最小二乘法在求解乙醇耦合制备C4烯烃最优条件中的应用
河南工业大学, 理学院, 河南郑州 450000
| 摘 要： | 节能是企业降本增效的重要手段。燃料乙醇生产过程涉及到多个工艺单元，包括生化反应、乙醇分离、以及联产品DDGS饲料生产等，需要消耗大量能源，相应的也会产生大量余热。通过热耦合技术将余热综合利用，能够显著降低热能消耗，节省生产成本，提高企业综合效益。本文专注于应用最小二乘法探究乙醇偶合制备C4烯烃的最优条件来探索乙醇催化耦合制备烯烃的工艺条件。对比在只改变该变量的情况下，变量与烯烃收率的关系，运用Matlab和Mathematica数学软件对实验数据采用插值法，拟合关系曲线，建立最小二乘法的模型，以此来指导生产。将得到的函数关系与实验数据进行比对，其模拟的误差在可接受范围内，所建立的模型可以较好地预测不同变量时的烯烃收率。研究表明，在反应温度不受限的情况下，可使乙醇转化率达到99.03%，C4烯烃选择性达到58.09%，生产收率达到57.52%；在反应温度须小于350°C的情况下，可使乙醇转化率达到54.33%，C4烯烃选择性达到38.52%，生产收率达到20.93%，最后发现温度对生产有着重要影响，实际生产时应保持最大温度。以期为我国燃料乙醇产业发展提供参考。 |
| 关 键 词： | 乙醇耦合制备烯烃; 控制变量法; 最小二乘法; 线性规划; 插值法 |
| DOI： | 10.57237/j.wjms.2022.01.002 |
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收稿日期: 2022-09-29
接受日期: 2022-11-07
在线出版日期: 2022-12-01
Study on Ethanol Coupling Preparation of Olefins Based on Regression Analysis Model
College of Science, Henan University of Technology, Zhengzhou 450000, China
| Abstract: | Energy conservation is an important means for enterprises to reduce costs and increase efficiency. The fuel ethanol production process involves multiple process units, including biochemical reaction, ethanol separation, and co product DDGS feed production, which requires a large amount of energy consumption and correspondingly generates a large amount of waste heat. The comprehensive utilization of waste heat through thermal coupling technology can significantly reduce heat energy consumption, save production costs and improve the comprehensive benefits of enterprises. This paper focuses on the application of least square method to explore the preparation of C by ethanol coupling_ 4. The optimum conditions of olefins were studied to explore the process conditions of ethanol catalytic coupling to olefins By comparing the relationship between the variable and olefin yield when only the variable is changed, the experimental data are interpolated by using Matlab and Mathematica mathematical software to fit the relationship curve, and a model of least square method is established to guide production Comparing the obtained functional relationship with the experimental data, the simulation error is within an acceptable range. The established model can better predict the olefin yield under different variables The results showed that the conversion of ethanol could reach 99.03%, C4 olefin selectivity could reach 58.09%, and the yield could reach 57.52% without limiting the reaction temperature; Under the condition that the reaction temperature must be less than 350°C, the ethanol conversion rate can reach 54.33%, C4 olefin selectivity can reach 38.52%, and the production yield can reach 20.93%. Finally, it is found that temperature has an important impact on production, and the maximum temperature should be maintained during actual production. It is expected to provide reference for the development of China's fuel ethanol industry. |
| Keywords: | Preparation of Olefins by Ethanol Coupling; Control Variable Method; Least Square Method; Linear Programming; Interpolation Method |
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