Box-Behnken效应面法优化基于离子交换的胺液净化工艺
1. 中海石油（中国）有限公司深圳分公司, 广东深圳 518067
2. 中海油天津化工研究设计院有限公司, 天津 300131
| 摘 要： | 针对中海石油某终端脱碳系统MDEA（N-甲基二乙醇胺）溶液在循环使用过程中，由于固体悬浮物及热稳定盐等杂质的产生、聚集，使得MDEA溶液质量劣化，导致脱碳系统管线设备堵塞、运行不稳定，进而影响溶液脱除CO2效果的问题，利用Box-Behnken效应面法对基于离子交换的胺液净化工艺的三个主要因素：胺液连续吸附时间、树脂再生温度和树脂再生时间进行了试验设计，并以净化后MDEA溶液的电导率为响应函数，建立了相应的数学模型，得到的回归方程相关系数R2（R2=0.9418）大于0.9，表明预测值与实验值具有较高的相关度，并以此优化了试验方法。得到的最佳试验条件为：胺液连续吸附时间为50 min、树脂再生温度40°C，树脂再生时间30 min。在此条件下净化后的MDEA溶液电导率为1.56 ms/cm，含盐量为0.8%。按照该方法重复3次实验，得到净化后的MDEA溶液含盐量均≯0.8%，达到工艺要求。因此，Box-Behnken实验设计法用于基于离子交换的胺液净化工艺优化筛选是可行的，数学模型的预测值与实验观察值相符。摘要部分将所有英文符号和数字改为了新罗马字体，与全文保持一致，不再单独标注。 |
| 关 键 词： | Box-Behnke效应面法; MDEA溶液; 树脂再生; 离子交换 |
| DOI： | 10.57237/j.wjese.2023.01.004 |
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收稿日期: 2022-12-02
接受日期: 2023-01-13
在线出版日期: 2023-02-03
Box-Behnken Response Surface Method to Optimize Amine Liquid Purification Process Based on Ion Exchange
1. Shenzhen Branch of CNOOC Ltd., Shenzhen 518067, China
2. CenerTech Tianjin Chemical Research and Design Institute Co., Ltd., Tianjin 300131, China
| Abstract: | In the process of recycling MDEA (N-methyldiethanolamine) solution in a terminal decarburization system of CNOOC, the quality of MDEA solution was deteriorated due to the generation and accumulation of impurities such as solid suspended solids and heat stable salts, which led to blockage and unstable operation of pipeline equipment in the decarburization system, thus affecting the CO2 removal effect of the solution, the Box-Behnken effect surface method was used to design the three main factors of the ion exchange-based amine purification process: the continuous adsorption time of the amine solution, the resin regeneration temperature and the resin regeneration time. Taking the conductivity of the MDEA solution after purification as the response function, a corresponding mathematical model was established to optimize the test method, and the correlation coefficient R2 (R2=0.9418) of the regression equation obtained was greater than 0.9, indicating that the predicted value had a high correlation with the experimental value, and the test method was optimized accordingly. The best test conditions obtained were: the continuous adsorption time of amine solution was 50 min, the resin regeneration temperature was 40°C, and the resin regeneration time was 30 min. Under this condition, the conductivity of the purified MDEA solution was 1.56 ms/cm, and the salt content was 0.8%. The experiment was repeated 3 times according to this method, and the salt content of the MDEA solution after purification was ≯0.8%, which met the technological requirements. The Box-Behnken experimental design method was feasible for amine solution purification process optimization screening based on ion exchange, and the predicted value of the mathematical model was consistent with the experimental observation value. |
| Keywords: | Box-Behnken Response Surface Method; MDEA Solution; Resin Regeneration; Ion Exchange |
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