US4068706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal stabilization of chlorobenzenes
Assignee: EIDP Inc
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Filing: 1976-04-15
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Granted: 1978-01-17
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Expires: 1996-04-15
Abstract
Abstract Chlorobenzenes with 2 to 5 chlorine substituents particularly trichlorobenzenes, can be used in a heat transfer method, particularly when contained in steel or aluminum vessels and at temperatures in the range of 260-450° C, by contact with a thermal stabilizing amount of a solid acid acceptor selected from A. a carbonate, phosphate, borate, or molybdate of an alkali metal or an alkaline earth metal or B. an oxide of zinc, cadmium or an alkaline earth metal.
Inventors
- 👤 Walter Mahler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:59
CPC Classifications
C; C07; C07C; C07C25/00; C07C25/02; C09; C09K; C09K5/00; C09K5/02; C09K5/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
103 words
A method of heat transfer wherein the least one chlorobenzene of the formula C.sub.6 H.sub.6-x Cl.sub.x where x is 2 to 5 is cycled through a thermal gradient including temperatures above about 260° C, the improvement which comprises contacting said chlorobenzene with a thermal stabilizing amount of a solid acid acceptor selected from a. a carbonate, phosphate, borate or molybdate of a Group I-A alkali metal of atomic number 3-55 of a Group II-A alkaline earth metal of atomic number 12-56, or b. an oxide of a Group II-A metal of atomic number 12-56 or a Group II-B metal of atomic number 30-48.
Claim 2
Independent Claim
103 words
A method of heat transfer wherein the least one chlorobenzene of the formula C.sub.6 H.sub.6-x Cl.sub.x where x is 2 to 5 is cycled through a thermal gradient including temperatures above about 260° C, the improvement which comprises contacting said chlorobenzene with a thermal stabilizing amount of a solid acid acceptor selected from a. a carbonate, phosphate, borate or molybdate of a Group I-A alkali metal of atomic number 3-55 of a Group II-A alkaline earth metal of atomic number 12-56, or b. an oxide of a Group II-A metal of atomic number 12-56 or a Group II-B metal of atomic number 30-48.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said chlorobenzene is in contact with ferritic steel, austenitic steel or aluminum.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein water is present in an amount of from 0.005 to 1% by weight of said chlorobenzene.
Claim 5
Dependent Claim
30 words
Method of claim 3 wherein said chlorobenzene is trichlorobenzene and said trichlorobenzene is contacted with said acid acceptor at a temperature in the range of 260° C to 450° C.
Claim 6
Dependent Claim
10 words
Method of claim 4 wherein said stabilizer is sodium carbonate.
Claim 7
Dependent Claim
10 words
Method of claim 4 wherein said stabilizer is magnesium oxide.
Claim 8
Dependent Claim
10 words
Method of claim 4 wherein said stabilizer is zinc oxide.
Claim 9
Dependent Claim
26 words
The method of claim 2 wherein the chlorobenzene is contacted with said acid acceptor at a temperature in the range of 260° C to 450° C.
Claim 10
Dependent Claim
10 words
The method fo claim 8 wherein said chlorobenzene is trichlorobenzene.
Claim 11
Dependent Claim
10 words
Method of claim 9 wherein said stabilizer is sodium carbonate.
Claim 12
Dependent Claim
10 words
Method of claim 9 wherein said stabilizer is magnesium oxide.
Claim 13
Dependent Claim
10 words
Method of claim 9 wherein said stabilizer is zinc oxide.
Claim 14
Dependent Claim
9 words
Method of claim 8 wherein said chlorobenzene is dichlorobenzene.
Claim 15
Dependent Claim
10 words
Method of claim 13 wherein said stabilizer is sodium carbonate.
Claim 16
Dependent Claim
10 words
Method of claim 13 wherein said stabilizer is magnesium oxide.
Claim 17
Dependent Claim
99 words
In a method of heat transfer wherein at least one chlorobenzene selected from the class consisting of dichlorobenzene and trichlorobenzene is cycled through a thermal gradient including temperatures above about 260° C., the improvement which comprises contacting said chlorobenzene with a thermal stabilizing amount of a solid acid acceptor selected from the class consisting of sodium borate and Na 3 PO 4 , wherein said chlorobenzene is in contact with ferritic steel, austenitic steel or aluminum, and wherein said chlorobenzene is contacted with said acid acceptor at a temperature in the range of about 260° C to 450° C.
Claim 18
Dependent Claim
99 words
In a method of heat transfer wherein at least one chlorobenzene selected from the class consisting of dichlorobenzene and trichlorobenzene is cycled through a thermal gradient including temperatures above about 260° C., the improvement which comprises contacting said chlorobenzene with a thermal stabilizing amount of a solid acid acceptor selected from the class consisting of sodium borate and Na 3 PO 4 , wherein said chlorobenzene is in contact with ferritic steel, austenitic steel or aluminum, and wherein said chlorobenzene is contacted with said acid acceptor at a temperature in the range of about 260° C to 450° C.
Claim 19
Dependent Claim
28 words
The method of claim 16 wherein said chlorobenzene is trichlorobenzene and wherein water is present in an amount of from 0.005 to 1% by weight of said chlorobenzene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |