US4042486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the conversion of pitch into crystalloidal pitch
Assignee: Kureha Corp
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Filing: 1976-03-10
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Granted: 1977-08-16
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Expires: 1996-03-10
Abstract
Abstract Crystalloidal pitch is obtained by subjecting solid pitch particles measuring not more than 5 mm in cross-sectional equivalent diameter to a treatment to prevent cohesion and subsequently bringing the cohesion-proof solid pitch particles into contact with a non-oxidative gas at temperatures of from 350° C to 550° C while maintaining a gas flow rate sufficient to provide a suspension wherein the gas constitutes at least 30% by volume. The crystalloid pitch is useful as a precursor for various carbon products.
Inventors
- 👤 Kiro Asano
- 👤 Humio Tamura
- 👤 Tsuyoshi Saito
- 👤 Yoshio Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:05
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/14; C01; C01B; C01B32/00; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
103 words
A process for converting pitch to a crystalloid, which process comprises: a. providing a bed of solid amorphous pitch particles, said particles being not more than 5 mm in cross-sectional equivalent diameter, said bed having a gas void space of not less than 30% by volume; b. treating the surfaces of said pitch particles in said bed by coating, oxidation or solvent extraction to reduce susceptibility to cohesion; and c. contacting said particles in said bed with a hot non-oxidative gas to heat said particles to a temperature within the range of from 350°-550° C and convert the pitch to the crystalloidal state.
Claim 2
Dependent Claim
103 words
A process for converting pitch to a crystalloid, which process comprises: a. providing a bed of solid amorphous pitch particles, said particles being not more than 5 mm in cross-sectional equivalent diameter, said bed having a gas void space of not less than 30% by volume; b. treating the surfaces of said pitch particles in said bed by coating, oxidation or solvent extraction to reduce susceptibility to cohesion; and c. contacting said particles in said bed with a hot non-oxidative gas to heat said particles to a temperature within the range of from 350°-550° C and convert the pitch to the crystalloidal state.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein said treatment for reducing susceptibility to cohesion is by coating the surface of the pich particles with a metal, metal salt, or thermosetting resin prior to contact with said non-oxidative gas.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said treatment for reducing susceptibility to cohesion is by oxidizing the surfaces of said particles.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said treatment for reducing susceptibility to cohesion is by extracting low-boiling components or low-melting components from said pitch particles.
Claim 6
Dependent Claim
25 words
The process of claim 3 additionally comprising extracting low-boiling components or low-melting components from said solid pitch particles by contacting said particles with a solvent.
Claim 7
Dependent Claim
14 words
The process of claim 2 wherein said metal is copper, chromium, nickel, or silver.
Claim 8
Dependent Claim
17 words
The process of claim 2 wherein said metal salt is a chloride of nickel, iron, or aluminum.
Claim 9
Dependent Claim
20 words
The process of claim 2 wherein said thermosetting resin is a phenolic resin, a furan resin, or an epoxy resin.
Claim 10
Dependent Claim
21 words
The process of claim 3 wherein said oxidizing is accomplished by contacting said pitch particles with at least one oxidative gas.
Claim 11
Dependent Claim
21 words
The process of claim 5 wherein said oxidizing is accomplished by contacting said pitch particles with at least one oxidative gas.
Claim 12
Dependent Claim
23 words
The process of claim 9 wherein said oxidative gas is oxygen, ozone, an oxide of sulfur, an oxide of nitrogen, or a halogen.
Claim 13
Dependent Claim
23 words
The process of claim 10 wherein said oxidative gas is oxygen, ozone, an oxide of sulfur, an oxide of nitrogen, or a halogen.
Claim 14
Dependent Claim
27 words
The process of claim 9 wherein said oxidative gas is diluted with an inert gas selected from the group consisting of nitrogen, argon, steam, and complete-combustion gas.
Claim 15
Dependent Claim
22 words
The process of claim 13 wherein said inert gas is selected from the group consisting of nitrogen, argon, steam, and complete-combustion gas.
Claim 16
Dependent Claim
38 words
The process of claim 3 wherein said oxidizing is by contacting said pitch particles with an oxidizing agent selected from the group consisting of hydrogen peroxide, chlorides, hypochlorites, perchlorates, nitric acid, ferric chloride, dichromates, acids, permanganates, and peracetates.
Claim 17
Dependent Claim
38 words
The process of claim 5 wherein said oxidizing is by contacting said pitch particles with an oxidizing agent selected from the group consisting of hydrogen peroxide, chlorides, hypochlorites, perchlorates, nitric acid, ferric chloride, dichromates, acids, permanganates, and peracetates.
Claim 18
Dependent Claim
31 words
The process of claim 4 wherein said solvent is selected from the group consisting of acetone, methylethyl ketone, benzene, toluene, hexane, heptane, cyclohexane, methyl alcohol, chloroform, carbon tetrachloride and mixtures thereof.
Claim 19
Dependent Claim
31 words
The process of claim 5 wherein said solvent is selected from the group consisting of acetone, methylethyl ketone, benzene, toluene, hexane, heptane, cyclohexane, methyl alcohol, chloroform carbon tetrachloride and mixtures thereof.
Claim 20
Dependent Claim
18 words
The process of claim 1 wherein said non-oxidative gas is nitrogen, argon, hydrogen, steam or a complete-combustion gas.
Claim 21
Dependent Claim
15 words
The process of claim 1 wherein the particles are fluidized by the hot non-oxidative gas.
Claim 22
Dependent Claim
20 words
The process of claim 1 wherein said amorphous pitch has a softening point of not less than about 70° C.
Claim 23
Dependent Claim
10 words
The crystalloidal pitch obtained by the process of claim 1.
References Cited (Backward Citations)
US3812240A
Cited
US3974264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |