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Two Step Nitrogen and Methane Separation Process

a nitrogen and methane separation and two-step technology, applied in the direction of lighting and heating equipment, liquid solidification, refrigeration and liquidation, etc., can solve the problems of higher capital costs associated with additional equipment and the difficulty of separation of ngl components, and achieve the effect of facilitating the economically efficient removal of nitrogen

Inactive Publication Date: 2014-03-13
BUTTS PROPERTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system efficiently processes nitrogen and methane streams, reducing overall compression requirements by up to 40% and enabling effective NGL extraction, while maintaining high nitrogen purity and reducing capital costs through optimized processing stages and temperatures.

Problems solved by technology

In traditional nitrogen separation systems, the separation of NGL components is more difficult in streams containing more than 5% nitrogen because nitrogen has a stripping effect, absorbing ethane and heavier components.
Although the present system and method has the disadvantage of higher capital costs associated with additional equipment, compared to prior single column NRU processes, the costs of such are sufficiently offset by the savings in operating expenses, such as those from the reduced compression requirements, and the ability to efficiently produce a suitable processed natural gas stream and valuable NGL stream.

Method used

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  • Two Step Nitrogen and Methane Separation Process
  • Two Step Nitrogen and Methane Separation Process
  • Two Step Nitrogen and Methane Separation Process

Examples

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Embodiment Construction

[0022]Referring to FIG. 1, system 10 comprises processing equipment useful for separating nitrogen from methane according to one embodiment of the invention is depicted. System 10 of the invention includes processing stages 12, 14, and 18 for processing NRU feed gas 11 to produce a nitrogen vent stream 16 and a processed gas stream 20. Processing stage 12 includes a first stage fractionating column, the overhead stream from which serves as the feed for processing stage 14, which includes a second stage fractionating column. The overhead stream from processing stage 14 is a nitrogen vent stream 16. The bottoms streams from processing stages 12 and 14 feed a series of compressors in processing stage 18 to produce processed gas 20 of sufficient pressure and methane composition to be suitable for sale.

[0023]Referring to FIG. 2, system 210 comprises processing equipment useful for separating nitrogen and methane, as well as extracting NGL, according to another embodiment of the invention...

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Abstract

A system and method for removing nitrogen and producing a high pressure methane product stream from natural gas feed streams is disclosed. A system for also producing natural gas liquids in conjunction with nitrogen removal from natural gas feed streams is also disclosed. The system and method of the invention are particularly suitable for use with feed streams in excess of 50 MMSCFD and up to 750 MMSCFD and containing up to 75 ppm carbon dioxide. Typical power requirements for compressing the methane product stream to produce a suitably high pressure stream for sale are reduced according to the system and method of the invention.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001]This application is a divisional of U.S. application Ser. No. 13 / 16,843, filed on Jun. 21, 2011.BACKGROUND OF THE INVENTION [0002]1. Field of the Invention[0003]This invention relates to a system and method for separating nitrogen from methane and other components from natural gas streams. The invention also relates to a system and method for integrating natural gas liquids (NGL) extraction with nitrogen removal. The system and method of the invention are particularly suitable for use in recovering and processing feed streams typically in excess of 50 MMSCFD.[0004]2. Description of Related Art[0005]Nitrogen contamination is a frequently encountered problem in the production of natural gas from underground reservoirs. The nitrogen may be naturally occurring or may have been injected into the reservoir as part of an enhanced recovery operation. Transporting pipelines typically do not accept natural gas containing more than 4 mole percent i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/02
CPCF25J3/0214F25J3/0257F25J3/0209F25J3/0233F25J3/0238F25J2200/04F25J2200/08F25J2200/70F25J2200/74F25J2230/32F25J2235/60F25J2270/02
Inventor BUTTS, RAYBURN C.
Owner BUTTS PROPERTIES
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