1. PGMEA Recycling
Reporter: Lin Hong

2. Components of waste solvent
BP（℃）
Solubility in water
Density（g/cm3）
CAS
PGMEA
91.15%
145.98
16ml/L
0.966
Ethyl Lactate(乳酸乙酯)
1.98%
154
immiscible
1.02
Cyclohexanone(环己酮)
2.75%
155.6
Slightly insoluble
0.948
Anisole(苯甲醚)
0.83%
155.5
insoluble
0.996
Diethylene Glycol Diethyl Ether(二乙二醇二甲醚)
1.79%
162
0.947
water
1.5%
100 \
1.000

3. Azeotropic system BP（℃） PGMEA-water ？ PGMEA-Ethyl Lactate
Cyclohexanone-water 95
water
100
Diethylene Glycol -water
PGMEA
145.98
Ethyl Lactate-Anisole
150
Ethyl Lactate
-Cyclohexanone
153.55
154
Anisole
155.5
Cyclohexanone
155.6
Diethylene Glycol
162

4. Water-PGMEA Component 1 Component 2 P（KPa） T(℃) X1az water PGMEA 93.3
63.82
0.880
53.3
79.32
0.888
26.7
63.38
0.903
*The data above is from literature.

5. PGMEA- Ethyl Lactate Component 1 Component 2 P（KPa） T(℃) X1az PGMEA
202.66
0.86
101.33
0.90
93.3
0.92
53.3
26.7
* The data above is obtained by simulation with UNIFAC model.

6. Separation Process Product purity：PGMEA>99.5%
1.Add enough water, then remove Cyclohexanone and Diethylene Glycol by azetropic distillation;
*It can be figured that step 1 has no effect on Diethylene Glycol by simulation.

7. Separation Process
2.Add enough m-xylene(BP139℃), then remove Ethyl Lactate by azetropic distillation(BP137℃).
Or 2.accumulate PGMEA at top
*The steps above have not been confirmed by simulation or experiment.