Method for the preparation of ethers

Claim 1

A method for the preparation of aliphatic ethers comprising dehydrating an aliphatic alcohol at a temperature between 200° and 400° C. in the presence of a catalyst produced by the steps of: (a) reacting active alumina with a silicon compound of general formula ##STR2## wherein X, Y, Z, and W are each selected from the group consisting of --R, --OR, --Cl, --Br, --SiH 3 , --COOR and --SiH n Cl m , R is a hydrogen atom of an alkyl, cycloalkyl, aryl, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms and m and n are integers of from 1 to 3; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b) thereby depositing on said alumina from 0.5% to 20% by weight, calculated on the final overall weight of said catalyst, of silica formed by the above reaction.

Claim 2

A method for the preparation of aliphatic ethers comprising dehydrating an aliphatic alcohol at a temperature between 200° and 400° C. in the presence of a catalyst produced by the steps of: (a) reacting active alumina with a silicon compound of general formula ##STR2## wherein X, Y, Z, and W are each selected from the group consisting of --R, --OR, --Cl, --Br, --SiH 3 , --COOR and --SiH n Cl m , R is a hydrogen atom of an alkyl, cycloalkyl, aryl, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms and m and n are integers of from 1 to 3; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b) thereby depositing on said alumina from 0.5% to 20% by weight, calculated on the final overall weight of said catalyst, of silica formed by the above reaction.

Claim 3

A method for the preparation of aliphatic ethers comprising dehydrating an aliphatic alcohol having from 1 to 6 carbon atoms at a temperature between 200° and 400° C. in the presence of a catalyst produced by the steps of: (a) reacting active alumina with a silicon compound of general formula ##STR3## wherein X, Y, Z, and W are each selected from the group consisting of --R, --OR, --Cl, --Br, --SiH 3 , --COOR and --SiH n Cl m , R is a hydrogen atom or an alkyl, cycloalkyl, aryl, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms and m and n are integers of from 1 to 3; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b) thereby depositing on said alumina from 0.5% to 20% by weight, calculated on the final overall weight of said catalyst, of silica formed by the above reaction.

Claim 4

A method for the preparation of aliphatic ethers comprising dehydrating an aliphatic alcohol having from 1 to 6 carbon atoms at a temperature between 200° and 400° C. in the presence of a catalyst produced by the steps of: (a) reacting active alumina with a silicon compound of general formula ##STR3## wherein X, Y, Z, and W are each selected from the group consisting of --R, --OR, --Cl, --Br, --SiH 3 , --COOR and --SiH n Cl m , R is a hydrogen atom or an alkyl, cycloalkyl, aryl, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms and m and n are integers of from 1 to 3; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b) thereby depositing on said alumina from 0.5% to 20% by weight, calculated on the final overall weight of said catalyst, of silica formed by the above reaction.

Claim 5

A method for the preparation of aliphatic ethers comprising reacting an alcohol selected from methanol, ethanol, isopropanol at a temperature between 200° and 400° C. in the presence of a catalyst produced by the steps of: (a) reacting active alumina with a silicon compound of general formula ##STR4## wherein X, Y, Z, and W are each selected from the group consisting of --R, --OR, --Cl, --Br, --SiH 3 , --COOR and --SiH n Cl m , R is a hydrogen atom or an alkyl, cycloalkyl, aryl, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms and m and n are integers of from 1 to 3; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b) thereby depositing on said alumina from 0.5% to 20% by weight, calculated on the final overall weight of said catalyst, of silica formed by the above reaction.

Claim 6

A method for the preparation of aliphatic ethers comprising reacting an alcohol selected from methanol, ethanol, isopropanol at a temperature between 200° and 400° C. in the presence of a catalyst produced by the steps of: (a) reacting active alumina with a silicon compound of general formula ##STR4## wherein X, Y, Z, and W are each selected from the group consisting of --R, --OR, --Cl, --Br, --SiH 3 , --COOR and --SiH n Cl m , R is a hydrogen atom or an alkyl, cycloalkyl, aryl, alkyl-aromatic or alkyl-cycloalkyl radical having from 1 to 30 carbon atoms and m and n are integers of from 1 to 3; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b) thereby depositing on said alumina from 0.5% to 20% by weight, calculated on the final overall weight of said catalyst, of silica formed by the above reaction.

Claim 13

A method for the preparation of aliphatic ethers comprising dehydrating aliphatic alcohols selected from methanol, ethanol and isopropanol, at a temperature between 200° and 400° C. in the presence of a catalyst comprised of active alumina having a layer of silica deposited thereon, the silica comprising from 0.5 to 20 percent by weight of the total catalyst.

Claim 14

A method for the preparation of aliphatic ethers comprising dehydrating aliphatic alcohols selected from methanol, ethanol and isopropanol, at a temperature between 200° and 400° C. in the presence of a catalyst comprised of active alumina having a layer of silica deposited thereon, the silica comprising from 0.5 to 20 percent by weight of the total catalyst.

Claim 20

A method for the preparation of aliphatic ethers comprising dehydrating aliphatic alcohols selected from methanol, ethanol and isopropanol, at a temperature between 200° and 400° C. in the presence of a catalyst comprised of active alumina having a layer of silica deposited thereon, said layer comprising from 0.5 to 20 percent by weight of the total catalyst and said catalyst being produced by the steps of: (a) reacting active alumina with a compound selected from the tetrasilicates of methyl, ethyl, propyl, isopropyl, isobutyl and n-butyl; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b).

Claim 21

A method for the preparation of aliphatic ethers comprising dehydrating aliphatic alcohols selected from methanol, ethanol and isopropanol, at a temperature between 200° and 400° C. in the presence of a catalyst comprised of active alumina having a layer of silica deposited thereon, said layer comprising from 0.5 to 20 percent by weight of the total catalyst and said catalyst being produced by the steps of: (a) reacting active alumina with a compound selected from the tetrasilicates of methyl, ethyl, propyl, isopropyl, isobutyl and n-butyl; (b) drying the product of step (a); and (c) calcining in air the dried product of step (b).