US3944389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of chloromethyl methyl ether or bis-chloro-methyl ether
Assignee: Dow Chemical Co
•
Filing: 1973-07-12
•
Granted: 1976-03-16
•
Expires: 1993-07-12
Abstract
Abstract Method for quantitatively determining the presence of chloromethyl methyl ether and/or bis-chloromethyl ether in a fluid.
Inventors
- 👤 Richard A. Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:57
CPC Classifications
G; G01; G01N; G01N31/00; G01N30/00; G01N30/02; G01N30/88; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0013; G01N33/18; G01N33/1826; G01N2030/8886; Y; Y10; Y10T; Y10T436/00; Y10T436/19; Y10T436/196666; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
112 words
A method to determine the presence of chloromethyl methyl ether or bis-chloromethyl ether in a fluid, comprising reacting chloromethyl methyl ether or bis-chloromethyl ether from said fluid with an amount in excess of the stoichiometric amount of an alkali metal salt of an organic hydroxy compound of the formula 1. R--OH wherein R is lower alkyl, phenyl, chlorophenyl, bromophenyl, alkoxy phenyl, or alkyl phenyl or 2. thiophenyl or chlorinated thiophenyl or 3. chlorinated pyridinyl, said compound being dissolved in lower alcohol, running the reaction product through a suitable gas chromatographic column, then passing the eluted components therefrom through a detector and displaying the output of said detector on a suitable readout device.
Claim 2
Independent Claim
112 words
A method to determine the presence of chloromethyl methyl ether or bis-chloromethyl ether in a fluid, comprising reacting chloromethyl methyl ether or bis-chloromethyl ether from said fluid with an amount in excess of the stoichiometric amount of an alkali metal salt of an organic hydroxy compound of the formula 1. R--OH wherein R is lower alkyl, phenyl, chlorophenyl, bromophenyl, alkoxy phenyl, or alkyl phenyl or 2. thiophenyl or chlorinated thiophenyl or 3. chlorinated pyridinyl, said compound being dissolved in lower alcohol, running the reaction product through a suitable gas chromatographic column, then passing the eluted components therefrom through a detector and displaying the output of said detector on a suitable readout device.
Claim 3
Dependent Claim
17 words
The method of claim 1, wherein said reagent is an alkali metal salt of a lower alcohol.
Claim 4
Dependent Claim
19 words
The method of claim 1, wherein said reagent is an alkali metal salt of phenol or an alkyl phenol.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein said reagent is an alkali metal salt of a chlorophenol.
Claim 6
Dependent Claim
16 words
The method of claim 1, wherein said reagent is an alkali metal salt of a bromophenol.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said reagent is an alkali metal salt of an alkoxy phenol.
Claim 8
Dependent Claim
20 words
The method of claim 1, wherein said reagent is an alkali metal salt of thiophenol or of a chlorinated thiophenol.
Claim 9
Dependent Claim
17 words
The method of claim 1, wherein said reagent is an alkali metal salt of a chlorinated pyridinol.
Claim 10
Dependent Claim
10 words
The method of claim 1, wherein said fluid is air.
Claim 11
Dependent Claim
21 words
The method of claim 1, wherein said fluid comprises a liquid mixture of ethylene dichloride, methanol, methylal and chloromethyl methyl ether.
Claim 12
Dependent Claim
29 words
The method of claim 1, wherein said compound is present in at least 10 times the stoichiometric amount needed for the reaction with chloromethyl methyl ether or bis-chloromethyl ether.
Claim 13
Dependent Claim
11 words
The method of claim 1, wherein said compound is sodium phenate.
Claim 14
Dependent Claim
11 words
The method of claim 1, wherein said compound is sodium methoxide.
Claim 15
Dependent Claim
11 words
The method of claim 1, wherein said compound is sodium ethoxide.
Claim 16
Dependent Claim
14 words
The method of claim 1, wherein said compound is the sodium salt of 2,4,6-trichlorophenol.
Claim 17
Dependent Claim
16 words
The method of claim 1, wherein said compound is a sodium salt of a chlorinated phenol.
Claim 18
Independent Claim
141 words
A method to determine the presence of chloromethyl methyl ether or bis-chloromethyl ether in a gas comprising passing a predetermined amount of gas through a confined stoichiometric excess of an alkali metal salt of an organic hydroxy compound selected from the group consisting of a lower alcohol, phenol, a chlorophenol, a bromophenol, an alkyl phenol, an alkoxy phenol, a chlorinated pyridinol, thiophenol or a chlorinated thiophenol which hydroxy compound is dissolved in lower alcohol, adding water and hydrocarbon solvent to said compound, agitating the mixture of compound, water and solvent, partitioning said hydrocarbon solvent from the remainder of said mixture, withdrawing part of said hydrocarbon solvent and applying said withdrawn part to suitable gas chromatographic apparatus, applying eluted components from said chromatographic apparatus to a suitable detector providing an output signal, and applying said output signal to a suitable readout device.
Claim 19
Independent Claim
141 words
A method to determine the presence of chloromethyl methyl ether or bis-chloromethyl ether in a gas comprising passing a predetermined amount of gas through a confined stoichiometric excess of an alkali metal salt of an organic hydroxy compound selected from the group consisting of a lower alcohol, phenol, a chlorophenol, a bromophenol, an alkyl phenol, an alkoxy phenol, a chlorinated pyridinol, thiophenol or a chlorinated thiophenol which hydroxy compound is dissolved in lower alcohol, adding water and hydrocarbon solvent to said compound, agitating the mixture of compound, water and solvent, partitioning said hydrocarbon solvent from the remainder of said mixture, withdrawing part of said hydrocarbon solvent and applying said withdrawn part to suitable gas chromatographic apparatus, applying eluted components from said chromatographic apparatus to a suitable detector providing an output signal, and applying said output signal to a suitable readout device.
Claim 20
Dependent Claim
13 words
The method of claim 17, wherein said detector is an electron capture detector.
Claim 21
Dependent Claim
11 words
The method of claim 17, wherein said hydrocarbon solvent is hexane.
Claim 22
Dependent Claim
17 words
The method of claim 17, wherein said gas chromatographic apparatus includes a lightly loaded glass chromatographic column.
Claim 23
Dependent Claim
17 words
The method of claim 17, wherein said compound is heated before said water and solvent are added.
Claim 24
Independent Claim
84 words
A method of determining the presence of chloromethyl methyl ether or bis-chloromethyl ether in a liquid, comprising mixing a predetermined amount of said liquid with a stoichiometric excess amount of an alkali metal salt of a lower alcohol, said salt being dissolved in a lower alcohol, to form a derivative compound, running said derivative through a suitable gas chromatographic apparatus, passing material eluting from said apparatus through a suitable detector providing an output signal, and recording said output signal on a suitable readout device.
Claim 25
Independent Claim
84 words
A method of determining the presence of chloromethyl methyl ether or bis-chloromethyl ether in a liquid, comprising mixing a predetermined amount of said liquid with a stoichiometric excess amount of an alkali metal salt of a lower alcohol, said salt being dissolved in a lower alcohol, to form a derivative compound, running said derivative through a suitable gas chromatographic apparatus, passing material eluting from said apparatus through a suitable detector providing an output signal, and recording said output signal on a suitable readout device.
References Cited (Backward Citations)
US3807217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |