Application of Dimethylethanolamine in Nitrogen Synthesis Industry MDEA Decarbonization Process

Application of Dimethylethanolamine in Nitrogen Synthesis Industry MDEA Decarbonization Process

China is a large agricultural country, and with the development of agriculture, the demand for fertilizers is increasing, and the demand for synthetic ammonia is also increasing. In the production process of synthetic ammonia, removing CO2 is a relatively important process, which accounts for about 10% of the total energy consumption. The overall energy consumption level of China's synthetic ammonia process is relatively high. Although it has decreased after transformation, for small and medium-sized fertilizer plants, decarbonization technology is very backward in the entire synthetic ammonia process, and has become a limiting factor in reducing the overall level of synthetic ammonia cost, Therefore, choosing a suitable low energy decarbonization process will have profound practical significance.

In the early 1970s, the MDEA decarbonization process was first industrialized in the United States and Germany, and gradually promoted and applied among developed countries. China began to introduce the MDEA production process in the mid-1980s and applied it to the decarbonization process of synthetic ammonia in the early 1990s. The MDEA decarbonization process has become one of the most economical decarbonization processes in the world. Dimethylethanolamine will be widely used in China.

The MDEA decarbonization process refers to using MDEA aqueous solution as an absorbent,

Add a certain amount of activator to absorb CO2 from the synthetic ammonia conversion gas under pressure conditions. The rich liquid absorbed by MDEA is regenerated under reduced pressure to precipitate CO2, H2S, etc. The purity of CO2 can reach 98% and can be directly used as a commodity or synthetic urea raw material.

MDEA decarbonization process is divided into "semi decarbonization" and "full decarbonization" processes

"Half removal" refers to the removal of 1/3 to 2/3 of CO2 from the shift gas. For manufacturers of co producing liquid ammonia, this process can achieve good economic results.

"Total removal" refers to the complete removal of CO2 from the shift gas, resulting in a CO2 content of ≤ 011% in the purified gas and good desulfurization effect, with a total sulfur content of ≤ 5ppm in the purified gas. This process is more suitable for methanol co production manufacturers.

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