Preparation of isopropylnaphthalene mixture
AssigneeSun Oil Company of Pennsylvania
InventorMarcus W. Haseltine, Jr.
Life of this patent
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Abstract
A process for the preparation of a mixture of alkylnaphthalenes useful as a dye solvent for carbonless copy paper by: 1. alkylating naphthalene in the presence of an alkylation catalyst, 2. adding an additional amount of catalyst after the alkylation has been completed, and 3. holding the reaction mass at 180.degree. to 280.degree. F. for a time sufficient to maximize yield of dialkylated product.
Claims13
In the process of alkylating naphthalene with an alkylating agent in the presence of an alkylation catalyst to obtain a mixture of alkylated naphthalenes, the improvement of increasing the yield of dialkylnaphthalene which comprises adding additional catalyst after the alkylation is completed and then holding the reaction mass at a temperature of from about 180.degree. to about 280.degree. F. for a time sufficient to maximize yield of dialkylated product.
A process for the preparation of a mixture of alkylnaphthalenes useful as dye solvent for carbonless copy paper which comprises the steps of
- a. adding an olefin alkylating agent containing from 2 to 10 carbon atoms to naphthalene at a temperature of from about 180.degree. to about 280.degree. F. and in the presence of from about 0.5% to about 2% by weight of naphthalene of a Friedel-Crafts catalyst,
- b. adding an additional 0.2% to 1.0% of catalyst after the alkylating agent has been added, and
- c. holding the reaction mass at 180.degree. to 280.degree. F for about 15 to about 60 minutes to maximize yield of dialkynaphthalene.
A process for the preparation of a mixture of isopropylnaphthalenes useful as a dye solvent for carbonless copy paper said mixture comprising by weight from about 25% to about 35% of monoisopropylnaphthalene, no less than about 55% up to about 60% of diisopropylnaphthalene, and about 10% of triisopropylnaphthalene which comprises the steps of
- a. adding propylene to naphthalene at a temperature of from about 180.degree. to about 280.degree. F. and in the presence of from about 0.5% to about 2% by weight of naphthalene of AlCl.sub.3 as alkylation catalyst, the mole ratio of propylene to naphthalene being from about 1.3 to about 2.3,
- b. adding an additional 0.2% to 1.0% of AlCl.sub.3 after the propylene has been added, and
- c. holding the reaction mass at 180.degree. to 280.degree. F. for about 15 to about 60 minutes to maximize yield of solvent.
Dependencies are inferred from the claim text.