甲醇和三甲氧基硅烷共沸物分离过程模拟和优化

doi:10.16085/j.issn.1000-6613.2020-1153

摘要/Abstract

摘要：

三甲氧基硅烷（trimethoxysilane）是合成功能性有机硅化合物的重要中间体。在以甲醇和硅为原料合成三甲氧基硅烷的工业化生产过程中，过量的甲醇和产物三甲氧基硅烷会形成最高共沸物。本文探究了变压精馏、萃取精馏和隔壁塔萃取精馏三种分离提纯甲醇和三甲氧基硅烷的工艺，以最小年度总费用（TAC）为目标函数，运用混合整数非线性规划（MINLP）对三种流程进行了优化，比较了三种流程的效率和二氧化碳排放量。结果表明，与变压精馏相比，通过隔壁塔萃取精馏分离甲醇与三甲氧基硅烷共沸物具有明显的优势。分离100kmol/h甲醇（摩尔分数50.00%）和三甲氧基硅烷的TAC从198.84万美元/年降低到98.93万美元/年，降幅高达50.25%，效率从8.17%提高到13.82%，二氧化碳排放量从1217.53kg/h减少到684.22kg/h，减少了43.80%。

关键词: 共沸精馏, 隔壁塔, 三甲氧基硅烷, 甲醇, 过程优化, 最小年度总费用

Abstract:

Trimethoxysilane is an important intermediate for the synthesis of functional organosilicon compounds. In the industrial process of catalytic production of trimethoxylsilane, a maximum-boiling azeotrope of trimethoxylsilane and methanol can be formed due to the excessive methanol. Three processes, pressure-swing distillation, extractive distillation, and extractive dividing-wall column, were explored for the separation and purification of methanol and trimethoxysilane in this study. The processes were optimized in terms of the minimum total annual cost (TAC) through using the mixed integer nonlinear programming (MINLP). The corresponding exergy efficiency and carbon dioxide emissions were investigated. The results showed that the extractive dividing-wall column process had obvious advantages, comparing with the pressure-swing distillation. The TAC used for the separation of 100kmol/h methanol (molar ratio 50.00%) and trimethoxysilane decreased by 50.25% , accounting for a range from 198.84×10⁴USD/a to 98.93×10⁴USD/a. Meanwhile, the exergy efficiency was increased from 8.17% to 13.82%, and carbon dioxide emissions are decreased from 1217.53kg/h to 684.22kg/h, resulting in a decrease of 43.80%.

Key words: azeotrope distillation, dividing-wall column, trimethoxysilane, methanol, process optimization, minimum total annual cost(TAC)

中图分类号:

TQ-9

李乔, 田思琪, 冯泽民, 董立春. 甲醇和三甲氧基硅烷共沸物分离过程模拟和优化[J]. 化工进展, 2021, 40(5): 2431-2439.

LI Qiao, TIAN Siqi, FENG Zeming, DONG Lichun. Simulation and optimization for separation processes of methanol and trimethoxysilane azeotrope[J]. Chemical Industry and Engineering Progress, 2021, 40(5): 2431-2439.

图/表 9

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公用工程	单价/USD·GJ^-1
低压蒸气（433.15K,0.5MPa）	13.28^[23]
中压蒸气（457.15K,1.0MPa）	14.19^[23]
冷却水（进口温度303.15K；出口温度313.15K）	0.354^[23]

公用工程	单价/USD·GJ^-1
低压蒸气（433.15K,0.5MPa）	13.28^[23]
中压蒸气（457.15K,1.0MPa）	14.19^[23]
冷却水（进口温度303.15K；出口温度313.15K）	0.354^[23]

流程	最小分离功W_min/kW	损失功LW/kW	效率η/%	CO₂排放/kg·h^-1
变压精馏	96.11	1176.15	8.17	1217.53
双塔萃取精馏	90.14（-6.21%）	707.19（-39.87%）	12.75	755.10（-37.98%）
隔壁塔萃取精馏	88.55（-7.87%）	640.62（-45.53%）	13.82	684.22（-43.80%）

流程	最小分离功W_min/kW	损失功LW/kW	效率η/%	CO₂排放/kg·h^-1
变压精馏	96.11	1176.15	8.17	1217.53
双塔萃取精馏	90.14（-6.21%）	707.19（-39.87%）	12.75	755.10（-37.98%）
隔壁塔萃取精馏	88.55（-7.87%）	640.62（-45.53%）	13.82	684.22（-43.80%）

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