Process and plant for the simultaneous production of an...

Details Process and plant for the simultaneous production of an... Process and plant for the simultaneous production of an...

2007-07-03

2007-07-03

Tyler, Cheryl (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

C062S611000, C062S617000, C062S618000, C062S630000, C062S613000, C062S619000

Reexamination Certificate

active

10860689

ABSTRACT:
This process includes the following steps:(a) the feed natural gas (101) is introduced into a first distillation column (31) which produces, as top product, a pretreated natural gas (111), which pretreated natural gas (111) no longer contains practically any C6+hydrocarbons;(b) the pretreated natural gas (111) is introduced into an NGL recovery unit (19) comprising at least a second distillation column (49), so as to produce, on the one hand, as column top product, a purified natural gas (151) and, on the other hand, an NGL cut (15); and(c) the said liquefiable natural gas (161) is formed from the purified natural gas (151) resulting from step (b).

REFERENCES:
patent: 3440828 (1969-04-01), Bolez et al.
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patent: 5325673 (1994-07-01), Durr et al.
patent: 6354105 (2002-03-01), Lee et al.
patent: 6539747 (2003-04-01), Minta et al.
patent: 6742358 (2004-06-01), Wilkinson et al.
patent: 2003/0005722 (2003-01-01), Wilkinson et al.
Chiu, C-H: : “LPG-recovery processes for baseload LNG plants examined” Oil and Gas Journal, Pennwell Publishing Co. Tulsa US Nov. 24, 1997, pp. 59-63, XP001093790, ISSN: 0030-1388, the entire document.

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