Nitrogen production system for producing nitrogen with different purities and nitrogen production process thereof
US11150016B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2018 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Mar 23, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2230/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A nitrogen production system that can produce high purity nitrogen containing a desired concentration of oxygen and ultrahigh purity nitrogen containing a desired concentration of argon in a single rectifying column while restraining increase in electric power consumption and a production process thereof are provided. The method can include the steps of rectifying a cooled and compressed air stream in the rectifying column; withdrawing the ultrahigh purity nitrogen stream from a top portion of the nitrogen rectifying column, warming the ultrahigh purity nitrogen stream in a heat exchanger, and then recovering the ultrahigh purity nitrogen stream from the heat exchanger; and withdrawing a high purity nitrogen stream from a rectification section of the nitrogen rectifying column, warming the high purity nitrogen stream in the heat exchanger, and then recovering the high purity nitrogen stream from the heat exchanger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.