Carbon Dioxide → Terephthalic Acid
Reaction equation
C(=O)(O)[O-].[Na+].[C:6]1(=[O:19])[O:16]CC[O:13][C:11](=[O:12])[C:10]2[CH:17]=[CH:18][C:7]1=[CH:8][CH:9]=2.C(=O)=O>O>[C:6]([OH:19])(=[O:16])[C:7]1[CH:18]=[CH:17][C:10]([C:11]([OH:13])=[O:12])=[CH:9][CH:8]=1Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 200 °C
Procedure
In a heated autoclave, provided with a mixer and filled partially with water, cut poly/ethyleneterephtalate/ wastes in a form of scraps of foil and pieces of industrial shapes were placed in the amount of 1000 g together with a solution of 875 g of sodium bicarbonate (NaHCO3) in 10 liters of water, and then a content of the reactor was heated up to 200° C. and the temperature was kept till the digestion of poly/ethylene terephtalate/ was completed and the formation of carbon dioxide was stopped. Then the autoclave was relieved and carbon dioxide and water excess were separated, then a resulted solution was filtered hot through a filter with active carbon. The filtrate was neutralised with hydrochloric acid and a precipitate of terephtalic acid was separated from a reaction solution using a centrifuge. The resulted product was washed with a distilled water and crystallised from water, giving 864 g of terephtalic acid. At the same time ethylene glycol was separated from the neutralised filtrate using extraction with diethylcarbonate, obtaining 322,6 g of ethylene glycol.
Workup
- customIn a heated autoclave, provided with a mixer and
- customcarbon dioxide and water excess were separated
- filtrationa resulted solution was filtered hot through
- filtrationa filter with active carbon
- customa precipitate of terephtalic acid was separated from a reaction solution
- washThe resulted product was washed with a distilled water
- customcrystallised from water
Sources & evidence
- ORD record
- ord-08165c85cbfe4362af6acdaadf2df849
- Source dataset
- uspto-grants-2001_05
- Patent number
- US06239310B1
Reaction notes
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