H2SO4 alkylation by conversion of olefin feed to oligomers and sulfate esters
AssigneeCatalytic Distillation Technologies
InventorsLawrence A. Smith, Jr., Abraham P. Gelbein, William M. Cross, Jr.
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Abstract
A process for treating an alkylation feedstock comprising olefins, n-alkanes, and iso-alkanes, the process including: contacting at least a portion of the alkylation feedstock with sulfuric acid in a reaction zone under conditions to form sulfate esters of the olefins; separating the n-alkanes and the iso-alkanes from the sulfuric acid and the sulfate esters; recovering the n-alkanes and the iso-alkanes in a first product stream; and recovering the sulfate esters in a second product stream; wherein the sulfuric acid has a strength titrating as below 75 weight percent H2SO4/water mixtures.
Claims23
A process for treating an alkylation feedstock comprising olefins, n-alkanes, and iso-alkanes, the process comprising:
- contacting at least a portion of the alkylation feedstock with sulfuric acid in a reaction zone under conditions to form sulfate esters of the olefins;
- separating the n-alkanes and the iso-alkanes from the sulfuric acid and the sulfate esters;
- recovering the n-alkanes and the iso-alkanes in a first product stream;
- and
- recovering the sulfate esters in a second product stream;
- wherein the sulfuric acid has a strength that titrates as below 75 weight percent H2SO4/water mixtures.
A process for treating a C4-rich alkylation feedstock comprising n-butenes, n-butanes, and iso-butanes, the process comprising:
- contacting at least a portion of the alkylation feedstock with sulfuric acid in a reaction zone under conditions to form sulfate esters of the n-butenes;
- separating the n-butanes and the iso-butanes from the sulfuric acid and the sulfate esters;
- recovering the n-butanes and the iso-butanes;
- and
- recovering the sulfate esters;
- wherein the sulfuric acid has a strength that titrates as below 75 weight percent H2SO4/water mixture.
A process for treating an alkylation feedstock comprising isoolefins, n-olefins, isoalkanes, and n-alkanes, the process comprising:
- feeding the alkylation feedstock to an oligomerization reaction zone under conditions of temperature and pressure to oligomerize at least a portion of the isoolefin;
- separating the oligomers from the unreacted isoolefin, olefins, n-alkanes, and iso-alkanes by fractionation;
- recovering at least a portion of the unreacted isoolefin, olefins, n-alkanes, and iso-alkanes;
- and
- recovering the oligomers
- contacting at least a portion of the recovered unreacted isoolefin, olefins, n-alkanes, and iso-alkanes with sulfuric acid in a reaction zone under conditions to form sulfate esters of the olefins;
- separating the n-alkanes and the iso-alkanes from the sulfuric acid and the sulfate esters;
- recovering the n-alkanes and the iso-alkanes;
- and
- recovering the sulfate esters;
- wherein the sulfuric acid has a strength that titrates as below 75 weight percent H2SO4/water mixtures.
Dependencies are inferred from the claim text.