| 摘要: |
| 目的 解决传统泡沫过于稳定，消泡困难等问题。方法 采用N-十二烷基-1,3-丙二胺与耐温耐盐型阴离子表面活性剂复配，制备一种CO2响应型耐温耐盐复配泡沫体系，并采用分子模拟探究了复配泡沫的稳定性和响应机理。结果 N-十二烷基-1,3-丙二胺具有良好的质子化性能和耐盐性能，但其耐温性能较差，且不具备响应性能。将其与十二烷基硫酸钠（SDS）和十二烷基磺酸钠复配后，高温下起泡速度提高了40%，泡沫存在时间达到复配前的3.17倍，耐温性显著提升，且具有良好的CO2响应性能。分子模拟研究发现，通入CO2后，液膜内SDS中含S原子基团与C12N(CH3)N(CH3)2中带正电荷的N原子基团相结合，从而失去表面活性，导致泡沫的稳定性变差，这也是响应消泡的原因。结论 该复配体系具有良好的耐温耐盐性能和响应性能，能够在苛刻环境下完成泡沫排水采气后实现响应消泡，具有广阔的应用前景。 |
| 关键词: CO2响应型泡沫 表面活性剂 耐温耐盐 分子模拟 |
| DOI：10.3969/j.issn.1007-3426.2024.04.010 |
| 分类号: |
| 基金项目:国家自然科学基金面上项目“新型CO2响应型耐温抗盐泡排体系的设计、作用机理和应用研究”（51874331） |
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| Performance and response mechanism of CO2 responsive tertiary amine foam with temperature and salt tolerance |
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Xiumin WANG, Jianpeng CUI, Zhikun WANG, Shuangqing SUN
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School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong, China
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| Abstract: |
| Objective In order to solve the problems such as too stable traditional foam and difficulty in defoaming.Method Using N-dodecyl-1,3-propanediamine and temperature and salt tolerant anionic surfactant to prepare a CO2 responsive temperature and salt tolerance composite foam system, and uses molecular simulation to explore the stability and response mechanism of the composite foam. Results Results show that N-dodecyl-1,3-propanediamine has good protonation and salt tolerance properties. However, its temperature tolerance is poor, and it does not have response performance. After compounding with sodium dodecyl sulfate (SDS) and sodium dodecyl sulfate, the foaming speed at high temperature is increased by 40%, the foam duration is 3.17 times longer than that before compounding, the temperature resistance is significantly improved, and the foam is defoamed rapidly within a short period after passing CO2. Molecular simulation studies reveal that the S atomic groups contained in SDS will combine with the positively charged N atomic groups in C12N(CH3)N(CH3)2 and lose surface activity, resulting in poor stability of the foam, which is also responsible for the responsive defoaming. Conclusion The composite system has good temperature and salt resistance and responsiveness, and can realize responsive defoaming after foam drainage and gas production in harsh environments which has broad application prospects. |
| Key words: CO2 responsive foam surfactant temperature and salt tolerance molecular simulation |
