Methods and compounds for removing non-acidic contaminants from hydrocarbon streams
An extraction solvent comprised of one or more ethyleneamines having structure (I), (II), or (III): where R 1 -R 6 can independently be H, C 1 -C 4 linear or branched alkyl, amido (RRNC═O), or hydroxyalkyl, where each R in the amido group independently H or C 1 alkyl, and where x ranges from 1 to 6, may be contacted with a hydrocarbon stream to remove or extract non-acidic contaminants, such as thiophenes, benzothiophenes, alkyl sulfides, alkyl disulfides, mercaptans, aromatics, oxygenates, metals, olefins, and combinations thereof, from the hydrocarbon stream. The extraction solvent may include co-solvents and the hydrocarbon stream may be in gas and/or liquid form.
1. A treated fluid comprising:
a hydrocarbon stream comprising non-acidic contaminants selected from a group consisting of thiophenes, benzothiophenes, alkyl sulfides, alkyl disulfides, mercaptans, aromatics, oxygenates, metals, olefins, and combinations thereof; and
an extraction solvent comprising one or more ethyleneamines having structure (I), (II), or (III):
where R 1 is H, R 2 -R 6 to the extent chemically possible, independently be H, C 1 -C 4 linear or branched alkyl, amido (RRNC═O), or hydroxyalkyl, where each R in the amido group is independently H or C 1 alkyl, and where x ranges from 1 to 6.
2. The treated fluid of claim 1 , where the extraction solvent further comprises a co-solvent selected from a group consisting of water, an alcohol, a glycol, an amide, an ester, an amine different from the one or more ethyleneamines, a quaternary ammonium compound, and combinations thereof.
3. The treated fluid of claim 2 , where the ratio of the one or more ethyleneamines to the co-solvent ranges from about 100:0.00001 to about 25:75.
4. The treated fluid of claim 1 , where the ratio of the one or more ethyleneamines to hydrocarbon in the hydrocarbon stream ranges from about 1:10 to about 95:100.
5. The treated fluid of claim 1 , where the hydrocarbon stream is selected from a group consisting of refinery feedstock, light petroleum gases, straight run distillates, cracked stocks, hydrotreated materials, finished fuel blends, and combinations thereof.
6. A treated fluid comprising:
a hydrocarbon stream comprising non-acidic contaminants selected from a group consisting of thiophenes, benzothiophenes, alkyl sulfides, alkyl disulfides, mercaptans, aromatics, oxygenates, metals, olefins, and combinations thereof, where the hydrocarbon stream is selected from a group consisting of refinery feedstock, light petroleum gases, straight run distillates, cracked stocks, hydrotreated materials, finished fuel blends, and combinations thereof; and
an extraction solvent comprising one or more ethyleneamines having structure (I), (II), or (III):
where R 1 is H, R 2 -R 6 to the extent chemically possible, independently be H, C 1 -C 4 linear or branched alkyl, amido (RRNC═O), or hydroxyalkyl, where each R in the amido group is independently H or C 1 alkyl, and where x ranges from 1 to 6;
where the ratio of the one or more ethyleneamines to hydrocarbon in the hydrocarbon stream ranges from about 1:10 to about 95:100.
7. The treated fluid of claim 6 , where the extraction solvent further comprises a co-solvent selected from a group consisting of water, an alcohol, a glycol, an amide, an ester, an amine different from the one or more ethyleneamines, a quaternary ammonium compound, and combinations thereof.
8. The treated fluid of claim 7 , where the ratio of the one or more ethyleneamines to the co-solvent ranges from about 100:0.00001 to about 25:75.