Process for the chemical modification of surfaces of inorganic solids
AssigneeIstvan Helsaz
InventorsImrich Sebestian, Istvan Halasz
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Abstract
A process for the chemical modification of the surfaces of inorganic solid bodies containing --OH groups, which comprises silanizing the free --OH groups with an alkylhalosilane to covalently bond the alkyl groups thereof to the oxygen atoms of the hydroxyl groups; halogenating or sulfochlorinating the resultant bound alkyl groups to form corresponding haloalkyl or sulfochloroalkyl groups; and replacing the halogen atoms of the resultant haloalkyl or sulfochloroalkyl groups by substitution with a functional group to form a chemically modified, inorganic solid body suitable for use as a stationary phase component in catalysis or chromatography.
Claims20
A process for chemically modifying the free OH-containing surface of an inorganic solid body suitable for use as a stationary phase component in catalysis or chromatography, which comprises:
- a. silanizing said free OH groups with an alkylhalosilane of 1-18 carbon atoms to covalently bond the alkyl groups of said alkylhalosilane to the oxygen atoms of said hydroxyl groups by forming --O--Si-alkyl linkages;
- b. halogenating or sulfochlorinating only said bound alkyl groups to form corresponding haloalkyl or sulfochloroalkyl groups;
- and
- c. replacing halogen atoms of the resultant haloalkyl or sulfochloroalkyl groups by substitution with a functional group selected from the class consisting of --SO.sub.3 H, --NH.sub.2, --SH, --OH, --CN, --NO.sub.2, --NHR --NR.sub.2, --NR.sub.3 .sup.+, --COOH and cresyl wherein R is lower alkyl to form said chemically modified inorganic solid body.
In a modified inorganic solid body suitable for use as a stationary phase component in catalysis or chromatography and containing free hydroxyl groups on the surface thereof which have been silanized with an alkylhalosilane of 1-18 carbon atoms to covalently bond the alkyl groups of said alkylhalosilane to the oxygen atoms of said hydroxyl groups by forming --O--Si-alkyl linkages, the improvement wherein:
- said bonded alkyl group is functionally substituted to form a member selected from the class consisting of alcohols, esters, amines, sulphonium salts, phosphonium salts, thiols and thioethers.
In a modified inorganic solid body suitable for use as the stationary phase in catalysis or chromatography and containing free hydroxyl groups on the surface thereof which have been silanized to introduce a haloalkyl group, the improvement wherein:
- said haloalkyl groups after silanization have been functionally substituted by replacing a halogen atom with a functional group selected from the class consisting of --SO.sub.3 H, --NH.sub.2, --SH, --OH, --CN, --NO.sub.2, --NHR.sub.1, --NR.sub.2, --NR.sub.3.sup.+, COOH and cresyl wherein R is lower alkyl.
In a modified inorganic solid body suitable for use as a stationary phase component in catalysis or chromatography and containing free hydroxyl groups on the surface thereof which have been silanized with an alkylhalosilane of 1-18 carbon atoms to covalently bond the alkyl groups of said alkylhalosilane to the oxygen atoms of said hydroxyl groups by forming --O--Si-alkyl linkages, the improvement wherein:
- said free hydroxyl groups are substantially completely reacted by post-silanization such that the modified surfaces exhibit no methyl red absorption, whereby said surface is insensitive to hydrolysis.
Dependencies are inferred from the claim text.