Granted Patent B2

US 12,304,888 · App. 17/691,939 · Granted May 20, 2025

Inventors: Theodore C. Arnst (Sugar Land, TX); Karina Eureste (Iowa Colony, TX); Kameswara Vyakaranam (Sugar Land, TX); Jan Van Bauwel (Oelegem, BE); Ashish Dhawan (Aurora, IL)

Assignee: Ecolab USA Inc.

C07C7/20C07C4/04C07C4/22C08J11/12

Abstract

Claims (12)

1. A method of stabilizing a plastic-derived synthetic feedstock composition comprising:

heating plastic in a pyrolysis reactor to produce a plastic-derived synthetic feedstock composition,

distilling the plastic-derived synthetic feedstock composition in a distillation column, and

adding an antioxidant composition to the plastic-derived synthetic feedstock composition, wherein the adding is before any distilling in any distillation column, and

wherein the adding is at an outlet of the pyrolysis reactor, an inlet of a quenching tower, and/or an inlet of the distillation column wherein the synthetic feedstock comprises about 2 wt. % to about 30 wt. % gas (C 1 -C 4 hydrocarbon); (2) about 10 wt. % to about 50 wt. % oil (C 5 -C 15 hydrocarbon); (3) about 10 wt. % to about 40 wt. % waxes (≥C 16 hydrocarbon); and (4) about 1 wt. % to about 5 wt. % char and tar.

2. The method of claim 1 , wherein the synthetic feedstock comprises about 35 wt. % to about 65 wt. % olefins and/or diolefins, about 10 wt. % to about 50 wt. % paraffins and/or iso-paraffins, about 5 wt. % to about 25 wt. % naphthenes, and about 5 wt. % to about 35 wt. % aromatics.

3. The method of claim 1 , wherein the antioxidant comprises an alkylated phenol, an aromatic diamine, or any combination thereof.

4. The method of claim 3 , wherein the alkylated phenol comprises 2-tert-butylphenol, 4-tert-butylphenol 2,4-di-tert-butylphenol, 2,6-di-tert-butylphenol, 2,4,6-tri-tert-butylphenol, or any combination thereof.

5. The method of claim 3 , wherein the aromatic diamine comprises a phenylenediamine.

6. The method of claim 1 , wherein the synthetic feedstock composition further comprises other stabilizers and antioxidants, paraffin inhibitors, asphaltene dispersants, wax dispersants, tar dispersants, neutralizers, surfactants, biocides, preservatives, or any combination thereof.

7. The method of claim 1 , wherein the antioxidant is added to the synthetic feedstock composition from about 1 ppm to 5,000 ppm.

8. The method of claim 1 , wherein the antioxidant composition comprises an alkylated phenol and an aromatic diamine.

Assignments (2)

Continuity (2)

References Cited (400)