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US 11,554,366 B2Granted
Process for recovering and reusing depolymerization catalyst
Assignee9449710 Canada Inc.
InventorsFares Essaddam, Hatem Essaddam, Ramzi Zarrougui
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Abstract
The present disclosure relates to the recovery of an alkoxide catalyst used in a process depolymerizing a polyester to form a diacid or diester and a diol. The present disclosure also relates to the recovery of an alkoxide catalyst used in a process depolymerizing polyethylene terephthalate to form dimethyl terephthalate and mono ethylene glycol.
Claims21
A process comprising:
- (i) contacting an alkoxide containing mother liquor with an adsorbent, thereby adsorbing the alkoxide in the adsorbent;
- and
- (ii) washing the adsorbent with a wash solvent comprising methanol, thereby eliminating at least a portion of ester salts, pigments, or dyes adsorbed in the adsorbent during the contacting the alkoxide containing mother liquor with the adsorbent from the adsorbent.
A process comprising:
- (i) contacting an alkoxide containing mother liquor with an adsorbent, thereby adsorbing the alkoxide in the adsorbent;
- and
- (ii) washing the adsorbent with a desorption solvent comprising methanol to obtain a mixture comprising the alkoxide and the desorption solvent.
A process comprising:
- (i) contacting an alkoxide containing mother liquor with an adsorbent, thereby adsorbing the alkoxide in the adsorbent;
- (ii) washing the adsorbent with a desorption solvent to obtain a mixture comprising the alkoxide and the desorption solvent;
- and
- (iii) washing the adsorbent to regenerate the adsorbent.
1 more element
Dependencies are inferred from the claim text.