CN1294221A - Thermo-degradable cracking process for treating black liquid of chemical pulping - Google Patents
Thermo-degradable cracking process for treating black liquid of chemical pulping Download PDFInfo
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- CN1294221A CN1294221A CN 99123219 CN99123219A CN1294221A CN 1294221 A CN1294221 A CN 1294221A CN 99123219 CN99123219 CN 99123219 CN 99123219 A CN99123219 A CN 99123219A CN 1294221 A CN1294221 A CN 1294221A
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- black liquid
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Abstract
A thermo-degradable cracking process for treating the black liquid of chemical pulping includes loading said black liquid into degradator, introducing steam to it, reaction for a certain time, and fash evaporating to obtain inreversible black liquid with lower viscosity, which can be easily concentrated. Its advantages are low recovery cost and saving energy.
Description
The invention belongs to environmental protection technology, relate to black liquid heat drop cracking technology.
Contain cellulose in the chemical pulp black liquid, hemicellulose, silicon also have more impurity, fiber fines and heteroproteose cell.After black liquid consistency surpassed certain value, its viscosity is acute rapidly to be risen.Concentrate to black liquor vaporizing and to bring very big difficulty, evaporimeter heating element heater surface forms dirty sheet easily, and heat transfer coefficient reduces, and the evaporation benefit reduces, causing evaporating of black liquor to imitate concentration can not improve, and main cause is being interweaved and big intermolecular rubbing action between long strand in the black liquor.Concentration is not high because the evaporating of black liquor imitated, and it is low that it contains the solid content calorific capacity, and the temperature that needs in the alkali recovery furnace lower furnace portion is not easy to keep, and heavy oil or other fuel combustion supporting must be arranged, and it is very high to cause alkali to reclaim operating cost.
Purpose of the present invention is exactly to reduce the viscosity of black liquor, and makes viscosity take place irreversibly to reduce, and is convenient to black liquor vaporizing and concentrates.
The solution that realizes the object of the invention is a kind of thermo-degradable cracking process for treating black liquid of chemical pulping, is to put into black liquid in Degradator (1), feeds steam, and reaction is again by flash vessel (2) evaporation.The operating pressure of Degradator (1) is 10.23～34.13kg/cm
2, 180～240 ℃ of reaction temperatures, 30～90 minutes reaction time.
Advantage of the present invention is by the heat drop cracking reaction of black liquid being changed the chemical property of black liquid, the viscosity of black liquid being reduced, and can not reverse, when the evaporation and concentration black liquid, make evaporimeter heating element heater surface be difficult for forming dirty sheet, reduce the alkali cost recovery, energy savings.
Accompanying drawing is a process chart of the present invention.
By pipeline (4) half quantitative dense black liquid is pumped into Degradator (1), feed steam for Degradator (1) by pipeline (3), 180～240 ℃ of control temperature, operating pressure is at 10.23～34.13kg/cm
2, reacted 30～90 minutes, carry out flash distillation step by step by three grades of flash vessels (2) again, from pipeline (5) outflow is exactly the black liquid that has reduced viscosity.Facilitate next step like this and concentrate, it can handle the chemical papermaking black liquor of wood pulp and straw pulp.
Embodiment 1: the somewhere wheat straw black liquor, go into stove concentration 35%, 180 ℃ of reaction temperatures, pressure 10.23kg/cm
2, reaction time 30min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 160 | 84 | 56 | 40 | 28 | 21 | 18 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 41 | 24 | 16 | 12 | 8．5 | 6．2 | 5．5 |
Embodiment 2: the somewhere wheat straw black liquor, go into stove concentration 35%, 190 ℃ of reaction temperatures, pressure 12.80kg/cm
2, reaction time 45min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 260 | 140 | 76 | 49 | 34 | 24．5 | 18．5 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 32 | 20 | 14 | 10 | 8．0 | 6．0 | 5．3 |
Embodiment 3: the somewhere wheat straw black liquor, go into stove concentration 36%, 200 ℃ of reaction temperatures, pressure 15.85kg/cm
2, reaction time 45min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 310 | 152 | 85 | 56 | 39 | 28 | 22 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 53 | 34 | 26 | 18 | 13 | 10 | 8．0 |
Embodiment 4: the somewhere wheat straw black liquor, go into stove concentration 33%, 210 ℃ of reaction temperatures, pressure 19.55kg/cm
2, reaction time 60min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 250 | 138 | 75 | 48 | 33 | 24 | 18．5 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 28 | 16 | 12 | 10 | 8．0 | 6．1 | 5．4 |
Embodiment 5: the somewhere wheat straw black liquor, go into stove concentration 33%, 220 ℃ of reaction temperatures, pressure 23.66kg/cm
2, reaction time 60min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 260 | 142 | 79 | 50 | 35 | 25 | 19 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 42 | 28 | 16 | 12．5 | 10．2 | 8．3 | 6．5 |
Embodiment 6: the somewhere wheat straw black liquor, go into stove concentration 36%, 230 ℃ of reaction temperatures, pressure 28.53kg/cm
2, reaction time 90min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 400 | 220 | 160 | 85 | 42 | 30 | 24 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 117 | 62 | 37．5 | 26 | 17．5 | 12．8 | 10．8 |
Embodiment 7: the somewhere wheat straw black liquor, go into stove concentration 32%, 240 ℃ of reaction temperatures, pressure 34.13kg/cm
2, reaction time 90min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 352 | 180 | 75 | 46．2 | 31 | 20．5 | 16 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 32．2 | 21 | 14 | 10 | 8．0 | 6．2 | 5．0 |
Embodiment 8: somewhere reed pulp black liquor, concentration 32%, 180 ℃ of reaction temperatures, pressure 10.23kg/cm
2, reaction time 30min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 113 | 70．2 | 46 | 32 | 22．4 | 16．5 | 13．5 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 81 | 46 | 29 | 20 | 14 | 10 | 8．2 |
Embodiment 9: somewhere reed pulp black liquor, concentration 32%, 190 ℃ of reaction temperatures, pressure 12.80kg/cm
2, reaction time 45min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 115 | 71 | 46 | 32 | 23 | 16．5 | 14 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 50 | 29．1 | 18．2 | 12 | 8．6 | 6．4 | 5．0 |
Embodiment 10: somewhere reed pulp black liquor, concentration 33%, 200 ℃ of reaction temperatures, pressure 15.85kg/cm
2, reaction time 45min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 130 | 81 | 52 | 36 | 26 | 19 | 16 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 54 | 31 | 20 | 14 | 10．8 | 8．0 | 6．0 |
Embodiment 11: somewhere reed pulp black liquor, concentration 33%, 210 ℃ of reaction temperatures, pressure 19.55kg/cm
2, reaction time 60min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 160 | 86 | 51 | 36 | 25 | 18．5 | 15 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 86 | 47．2 | 25．0 | 15．0 | 10．0 | 7．2 | 5．6 |
Embodiment 12: somewhere reed pulp black liquor, concentration 35%, 220 ℃ of reaction temperatures, pressure 23.66kg/cm
2, reaction time 60min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 280 | 160 | 103 | 62 | 41．5 | 30 | 24 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 78．5 | 48．5 | 32 | 22 | 16．5 | 12．2 | 10．0 |
Embodiment 13: somewhere reed pulp black liquor, concentration 36%, 230 ℃ of reaction temperatures, pressure 28.53kg/cm
2, reaction time 90min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 290 | 165 | 104 | 63 | 42 | 30 | 25 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 68 | 45 | 30 | 20 | 15 | 11．5 | 9．0 |
Embodiment 14: somewhere reed pulp black liquor, concentration 35%, 240 ℃ of reaction temperatures, pressure 34.13kg/cm
2, reaction time 90min.
| Before the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 260 | 150 | 101 | 60 | 40 | 28 | 22 | |
| After the processing | T(℃) | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| μ(mPaS) | 60 | 38 | 24 | 14 | 10．8 | 8．0 | 6．5 |
Claims (2)
1. a thermo-degradable cracking process for treating black liquid of chemical pulping is characterized in that putting into black liquid in Degradator (1), feeds steam, and reaction is again by flash vessel (2) evaporation.
2. according to the said black liquid heat drop of claim 1 cracking technology, it is characterized in that the operating pressure of Degradator (1) is 10.23kg/cm
2～34.13kg/cm
2180～240 ℃ of reaction temperatures, 30～90 minutes reaction time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123219 CN1294221A (en) | 1999-10-30 | 1999-10-30 | Thermo-degradable cracking process for treating black liquid of chemical pulping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123219 CN1294221A (en) | 1999-10-30 | 1999-10-30 | Thermo-degradable cracking process for treating black liquid of chemical pulping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1294221A true CN1294221A (en) | 2001-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99123219 Pending CN1294221A (en) | 1999-10-30 | 1999-10-30 | Thermo-degradable cracking process for treating black liquid of chemical pulping |
Country Status (1)
| Country | Link |
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| CN (1) | CN1294221A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439267C (en) * | 2007-10-29 | 2008-12-03 | 山东泉林纸业有限责任公司 | Alkali digester and sulammonium process mixed straw pulping black liquor, alkali digester and sulammonium process mixed compression straw pulping black liquor, and preparation method thereof |
| CN101580285A (en) * | 2009-04-01 | 2009-11-18 | 兰州节能环保工程有限责任公司 | Thermal cracking device for papermaking black liquor of non-wood material |
| CN101629393B (en) * | 2009-08-20 | 2013-01-09 | 江苏华机环保设备有限责任公司 | Film-falling crystallization and evaporation process of pulping black liquor |
| CN104928963A (en) * | 2015-05-08 | 2015-09-23 | 白博 | Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid |
-
1999
- 1999-10-30 CN CN 99123219 patent/CN1294221A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439267C (en) * | 2007-10-29 | 2008-12-03 | 山东泉林纸业有限责任公司 | Alkali digester and sulammonium process mixed straw pulping black liquor, alkali digester and sulammonium process mixed compression straw pulping black liquor, and preparation method thereof |
| CN101580285A (en) * | 2009-04-01 | 2009-11-18 | 兰州节能环保工程有限责任公司 | Thermal cracking device for papermaking black liquor of non-wood material |
| CN101629393B (en) * | 2009-08-20 | 2013-01-09 | 江苏华机环保设备有限责任公司 | Film-falling crystallization and evaporation process of pulping black liquor |
| CN104928963A (en) * | 2015-05-08 | 2015-09-23 | 白博 | Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid |
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