초록 ▼

In the production of alkylaromatics by the alkylation of aromatic hydrocarbons with alkylating agents such as olefins typically in the presence of a catalyst, the unconverted aromatic hydrocarbon remaining after completion of the alkylation process is separated from the alkylaromatic product and the

In the production of alkylaromatics by the alkylation of aromatic hydrocarbons with alkylating agents such as olefins typically in the presence of a catalyst, the unconverted aromatic hydrocarbon remaining after completion of the alkylation process is separated from the alkylaromatic product and the terminal alkylaromatic isomers are separated from the mixture of alkylaromatic isomers produced in the alkylation process by the selective permeation of the aromatic hydrocarbon and the terminal isomers through a permselective membrane, preferably an asymmetric membrane producing a permeate rich in the terminal isomers and a retentate which is lean (i.e., depleated) in the terminal isomers. Permeation is under reverse osmosis conditions, that is, under a pressure sufficient to at least overcome the osmotic pressure of the aromatic hydrocarbon present in the mixture made up of the aromatic hydrocarbon, the olefin and the mixed isomer alkylaromatic product. Permeation is carried out at a pressure of about 100 to 800 psig, preferably a pressure of about 200 to 600 psig, more preferably a pressure of about 300 to 500 psig, at a temperature of about 0°to 100°C., preferably about 20°-80°C., most preferably about 20°to 50°C. The membrane of choice is an asymmetric polyimide membrane.

대표청구항 ▼

A method for separating alkylaromatic from a stream comprising a mixture of said alkylaromatics, unconverted aromatic and alkylating agent starting material and coproduced by-product by contacting said mixed stream with a perm-selective asymmetric membrane under reverse osmosis conditions, whereby t

A method for separating alkylaromatic from a stream comprising a mixture of said alkylaromatics, unconverted aromatic and alkylating agent starting material and coproduced by-product by contacting said mixed stream with a perm-selective asymmetric membrane under reverse osmosis conditions, whereby the unconverted aromatic and alkylating agent starting materials permeate through the asymmetric membrane yielding a permeate stream rich in such unconverted starting material and containing a quantity of co-permeated alkylaromatic material and a retentate steam rich in alkylaromatic product and by-product and lean in the aromatic and alkylating agent starting material.