Comprehensive evaluation of an ionic liquid based deep purification process for NH3-containing industrial gas
Guoxiong Zhan1, Fei Cao2, Jianjun Chen1
1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
Journal of Environmental Sciences (China)
|November 3, 2023
Summary
Ionic liquids offer a greener method for ammonia (NH3) capture. A novel process using [C4im][NTF2] ionic liquid significantly reduces purification costs and CO2 emissions compared to conventional methods.
Area of Science:
- Chemical Engineering
- Environmental Science
- Materials Science
Background:
- Ammonia (NH3) emissions pose significant environmental challenges.
- Ionic liquids (ILs) present a promising, eco-friendly alternative for efficient NH3 capture.
Purpose of the Study:
- To rigorously simulate, optimize, and assess a novel deep purification process for NH3 using ILs.
- To evaluate the economic and environmental performance of the IL-based NH3 capture process.
Main Methods:
- Process simulation and optimization were performed using the ionic liquid [C4im][NTF2] as the absorbent.
- Three objective functions were used: total purification cost (TPC), total process CO2 emission (TPCOE), and thermal efficiency (ηeff).
Main Results:
- The novel IL-based process achieves lower TPC and TPCOE compared to benchmark processes at equivalent purification standards and recovery rates.
- Optimized process parameters yielded TPC of $0.02726/Nm3, TPCOE of 311.27 kg CO2/hr, and ηeff of 52.21%.
- The process offers substantial lifecycle savings, reducing purification costs by over $3 million and CO2 emissions by 10,000 tons compared to conventional methods.
Conclusions:
- The developed IL-based NH3 deep purification process is cost-effective and environmentally superior.
- This study provides a viable strategy and practical guidance for advanced NH3 capture technologies.
Related Concept Videos
01:17Precipitation and Co-precipitation
1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.8K
01:30Preparation of Amines: Alkylation of Ammonia and Amines
3.4K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.4K
01:09Ion-Exchange Chromatography
548
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
548
00:52Washing, Drying, and Ignition of Precipitates
925
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
925
01:25Basicity of Heterocyclic Aromatic Amines
6.1K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.1K
03:46Qualitative Analysis
22.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
22.4K