US4479811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the drying and removal of hydrocarbons from gases
Assignee: VEB CHEMIEANLAGENBAUKOMBINAT LEIPZIG-GRIMMA A GERMAN CORP
•
Filing: 1983-02-28
•
Granted: 1984-10-30
•
Expires: 2003-02-28
Abstract
Abstract The invention relates to a method for the drying and removal of hydrocarbons from gases. It is the object of the invention to increase the absorption ability of the solvent for aromatic hydrocarbons including naphthalene and water, to save material and energy, to lower the investment- and operating costs, as well as to avoid operational disturbances and to increase the safety during gas treatment, gas transmittance and gas distribution. This object is accomplished by the invention in that a mixture of glycol, N-methyl-ε-caprolactam and water is used as solvent. The mixture comprises 79.9 to 97 percent by weight of glycol, 2 to 20 percent by weight of N-methyl-ε-caprolactam and 0.1 to 1 percent by weight of water. The regeneration temperature of the charged solvent mixture is 150° to 190° C., preferably 170° C. 3 to 15 percent by weight, preferably 10 percent by weight, of crude benzene is added to the charged solvent mixture. The invention is especially useful for the purification and drying of coal degasification and cracking gases in customary absorption and desorption apparatuses.
Inventors
- 👤 Burkhard Schlicht
- 👤 Christel Sonntag
- 👤 Hans Beise
- 👤 Otto Lindner
- 👤 Klaus Wehner
- 👤 Werner Burk
- 👤 Manfred Gross
- 👤 Hans-Peter Minak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:10
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/14; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/26; B01D53/263; C10K1/16
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
43 words
A solvent for the drying of gas and removal of aromatic hydrocarbons from said gas, said solvent comprising 79.9 to 97 percent by weight of glycol, 2 to 20 percent by weight of N-methyl-ε-caprolactam, and 0.1 to 1 percent by weight of water.
Claim 2
Dependent Claim
43 words
A solvent for the drying of gas and removal of aromatic hydrocarbons from said gas, said solvent comprising 79.9 to 97 percent by weight of glycol, 2 to 20 percent by weight of N-methyl-ε-caprolactam, and 0.1 to 1 percent by weight of water.
Claim 3
Dependent Claim
12 words
The solvent of claim 1 in which the glycol is triethylene glycol.
Claim 4
Dependent Claim
12 words
The solvent of claim 1 in which the glycol is diethylene glycol.
Claim 5
Dependent Claim
16 words
The solvent of claim 1 which is regenerated at a temperature of 150° to 190° C.
Claim 6
Dependent Claim
21 words
The solvent of claim 4, in which 3 to 15 percent by weight of crude benzene is added just before regeneration.
Claim 7
Dependent Claim
20 words
The solvent of claim 5, in which about 10 percent by weight of crude benzene is added just before regeneration.
Claim 8
Dependent Claim
42 words
The solvent of claim 4 which purifies and dries gas to a water vapor dew point ≦ about -5° C., a benzene hydrocarbon content of ≦ about 2.3 g/m 3 i.N., and a naphthalene content of ≦ about 0.33 g/m 3 i.N.
Claim 9
Dependent Claim
15 words
The solvent of claim 4 which is regenerated at a temperature of about 170° C.
Claim 10
Dependent Claim
43 words
The solvent of claim 8 which purifies and dries gas to a water vapor dew point of ≦ about -5° C., a benzene hydrocarbon content of ≦ about 1.4 g/m 3 i.N., and a naphthalene content of ≦ about 0.1 g/m 3 i.N.
Claim 11
Dependent Claim
47 words
A process for drying gas and removing aromatic hydrocarbons from said gas which comprises contacting said gas with a solvent which comprises 79.9 to 97 percent by weight of glycol, 2 to 20 percent by weight of N-methyl-ε-caprolactam and 0.1 to 1 percent by weight of water.
Claim 12
Dependent Claim
47 words
A process for drying gas and removing aromatic hydrocarbons from said gas which comprises contacting said gas with a solvent which comprises 79.9 to 97 percent by weight of glycol, 2 to 20 percent by weight of N-methyl-ε-caprolactam and 0.1 to 1 percent by weight of water.
Claim 13
Dependent Claim
29 words
The process of claim 10 which comprises the additional step of regenerating the solvent at a temperature of 150° to 190° C., after contacting said solvent with said gas.
Claim 14
Dependent Claim
26 words
The process of claim 11 which additionally comprises adding 3 to 15 percent by weight of benzene to said solvent just before said solvent is regenerated.
Claim 15
Dependent Claim
18 words
The process of claim 11 in which said solvent is regenerated at a temperature of about 170° C.
Claim 16
Dependent Claim
20 words
The process of claim 13 in which about 10 percent by weight of crude benzene is added to said solvent.
Claim 17
Dependent Claim
46 words
The process of claim 13 in which said gas is purified and dried to a water vapor dew point of ≦ about -5° C., a benzene hydrocarbon content of ≦ about 1.4 g/m 3 i.N., and a naphthalene content of ≦ about 0.1 g/m 3 i.N.
Claim 18
Dependent Claim
46 words
The process of claim 11 in which said gas is purified and dried to a water vapor dew point of ≦ about -5° C., a benzene hydrocarbon content of ≦ about 2.3 g/m 3 i.N., and a naphthalene content of ≦ about 0.33 g/m 3 i.N.
Claim 19
Dependent Claim
12 words
The process of claim 10 in which the glycol is triethylene glycol.
Claim 20
Dependent Claim
12 words
The process of claim 10 in which the glycol is diethylene glycol.
References Cited (Backward Citations)
US3656275A
Cited
US3745746A
Cited
US3745747A
Cited
US3857686A
Cited
US4009083A
Cited
US4005997A
Cited
US4052176A
Cited
US4145192A
Cited
SU629955A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |