PGMEA Recycling

Reporter: Lin Hong

Components of waste solvent compone

ntW% BP（℃） Solubility

in waterDens

ity （ g/cm3）

CAS

PGMEA 91.15% 145.98 16ml/L 0.966

108-65-6

Ethyl Lactate(乳酸乙酯 )

1.98% 154 immiscible

1.02 97-64-3

Cyclohexanone(环己酮 )

2.75% 155.6 Slightly insoluble

0.948

108-94-1

Anisole(苯甲醚 )

0.83% 155.5 insoluble 0.996

100-66-3

Diethylene Glycol Diethyl Ether(二乙二醇二甲醚 )

1.79% 162 immiscible

0.947

111-96-6

water 1.5% 100 \ 1.000

7732-18-5

Azeotropic systemBP（℃）

PGMEA-water ？

PGMEA-Ethyl Lactate ？

Cyclohexanone-water 95water 100

Diethylene Glycol -water 100

PGMEA 145.98

Ethyl Lactate-Anisole 150

Ethyl Lactate-Cyclohexanone

153.55

Ethyl Lactate 154Anisole 155.5

Cyclohexanone 155.6Diethylene Glycol 162

Water-PGMEA

Component 1

Component 2

P（ KPa）

T(℃) X1az

water PGMEA93.3 63.82 0.88053.3 79.32 0.88826.7 63.38 0.903

*The data above is from literature.

PGMEA- Ethyl LactateCom

ponent 1

Component 2

P（ KPa）

T(℃) X1az

PGMEA

Ethyl Lactate

202.66

171.645

0.86

101.33

145.925

0.90

93.3 143.085

0.92

53.3 124.953

0.92

26.7 104.960

0.92

* The data above is obtained by simulation with UNIFAC model.

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.

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.