CN104437097A - Back washing method for ceramic micro-filtration membrane for low-temperature purification combined-soda process mother liquid II - Google Patents
Back washing method for ceramic micro-filtration membrane for low-temperature purification combined-soda process mother liquid II Download PDFInfo
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- CN104437097A CN104437097A CN201410635301.1A CN201410635301A CN104437097A CN 104437097 A CN104437097 A CN 104437097A CN 201410635301 A CN201410635301 A CN 201410635301A CN 104437097 A CN104437097 A CN 104437097A
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Abstract
The invention discloses a back washing method for a ceramic micro-filtration membrane for a low-temperature purification combined-soda process mother liquid II. The back washing method comprises the following steps: when a mother liquid II in a combined-soda process is filtered by utilizing a ceramic micro-filtration membrane assembly, water insoluble matters including calcium, magnesium and sediments are attached to the ceramic micro-filtration membrane attaches, and the membrane flux is reduced by 50% of a stable value, hot AI in the combined-soda process as a back washing liquid is charged to a membrane body between a membrane core and a membrane shell of the ceramic micro-filtration membrane assembly to perform back washing on the membrane body, and during the back washing, compressed air of 0.2-0.3MPa is discontinuously charged between the membrane core and the membrane shell to aerate the hot AI. The back washing method for the ceramic micro-filtration membrane for the low-temperature purification combined-soda process mother liquid II has the following advantages that the back washing efficiency is high, and the mother liquid balance of a combined-soda process system is not influenced; furthermore, the preparation process of the complex back washing liquid can be omitted; after the back washing, the membrane flux can recover to more than 98%.
Description
Technical field
The present invention relates to membrane separation technique and field of inorganic chemical engineering, the invention particularly relates to the back-washing method with the film during water-insolubles such as calcium, magnesium, silt in female II liquid of ceramic micro filter film removal connection alkali.
Background technology
Compared with traditional separation method, some row advantages such as UF membrane has reduced investment, simple to operate, energy consumption is low, corrosion-resistant, operating flexibility is large.At present, existing people studied the method with the water-insoluble such as calcium, magnesium, silt in the technical filter connection alkali mother II of UF membrane successively, and obtained certain progress.But in these researchs, the acid solution of multiplex certain pH value carries out backwash to film, though good backwash effect can be obtained, but backwash liquor need be prepared separately, and after backwash liquor inflow system, destroy mother liquor balance, in addition, acid backwash liquor requires also higher to the pipeline of junctional membrane assembly, the material of valve.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, there is provided a kind of backwash efficiency high, and do not affect the mother liquor balance of connection alkali system, the back-washing method of the ceramic micro filter film of female II liquid of low temperature purification connection alkali of the process for preparation of loaded down with trivial details backwash liquor can also be saved in addition.
The present invention seeks to be achieved through the following technical solutions.
The back-washing method of female II liquid of low temperature purification connection alkali ceramic micro filter film used, it comprises the following steps:
When adopting mother II liquid in ceramic micro filter film component filters connection alkali production process, on ceramic micro filter film, attachment comprises the water-insoluble of calcium, magnesium, silt, make flux depression to stationary value 50% time, hot A I in connection alkali production process is passed between the film core of ceramic micro filter membrane module and putamina as backwash liquor backwash is carried out to film, during backwash, the compressed air simultaneously intermittently passing into 0.2-0.3MPa between film core and putamina carries out aeration to hot A I.
The present invention has the following advantages: backwash efficiency is high, and does not affect the mother liquor balance of connection alkali system, and can also save the process for preparation of loaded down with trivial details backwash liquor in addition, after backwash, membrane flux can return to more than 98%.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
The back-washing method of female II liquid of low temperature purification connection alkali of the present invention ceramic micro filter film used, it comprises the following steps: when adopting mother II liquid in ceramic micro filter film component filters connection alkali production process, on ceramic micro filter film, attachment comprises calcium, magnesium, silt is at interior water-insoluble, make flux depression to stationary value 50% time, hot A I in connection alkali production process is passed between the film core of ceramic micro filter membrane module and putamina as backwash liquor backwash is carried out to film, during backwash, the compressed air simultaneously intermittently passing into 0.2-0.3MPa between film core and putamina carries out aeration to hot A I, backwash effect is improved by strengthening the less turbulence of hot A I between film core and putamina.
Along with the difference of membrane aperture, backwash liquor consumption, backwash time and aeration interval also can correspondingly change, usual aperture more big reverse washing liquid consumption less, the backwash time and aeration interval shorter.Preferably every square metre of film backwash liquor consumption is 250-600L/h, and the backwash time is 15-25min, and aeration Separation control is at 5-7s.Under such guarantee membrane flux can return to the prerequisite of more than 98%, farthest reduce the consumption of backwash liquor, shorten the backwash time, alleviate as much as possible simultaneously backwash liquor when aeration to the impact of membrane module to extend its service life, thus improve continuity and the stability of economy and whole plant running.
Preferred hot A I temperature controls at 42 DEG C-45 DEG C.The temperature of this temperature and connection alkali production system hot A I self is very close, without the need to increasing complicated attemperating unit and farthest can keeping the stability of original production system; Further, at this temperature, liquid viscosity declines, and under identical gas explosion condition, the mobility of hot A I between film core and putamina strengthens, and cleaning performance is better.
Embodiment 1
Selection aperture is mother II liquid in the ceramic micro filter film component filters connection alkali production process of 0.5 μm, when attachment on ceramic micro filter film comprises the water-insoluble of calcium, magnesium, silt, make flux depression to stationary value 50% time, control to pass between the film core of ceramic micro filter membrane module and putamina at the hot A I of 42 DEG C-44 DEG C to carry out backwash to film by the temperature in connection alkali production process, during backwash, the compressed air being aided with 0.3MPa carries out aeration to hot A I, and aeration is spaced apart 5s.Every square metre of film hot A I consumption is 600L/h, and the backwash time is 25min.
After tested: after backwash, membrane flux returns to 98% of initial value.
Embodiment 2
Selection aperture is mother II liquid in the ceramic micro filter film component filters connection alkali production process of 1 μm, when attachment on ceramic micro filter film comprises the water-insoluble of calcium, magnesium, silt, make flux depression to stationary value 50% time, control to pass between the film core of ceramic micro filter membrane module and putamina at the hot A I of 43 DEG C-45 DEG C to carry out backwash to film by the temperature in connection alkali production process, during backwash, the compressed air being aided with 0.2MPa carries out aeration to hot A I, and aeration is spaced apart 7s.Every square metre of film hot A I consumption is 250L/h, and the backwash time is 15min.
After tested: after backwash, membrane flux returns to 99% of initial value.
Embodiment 3
Selection aperture is mother II liquid in the ceramic micro filter film component filters connection alkali production process of 0.5 μm, when attachment on ceramic micro filter film comprises the water-insoluble of calcium, magnesium, silt, make flux depression to stationary value 50% time, control to pass between the film core of ceramic micro filter membrane module and putamina at the hot A I of 42 DEG C-43 DEG C to carry out backwash to film by the temperature in connection alkali production process, during backwash, the compressed air being aided with 0.25MPa carries out aeration to hot A I, and aeration is spaced apart 6s.Every square metre of film hot A I consumption is 350L/h, and the backwash time is 20min.
After tested: after backwash, membrane flux returns to 98.5% of initial value.
Claims (3)
1. the back-washing method of female II liquid of low temperature purification connection alkali ceramic micro filter film used, is characterized in that it comprises the following steps:
When adopting mother II liquid in ceramic micro filter film component filters connection alkali production process, on ceramic micro filter film, attachment comprises the water-insoluble of calcium, magnesium, silt, make flux depression to stationary value 50% time, hot A I in connection alkali production process is passed between the film core of ceramic micro filter membrane module and putamina as backwash liquor backwash is carried out to film, during backwash, the compressed air simultaneously intermittently passing into 0.2-0.3MPa between film core and putamina carries out aeration to hot A I.
2. the back-washing method of female II liquid of low temperature purification connection alkali according to claim 1 ceramic micro filter film used, is characterized in that: every square metre of film backwash liquor consumption is 250-600L/h, and the backwash time is 15-25min, and aeration Separation control is at 5-7s.
3. the back-washing method of female II liquid of low temperature purification connection alkali according to claim 1 and 2 ceramic micro filter film used, is characterized in that: described hot A I temperature controls at 42 DEG C-45 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410635301.1A CN104437097B (en) | 2014-11-12 | 2014-11-12 | The back-washing method of the female II liquid of low temperature purification connection alkali ceramic micro filter film used |
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| CN201410635301.1A CN104437097B (en) | 2014-11-12 | 2014-11-12 | The back-washing method of the female II liquid of low temperature purification connection alkali ceramic micro filter film used |
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| CN104437097A true CN104437097A (en) | 2015-03-25 |
| CN104437097B CN104437097B (en) | 2016-05-04 |
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Citations (8)
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| US4957625A (en) * | 1986-08-20 | 1990-09-18 | Toshiba Ceramics Co. Ltd. | Ceramic filter modules in series with piston backwash |
| JP2000140842A (en) * | 1998-11-10 | 2000-05-23 | Ngk Insulators Ltd | Waste water treating method using ceramic filter for waste water from silicon polishing and waste water treating system |
| US6355173B1 (en) * | 1997-08-12 | 2002-03-12 | Unilever Patent Holdings Bv | Cleaning method for membranes |
| CN201777890U (en) * | 2010-08-12 | 2011-03-30 | 山东联合化工股份有限公司 | Mother liquor circulation equipment system in Hou's process |
| CN102815724A (en) * | 2012-08-24 | 2012-12-12 | 湖北双环科技股份有限公司 | Method for producing high-class product industrial ammonium chloride |
| CN102826570A (en) * | 2012-08-24 | 2012-12-19 | 湖北双环科技股份有限公司 | Method for producing electronic-grade ammonium chloride |
| CN103249707A (en) * | 2010-10-26 | 2013-08-14 | 三菱瓦斯化学株式会社 | Crossflow type filtering operation method using ceramic filter |
| CN103523802A (en) * | 2013-07-16 | 2014-01-22 | 天津滨瀚环保科技发展有限公司 | Purification method for preparing alkali mother liquor II by employing combined soda process |
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2014
- 2014-11-12 CN CN201410635301.1A patent/CN104437097B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4957625A (en) * | 1986-08-20 | 1990-09-18 | Toshiba Ceramics Co. Ltd. | Ceramic filter modules in series with piston backwash |
| US6355173B1 (en) * | 1997-08-12 | 2002-03-12 | Unilever Patent Holdings Bv | Cleaning method for membranes |
| JP2000140842A (en) * | 1998-11-10 | 2000-05-23 | Ngk Insulators Ltd | Waste water treating method using ceramic filter for waste water from silicon polishing and waste water treating system |
| CN201777890U (en) * | 2010-08-12 | 2011-03-30 | 山东联合化工股份有限公司 | Mother liquor circulation equipment system in Hou's process |
| CN103249707A (en) * | 2010-10-26 | 2013-08-14 | 三菱瓦斯化学株式会社 | Crossflow type filtering operation method using ceramic filter |
| CN102815724A (en) * | 2012-08-24 | 2012-12-12 | 湖北双环科技股份有限公司 | Method for producing high-class product industrial ammonium chloride |
| CN102826570A (en) * | 2012-08-24 | 2012-12-19 | 湖北双环科技股份有限公司 | Method for producing electronic-grade ammonium chloride |
| CN103523802A (en) * | 2013-07-16 | 2014-01-22 | 天津滨瀚环保科技发展有限公司 | Purification method for preparing alkali mother liquor II by employing combined soda process |
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Denomination of invention: Back washing method for ceramic micro-filtration membrane for low-temperature purification combined-soda process mother liquid II Effective date of registration: 20161213 Granted publication date: 20160504 Pledgee: TIANJIN BOHAI CHEMICAL INDUSTRY GROUP CO., LTD. Pledgor: Bo Huayongli chemical inc, Tianjin Registration number: 2016120000069 |
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Date of cancellation: 20180503 Granted publication date: 20160504 Pledgee: TIANJIN BOHAI CHEMICAL INDUSTRY GROUP CO., LTD. Pledgor: Bo Huayongli chemical inc, Tianjin Registration number: 2016120000069 |
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