氨基酸辅助的同时CO2吸收和矿物碳化:不同类别氨基酸的影响
Yafei Mao1, Xing Yang1, Tom Van Gerven1
1Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
Environmental science & technology
|July 11, 2023
概括
本研究探讨了使用不同氨基的二氧化碳捕获-矿物碳化 (CCMC). 甲基乙醇胺 (DEAE) 显示出理想的性能,在最佳条件下实现100%的碳化效率.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 二氧化碳捕获-矿物碳化 (CCMC) 是一种使用性流的混合技术.
- 缺乏关于CCMC机制,氨基选择和参数灵敏性的综合研究.
研究的目的:
- 研究CCMC机制与不同类型的氨基 (初级,二级,三级,三胺).
- 分析像氨基度和温度这样的参数的灵敏度.
- 确定有效的CCMC的最佳条件和氨基.
主要方法:
- 检查的代表性氨基:乙醇胺 (MEA),二醇胺 (DIPA),二甲基乙醇胺 (DEAE) 和二甲基胺 (DETA).
- 模拟的性资源使用化.
- 分析了多步反应机制和晶体转化 (瓦特里特到石/阿拉戈尼特).
主要成果:
- 氨基度高于2mol/L,由于水合,DEAE吸收效率降低.
- 氨基度增加导致DEAE的碳化效率达到100%,但DETA的转化率较低.
- 在碳化中,DEAE的温度灵敏度最低.
- 由DEAE生产的瓦特里特完全转化为石/阿拉戈尼特,与DETA生产的瓦特里特不同.
结论:
- 在合理选择的条件下,二甲基乙醇胺 (DEAE) 是CCMC的理想选择.
- 结果为设计未来的CCMC流程提供了理论基础.
- 优化氨基度和温度对于高效的CCMC至关重要.
相关概念视频
01:25Basicity of Heterocyclic Aromatic Amines
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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).
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01:21Basicity of Aliphatic Amines
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Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates...
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates...
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01:07Amines: Introduction
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Amines are organic derivatives of ammonia. They are formed by replacing one or more ammonia protons with alkyl or aryl groups. Depending upon the number of organyl groups bonded to nitrogen, amines are classified as primary, secondary, or tertiary. Primary amines have one organyl group attached to the nitrogen atom, while secondary and tertiary amines have two and three organyl groups attached to the nitrogen atom, respectively.
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01:26Physical Properties of Amines
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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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01:24Carbonation Shrinkage
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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
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169
01:38Preparation of Amines: Reductive Amination of Aldehydes and Ketones
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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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