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US 6,639,110 B2Granted
Method for making dimethyl disulphide compositions having a masked smell
AssigneeElf Atochem S.A.
InventorGeorges Fremy
Life of this patent
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Abstract
A composition based on dimethyl disulphide (DMDS) with a masked smell according to the invention comprises, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan, less than 100 ppm of dimethyl sulphide and up to 1% of at least one odor-masking agent.
Claims9
A method of making a dimethyl disulphide composition having a masked smell, comprising:
- producing dimethyl disulphide (DMDS) having odorous volatile impurities of methyl mercaptan (MM) and dimethyl sulphide (DMS);
- reducing the volatile impurities to provide, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan (MM), and less than 100 ppm of dimethyl sulphide (DMS);
- and
- adding from 0.1 to 0.5% of at least one odor-masking agent, wherein the at least one odor-masking agent is selected from the esters of the formula:
- R1CO2R2 (I)
- in which R1 represents an optionally unsaturated, linear or branched hydrocarbon radical containing from 1 to 4 carbon atoms and R2 represents an optionally unsaturated, linear, branched or cyclic hydrocarbon radical containing from 2 to 8 carbon atoms.
3 more elements
A method of making a dimethyl disulphide composition having a masked smell, comprising:
- producing dimethyl disulphide (DMDS) having odorous volatile impurities of methyl mercaptan (MM) and dimethyl sulphide (DMS);
- reducing the volatile impurities to provide, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan (MM), and less than 100 ppm of dimethyl sulphide (DMS);
- and
- adding an amount of up to 1% of at least one odor-masking agent, wherein said at least one odor-masking agent is selected from the esters of the formula:
- R1CO2R2 (I)
- in which R1 represents an optionally unsaturated, linear or branched hydrocarbon radical containing from 1 to 4 carbon atoms and R2 represents an optionally unsaturated, linear, branched or cyclic hydrocarbon radical containing from 2 to 8 carbon atoms.
3 more elements
A method of making a dimethyl disulphide composition having a masked smell, comprising:
- producing dimethyl disulphide (DMDS) having odorous volatile impurities of methyl mercaptan (MM) and dimethyl sulphide (DMS);
- reducing the volatile impurities to provide, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan (MM), and less than 100 ppm of dimethyl sulphide (DMS);
- and
- adding an amount of up to 1% of at least one odor-masking agent;
- wherein the composition further comprises an orthophthalate corresponding to the formula:
- in which the symbols R3 and R4, which are identical or different, each represent an optionally unsaturated, linear, branched or cyclic hydrocarbon radical containing from 1 to 8 carbon atoms.
3 more elements
Dependencies are inferred from the claim text.