CN104307248A - Sodium hydroxide solution treating technology applied in naphthalene production - Google Patents
Sodium hydroxide solution treating technology applied in naphthalene production Download PDFInfo
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- CN104307248A CN104307248A CN201410617692.4A CN201410617692A CN104307248A CN 104307248 A CN104307248 A CN 104307248A CN 201410617692 A CN201410617692 A CN 201410617692A CN 104307248 A CN104307248 A CN 104307248A
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Abstract
The invention discloses a sodium hydroxide solution treating technology applied in naphthalene production. The treating technology comprises the technical scheme that the sodium hydroxide solution is left to stand in a first sedimentation tank for 24-36 hours, and then, the solution enters a cyclone separator at a flow velocity of 6-10 m/s for separation and the cyclone separator operates for 20-30 min; large-particle impurities of the sodium hydroxide solution are quickly deposited to a filter screen arranged at the lower part of the cyclone separator under the action of rotational flow, so that a material filter cake is formed in the filter screen; after the filter cake reaches the prescribed value, the filter cake is cleaned; particle impurities, which are not separated under the action of the rotational flow, of the sodium hydroxide solution rotates and goes up along with the water flow and enters a second sedimentation tank to stand for 12-24 hours; later, the solution enters a centrifugal separation device for separation, wherein, after centrifugal separation treatment, if the alkali liquor still does not reach the standard, the solution is sent back to the first sedimentation tank by a centrifugal pump for further treatment. The technology has the technical advantages of high simplicity and good convenience, strong stability, good cleanness and high efficiency.
Description
Technical field
The present invention relates to NaOH liquor treating process in the production of a kind of naphthalene.
Background technology
In coal tar deep processing industry in coal chemistry field, in order to realize maximum consolidated profit, first with carrying out deep processing after the dephenolize of alkali lye NaOH, the head products such as carbolic oil, naphtalene oil and wash oil fraction are extracted for mixed fraction.After dephenolize, phenol must reduce by sodium phenolate, and raffinate is sodium carbonate (Na
2cO
3) and sodium acid carbonate (NaHCO
3), for realizing the optimization of industrial production cost, quick lime (CaO) is adopted by raffinate to be again converted into the raw material of NaOH (NaOH) as dephenolize, realize recycling of raw material, be equivalent to only consume with quick lime cheap and easy to get (CaO), thus obtain good economic benefit.But prior art is to the removal of lime mud, guaranteeing that useful NaOH (NaOH) solution obtains fully effective recovery is key problem in technology.The white liquid of causticization is used for cooking section slurrying and joins alkali, and after forming green liquor, main component is NaCO
3enter causticization reactor again together with quick lime CaO, the white liquid of reacted causticization joins alkali for cooking section slurrying after suitably processing, and completes a circulation.CaCO in the white liquid of causticization
3great on comprising the pulp quality impacts such as bamboo, cotton, wood, grass Deng impurity, and then affect end product quality.Deimpurity technique is gone to mainly contain in the white liquid of current causticization: white liquor clarifier, CD filter and white hydraulic coupling filter etc.White liquor clarifier scrubbing efficiency is low, and after white liquor clarifier process, the suspended impurity in white liquid is at more than 70mg/l; CD filter is external product, expensive, and the suspended impurity after process in white liquid is not less than 30mg/L; White hydraulic coupling filter is cloth-bag type structure, and the suspended impurity after process in white liquid is not less than 30mg/L, and needs often to change and cleaning cloth bag, and labour intensity is large, can not realize automatic control.Due to harsh conditions such as the alkali concn of the white liquid of causticization and temperature, to adopt existing technological process to there is flow process unreasonable, and scrubbing efficiency is low, and the suspended impurity after process in white liquid is high, makes pulp quality poor, and then affects the deficiencies such as end product quality.Comparatively ripe technique adopts vacuum filter to filter, and carry out clean water, reclaim NaOH (NaOH) wherein as much as possible, cause NaOH (NaOH) concentration of lye low like this, the way taking supplementary sheet alkali (solid sodium hydroxide, content about 95%) to improve concentration produces again total alkali lye and cannots be used up and arrange outward, both causes waste, contaminated environment again, to wastewater treatment operation mineralization pressure.And adopt dehydration by evaporation way to improve NaOH (NaOH) concentration of lye, and lime mud (mainly calcium carbonate CaCO3) water capacity is up to 40 ~ 50%, has both been not easy to transport, be also unfavorable for depositing, landfill is contaminated environment again.The present inventor once tested landfill test of directly being digged pit by filter lime mud out (mainly calcium carbonate CaCO3), it is not dry containing water section long-time (about half a year), form the state of similar " marshland ", be pollution sources, again " safe trap ", alkali lye slowly oozes out directly affects underground and water environment, and even air ambient.
Summary of the invention
The object of the invention is to propose NaOH liquor treating process in the production of a kind of naphthalene.
For reaching this object, the present invention by the following technical solutions:
NaOH liquor treating process in a kind of naphthalene production, it comprises caustic lye of soda first standing 24-36 hour in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, standing 12-24 hour in the second sedimentation basin is not entered by the granule foreign that cyclonic action is separated with the rising of current eddy flow in caustic lye of soda, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
This technique has easy, stable, clean, efficient technological merit.
Detailed description of the invention
Embodiment 1
Caustic lye of soda is first left standstill 24 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 12 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 2
Caustic lye of soda is first left standstill 25 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 13 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 3
Caustic lye of soda is first left standstill 26 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 14 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 4
Caustic lye of soda is first left standstill 27 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 15 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 5
Caustic lye of soda is first left standstill 28 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 20 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 6
Caustic lye of soda is first left standstill 30 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 16 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 7
Caustic lye of soda is first left standstill 32 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 22 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 8
Caustic lye of soda is first left standstill 25 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 16 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 9
Caustic lye of soda is first left standstill 34 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 22 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 10
Caustic lye of soda is first left standstill 28 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 20 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 11
Caustic lye of soda is first left standstill 31 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 15 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 12
Caustic lye of soda is first left standstill 28 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 12 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 13
Caustic lye of soda is first left standstill 30 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 12 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Embodiment 14
Caustic lye of soda is first left standstill 32 hours in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, the granule foreign be not separated by cyclonic action in caustic lye of soda rises to enter in the second sedimentation basin with current eddy flow and leaves standstill 24 hours, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
Claims (1)
1. NaOH liquor treating process in a naphthalene production, it is characterized in that, it comprises caustic lye of soda first standing 24-36 hour in the first sedimentation basin, enter in cyclone separator with flow velocity 6-10m/s subsequently and be separated, run 20-30min, in caustic lye of soda, large granular impurity deposits to rapidly in the filter screen of cyclone separator bottom setting under the effect of eddy flow; Filter screen is made to form material filter cake, filter cake is removed after filter cake reaches setting, standing 12-24 hour in the second sedimentation basin is not entered by the granule foreign that cyclonic action is separated with the rising of current eddy flow in caustic lye of soda, enter centrifugal separating device to be subsequently separated, when alkali lye does not still have up to standard after centrifuging treatment, return the first sedimentation basin by centrifugal pump foldback and continue process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410617692.4A CN104307248A (en) | 2014-11-05 | 2014-11-05 | Sodium hydroxide solution treating technology applied in naphthalene production |
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|---|---|---|---|
| CN201410617692.4A CN104307248A (en) | 2014-11-05 | 2014-11-05 | Sodium hydroxide solution treating technology applied in naphthalene production |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811706A (en) * | 2009-12-17 | 2010-08-25 | 曲靖众一精细化工股份有限公司 | Causticized alkali liquor efficient separation method |
| CN102078726A (en) * | 2010-12-14 | 2011-06-01 | 吉林化纤集团有限责任公司 | Causticized muddy white liquid purifying technique |
| CN102125785A (en) * | 2010-12-14 | 2011-07-20 | 东北电力大学 | Multifunctional combined type purification device |
| WO2013050654A1 (en) * | 2011-10-04 | 2013-04-11 | Andritz Oy | Pressure filter |
-
2014
- 2014-11-05 CN CN201410617692.4A patent/CN104307248A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811706A (en) * | 2009-12-17 | 2010-08-25 | 曲靖众一精细化工股份有限公司 | Causticized alkali liquor efficient separation method |
| CN102078726A (en) * | 2010-12-14 | 2011-06-01 | 吉林化纤集团有限责任公司 | Causticized muddy white liquid purifying technique |
| CN102125785A (en) * | 2010-12-14 | 2011-07-20 | 东北电力大学 | Multifunctional combined type purification device |
| WO2013050654A1 (en) * | 2011-10-04 | 2013-04-11 | Andritz Oy | Pressure filter |
Non-Patent Citations (4)
| Title |
|---|
| 万晖等: "《开关量控制技术及其应用》", 31 May 2009 * |
| 哈尔滨建筑工程学院: "《排水工程下 第2版》", 31 July 1987 * |
| 王金梅等: "《水污染控制技术》", 30 April 2004 * |
| 韩金梅: "《制浆工艺与技术》", 31 January 2005 * |
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Application publication date: 20150128 |