WO2024095104 - METHOD OF CONVERTING POLY(ETHYLENE TEREPHTHALATE) TO TEREPHTHALIC ACID
National phase entry:
Publication Number
WO/2024/095104
Publication Date
10.05.2024
International Application No.
PCT/IB2023/060763
International Filing Date
25.10.2023
Title **
[English]
METHOD OF CONVERTING POLY(ETHYLENE TEREPHTHALATE) TO TEREPHTHALIC ACID
[French]
PROCÉDÉ DE CONVERSION DE POLY(ÉTHYLÈNE TÉRÉPHTALATE) EN ACIDE TÉRÉPHTALIQUE
Applicants **
SHPP GLOBAL TECHNOLOGIES B.V.
Inventors
KENCHAIAH, Lohith
NARAYANACHAR, Vinod Konaghatta
DASH, Ranjan Kumar
RAMALINGAM, Hariharan
MEDIRATTA, Gaurav
EVANS, Thomas L
VAN ZYL, Andries Jakobus Petrus
Priority Data
63/421,665
02.11.2022
US
Application details
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International Searching Authority |
EPO
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| Recordal of a Change of the Applicant's Name/Address |
Change of Applicant's Name and Address
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| Type of Assignment |
The Standard Agent's Assignment
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| Applicant's Legal Status |
Legal Entity
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| Entry into National Phase under |
Chapter I
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| Patent Delivery |
Send the Letters Patent by Courier
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 2171 | |
| EPO | Filing, Examination, Granting | 10688 | |
| Japan | Filing, Examination, Granting | 2315 | |
| South Korea | Filing, Examination, Granting | 2366 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
22,280
The term for entry into the National Phase has expired. This quotation is for informational purposes only
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Abstract[English]
A method of converting poly(ethylene terephthalate) to terephthalic acid includes a glycolysis step in which poly(ethylene terephthalate) is reacted with ethylene glycol in the presence of a specific catalyst, a hydrolysis step in which the product of the glycolysis step is reacted with an alkali metal hydroxide to produce an alkali metal salt of terephthalic acid, and an acidification step in which the product of the hydrolysis step is acidified to yield a precipitate containing terephthalic acid. Each step of the method can be conducted at ambient or near-ambient pressure, and the method produces terephthalic acid in high yield and high purity.[French]
L'invention concerne un procédé de conversion de poly(éthylène téréphtalate) en acide téréphtalique qui comprend une étape de glycolyse consistant à faire réagir du poly(éthylène téréphtalate) avec de l'éthylène glycol en présence d'un catalyseur spécifique, une étape d'hydrolyse consistant à faire réagir le produit de l'étape de glycolyse avec un hydroxyde de métal alcalin pour produire un sel de métal alcalin d'acide téréphtalique, et une étape d'acidification consistant à acidifier le produit de l'étape d'hydrolyse pour produire un précipité contenant de l'acide téréphtalique. Chaque étape du procédé peut être mise en œuvre à pression ambiante ou proche ambiante, et le procédé produit de l'acide téréphtalique avec un rendement élevé et une grande pureté.