Process design and optimization of industrial byproduct methyl acetate to <italic style="font-style: italic">n</italic>-propyl acetate

CHEN Yushi; ZHANG Chundong

doi:10.12434/j.issn.2097-2547.20230200

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Process design and optimization of industrial byproduct methyl acetate to n-propyl acetate

- Process design and optimization of industrial byproduct methyl acetate to n-propyl acetate
- Vol. 48, Issue 5, Pages: 176-181(2023)
- 作者机构：
  
  1.石化盈科信息技术有限责任公司过程控制事业部，上海 200050
  2.南京工业大学化工学院，材料化学工程国家重点实验室，江苏南京 211816
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20230200
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CHEN Yushi, ZHANG Chundong. Process design and optimization of industrial byproduct methyl acetate to n-propyl acetate. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):176-181(2023)
DOI：

CHEN Yushi, ZHANG Chundong. Process design and optimization of industrial byproduct methyl acetate to n-propyl acetate. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):176-181(2023) DOI： 10.12434/j.issn.2097-2547.20230200.

摘要

工业生产精对苯二甲酸的过程中会产生大量醋酸甲酯。为实现醋酸甲酯的有效利用，提出了一种利用酯交换和反应精馏技术的工艺，将醋酸甲酯和正丙醇转化为高附加值的醋酸正丙酯和甲醇，并进行了稳态建模计算。为降低产品分离过程的公用工程消耗，进一步采用变压精馏和热集成技术，对醋酸甲酯处理量为50 kmol/h的工艺进行了优化设计，并从技术（系统能耗和CO,2,排放量）和经济（年均总成本）两方面对优化前后的工艺进行了比较。结果表明，优化前，工艺的系统能耗为7.85 MW，CO,2,排放量为1.33 × 10,4, t/a，年均总成本为4.71 × 10,6, CNY/a；优化后，工艺的系统能耗降至4.44 MW，CO,2,排放量降至0.75 × 10,4, t/a，年均总成本降至3.29 × 10,6, CNY/a。本研究可为醋酸甲酯的高效利用和醋酸正丙酯的工业生产提供参考。

Abstract

In the industrial production of purified terephthalic acid, a significant amount of methyl acetate is generated as a byproduct. To efficiently utilize methyl acetate, a process utilizing transesterification and reactive distillation technologies has been proposed to convert methyl acetate and ,n-,propanol into high-value ,n,-propyl acetate and methanol, with rigorous steady-state modeling. To reduce utility consumptions during the separation process, pressure swing distillation and heat integration technologies were further employed to optimize the process with a feedstock of 50 kmol/h of methyl acetate. A comparative analysis of the process before and after optimization was conducted from both technical (systematic energy consumptions and CO,2, emissions) and economic (total annual costs) perspectives. The results show that prior to optimization, the systematic energy consumptions of the process are 7.85 MW, CO,2, emissions amount to 1.33 × 10,4, t/a, and the total annual cost is 4.71 × 10,6, CNY/a. However, following optimization, systematic energy consumptions decrease to 4.44 MW, CO,2, emissions are reduced to 0.75 × 10,4, t/a, and the total annual cost decrease to 3.29 × 10,6, CNY/a. This study serves as a reference for the efficient utilization of methyl acetate and the industrial production of ,n,-propyl acetate.

关键词

酯交换醋酸正丙酯反应精馏变压精馏技术经济分析

Keywords

transesterificationn-propyl acetatereactive distillationpressure swing distillationtechno-economic analysis

references

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Process design and optimization of industrial byproduct methyl acetate to n-propyl acetate

DOI：10.12434/j.issn.2097-2547.20230200

摘要

Abstract

关键词

Keywords

references