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1. CO2 cylinder; 2. electronic balance; 3. chiller; 4. CO2 pump; 5. controller; 6. cosolvent reservoir; 7. cosolvent pump; 8. heating bath; 9. circulation pump; 10. extractor; 11. separator 1; 12. separator 2; V-1, valve 1, V-2, valve 2; BPR, back pressure regulator; dotted lines, water line; solid lines, CO2 line.
