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US3763017A
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Process of inhibiting decomposition of 1,1,1,2-tetrachloroethane
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1970-06-09
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Granted: 1973-10-02
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Expires: 1990-06-09
Abstract
Abstract This invention is addressed to a new and improved method for inhibiting the decomposition of 1,1,1,2-tetrachloroethane and an inhibited composition formed thereby wherein an inhibitor consisting essentially of an aliphatic aldehyde, an aromatic aldehyde, chlorinated derivatives of the foregoing aldehydes which are soluble in 1,1,1,2-tetrachloroethane with other chlorinated solvents, or cyclic trimers of aliphatic aldehydes and mixtures thereof, and an organic phosphorus compound are added to a solvent composition containing 1,1,1,2tetrachloroethane.
Inventors
- 👤 C Yves
- 👤 C Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02854; C23G5/02896; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
32 words
A composition as defined in claim 1 wherein said aldehyde is selected from the group consisting of butyraldehyde, isobutyraldehyde,benzaldehyde, a mixture of butyraldehyde and benzaldehyde, and a mixture of isobutyraldehyde and benzaldehyde.
Claim 2
Dependent Claim
32 words
A composition as defined in claim 1 wherein said aldehyde compound is present in a ratio of two to 100 moles of aldehyde compound per gram-atom of metal present in said composition.
Claim 3
Dependent Claim
34 words
A composition as defined in claim 1 wherein said organic phosphorus compound is present in a ratio of one to 10 moles of organic phosphorus compound per gram-atom of metal present in said composition.
Claim 4
Dependent Claim
139 words
A composition having improved stability in the presence of iron, copper and nickel metal and chlorides of iron consisting essentially of 1,1,1,2-tetrachloroethane and an inhibitor consisting essentially of an aldehyde selected from the group consisting of trioxane, paracetaldehyde, the cyclic trimer of propionaldehyde, chloral, propionaldehyde, cinnamaldehyde, anisaldehyde, salicylaldehyde, butyraldehyde, isobutyraldehyde, benzaldehyde and mixtures thereof, and an organic phosphorus compound selected from the group consisting of alkylphosphates wherein the alkyl contains one to 12 carbon atoms, and arylphosphates wherein the aryl group contains six to 10 carbon atoms and is selected from the group consisting of phenyl, tolyl and naphthyl, with the aldehyde and the phosphorus compound each being present in an amount to provide at least 1 mole of each of the aldehyde and the phosphorus compound per gram atom of metal present in the dissolved or suspended state.
Claim 5
Dependent Claim
176 words
In the method for the purification of crude 1,1,1,2-tetrachloroethane wherein the crude 1,1,1,2-tetrachloroethane is subjected to distillation at elevated temperatures in the presence of metal selected from the group of iron and alloys thereof, nickel and alloys thereof, copper and alloys thereof, and chlorides of the iron, the improvement comprising adding to the crude 1,1,1,2-tetrachloroethane is an inhibitor composition consisting essentially of an aldehyde compound selected from the group consisting of trioxane, paracetaldehyde, the cyclic trimer of propionaldehyde, chloral, propionaldehyde cinnamaldehyde, anisaldehyde, salicylaldehyde, butyraldehyde, isobutyraldehyde, benzaldehyde and mixtures thereof, and at least one organic phosphorus compound selected from the group consisting of alkylphosphates wherein the alkyl contains one to 12 carbon atoms, and arylphosphates wherein the aryl group contains six to 10 carbon atoms and is selected from the group consisting of phenyl, tolyl and naphthyl, with the aldehyde and the phosphorus compound each being present in an amount to provide at least 1 mole of each of the aldehyde and the phosphorus compound per gram atom of metal present in the dissolved or suspended state.
Claim 6
Dependent Claim
33 words
A method as defined in claim 6 wherein said aldehyde is selected from the group consisting of butyraldehyde, isobutyraldehyde benzaldehyde, a mixture of butyraldehyde and benzaldehyde, and a mixture of isobutyraldehyde and benzaldehyde.
Claim 7
Dependent Claim
29 words
A method as defined in claim 6 wherein the aldehyde inhibitor is added at the ratio of two to 100 moles of aldehyde compound per gram-atom of metal present.
Claim 8
Dependent Claim
34 words
A method as defined in claim 6 wherein said organic phosphorus is added in an amount to provide a ratio of from one to 10 moles of phosphorus compound per gram-atom of metal present.
Claim 9
Dependent Claim
23 words
A method as defined in claim 6 wherein the crude 1,1,1,2-tetrachloroethane is the effluent from a reactor in the preparation of chlorinated hydrocarbons.
Claim 10
Dependent Claim
21 words
A method as defined in claim 6 wherein the crude 1,1,1,2-tetrachloroethane is treated at a temperature within the range of 80*-250*C.
Claim 11
Dependent Claim
27 words
A method as defined in claim 6 wherein the crude 1,1,1,2-tetrachloroethane is treated in a column formed of a metal boiler which catalyzes the decomposition of 1,1,1,2-tetrachloroethane.
Claim 12
Dependent Claim
22 words
A method as defined in claim 12 wherein the inhibitor is added to the crude 1,1,1,2-tetrachloroethane prior to introduction to the column.
Claim 13
Dependent Claim
26 words
A method as defined in claim 12 wherein the inhibitor is added to the crude 1,1,1,2-tetrachloroethane as the crude 1,1,1, 2-tetrachloroethane is introduced to the column.
Claim 14
Dependent Claim
22 words
A method as defined in claim 12 wherein the inhibitor is added to the crude 1,1,1,2-tetrachloroethane in the boiler of the column.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |