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1. WO2004094564 - TRANSALKYLATION DE FLUIDES AROMATIQUES

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[ EN ]

CLAIMS:
What is claimed is:

1. A process for making an ethylated polycyclic aromatic compound in a
mixed aromatic fluid, the process comprising:

contacting the mixed aromatic fluid comprising a polycyclic aromatic
compound and a monocyclic aromatic compound having an ethyl
substituent in the presence of an acid catalyst under conditions sufficient to effect transalkylation to form the ethylated polycyclic compound and a de- ethylated monocyclic aromatic compound, and

removal of at least a portion of the de-ethylated monocyclic aromatic
compound.

2. A process for decreasing naphthalene concentration in a naphthalene- containing aromatic fluid, the process comprising

mixing the naphthalene-containing aromatic fluid with an ethylbenzene- containing fluid to form a mixed aromatic fluid;

contacting the mixed aromatic fluid with an acid catalyst under conditions sufficient to form a naphthalene-depleted aromatic fluid comprising
ethylnaphthalene and benzene; and

separating at least a portion of the benzene from the naphthalene-depleted fluid.

3. A process for selectively transalkylating naphthalene in a mixture of
aromatic compounds, the process comprising: contacting the mixture of aromatic compounds comprising naphthalene and mononuclear alkylated aromatic compound with an acid catalyst under
conditions sufficient to effect transalkylation of the naphthalene to form
ethylnaphthalene and benzene,

wherein the mononuclear alkylated aromatic compound comprise
ethylbenzene and methylated benzene compounds, and

wherein the ratio of ethylbenzene to methylated benzene compounds
decreases during transalkylation.

4. A process for reduction of naphthalene concentration in a mixed aromatic
fluid, the process comprising:

mixing a C-8 aromatic fluid comprising ethylbenzene with a naphthalene- containing aromatic fluid to from a mixed aromatic fluid;

contacting the mixed aromatic fluid with an acid catalyst under conditions sufficient to effect transalkylation to from benzene and a naphthalene- depleted mixed aromatic fluid ; and

separating at least a portion of the benzene from the naphthalene-depleted
aromatic fluid.

5. A process for reducing naphthalene concentration in a mixed aromatic fluid, the process comprising:

contacting an acid catalyst and the mixed aromatic fluid under conditions
sufficient to form ethylnaphthalene,
wherein the mixed aromatic fluid comprises 1,2,4-trimethylbenzene; 1,2,3- trimethlybenzene; m-cymene; a mixture of alkylbenzene compounds having from 1 to 4 alkyl substituents, each alkyl substituent having from 1 to 4 carbon atoms and the total carbon atoms in the alkylbenzene compounds is 10, 11 or 12; naphthalene; and methylnaphthalene.

6. A process of recovering benzene from a C-8 aromatic fluid, the process
comprising mixing a C-8 aromatic compound fluid with a naphthalene- containing aromatic compound containing in the presence of an acidic
catalyst under conditions sufficient to effect transalkylation to form a
benzene containing, naphthalene depleted aromatic fluid and separating at least a portion of the benzene from the benzene containing, naphthalene
depleted aromatic fluid.

7. The process of Claim 1, wherein the polycyclic compound is naphthalene.

8. The process of Claim 1, wherein the monocyclic aromatic compound is
ethylbenzene.

9. The process of any of Claims 1, 2, 3 and 4, wherein the acid catalyst is a
zeolite.

10. The process of Claim 9, wherein the zeolite is at least one of H+Beta,
MCM-22, MCM-49, and USY.

11. The process of Claim 1 , wherein from about 20wt% to about 90 wt% of the polycyclic compound is transalkylated to form the ethylated polycyclic
compound.

12. The process of any of Claims 1 and 2, wherein the process is conducted at a temperature of from about 275 C to about 290 C.

13. The process of Claim 2, wherein from about 20wt% to about 90 wt% of the naphthalene is converted to the ethylnaphthalene.

14. The process of Claim 2, wherein a ratio of the naphthalene concentration in the naphthalene-containing aromatic fluid to the naphthalene concentration in the naphthalene-depleted aromatic fluid ranges from about 80 to about 200.

15. The process of Claim 2, wherein the naphthalene concentration of the
naphthalene-depleted aromatic fluid is less than about 1000 ppm of the
naphthalene-depleted aromatic fluid.

16. The process of any of Claims 3 and 4, wherein from about 20wt% to about 90 wt% of the naphthalene is converted to the ethylnaphthalene.

17. The process of Claim 3, wherein the mixture of aromatic compounds has a final naphthalene concentration of less than about 1000 ppm.

18. The process of Claim 3, wherein a ratio of the naphthalene concentration in the mixture of aromatic compounds to the naphthalene concentration after transalkylation of the mixture of aromatic compounds ranges from about 80 to about 200.

19. The process of Claim 9, wherein the naphthalene-depleted aromatic fluid
has a final naphthalene concentration of less than about 1000 ppm.

20. The process of Claim 9, wherein a ratio of the naphthalene concentration in the mixed aromatic fluid to the naphthalene concentration in the
naphthalene-depleted aromatic fluid ranges from about 80 to about 200.

21. The process of Claim 6, wherein the C-8 aromatic stream comprises xylene and ethylbenzene.

22. The process of Claim 6, wherein the ratio of the naphthalene to
alkylsubstituted benzene ranges from about 0.02 to about 1.