Patent · US Expired

Process for air separation by cryogenic distillation

US6295835A · kind A · utility

1Cited by

7References

22Claims

0Family size

Assignee

L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventor

Patrick Le Bot · Saint-Mandé, FR

Key dates

Filing date	Feb 1, 2000
Grant date	Oct 2, 2001
Priority date	—
Expiry date	Feb 1, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S62/909
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

In a process for separating air in a plant comprising at least two columns (1, 3), some of the air (100) at an intermediate pressure is cooled in at least one passage of a heat-exchange system which is or are regenerated by a gas from the plant (17, 21) which may contain at least 50% oxygen. The rest of the air at the medium pressure (200) is either purified outside the heat-exchange system or sent to a passage which is purified in the same way.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.