Compound decarburization solution for removing carbon dioxide in natural gas and preparation method thereof

Abstract

Disclosed is a compound decarburization solution for removing carbon dioxide in natural gas and a preparation method thereof. The compound decarburization solution comprises, by weight, 28.0% to 55.0% of N- methyl diethanolamine, 4.0% to 12.0% of an activating agent, 0.1% to 2.0% of a corrosion inhibitor, 0. 02% to 0.2% of a stabilizing agent, and 0.01% to 0.1% of a defoaming agent, with the balance being water. The preparation method includes feeding nitrogen into a reaction still before preparation; setting the temperature of the reaction still, adding the N- methyl diethanolamine and the water and stirring the mixture; adding the activating agent, the corrosion inhibitor, the stabilizing agent and the defoaming agent into the reaction still; stirring the mixture till the mixture is uniform, and performing discharge to obtain the product compound decarburization solution. According to the compound decarburization solution for removing carbon dioxide in natural gas and the preparation method thereof, the preparation process is protected by the nitrogen; the compound decarburization solution has the advantages of being high in absorption load of carbon dioxide, low in corrosion, high in thermo-stability, little in degradation loss and low in regeneration power consumption, and capable of obtaining purified natural gas and high-purity carbon dioxide while used in the natural gas processing; the whole process is protected by the nitrogen in the preparation, and oxygen is prevented from contacting with the solution, accordingly, risks of solution degradation and ineffectiveness of the stabilizing agent are reduced, and the oxygen content and the corrosion of decarburization devices are decreased.

Description

technical field [0001] The invention relates to gas separation and purification technology, in particular to a composite decarburization solution for removing carbon dioxide in natural gas used for natural gas purification treatment and a preparation method thereof. Background technique [0002] Natural gas is a high-quality fuel. Compared with coal and oil, it has the characteristics of high combustion efficiency, cleanness and no pollution. In recent years, my country's natural gas reserves, production and consumption have continued to increase, and natural gas has entered a period of rapid development. The main component of natural gas is methane, followed by ethane, propane, butane, etc. In addition, it also contains carbon dioxide and other components. The existence of carbon dioxide will not only cause corrosion of equipment and pipelines in the process of mining, processing, storage and transportation, but also When used as fuel, it will also reduce the calorific valu...

AI Technical Summary

Problems solved by technology

Although the various existing MDEA decarburization solutions have their own advantages, there are still problems such as low absorption load, large solution circulation, and easy foaming of the solution.

However, in actual production, many natural gas decarbonization devices have more or less problems such as equipment corrosion, solution oxidative degradation, and solution foaming. Domestic decarbonization solutions cannot fully meet the production process requirements for natural gas decarbonization. MDEA decarbonization The formulation of the solution needs further research and optimization

[0006] For this reason, most of the MDEA decarbonization solutions used in domestic natural gas decarbonization devices are imported products. Due to the influence of import tariffs and patent royalties, the decarbonization solutions are expensive, and there are also problems such as cumbersome procurement procedures and long delivery cycles; However, some natural gas decarbonization devices that use domestic MDEA decarbonization solutions have problems such as unstable operation of the device, corrosion of equipment, and large volume of solution circulation.

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