US4176043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing binder pitches
Assignee: Cindu Chemie BV
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Filing: 1977-06-20
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Granted: 1979-11-27
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Expires: 1997-06-20
Abstract
Abstract A process for preparing a binder pitch, in which a high-aromatic residual fraction from petroleum raw materials is mixed with a coal tar fraction in weight ratios of about 1:9 to 9:1 and heated, while during heating the mixture is kept in contact with a dehydrogenating agent, in particular an oxygen-containing gas.
Inventors
- 👤 Johannes N. van Eijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:30
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/005; C10C3/02; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A process for preparing a binder pitch which comprises: intimately contacting a mixture, with a weight ratio of from 9:1 to 1:9, of a petroleum residual fraction selected from the group consisting of high aromatic residue pitch having a ring and ball softening point of 50° to 80° C. and oil cracking residual oil having a boiling range of about 300° to 400° C. and a coal tar fraction selected from the group consisting of coal tar pitch having a ring and ball softening point of at least 80° C. and tar oil having an initial boiling point above 350° C. at a temperature above 300° C. with a dehydrogenating agent selected from the group consisting of oxygen, chlorine and sulfur for a sufficient length of time to form a binder pitch having a ring and ball softening point of 50° to 200° C., a C 2 resin content of at least 15% and a coke number of at least 40%.
Claim 2
Dependent Claim
161 words
A process for preparing a binder pitch which comprises: intimately contacting a mixture, with a weight ratio of from 9:1 to 1:9, of a petroleum residual fraction selected from the group consisting of high aromatic residue pitch having a ring and ball softening point of 50° to 80° C. and oil cracking residual oil having a boiling range of about 300° to 400° C. and a coal tar fraction selected from the group consisting of coal tar pitch having a ring and ball softening point of at least 80° C. and tar oil having an initial boiling point above 350° C. at a temperature above 300° C. with a dehydrogenating agent selected from the group consisting of oxygen, chlorine and sulfur for a sufficient length of time to form a binder pitch having a ring and ball softening point of 50° to 200° C., a C 2 resin content of at least 15% and a coke number of at least 40%.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said dehydrogenating agent is an oxygen containing gas.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the oxygen containing gas is air.
Claim 5
Dependent Claim
22 words
The process of claim 3 wherein the heated mixture is contacted with air at a rate of about 20 and 500 liters/hour/kg.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the dehydrogenating agent is a chlorine containing gas.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the heated mixture is contacted with chlorine gas at a rate of about 40 to 80 liters/hour/kg.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the dehydrogenating agent is sulfur.
Claim 9
Dependent Claim
26 words
The process of claim 7 wherein sulfur in an amount of from about 2 to 20 grams/kg is added to said mixture before or during heating.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein the mixture is intimately contacted with the dehydrogenating agent at from about 300° to 350° C.
Claim 11
Dependent Claim
14 words
The process of claim 4 wherein the air rate is 200 to 400 liters/hours/kg.
Claim 12
Dependent Claim
26 words
The process of claim 1 wherein the weight ratio of said high aromatic residual fraction to said coal tar fraction is from about 1:5 to 5:1.
References Cited (Backward Citations)
US2348832A
Cited
US3970542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |