Composite decarbonization solvent for eliminating carbon dioxide in natural gases

A carbon dioxide and natural gas technology, applied in the direction of gas fuel, chemical instruments and methods, through absorption, etc., can solve the problems of increased solution loss, unstable thermal degradation of diethanolamine, and large solvent loss, etc., to achieve lower regeneration temperature and regeneration Energy consumption, reduced solution circulation energy consumption, and strong solution absorption capacity

Active Publication Date: 2010-09-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since ethylenediamine derivatives are more alkaline than monoethanolamine, it is difficult to regenerate and restore, resulting in solvent loss and accelerating equipment corrosion
At the same time, monoethanolamine has a higher vapor pressure than other amines, high regeneration temperature, high evaporation loss, and high energy consumption; diethanolamine is unstable to thermal degradation and is prone to degradation loss during regeneration; piperazine has a low boiling point, Only 148°C, easy to volatilize, at the same time, the concentration of piperazine in the decarburization solution should not be too high, otherwise, the loss of solvent will be large, and the equipment and pipel

Method used

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  • Composite decarbonization solvent for eliminating carbon dioxide in natural gases
  • Composite decarbonization solvent for eliminating carbon dioxide in natural gases
  • Composite decarbonization solvent for eliminating carbon dioxide in natural gases

Examples

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Effect test

Embodiment 1

[0041] Embodiment 1: A compound type decarburization solvent for removing carbon dioxide in natural gas consists of the following components:

[0042] 910 kilograms of N-methyldiethanolamine solvent, the mass percentage of N-methyldiethanolamine in this solvent is 99.0%~99.5%;

[0043] Activator: 70 kg of piperazine, 5 kg of N-methyl monoethanolamine, 5 kg of diglycolamine;

[0044] Antifoaming agent: 4 kg of simethicone oil;

[0045] Corrosion inhibitor: 3 kilograms of methylthiourea;

[0046] Antioxidant: 4-methoxyphenol 3 kg.

[0047] The preparation method of the composite type decarburization solvent for removing carbon dioxide in natural gas, the steps are:

[0048] 1) Add the activator, antifoam agent, corrosion inhibitor and antioxidant to the N-methyldiethanolamine solvent;

[0049] 2) Mix according to the above mass ratio at normal temperature and pressure, and form a compound high-efficiency decarburization solvent for removing carbon dioxide in natural gas after ...

Embodiment 2

[0050] Embodiment 2: A compound type decarburization solvent for removing carbon dioxide in natural gas consists of the following components:

[0051] 964.5 kilograms of N-methyldiethanolamine solvent, the mass percentage of N-methyldiethanolamine in this solvent is 99.0%~99.5%;

[0052] Activator: 30 kg of piperazine, 2 kg of N-methyl monoethanolamine, 2 kg of diglycolamine;

[0053] Antifoaming agent: 0.5 kg of simethicone oil;

[0054] Corrosion inhibitor: 0.5 kg of thiourea;

[0055] Antioxidant: Diethylglycine 0.5 kg.

[0056] Its preparation method is with embodiment 1.

Embodiment 3

[0057] Embodiment 3: A compound type decarburization solvent for removing carbon dioxide in natural gas consists of the following components:

[0058] 925 kilograms of N-methyldiethanolamine solvent, the mass percent of N-methyldiethanolamine in this solvent is 99.0%~99.5%;

[0059] Activator: 60 kg of piperazine, 4 kg of N-methyl monoethanolamine, 4 kg of diglycolamine;

[0060] Antifoaming agent: 3 kg of simethicone;

[0061] Corrosion inhibitor: 2 kilograms of methylthiourea;

[0062] Antioxidant: 4-methoxyphenol 2 kg.

[0063] Its preparation method is with embodiment 1.

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Abstract

The invention discloses a composite decarbonization solvent for eliminating carbon dioxide in natural gases, consisting of the following components in percentage by weight: 91.00%-96.45% of N-methyldiethanolamine solvent, 3.4%-8% of activator, 0.05%-0.4% of foam inhibiting agent, 0.05%-0.3% of corrosion inhibitor and 0.05%-0.3% of antioxidant. The invention has the advantages that the composite decarbonization solvent improves reaction rate of the composite decarbonization solvent and the carbon dioxide, increasing adsorption amounts; reduces circulation quantity of a decarbonization solution, decreasing energy consumption of solution circulation; reduces the degradation of the decarbonization solvent, lowering consumption of the decarbonization solvent; and at the same time, the composite decarbonization solvent improves corrosion resistance, oxidation resistance and foaming resistance of the decarbonization solution.

Description

technical field [0001] The invention relates to a decarburization solvent, in particular to a composite decarburization solvent for removing carbon dioxide in natural gas. Background technique [0002] At present, to remove carbon dioxide in natural gas, aqueous alcohol amine solution is commonly used as absorbent. The molecular structure of alcohol amine compounds contains at least one hydroxyl group and one amine group. The role of the former is to reduce the vapor pressure of the compound and increase its water solubility; while the latter provides the necessary alkalinity for the aqueous solution and promotes the absorption of acidic gas components. The alcohol amine solution reacts with the carbon dioxide in the natural gas to form carbamate and carbonate compounds, thereby purifying the natural gas. [0003] Most of the existing decarburization solvents use N-methyldiethanolamine as the main component. Since there is no active H atom in the molecule of N-methyldieth...

Claims

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Application Information

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IPC IPC(8): B01D53/14C10L3/10
CPCY02C10/06Y02C20/40
Inventor 刘家洪宋德琦陈运强向波王远江胡平张津杨晓秋秦兴述郭成华卢任务孙林冼祥发李海荣杜通林胡益武陈彰兵李唯缪晖杜毅陆永康康洪波
Owner BC P INC CHINA NAT PETROLEUM CORP
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