scholarly journals Comparison of the Economy and Controllability of Pressure Swing Distillation with Two Energy-Saving Modes for Separating a Binary Azeotrope Containing Lower Alcohols

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 730
Author(s):  
Lv ◽  
Li ◽  
Zhang ◽  
Huang
Keyword(s):  
Energy Saving ◽  
Simulation Analysis ◽  
Good Control ◽  
Total Annual Cost ◽  
Control Stage ◽  
Binary Azeotrope ◽  
Detailed Simulation ◽  
Pressure Swing ◽  
Pressure Swing Distillation ◽  
Selection Of

The pressure swing distillation (PSD) with two different energy-saving modes are put forward to separate a binary azeotrope containing lower alcohols: benzene/methanol. A comparison of the economy and controllability for the partial and fully heat integrated pressure swing distillation (HIPSD) is made by detailed simulation analysis. The optimal operating parameters of partial and fully HIPSD processes are obtained by minimizing total annual cost (TAC). These results show that the fully HIPSD mode saves 5.88% TAC compared with the partial HIPSD mode. Meanwhile, this paper proposes that the composition slope profile can help to select the temperature control stage (TCS), when the temperature profile in the column is rising rapidly near the bottom and the maximum of temperature slope value occurs in the bottom of the column. Several control structures are developed to check the rationality of the selection of the TCS and evaluate the industrial application. These results illustrate the composition/temperature cascade control structure for the PSD with two energy-saving modes can both get good control performances, and the purities of benzene and methanol can be brought close back to the initial value. However, the fully HIPSD mode can only handle much smaller composition disturbances (<10%) compared with the partial HIPSD mode. Therefore, the selection of energy-saving modes for the separation process should weigh economy against controllability.

scholarly journals Process Simulation of the Separation of Aqueous Acetonitrile Solution by Pressure Swing Distillation

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 409 ◽  
Author(s):  
Jing Li ◽  
Keliang Wang ◽  
Minglei Lian ◽  
Zhi Li ◽  
Tingzhao Du
Keyword(s):  
Acetonitrile Solution ◽  
Optimum Process ◽  
Total Annual Cost ◽  
Heat Integration ◽  
Reflux Ratio ◽  
Water Mixture ◽  
Aqueous Acetonitrile ◽  
Design Variables ◽  
Pressure Swing ◽  
Pressure Swing Distillation

The separation of aqueous acetonitrile solution by pressure swing distillation (PSD) was simulated and optimized through Aspen Plus software. The distillation sequence of the low pressure column (LPC) and high pressure column (HPC) was determined with a phase diagram. The pressures of the two columns were set to 1 and 4 atm, respectively. Total annual cost (TAC) was considered as the objective function, and design variables, such as the tray number, the reflux ratio, and the feeding position, were optimized. The optimum process parameters were obtained. For the reduction of energy consumption, the PSD with full-heat integration was designed. The TAC of this method is lower by 32.39% of that of the PSD without heat integration. Therefore, it is more economical to separate acetonitrile and water mixture by PSD with full-heat integration, which provides technical support for the separation design of such azeotropes.

A novel energy-saving pressure swing distillation process based on self-heat recuperation technology

Energy ◽  
2017 ◽  
Vol 141 ◽  
pp. 770-781 ◽  
Author(s):  
Hui Xia ◽  
Qing Ye ◽  
Shenyao Feng ◽  
Rui Li ◽  
Xiaomeng Suo
Keyword(s):  
Energy Saving ◽  
Distillation Process ◽  
Heat Recuperation ◽  
Pressure Swing ◽  
Pressure Swing Distillation

Exploration of a heat-integrated pressure-swing distillation process with a varied-diameter column for binary azeotrope separation

2019 ◽  
Vol 206 (12) ◽  
pp. 1689-1705 ◽  
Author(s):  
Yinglong Wang ◽  
Pengchao Qi ◽  
Xiao Yang ◽  
Zhaoyou Zhu ◽  
Jun Gao ◽  
...  
Keyword(s):  
Distillation Process ◽  
Binary Azeotrope ◽  
Pressure Swing ◽  
Pressure Swing Distillation

Separation of Binary Azeotrope Mixture via Pressure-Swing Distillation with Heat Integration

2011 ◽  
Vol 44 (12) ◽  
pp. 969-975 ◽  
Author(s):  
Keigo Matsuda ◽  
Kejin Huang ◽  
Koichi Iwakabe ◽  
Masaru Nakaiwa
Keyword(s):  
Heat Integration ◽  
Binary Azeotrope ◽  
Pressure Swing ◽  
Pressure Swing Distillation

scholarly journals Pengaruh Jenis Pelarut Pada Distilasi Ekstraktif Pemisahan Campuran Aseton-Metanol Dengan Dinding Pemisah

Eksergi ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 77
Author(s):  
Reynardi Risyad Raytama ◽  
Herry Santoso ◽  
Yansen Hartanto
Keyword(s):  
Dimethyl Sulfoxide ◽  
Annual Cost ◽  
Aspen Plus ◽  
Extractive Distillation ◽  
Payback Period ◽  
Total Annual Cost ◽  
Pressure Swing ◽  
Pressure Swing Distillation

Distilasi adalah pemisahan dua campuran atau lebih ke dalam fraksi komponennya dari kemurnian yang diinginkan berdasarkan perbedaan titik didih serta volatilitas antar komponen. Pemisahan dengan metode distilasi biasa tidak efektif untuk memisahkan campuran azeotrop. Oleh karena itu, menggunakan dengan metode pressure swing distillation, azeotrope distillation, dan extractive distillation. Aseton dan metanol merupakan campuran azeotrop yang harus dipisahkan dengan pelarut. Metode yang digunakan adalah distilasi ekstraktif dengan tiga entrainer yaitu air, chlorobenzene, dan dimethyl sulfoxide (DMSO). Kolom distilasi ekstraktif konvensional dapat dimodifikasi menjadi distillation wall column (DWC) dengan menambahkan dinding pemisah untuk mengurangi konsumsi energi dan penghematan biaya. Tujuan penelitian ini adalah menentukan jenis pelarut terbaik pada setiap sistem (kolom distilasi ekstraktif konvensional dan EDWC) dengan membandingan nilai ekonomis (biaya capital, biaya energi, dan nilai total annual cost). Penelitian dilakukan menggunakan Aspen Plus® untuk melakukan simulasi. Simulasi dengan menggunakan kolom dinding pemisah dilakukan dengan tiga kolom karena pada Aspen Plus® tidak tersedia kolom distilasi dengan dinding pemisah. Hasil simulasi menunjukkan bahwa jenis pelarut yang terbaik untuk memisahkan campuran azeotrope aseton dan methanol adalah DMSO dengan menggunakan sistem kolom distilasi ekstraktif konvensional. Biaya capital yang dihasilkan sebesar $653.999/tahun, Biaya Energi $3.245.929/tahun, dan Nilai TAC $3.899.927/tahun (payback period 3 tahun).

A Study on Sun Shading Reconstruction Design of Residential Buildings in Chongqing City

2014 ◽  
Vol 953-954 ◽  
pp. 1481-1487
Author(s):  
Liu Jin
Keyword(s):  
Energy Saving ◽  
Personal Experience ◽  
Design Pattern ◽  
Simulation Analysis ◽  
Residential Buildings ◽  
Residential Building ◽  
Specific Time ◽  
High Rise ◽  
Time Period ◽  
Chongqing City

Windows energy saving design of residential buildings has increasingly got the attention of people. Through a large number of surveys and analysis of residential buildings in Chongqing and consumers personal experience, the author finds problems and deficiency, and then proposes principles of residential buildings sun shading reconstruction in Chongqing city. Taking the high-rise residential building of one university in Chongqing as reconstruction sample, selecting a specific time period, the author recalculates sun shading coefficient with and without sun shading by using Ecotect software to do simulation analysis. Finally, the reasonable reconstruction design pattern is put forward through cases. Keywords: Buildings Sun Shading, Sun Shading Reconstruction, Energy Saving

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