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US 4,045,506 AGranted
Separation of hydrocarbon mixtures by catalytic dealkylation
AssigneeChevron Research Company
InventorsMilutin Simic, William A. Sweeney
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Abstract
A process for separating mixtures of close boiling alkenes and alkanes which employs catalytic dealkylation of alkylphenols.
Claims5
A process for separating a close-boiling mixture comprising substantially linear olefins and paraffins which comprises the steps of:
- 1. contacting a paraffin-dilute substantially linear olefin mixture with a phenolic compound in the presence of an aluminum or magnesium phenoxide alkylation catalyst under conditions effective to cause olefin alkylation between the olefin and the phenol to prepare alkylphenols;
- 2. recovering the alkylphenols;
- 3. heating the alkylphenols in the presence of a silica-based dealkylation catalyst at a temperature below about 300.degree. C under conditions effective to regenerate the olefin at conversions of from about 70-80% by weight;
- and
- 4. rapidly separating the parafffin-free olefin.
2 more elements
A continuous process for separating a close-boiling mixture comprising substantially linear olefins and paraffins which comprises the steps of:
- 1. contacting a paraffin-diluted substantially linear olefin with a phenolic compound in the presence of an aluminum or magnesium phenoxide alkylation catalyst in a first reaction zone under conditions effective to cause alkylation of phenol to prepare a reaction product comprising paraffin and alkylphenols;
- 2. recovering the alkylphenols;
- 3. heating the alkylphenols in the presence of a silica-based dealkylation catalyst in a second reaction zone at a temperature below about 300.degree. C under conditions effective to cause dealkylation of the alkylphenol to prepare a reaction product comprising olefin, and phenol at a conversion of from about 70-80% by weight;
- 4. recovering paraffin-free substantially linear olefin;
- 5. recycling phenol from step (3) to the first reaction zone of step (1).
2 more elements
Dependencies are inferred from the claim text.