US3607083A
Expired / Lapsed
US
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Analysis of kraft liquors
Assignee: Westvaco Corp
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Filing: 1969-11-18
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Granted: 1971-09-21
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Expires: 1989-11-18
Abstract
Abstract Kraft cooking liquors used in the pulping of wood are analyzed for apparent causticity by utilizing conductivity measurements taken before and after precipitation of the soluble carbonates in the liquors. The differential conductivity determined correlates directly with the apparent causticity of the cooking liquor.
Inventors
- 👤 Anirudh K Chowdhry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/021; G01N33/00; G01N33/34; G01N33/343
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The process of claim 1 wherein the soluble carbonates are precipitated by the addition of barium chloride in solution to the alkaline cooking liquor.
Claim 2
Dependent Claim
24 words
The process of claim 1 which includes, before step (a), the step of cooling the cooking liquor to a temperature of about 25* C.
Claim 3
Dependent Claim
130 words
The process of determining the apparent causticity of a kraft cooking liquor used in the pulping of wood, wherein the liquor contains soluble carbonates, which comprises the steps of: a. filtering suspended materials from a kraft cooking liquor; b. passing the liquor through an electrical conductivity measuring device; c. measuring the electrical conductivity of the liquor for a first time; d. adding a solution of barium chloride to the liquid to precipitate the soluble carbonates in the liquor; e. filtering the precipitated carbonates from the liquor; f. passing the liquor through an electrical conductivity measuring device; g. and measuring the electrical conductivity of the liquor for a second time, the difference between the conductivity measurements of steps (c) and (g) corresponding directly to the apparent causticity of the cooking liquor.
Claim 4
Dependent Claim
27 words
The process of claim 4 which includes, between steps (a) and (b) the additional step of cooling the cooking liquor to a temperature of about 25* C.
References Cited (Backward Citations)
US2559090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |