Ammonium Carbamate → Terephthalic Acid
Reaction equation
C(=O)([O-])N.[NH4+].[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>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 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 200 °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 film and bottles in the amount of 1000 g were placed together with a solution of 407 g of ammonium carbamate (NH4CONH2) in 10 liters of water. Then a content of the reactor was heated up to 200° C. and the temperature was kept till the digestion of poly/ethylene terephtalate/. The autoclave was relieved and the excess of carbon dioxide and water were removed. The water solution of products formed in the autoclave was filtered hot through a filter with active carbon. The chilled filtrate was acidified with sulphuric acid and the precipite of terephtalic acid was separated from a filtrate in a centrifuge. The resulted product was washed with distilled water, giving 862 g of terephtalic acid. From a solution, resulted after precipitation and separation ethylene glycol in amount of 321 g was separated, using distillation process, and the residue was ammonium sulphate.
Workup
- customIn a heated autoclave, provided with a mixer and
- customthe excess of carbon dioxide and water were removed
- customThe water solution of products formed in the autoclave
- filtrationwas filtered hot through
- filtrationa filter with active carbon
- customthe precipite of terephtalic acid was separated from a filtrate in a centrifuge
- washThe resulted product was washed with distilled water
Sources & evidence
- ORD record
- ord-34ddd5cf08b84ef8aab9a0b47ce33a1a
- Source dataset
- uspto-grants-2001_05
- Patent number
- US06239310B1
Reaction notes
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