Recovery process for ethylene glycol and dimethylterephthalate

{
  "publication_number": "US5051528A",
  "country": "US",
  "kind": "A",
  "title": "Recovery process for ethylene glycol and dimethylterephthalate",
  "abstract": "A method of recovering ethylene glycol and dimethyl terephthalate from scrap polyethylene terephthalate resins by dissolving the scrap in oligomers of the same monomers and passing methanol through the solution.",
  "claims": [
    "1. A method of recovering ethylene glycol and dimethylterephthalate from polyethyleneterephthalate polyesters which comprises dissolving scrap polyester in oligomers of ethylene glycol and terephthalic acid or dimethyl terephthalate, passing super-heated methanol through the solution and recovering the ethylene glycol and dimethylterephthalate.",
    "2. The method of claim 1 wherein the process is conducted under atmospheric pressure.",
    "3. The process of claim 1 wherein the scrap is heated to a temperature of from about 20° to 270° C. during the contact with methanol.",
    "4. The method of claim 1 wherein an excess quantity of methanol is passed through the solution.",
    "5. The method of claim 1 wherein the ethylene glycol and dimethylterephthalate are recovered by distillation."
  ],
  "cpc": [
    "C07C 67/03"
  ],
  "assignees": [
    "EASTMAN KODAK CO"
  ],
  "filing_date": "1990-04-24",
  "publication_date": "1991-09-24",
  "grant_date": "1991-09-24",
  "priority_date": "1990-04-24",
  "application_number": "US-52107090-A",
  "family_id": "24075211",
  "citations": [
    "US3037050A",
    "US3321510A",
    "US3488298A",
    "US3701741A",
    "US3776945A",
    "US4163860A",
    "US4578502A"
  ]
}