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Recovery of carbon dioxide at high pressure

A technology of carbon dioxide and high pressure, applied in alkali metal oxides/hydroxides, inorganic chemistry, carbon compounds, etc., can solve problems such as waste

Inactive Publication Date: 2002-07-24
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This creates a huge waste due to the large amount of energy expended on nitrogen compression

Method used

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  • Recovery of carbon dioxide at high pressure

Examples

Experimental program
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Effect test

Embodiment Construction

[0010] The following description is with reference to Figure 1, which is a flow chart of the improved alkanolamine-based adsorption process of the present invention for the recovery of CO at high pressure from a low-pressure stream such as flue gas. 2 . It is possible that the flow chart is different from the equipment used. Also, the temperature and pressure values ​​in the description below are simply indicative of typical operating conditions.

[0011] Gaseous feed stream 1 contains CO containing 2 logistics. Typically, feed stream 1 also contains nitrogen and oxygen. CO 2 The content of fluoride is generally up to 30% (unless otherwise stated, all percentages here are volume percentages), generally 3 to 30 volume%, which is typical in flue gas. Feed stream 1 is usually properly cooled and pretreated to remove particulates and impurities such as SO x and NO x . The feed stream is fed to blower 2 and directly through line 3 to adsorber 4 where the feed stream is mixe...

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Abstract

Disclosed is process for recovering carbon dioxide, comprising (A) providing a gaseous feed stream comprising carbon dioxide, wherein the pressure of said feed stream is up to 30 psia; (B) preferentially absorbing carbon dioxide from said feed stream into a liquid absorbent fluid to form a carbon dioxide enriched liquid absorbent stream; (C) in any sequence or simultaneously, pressurizing said carbon dioxide enriched liquid absorbent stream to a pressure sufficient to enable the stream to reach the top of the stripper at a pressure of 35 psia or greater, and heating the carbon dioxide enriched liquid absorbent stream to obtain a heated carbon dioxide enriched liquid absorbent stream; and (D) stripping carbon dioxide from said carbon dioxide enriched liquid absorbent stream in a stripper operating at a pressure of 35 psia or greater and recovering from said stripper a gaseous carbon dioxide product stream having a pressure of 35 psia or greater. In another aspect of this process, the stripped liquid absorbent fluid from the stripper is recycled to step (B).

Description

technical field [0001] The present invention relates to a process for recovering carbon dioxide from a gas stream containing carbon dioxide. Background technique [0002] Traditional commercial liquid carbon dioxide is produced from a feed gas stream with a high carbon dioxide content (>95%) using distillation techniques. Examples of these sources include ammonia and hydrogen plant off-gases, fermentation sources and naturally occurring gases from wells rich in carbon dioxide. Liquid CO2 is typically made at a central plant and shipped to users who may be hundreds of miles away; thus requiring high shipping costs. The scarcity of high-quality production material sources and the distance from the user provide the opportunity to recover CO from low-concentration material sources. 2 The power of this low-concentration material can usually be closer to the user's location. Primary examples of these sources are flue gases, which contain 3 to 30% CO, depending on the fuel an...

Claims

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Application Information

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IPC IPC(8): B01D19/00B01D3/00B01D53/14C01B32/50
CPCY02C10/06B01D53/1475B01D53/1418Y02C20/40
Inventor S·查克拉瓦蒂A·古普塔
Owner PRAXAIR TECH INC