乙酰丙酸乙酯的反应精馏模型及隔壁塔节能优化设计

doi:10.16085/j.issn.1000-6613.2021-0919

摘要/Abstract

摘要：

乙酰丙酸乙酯是一种潜在的生物质基平台化合物，在工业上具有很高的应用价值。乙酰丙酸乙酯传统的生产方法主要为间歇反应法，效率较低，产物分离困难且工艺流程较长。因此，本文提出了反应精馏工艺生产乙酰丙酸乙酯，在以中试实验结果为依据的基础上，使用Aspen Plus模拟软件建立了工艺流程，并考察了回流比、进料位置、进料摩尔比以及理论塔板数等关键参数，得到了常规单塔反应精馏工艺生产乙酰丙酸乙酯的最优配置。而后，为了得到纯度大于99.9%的乙酰丙酸乙酯，本文进一步提出了反应精馏双塔精制流程以及反应精馏隔壁塔流程，并通过对两种流程所得到的产品纯度以及能耗的对比，验证了反应精馏隔壁塔工艺生产乙酰丙酸乙酯的有效性以及在节能方面较大的优势。

关键词: 反应精馏隔壁塔, 反应精馏, 优化, 模拟

Abstract:

Ethyl levulinate is a potential biomass-based platform compound, which has a wide application in chemical industry. The traditional methods for manufacturing ethyl levulinate are mainly in a batch reactor, which had a low efficiency, difficult in product separation and a long technological process. Therefore, a reactive distillation process in producing ethyl levulinate was proposed. Based on the results of pilot-scale experiments, the reactive distillation technological process was established using Aspen Plus simulation software, the key parameters, such as reflux ratio, feeding position, feed mole ratio and theoretical stage numbers were investigated, and the optimal configuration for the synthesis of ethyl levulinate using conventional reactive distillation technology was obtained. In order to obtain ethyl levulinate with a purity higher than 99.9%, the double column reactive distillation purification process and the reactive dividing-wall distillation process were further proposed, and through the comparison of product purity and energy consumption of these two processes, the effectiveness of reactive dividing-wall distillation process in producing ethyl levulinate was verified and its energy saving effect was demonstrated.

Key words: reactive distillation dividing wall column, reactive distillation, optimization, simulation

中图分类号:

TH028

韩文韬, 韩振为, 李洪, 高鑫, 李鑫钢. 乙酰丙酸乙酯的反应精馏模型及隔壁塔节能优化设计[J]. 化工进展, 2022, 41(4): 1759-1769.

HAN Wentao, HAN Zhenwei, LI Hong, GAO Xin, LI Xingang. Simulation of reactive distillation for the synthesis of ethyl levulinate and energy saving optimization of dividing wall column[J]. Chemical Industry and Engineering Progress, 2022, 41(4): 1759-1769.

图/表 23

表1 体系的物性数据

组分	沸点/℃	摩尔质量/g?mol^-1
LA	245~246	116.12
乙醇	78	46.07
LAEE	205~206	144.17
水	100	18.02
乙醇-水	78.15	—

图1 反应精馏过程模拟流程

图2 塔内温度分布以及浓度分布的模拟及实验结果（进料摩尔比2.5）

图3 塔内温度分布以及浓度分布的模拟及实验结果（进料摩尔比3.5）

图4 回流比对乙酰丙酸转化率以及再沸器负荷的影响

图5 不同回流比下的塔内浓度分布

图6 乙醇进料位置对乙酰丙酸转化率以及再沸器负荷的影响

图7 不同进料位置下的塔内浓度分布

图8 进料摩尔比对LA转化率以及再沸器负荷的影响

图9 不同醇酸摩尔比下的塔内浓度分布

图10 精馏段和提馏段塔板数对LA转化率及再沸器负荷的影响

图11 反应段塔板数对LA纯度以及再沸器负荷的影响

图12 不同反应段塔板数下的塔内浓度分布

图13 优化后的反应精馏塔最佳配置

图14 最佳配置下的浓度分布与温度分布

图15 反应精馏隔壁塔示意图以及所构建模拟流程

图16 乙醇进料位置的影响

图17 主塔回流比的影响

图18 副塔回流比的影响

图19 气相分配比的影响

图20 醇酸进料摩尔比的影响

图21 常规反应精馏双塔精制流程

表2 反应精馏双塔精制流程与反应精馏隔壁塔流程对比

反应精馏双塔精制		反应精馏隔壁塔流程
参数	值	参数	值
乙醇进料量/g?h^-1	179.64	乙醇进料量/kg?h^-1	179.64
LA进料量/g?h^-1	129.36	LA进料量/kg?h^-1	129.36
RD塔回流比	1.0	RD-1塔回流比	1.0
RC塔回流比	1.0	RD-2塔回流比	1.0
LA进料位置	4	LA进料位置	4
乙醇进料位置	21	乙醇进料位置	16
RC塔粗LAEE进料点	4	气相分配比	0.7
RD塔板数	25	主塔塔板数	25
RC塔板数	8	副塔塔板数	8
LAEE质量分数	0.9924	LAEE质量分数	0.9997
总能耗/W	252.43	总能耗/W	220.61

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