Carbon Dioxide → Terephthalic Acid

HRID 1979102Notes

Reaction equation

HRID 1979102 reaction equation
C(=O)(O)[O-].[K+].[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]=1

Participants

5

Reactant 3

HCID 280Carbon DioxideHCID 516893Potassium BicarbonateHCID 150661113,6-Dioxabicyclo[6.2.2]dodeca-8,10,11-triene-2,7-dione

Product 1

HCID 7489Terephthalic Acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent2×

Conditions

Temperature
190 °C

Procedure

In a heated autoclave, provided with a mixer and filled partially with water, disintegrated poly/ethyleneterephtalate/ wastes in a form of scraps of bottles and textiles were placed in the amount of 1000 g together with a solution of 1043 g of potassium bicarbonate (KHCO3) in 10 liters of water, and then a content of the reactor was heated up to 190° 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 was separated, and a resulted solution was filtered hot through a filter with active carbon. The filtrate was neutralised with orthophosphoric 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 864,2 g of terephtalic acid. At the same time ethylene glycol was separated from the neutralised filtrate using distillation, obtaining 322,5 g of ethylene glycol and almost theoretical amount of inorganic salt.

Workup

  1. customIn a heated autoclave, provided with a mixer and
  2. customcarbon dioxide was separated
  3. filtrationa resulted solution was filtered hot through
  4. filtrationa filter with active carbon
  5. customa precipitate of terephtalic acid was separated from a reaction solution
  6. washThe resulted product was washed with a distilled water
  7. customcrystallised from water

Sources & evidence

ORD record
ord-17dd5cd213cf453984272540bed60a69
Source dataset
uspto-grants-2001_05
Patent number
US06239310B1

Reaction notes

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