CA2589566A1 - Method to lower the release of hazardous air pollutants from kraft recovery process - Google Patents
Method to lower the release of hazardous air pollutants from kraft recovery process Download PDFInfo
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- CA2589566A1 CA2589566A1 CA 2589566 CA2589566A CA2589566A1 CA 2589566 A1 CA2589566 A1 CA 2589566A1 CA 2589566 CA2589566 CA 2589566 CA 2589566 A CA2589566 A CA 2589566A CA 2589566 A1 CA2589566 A1 CA 2589566A1
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- gas
- oxygen
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- injecting
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- Polysaccharides And Polysaccharide Derivatives (AREA)
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Abstract
A method for removal of pollutants from a pulping process byproduct liquor, the method comprising injecting an oxygen-containing gas into said liquor and condensing the water vapor from the stripping gas so as to produce a condensate comprising pollutants.
Claims (20)
1. A method useful in a pulping process that produces a byproduct liquor, said method comprising the steps of:
a) determining the relationship between the amount of oxygen-containing gas injected into a reactor containing the byproduct liquor or the amount of stripping steam generated in said reactor and the amount of methanol generated in said reactor;
b) injecting oxygen-containing gas into said reactor comprising the byproduct liquor, such that said injecting results in both a further concentrated liquor and a stripping gas, said stripping gas comprising both water vapor and methanol;
c) stopping said injecting of said oxygen-containing gas at a point of required conversion of the sulfides when: (i) continued injection of said oxygen-containing gas results in methanol production at a faster rate than it can be removed by said stripping gas, or (ii) both at a point that is at or after the point of required conversion of the sulfides and prior to a point at which said oxygen-containing gas reacts to form methanol at a faster rate than is removed by said stripping gas; and d) separating said stripping gas from said further concentrated liquor.
a) determining the relationship between the amount of oxygen-containing gas injected into a reactor containing the byproduct liquor or the amount of stripping steam generated in said reactor and the amount of methanol generated in said reactor;
b) injecting oxygen-containing gas into said reactor comprising the byproduct liquor, such that said injecting results in both a further concentrated liquor and a stripping gas, said stripping gas comprising both water vapor and methanol;
c) stopping said injecting of said oxygen-containing gas at a point of required conversion of the sulfides when: (i) continued injection of said oxygen-containing gas results in methanol production at a faster rate than it can be removed by said stripping gas, or (ii) both at a point that is at or after the point of required conversion of the sulfides and prior to a point at which said oxygen-containing gas reacts to form methanol at a faster rate than is removed by said stripping gas; and d) separating said stripping gas from said further concentrated liquor.
2. The method according to claim 1 further comprising:
e) condensing said water vapor from said stripping gas so as to produce a condensate comprising said methanol.
e) condensing said water vapor from said stripping gas so as to produce a condensate comprising said methanol.
3. The method according to claim 1 wherein after said step (c) is the additional step of injecting a second oxygen-containing gas into said reactor comprising the byproduct liquor, such that said injecting results in both a further concentrated liquor and a second stripping gas, said second stripping gas comprising both water vapor and methanol.
4. The method according to claim 1 wherein after said step (c) is the additional step of injecting a non-oxidative gas into said reactor comprising the byproduct liquor, such that said injecting results in both a further concentrated liquor and a second stripping gas, said second stripping gas comprising both water vapor and methanol.
5. The method according to claim 1 wherein after step (d), steps (a), (b), (c) and (d) are repeated for a second reactor downstream of said first reactor into which said further concentrated liquor is fed.
6. The method according to claim 5 wherein for said repeated steps (a), (b), and (c) for said second reactor, a second oxygen-containing gas is injected.
7. The method according to claim 1 further comprising the steps of:
e) feeding said further concentrated liquor into a second reactor; and f) Injecting a non-oxidative gas into said second reactor.
e) feeding said further concentrated liquor into a second reactor; and f) Injecting a non-oxidative gas into said second reactor.
8. The method according to claim 4 wherein said non-oxidative gas is selected from the group of steam and an inert gas.
9. The method of Claim 1 wherein said oxygen-containing gas is air.
10. The method of Claim 1 wherein said oxygen-containing gas comprises at least 70% (v/v) oxygen.
11. The method of Claim 1 wherein the oxygen-containing gas comprises an inert gas at a concentration of 1% to 40% v/v.
12. The method of Claim 1 wherein subsequent to step (c) the liquor is processed in a flash tank so as to produce a further concentrated liquor and both water vapor and methanol.
13. A method of Claim 1 wherein the oxygen-containing gas in step (b) is the oxygen-richer gas, and wherein at a time prior to step (b), there is a step comprising injecting an oxygen-containing gas into said concentrated liquor, said gas being the oxygen-poorer gas by virtue of the fact that it contains a lower percentage of oxygen than the oxygen-richer gas does.
14. A method of Claim 13 wherein the oxygen-poorer gas is air.
15. A method of Claim 1 which further comprises combining, with new byproduct liquor that has not yet been processed through steps (b) and (c), at least a portion of the further concentrated liquor so as create a mixture of said new byproduct liquor and said portion of further concentrated liquor and, subsequent to said combining, processing at least a portion of said mixture through the steps (b) (c) and (d).
16. A method of claim 1 wherein step (d) occurs at a pressure of greater than bar(g).
17. A method of Claim 1 which further comprises combining, with new byproduct liquor that has not yet been processed through steps (b) and (c), at least a portion of the further concentrated liquor so as create a mixture of said new byproduct liquor and said portion of further concentrated liquor, and processing at least a portion of said mixture through the steps (b), (c) and (d) described for a byproduct liquor, wherein step (b) is done at temperatures less than 175 °C.
18. The method of claim 17, wherein subsequent to step (d) occurs in a flash tank so as to create a cooled liquor.
19. A method of Claim 17 wherein step (b) is done at a temperature less than 150 °C.
20 A method of Claim 17 wherein step (b) takes place in a pressurized reactor operating at greater than 2.0 bar(g).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/442,043 US20060254733A1 (en) | 2001-09-24 | 2006-05-26 | Method to lower the release of hazardous air pollutants from Kraft recovery process |
| US11/442,043 | 2006-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2589566A1 true CA2589566A1 (en) | 2007-11-26 |
| CA2589566C CA2589566C (en) | 2011-01-04 |
Family
ID=38788275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2589566A Expired - Fee Related CA2589566C (en) | 2006-05-26 | 2007-05-22 | Method to lower the release of hazardous air pollutants from kraft recovery process |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BRPI0702347A (en) |
| CA (1) | CA2589566C (en) |
-
2007
- 2007-05-21 BR BRPI0702347 patent/BRPI0702347A/en not_active IP Right Cessation
- 2007-05-22 CA CA2589566A patent/CA2589566C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2589566C (en) | 2011-01-04 |
| BRPI0702347A (en) | 2008-01-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20120522 |