Hydrocarbon gas processing

a technology of hydrocarbon gas and processing method, which is applied in the direction of cold treatment separation, liquefaction, solidification, etc., can solve the problems of not only the capital cost of the plant, but also the operating expense of the plant, and the substantial incremental cost of operating in this manner

Inactive Publication Date: 2003-02-13
TREBBLE MARK A
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Benefits of technology

0007] In a typical cryogenic expansion recovery process, the bottom stream from the demethanizer is typically sent for fractionation in a deethanizer where the ethane (C2), carbon dioxide and lighter components are separated from the propane and heavier (C3+) components. The overhead of the deethanizer is typically configured with a condenser which takes all of the C2, carbon dioxide and lighter components as a vapor from the deethanizer and completely condenses it to make a liquid product comprising primarily of C2 and smaller amounts of carbon dioxide and lighter components. The current invention does not condense all the vapour leaving the deethanizer overhead but a

Problems solved by technology

There are many options for removing the carbon dioxide (treating the incoming feed gas, treating the total liquid product, treating the ethane product after fractionation, etc.), but all of these options will add not only to the capital cost of the plant due to the cost of installing the treating system, but also to the operating expense of the plant due to energy and/or chemical consumption in the treating system.
This preheating requires an addition of 17,900,000 Btu/hr in exchanger E413 which represents a substantial incremental cost of oper

Method used

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Embodiment Construction

. 3 and 4 illustrate flow diagrams of a process in accordance with the present invention. The feed gas composition and conditions considered in the inventive process are the same as those in prior art FIGS. 1 and 2 and comprises a similar cryogenic expansion recovery process. Accordingly, the FIGS. 3 / 4 process can be compared with that of the FIGS. 1 and 2 processes to illustrate the operation of the present invention. The FIGS. 3 / 4 process described below is exemplary of the present invention and is not intended to limit the invention claimed herein. In particular, one skilled in the art will realize that many variations on the demethanizer deethanizer configuration and the various energy exchanges illustrated exist which are compatible with and included within the scope of the claimed invention. In the simulation of the FIG. 3 process, inlet gas (stream 1) enters at 50.degree. F. and a pressure of 650 psia. The feed stream 1 is split into streams 2 and 3. Stream 2 is subsequently ...

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Abstract

A cryogenic natural gas liquids recovery process which includes the use of a demethanizer and a deethanizer includes a step of recycling a portion of the deethanizer overhead to the demethanizer.

Description

BACKGROUND OF INVENTION[0001] The present invention relates to methods of processing hydrocarbon gases. In particular, it relates to methods of limiting the carbon dioxide content of liquids produced from natural gas liquids recovery processes.[0002] Ethylene, ethane, propylene, propane and / or heavier hydrocarbons can be recovered from a variety of gases, such as natural gas, refinery gas, and synthetic gas streams obtained from other hydrocarbon materials such as coal, crude oil, naphtha, oil shale, tar sands, and lignite.[0003] Natural gas usually has a major proportion of methane and ethane, usually in excess of 50 mole percent of the gas. The gas also contains relatively lesser amounts of heavier hydrocarbons such as propane, butanes, pentanes and the like, as well as hydrogen, nitrogen, carbon dioxide and other gases. The present invention is generally concerned with the recovery of ethylene, ethane, propylene, propane and heavier hydrocarbons from such gas streams. A typical a...

Claims

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Application Information

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IPC IPC(8): F25J3/02
CPCF25J3/0209F25J3/0233F25J3/0238F25J3/0242F25J2200/02F25J2200/04F25J2200/70F25J2200/72F25J2200/74F25J2205/04F25J2215/62F25J2240/02F25J2245/02Y02C10/12Y02C20/40
Inventor TREBBLE, MARK A.
Owner TREBBLE MARK A
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