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US4238304A
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Method for improved recovery of tall oil from black liquors
Assignee: RM Engineered Products Inc
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Filing: 1979-08-30
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Granted: 1980-12-09
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Expires: 1999-08-30
Abstract
Abstract Acidulated black liquor soap from a paper making process is subjected to an electrical potential gradient, in order to improve the yield of tall oil recoverable from the sludge portion of acidulated soap upon separation.
Inventors
- 👤 Jerry Zucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:29
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007; B; B01; B01D; B01D17/00; B01D17/06; B01D21/00; B01D21/0009; B01D43/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
A method for improving recovery of tall oil from black liquor obtained from a paper making process, comprising the steps of first separating the alkaline black liquor soap from the black liquor, acidifying the black liquor soap to a stable pH of from about 2.0 to about 2.5 until the soap is substantially converted into the acid form, whereby the acidified soap will separate into layers including an upper tall oil layer and a lower sludge layer containing tall oil, applying an electrical potential to said acidified soap with a voltage gradient in the range of about one to about 100 volts for a time sufficient to cause liberation of tall oil from the sludge layer without substantial hydrolysis, and removing the tall oil from the liquor.
Claim 2
Independent Claim
127 words
A method for improving recovery of tall oil from black liquor obtained from a paper making process, comprising the steps of first separating the alkaline black liquor soap from the black liquor, acidifying the black liquor soap to a stable pH of from about 2.0 to about 2.5 until the soap is substantially converted into the acid form, whereby the acidified soap will separate into layers including an upper tall oil layer and a lower sludge layer containing tall oil, applying an electrical potential to said acidified soap with a voltage gradient in the range of about one to about 100 volts for a time sufficient to cause liberation of tall oil from the sludge layer without substantial hydrolysis, and removing the tall oil from the liquor.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the electric potential is applied between spaced electrodes in conductive contact with the acidified liquor.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the electrical potential is applied only to about the upper half of the acidified liquor.
Claim 5
Dependent Claim
22 words
The method of claim 2 wherein the electric potential is direct current, and the spaced electrodes are alternating positive and negative electrodes.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein the voltage is less than 15 volts.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein the application of electrical potential is discontinued and the acidified liquor is allowed to stand prior to the removal of the separated tall oil.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein the tall oil is separated from the acidified liquor with a centrifuge.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein said electrical potential is applied across said acidified liquor while passing through said centrifuge.
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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |