Pressure swing distillation for the separation of methyl acetate‐methanol azeotrope

Abstract

Pressure swing distillation (PSD) process was used to separate methyl acetate‐methanol azeotrope. Through the phase diagram analysis, distillation sequence and technological process were determined. On the basis of the principle of the minimum total annual cost (TAC), design variables such as feeding position, reflux ratio, and column plate number were optimized and the optimal parameters were determined. The high‐pressure column (HPC) under various pressures were analysed. The economic results of the PSD without heat integration, with partial heat integration, and with full heat integration were compared. The comparison results indicate that the TAC of the PSD without heat integration is the highest. The PSD with partial integration and full heat integration can effectively reduce the total capital cost and total operating cost. Compared with the PSD without heat integration, the TACs of partial heat integration and full heat integration exhibit 27% and 30% savings, respectively. Therefore, the PSD with full heat integration is more economically reasonable for separating methyl acetate‐methanol azeotrope.

Reducing CO2 emissions and process cost in vinyl acetate/acetic acid/acetic anhydride ternary mixture via heat pumps with heat exchange network

“…Separation of ternary system is a common and typical process in chemical separation process. Recently, there are many researches [5][6][7][8][9][10][11] relating to the separation of ternary mixture. Aurangzeb et al 8 developed a new type of extractive dividing wall column (E-DWC) using hot ethylene glycol as solvent to separate ethanol/water/glycol ternary system, and introduced heat pump distillation technology into E-DWC, which is called heat-integrated E-DWC (E-HiDWC).…”

Strain evolution and novel downstream processing with integrated catalysis enable highly efficient coproduction of 1,3‐propanediol and organic acid esters from crude glycerol

“…In fact, the difficulty of separating the methanol‐esters mixture lies in the separation of the MA‐methanol azeotrope, which cannot be separated using the ordinary distillation technique. Instead, special distillation strategies, such as pressure swing distillation which realizes azeotropic separation by changing the azeotropic composition with different operating pressures (Wang et al, 2019), will be further evaluated in our future work. Since the water content in the recycled methanol will be increased to over 4% due to the esterification reaction (data not shown), to ensure high acid conversion and avoid excessive use of energy, the absorption of water from the recycled methanol involving molecular sieves is therefore proposed; 4.…”

Studi Kasus Pengaruh Tekanan Feed Pada Pre-Pressure Swing Distillation Metil Asetat Berbasis Chemcad

“…Hasil simulasi menggunakan sensitivity study pada ChemCAD dengan variasi tekanan feed, didapatkan hasil yang disajikan dalam Tabel 3. Perubahan tekanan yang terjadi membuat titik azeotropik bergeser [9]. Ketika titik azeotropik bergeser maka titik didih dari komponen akan ikut bergeser menjadi lebih besar seiring dengan tekanan yang meningkat.…”