US3706181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the safe handling of c{11 {11 and c{11 {11 acetylenic hydrocarbons
Assignee: Tenneco Polymers Inc
•
Filing: 1970-11-20
•
Granted: 1972-12-19
•
Expires: 1990-11-20
Abstract
Abstract An improved safe method for the handling, concentration, purification, storage, and transportation of C3 and C4 acetylenic hydrocarbons involves contacting a gas stream that contains 10 mole percent or less of these compounds with activated carbon to form compositions that comprise activated carbon on whose surface about 2 percent to 10 percent, based on the weight of the carbon, of C3 and/or C4 acetylenic compounds have been adsorbed. These activated carbon compositions, which are air stable and which cannot be detonated, can be handled, stored and transported without appreciable danger of explosion. Concentrated and purified acetylenic compounds can be recovered by stripping the carbon with, for example, a nitrogen-methylene chloride mixture. Further improvement in the safety of the method results when the pyrolysis gas is diluted with an inert, non-explosive gas that has carbon adsorption characteristics similar to those of the C4 acetylenic compounds prior to the treatment of the activated carbon with the pyrolysis gas stream.
Inventors
- 👤 David G Walker
- 👤 Donald A Keyworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:53
CPC Classifications
C; C10; C10L; C10L3/00; C10L3/02; C10L3/04; C07; C07C; C07C11/00; C07C11/22
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
131 words
The process of claim 1 wherein in Step (a) the hydrocarbon pyrolysis gas is passed into a first bed of activated carbon and the gas leaving said first bed is passed into a second bed of activated carbon until the surface of the carbon in the first bed is saturated with diacetylene and vinylacetylene and the surface of the carbon in the second bed is saturated with methylacetylene and allene and in Step (b) streams of inert gas are passed through the beds of saturated activated carbon thereby desorbing the acetylenic compounds and forming a gas stream that contains 30 to 50 mole percent of diacetylene and vinylacetylene in said inert gas and a gas stream that contains 30 to 50 mole percent of methylacetylene and allene in said inert gas.
Claim 2
Dependent Claim
133 words
The process for the separation of acetylenic compounds having three or four carbon atoms from a hydrocarbon pyrolysis gas that contains from 1 mole percent to 10 mole percent of said acetylenic compounds that comprises the following steps: a. passing said hydrocarbon pyrolysis gas through a bed of activated carbon until the surface of the carbon is saturated with adsorbed acetylenic compounds having three or four caRbon atoms and b. passing a stream of inert gas that is a mixture comprising 50 to 75 mole percent of nitrogen and 25 to 50 mole percent of methylene chloride through a bed of saturated activated carbon thereby desorbing the acetylenic compounds and forming a gas stream that contains about 30 to 50 mole percent of acetylenic compounds having three or four carbon atoms in nitrogen.
Claim 3
Dependent Claim
156 words
The process for the separation of acetylenic compounds having three or four carbon atoms from a hydrocarbon pyrolysis gas that contains from 1 mole percent to 10 mole percent of said acetylenic compounds that comprises the following steps: a. mixing the hydrocarbon pyrolysis gas with about 30 percent to 70 percent of its weight of an inert, non-explosive gas that has carbon adsorption characteristics similar to those of diacetylene and vinylacetylene, b. passing the resulting gas mixture through a bed of activated carbon until the surface of the carbon is saturated with adsorbed acetylenic compounds having three or four carbon atoms and said inert, non-explosive gas, and c. passing a stream of inert gas through the bed of saturated activated carbon thereby desorbing the acetylenic compounds and said inert, non-explosive gas and forming a gas stream that contains about 30 to 50 mole percent of acetylenic compounds and said inert, non-explosive gas in said inert gas.
Claim 4
Dependent Claim
27 words
The method of claim 4 wherein the hydrocarbon pyrolysis gas is mixed with about 45 percent to 60 percent of its weight of said inert, non-explosive gas.
Claim 5
Dependent Claim
19 words
The method of claim 4 wherein the inert, non-explosive gas with which the pyrolysis gas is mixed is n-butane.
Claim 6
Dependent Claim
157 words
The process for the separation of acetylenic compounds having three or four carbon atoms from a hydrocarbon pyrolysis gas stream that contains from 1 mole percent to 10 mole percent of said acetylenic compounds that comprises the steps of a. passing the hydrocarbon pyrolysis gas into a first bed of activated carbon and the gas leaving said first bed into a second bed of activated carbon until the surface of the carbon in the first bed is saturated with diacetylene and vinylacetylene and the surface of the carbon in the second bed is saturated with methylacetylene and allene and b. passing into each of said beds of gas-saturated carbon a stream of inert gas that is a mixture comprising 50 to 75 mole percent of nitrogen and 25 to 50 mole percent of methylene chloride thereby desorbing the acetylenic compounds and forming gas streams that contain 20 to 50 mole percent of said acetylenic compounds in nitrogen.
Claim 7
Dependent Claim
80 words
The process of claim 7 wherein in Step (b) the stream of nitrogen and methylene chloride is passed through said first bed of saturated activated carbon to form a gas stream that contains about 20 to 50 mole percent of diacetylene and vinylacetylene in nitrogen and said gas stream is passed through a sulfuric acid scrubber to give a gas stream that comprises about 20 to 40 mole percent of diacetylene and about 60 to 80 mole percent of nitrogen.
Claim 8
Dependent Claim
30 words
The process of claim 8 wherein the gas stream that comprises diacetylene and nitrogen is passed through a liquid nitrogen trap to condense the nitrogen and yield substantially pure diacetylene.
Claim 9
Dependent Claim
28 words
The process of claim 7 wherein the inert gas used to separate the acetylenic compounds from the gas-saturated carbon is nitrogen saturated with methylene chloride at ambient temperature.
Claim 10
Dependent Claim
217 words
The process for the separation of acetylenic compounds having three or four carbon atoms from a hydrocarbon pyrolysis gas that contains from 1 mole percent to 10 mole percent of said acetylenic compounds that comprises the steps of a. mixing the hydrocarbon pyrolysis gas with about 30 percent to 70 percent of its weight of an inert, non-explosive gas that has an affinity for carbon adsOrption that is similar to that of diacetylene and vinylacetylene, b. passing the resulting gas mixture into a first bed of activated carbon and the gas leaving the first bed into a second bed of activated carbon until the surface of the carbon in said first bed is saturated with diacetylene, vinylacetylene, and said inert, non-explosive gas and the surface of the carbon in the second bed is saturated with methylacetylene, allene, and said inert, non-explosive gas and c. passing into each of said beds of gas-saturated carbon a stream of inert gas that is a mixture comprising 50 to 75 mole percent of nitrogen and 25 to 50 mole percent of methylene chloride thereby desorbing the acetylenic compounds and the inert, non-explosive gas from the surface of the carbon and forming gas streams that contain 20 to 50 mole percent of said acetylenic compounds and said inert, non-explosive gas in nitrogen.
Claim 11
Dependent Claim
12 words
The process of claim 11 wherein the inert, non-explosive gas is n-butane.
Claim 12
Dependent Claim
46 words
The process of claim 11 wherein the gas stream that contains 20 to 50 mole percent of diacetylene, vinylacetylene, and said inert, non-explosive gas in nitrogen is passed through a sulfuric acid scrubber to form a gas stream that contains diacetylene, the non-explosive gas, and nitrogen.
Claim 13
Dependent Claim
70 words
A non-explosive composition that comprises activated carbon on whose surface has been adsorbed 2 percent to 5 percent, based on the weight of activated carbon, of an acetylenic component selected from the group consisting of methylacetylene, diacetylene, vinylacetylene, and mixtures thereof and 2 percent to 5 percent, based on the weight of activated carbon, of an inert, non-explosive gas having carbon adsorption characteristics similar to those of diacetylene and vinylacetylene.
Claim 14
Dependent Claim
11 words
The composition of claim 14 wherein the acetylenic component comprises diacetylene.
Claim 15
Dependent Claim
16 words
The composition of claim 14 wherein the acetylenic component is a mixture of diacetylene and vinylacetylene.
Claim 16
Dependent Claim
12 words
The composition of claim 14 wherein the inert, non-explosive gas is n-butane.
Claim 17
Dependent Claim
13 words
The composition of claim 14 wherein the inert, non-explosive gas is ethyl chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |