Novel high-efficient compound decarbonization solvent

Abstract

The invention discloses a novel high-efficient compound decarbonization solvent which comprises N-methyldiethanolamine and an active agent. The active agent is a mixture which consists of at least two of N-hydroxyethyl morpholine, 2-amino-2-methyl-1-propanol and piperazine, wherein the weight ratio of the N-hydroxyethyl morpholine is 80 to 90 percent; the weight ratio of the active agent is 10 to20 percent and a defoaming agent is also added into the compound decarbonization solvent. The novel high-efficient compound decarbonization solvent has the advantages of high carbon dioxide absorption capacity, high purification degree, low regeneration energy consumption, and no foams after long-term use of the decarbonization solvent.

Description

technical field [0001] The invention relates to a decarburization solvent, in particular to a decarburization solvent for separating and removing carbon dioxide from mixed gas. Background technique [0002] In the production of synthetic ammonia, the raw material gas contains 15% to 40% of carbon dioxide, which needs to be purified to 0.2% or lower to meet the requirements of the synthesis process. Synthetic ammonia is high energy consumption, and the energy consumption of the decarbonization process is about 15% of the total energy consumption. Therefore, the energy consumption of decarbonization has a great impact on the cost of synthetic ammonia. [0003] In the decarburization process of synthetic ammonia, the solvent absorption method is usually used, which is generally divided into chemical absorption, physical absorption and physical chemical absorption. The physical absorption method is to select a specific solvent. Under the condition of high pressure and low tempe...

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Problems solved by technology

[0006] Among the above-mentioned activators, morpholine, dimethylethanolamine, methylethanolamine, and piperazine have lower boiling points (between 128°C and 160°C), but during the solution regeneration process, their volatility is large and the loss is large, which affects desorption. Carbon system stability; although diethanolamine has a high boiling point, it is easy to oxidative and thermal degradation, its alkalinity is strong, and it has a strong binding force with carbon dioxide, which requires high regeneration energy consumption

Furthermore, after long-term use of the decarburization solvent, the light components produced by the degradation of the solution and the accumulation of fine particles from the raw material gas will cause solvent pollution and foaming, which will affect the operation of the decarburization system and the effect of solvent use

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