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US 3,950,448 AGranted
Detergent-grade alkylate production
AssigneeUniversal Oil Products Company
InventorPaul A. Witt
Life of this patent
Estimating the term…
Abstract
Detergent-grade alkylate is produced by the HF-acid catalyzed reaction of aromatic hydrocarbons and an olefinic hydrocarbon. The process utilizes a unique fractionation facility for the recovery and use of an aromatic concentrate, and ultimate recovery of the detergent alkylate product. Integrated within the process is a combination stripping/fractionation column having a contact-condenser disposed therein.
Claims10
A method for recovering HF and benzene from a mixture thereof with alkylbenzenes, the alkyl group of which contains from ten to about fifteen carbon atoms per molecule, polyalkyl benzenes and/or polyphenyl alkanes, which method comprises the steps of:
- a. introducing said mixture into a combination stripping/fractionating column, at an intermediate first locus thereof;
- b. withdrawing a bottoms fraction from said column, at a lower second locus thereof, containing alkylbenzenes, polyalkyl benzenes and/or polyphenyl alkanes, substantially free from HF and benzene;
- c. withdrawing a side-cut fraction from said column, substantially free from HF, at an intermediate third locus thereof, said third locus being above said first locus and below a contact-condenser disposed in an upper section of said column;
- d. introducing a first portion of said side-cut fraction, at substantially the same temperature, into said column, at a fourth locus intermediate said first locus and said third locus;
- e. cooling a second portion of said side-cut fraction and introducing said second portion into said column at a fifth locus above said contact-condenser;
- and,
- f. withdrawing HF and benzene as an overhead fraction from said column, a sixth locus above said fifth locus.
4 more elements
A process for the production of an alkylaromatic hydrocarbon which comprises the steps of:
- a. reacting aromatic hydrocarbons with an olefinic hydrocarbon in contact with a hydrogen fluoride catalyst, in a reaction zone at alkylation conditions selected to produce alkylated aromatics;
- b. separating the resulting reaction zone effluent, in a separation zone, to provide a hydrocarbon-rich stream, containing hydrogen fluoride, and a hydrogen fluoride-rich stream;
- c. introducing at least a portion of said hydrogen fluoride-rich stream into a regeneration zone to produce regenerated hydrogen fluoride and recycling regenerated hydrogen fluoride to said reaction zone;
- d. introducing said hydrocarbon-rich stream, containing aromatic hydrocarbons, HF, alkylaromatics, polyalkyl aromatics and/or polyaryl alkanes, into a combination stripping/fractionation zone having a contact-condenser disposed therein, and recovering therefrom (i) an overhead fraction rich in aromatic hydrocarbons and HF, (ii) a bottoms fraction containing alkylaromatics, polyalkyl aromatics and/or polyaryl alkanes and (iii) a side-cut fraction containing aromatic hydrocarbons and substantially free from HF;
- e. introducing a first portion of said side-cut fraction, at substantially the same temperature, into said column;
- f. introducing a second portion of said side-cut fraction into said regeneration zone and countercurrently contacting therein said hydrogen fluoride-rich stream;
- and,
- g. recovering said linear alkylaromatics from said bottoms fraction.
5 more elements
A process for producing detergent-grade alkylate which comprises the steps of:
- a. reacting aromatic hydrocarbons with an olefinic hydrocarbon in contact with an HF catalyst, in a first reaction zone, at alkylation conditions selected to produce alkylated aromatics;
- b. introducing the resulting first reaction zone effluent into a first separation zone to provide a first hydrocarbon phase and a first HF-acid phase;
- c. further reacting said first hydrocarbon phase in contact with HF-acid catalyst, in a second reaction zone, at alkylation conditions selected to produce additional alkylated aromatics;
- d. recycling a first portion of said first HF-acid phase to said first reaction zone, and introducing a second portion into an upper section of a regeneration zone and countercurrently contacting said second portion therein with an aromatic hydrocarbon-containing stream to provide a regenerated HF-acid phase;
- e. recycling at least a portion of said regenerated HF-acid phase to said second reaction zone;
- f. introducing the resulting second reaction zone effluent into a second separation zone to provide a second HF-acid phase and a second hydrocarbon phase;
- g. recycling at least a portion of said second HF-acid phase to said first reaction zone;
- h. introducing said second hydrocarbon phase, containing HF, aromatic hydrocarbons, alkylated aromatics, polyalkyl aromatics and/or polyaryl alkanes into a combination stripping/fractionation zone having a contact-condenser disposed therein, and withdrawing therefrom a side-cut fraction principally containing aromatic hydrocarbons;
- i. introducing at least a portion of said sidecut fraction into a lower section of said regeneration zone to countercurrently contact therein the second portion of said HF-acid phase as said aromatic hydrocarbon-containing stream;
- and,
- j. recovering said detergent-grade alkylate from the remainder of said second hydrocarbon phase.
8 more elements
Dependencies are inferred from the claim text.