be obtained compared to the high purity product (98% and higher). Thus, the oxygen recovery for low purity product is greater than that for the high purity product. The given boil-up can also be utilized to co-produce high purity oxygen product from the sump of lower pressure column with a single reboiler. It was observed that without any significant penalty to the recovery, a fraction of high purity oxygen product can be produced from the sump of lower pressure column with a single reboiler and the low purity oxygen product can be obtained from the section above the sump. Up to 40% of the product can be obtained as high purity oxygen stream without any significant penalty to the recovery, and beyond 40% the high purity product can be obtained with a small penalty of reduced oxygen recovery.

Dual purity or multi-purity oxygen streams can be produced in ASU by simultaneously withdrawing a stream, or streams, of significantly pure oxygen product as liquid or gas from sections above the sump of the lower pressure column of the dual column or multiple column distillation plant. The high purity oxygen can be withdrawn from the sump of the lower...