US3719587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purging and washing coal naphtha to remove dihydrogen sulfide and basic nitrogen
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-06-30
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Granted: 1973-03-06
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Expires: 1990-06-30
Abstract
Abstract Coal-derived naphtha boiling within the range from 80* F. to 450* F. has been found to contain sulfur as H2S and nitrogen as basic nitrogen compounds, particularly after the extract has been hydrocracked. By the present invention, the H2S is removed by purging the naphtha with an inert gas such as nitrogen, C1-C3 hydrocarbons, hydrogen, flue gas, CO2, and mixtures thereof. Purging conditions may include a temperature from about 40* F. to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 50 SCF/B to about 300 SCF/B. The basic nitrogen compounds are removed by washing the naphtha with water or with a dilute aqueous solution of strong acids. A concentration of 0 to 10 weight percent of acids, such as sulfuric acid, hydrochloric acid, phosphoric acid, and acetic acid, are suitably employed. Washing conditions are generally the same as those to be employed in the purging step and may include a temperature from about 40* F. to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 0.01 volume of acid per volume of naphtha to about 1.0 volume of acid per volume of naphtha.
Inventors
- 👤 J Karchmer
- 👤 R Pennington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:55
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/08; C10G27/00; C10G27/04; C10G53/00; C10G53/02; C10G53/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
6 words
purging said fraction with nitrogen, and
Claim 2
Dependent Claim
6 words
purging said fraction with nitrogen, and
Claim 3
Dependent Claim
30 words
purging said fraction with a molecular oxygen-free purge gas which is inert to the constituents of said fraction to remove substantially all of the free H2S in said fraction, and
Claim 4
Dependent Claim
30 words
purging said fraction with a molecular oxygen-free purge gas which is inert to the constituents of said fraction to remove substantially all of the free H2S in said fraction, and
Claim 5
Dependent Claim
30 words
purging said fraction with a molecular oxygen-free purge gas which is inert to the constituents of said fraction to remove substantially all of the free H2S in said fraction, and
Claim 6
Dependent Claim
30 words
purging said fraction with a molecular oxygen-free purge gas which is inert to the constituents of said fraction to remove substantially all of the free H2S in said fraction, and
Claim 7
Independent Claim
69 words
A method of treating a hydrocracked coal extract fraction boiling within the range from about 125* F. to about 400* F., containing at least 20 wppm of sulfur and at least 20 wppm of nitrogen, substantially alL of said sulfur being present as H2S and substantially all of said nitrogen occurring as basic nitrogen, which comprises: within 72 hours after said fraction is obtained by fractionation, in indifferent order:
Claim 8
Independent Claim
69 words
A method of treating a hydrocracked coal extract fraction boiling within the range from about 125* F. to about 400* F., containing at least 20 wppm of sulfur and at least 20 wppm of nitrogen, substantially alL of said sulfur being present as H2S and substantially all of said nitrogen occurring as basic nitrogen, which comprises: within 72 hours after said fraction is obtained by fractionation, in indifferent order:
Claim 9
Independent Claim
71 words
A method of treating a hydrocracked coal extract fraction boiling within the range from about 125* F. to about 400* F., containing from 100 to 200 wppm of sulfur and from 200 to 300 wppm of nitrogen, substantially all of said sulfur being present as H2S and substantially all of said nitrogen occurring as basic nitrogen, which comprises: within 72 hours after said fraction is obtained by fractionation, in indifferent order:
Claim 10
Independent Claim
71 words
A method of treating a hydrocracked coal extract fraction boiling within the range from about 125* F. to about 400* F., containing from 100 to 200 wppm of sulfur and from 200 to 300 wppm of nitrogen, substantially all of said sulfur being present as H2S and substantially all of said nitrogen occurring as basic nitrogen, which comprises: within 72 hours after said fraction is obtained by fractionation, in indifferent order:
Claim 11
Dependent Claim
111 words
washing said fraction with water to remove substantially all of said basic nitrogen compounds, and recovering a purged and washed product having a substantially lower nitrogen and sulfur content than said fraction, said purging step being carried out at a temperature from about 40* F. to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 50 SCF/B to about 300 SCF/B, and said washing step being carried out at a temperature from about 40* F., to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 0.01 vol/vol to about 1.0 vol/vol.
Claim 12
Dependent Claim
111 words
washing said fraction with water to remove substantially all of said basic nitrogen compounds, and recovering a purged and washed product having a substantially lower nitrogen and sulfur content than said fraction, said purging step being carried out at a temperature from about 40* F. to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 50 SCF/B to about 300 SCF/B, and said washing step being carried out at a temperature from about 40* F., to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 0.01 vol/vol to about 1.0 vol/vol.
Claim 13
Dependent Claim
26 words
washing said fraction with 0.25 N sulfuric acid, and recovering a purged and washed product having a substantially lower nitrogen and sulfur content than said fraction.
Claim 14
Dependent Claim
26 words
washing said fraction with 0.25 N sulfuric acid, and recovering a purged and washed product having a substantially lower nitrogen and sulfur content than said fraction.
Claim 15
Dependent Claim
111 words
washing said fraction with water to remove substantially all of said basic nitrogen compounds, and recovering a purged and washed product having a substantially lower nitrogen and sulfur content than said fraction, said purging step being carried out at a temperature from about 40* F. to about 200* F. a pressure from about 0 psig to about 150 psig, and a treat rate from about 50 SCF/B to about 300 SCF/B, and said washing step being carried out at a temperature from about 40* F. to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 0.01 vol/vol to about 1.0 vol/vol.
Claim 16
Dependent Claim
111 words
washing said fraction with water to remove substantially all of said basic nitrogen compounds, and recovering a purged and washed product having a substantially lower nitrogen and sulfur content than said fraction, said purging step being carried out at a temperature from about 40* F. to about 200* F. a pressure from about 0 psig to about 150 psig, and a treat rate from about 50 SCF/B to about 300 SCF/B, and said washing step being carried out at a temperature from about 40* F. to about 200* F., a pressure from about 0 psig to about 150 psig, and a treat rate from about 0.01 vol/vol to about 1.0 vol/vol.
Claim 17
Independent Claim
73 words
A method of treating a hydrocracked coal extract fraction boiling within the range from about 80* F. to about 450* F., containing from 100 wppm to 200 wppm of sulfur and from 200 wppm to 300 wppm of nitrogen, substantially all of said sulfur being present as H2S and substantially all of said nitrogen occurring as basic nitrogen, which comprises: within 72 hours after said fraction is obtained by fractionation in indifferent order:
Claim 18
Independent Claim
73 words
A method of treating a hydrocracked coal extract fraction boiling within the range from about 80* F. to about 450* F., containing from 100 wppm to 200 wppm of sulfur and from 200 wppm to 300 wppm of nitrogen, substantially all of said sulfur being present as H2S and substantially all of said nitrogen occurring as basic nitrogen, which comprises: within 72 hours after said fraction is obtained by fractionation in indifferent order:
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |