Absorbent for deeply removing carbon dioxide

A carbon dioxide and absorbent technology, applied in the direction of absorption, reagents, inorganic chemistry, etc., can solve the problems of low gas purification and slow reaction speed, and achieve the effects of low operating costs, reduced corrosion, and reduced loss

Inactive Publication Date: 2009-02-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its weak alkalinity, this method also has disadvantages such as slow reaction speed and low gas purification degree.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0020] The preparation method of the absorbent for deep carbon dioxide removal of the present invention is characterized in that two or more alcohol amines and deionized water are mixed in a certain mass ratio at normal temperature and pressure, and then stirred evenly to form a mixed amine solvent.

[0021] The application of the absorbent for deep removal of carbon dioxide of the present invention in the purification of natural gas.

Embodiment 1

[0022] Embodiment one, the preparation of absorbent.

[0023] Choose a corrosion-resistant steel container, first add 5000 kg of deionized water, then weigh 3800 kg of MDEA and 1200 kg of DEA respectively; add 3800 kg of MDEA and 1200 kg of DEA to 5000 kg of deionized water, and stir at room temperature until Mix evenly to form a mixed amine liquid, which becomes the absorbent of the present invention.

Embodiment 2

[0024] Embodiment two, purifying natural gas

[0025] Use an existing set of 25000Sm 3 / h natural gas decarbonization device, which is mainly composed of absorption tower, flash tank, regeneration tower, reboiler, circulation pump and air cooler, among which absorption tower, flash tank, regeneration tower, reboiler, circulation Pump and air cooler etc. are existing commercially available products. The absorbent prepared in the embodiment one is fed into the absorption tower by the circulation pump, so that the circulation flow rate of the absorbent in the decarburization unit remains 90,000 kg / hour, and then feeds natural gas in the decarbonization unit, and the natural gas supply pressure is 4500kPaG, At a temperature of 45°C, CO in natural gas 2 The volume content of the natural gas is 10%, and the absorbent is in countercurrent contact with the natural gas to absorb the carbon dioxide in the natural gas. The volume content of the carbon dioxide in the purified natural ga...

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PUM

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Abstract

The invention provides an absorbent with deep removal of carbon dioxide, comprising water and alcohol amine; the improvement thereof is as follows, the alcohol amine is mixed solution of more than two types of alcohol amine, one of which is methyldiethanolamine (MDEA); the concentration by the weight percentage of the mixed alcohol amine solution is 45 percent to 50 percent; the concentration by the weight percentage of the methyldiethanolamine (MDEA) in the mixed alcohol amine solution is 30 percent to 40 percent; the absorbent is used in the deep removal technology of the carbon dioxide of natural gas, the content of the carbon dioxide in purified gas can be reduced to 50ppmv; the energy consumption of a reboiler of a regeneration tower can also be reduced, the degree of degradation and metamorphism of the absorbent can be reduced; the corrosion to a decarbonization system device and a pipeline can further be alleviated, the loss of the absorbent can be simultaneously reduced, the operation cost is low and the effect is satisfactory.

Description

technical field [0001] The invention relates to a decarburizing agent, in particular to an absorbent for deep removal of carbon dioxide applied to natural gas purification. Background technique [0002] As a clean energy source, natural gas is being used more and more widely. In order to facilitate transportation, natural gas often needs to be liquefied to reduce its volume. During the liquefaction process of natural gas, it needs to be cryogenically cooled to about -162°C in order to change from a gaseous state to a liquid state. In order to avoid freezing and blocking equipment and pipelines during the low-temperature liquefaction process, natural gas must be purified before liquefaction to remove acid gases (such as H 2 S, CO 2 etc.) and water. Because the temperature of natural gas liquefaction is very low, in order to prevent CO 2 Formation of dry ice at low temperatures clogs equipment and pipelines, requiring deep decarburization to make CO 2 The content is lowe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10C10K1/14B01D53/14C01B31/20C01B32/50
CPCY02C10/06Y02A50/20Y02C20/40Y02P20/151
Inventor 曾树兵陈文峰郭洲刘培林陈赓良
Owner CHINA NAT OFFSHORE OIL CORP
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