CN1792832A - Treating waste water containing salt of epoxy resin and recovering salt thereof - Google Patents
Treating waste water containing salt of epoxy resin and recovering salt thereof Download PDFInfo
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- CN1792832A CN1792832A CN 200510122825 CN200510122825A CN1792832A CN 1792832 A CN1792832 A CN 1792832A CN 200510122825 CN200510122825 CN 200510122825 CN 200510122825 A CN200510122825 A CN 200510122825A CN 1792832 A CN1792832 A CN 1792832A
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Abstract
A process for treating the salt contained sewage generated by preparing epoxy resin and recovering salt includes such steps as adding benzene-series compound and/or methyisobutyl ketone as extractant, separating upper-layer organic phase and returning it back to production line, adding acidic compound to lower-layer sewage to regulate pH=5-9, separating lower-layer waste from upper-layer liquid, concentrating the liquid, crystallizing and drying to obtain finished salt.
Description
Technical field
The present invention relates to a kind of Resins, epoxy brine waste and handle and reclaim the method for salt.
Background technology
In Resins, epoxy is produced, can produce the high density brine waste, for example in the soft resin waste water salt concn up to 25%.Brine waste is because of CL
-Concentration is higher, and (CODCr is about 11000, CL
-Be about 60000～12000mg/L), not only be difficult to biochemical treatment, (the biochemical treatment upper limit generally is: CODCr＜2000, CL
-＜15000mg/L), and composition is complicated, contains oily organism, alkali, salt etc., crowding phenomenon, and prior art has such method of wastewater treatment:
" waste water treatment engineering " (1998 April the 1st edition, Chemical Industry Press), separating continues adopts after the dilution routinely method for the treatment of city waste water to handle.This method not only floor space is big, the cost for wastewater treatment height; And owing to contain more molecular weight bigger oily organism, alkali and salt in the waste water, conventional treatment method is difficult to thoroughly remove.
Concentrate burning method, because of containing a large amount of Na in the epoxy resin waste-water
-, Cl
-, OH
-, in incinerator, can occur with the melting salt form, not only stop up incinerator easily, and the processing cost costliness, practicality and economy are relatively poor.
The disclosed high concentration salts method for reclaiming waste water of Chinese patent CN92113481.9, technological process is: handled, evaporated by crystallizer earlier, make the salt solution supersaturation and separate out crystal, carry out solid-liquid separation then, obtain being attached with organic salt, heating makes the organism evaporation on surface, inspire the reaction (comprising vulcanization reaction) of separating estranged, organic carbon is destroyed, become the carbon slag, and then water-soluble, make after filtration that salt solution separates with the carbon slag, purifying.Because without the separation of organic phase, and do not carry out impurity elimination before concentrating with in concentrating, thereby gained salt composition complexity, poor practicability can cause vaporization efficiency to reduce when concentrated, shorten the work-ing life of vaporizer.
Chinese patent CN99114064.8 discloses a kind of Resins, epoxy height waste water closed circulation processing technique, earlier epoxy resin high-concentration waste water is carried out separating of oil phase and water, tells first by product---the oily organism; The waste water and clear liquid condensing crystal obtains crystallization magma and water of condensation, and water of condensation is as the bath water of resin finished product; Crystallization slurry separates again, obtains crystal salt (second by product) and crystalline mother solution; Extraction partial crystallization mother liquor is as finished product liquid caustic soda (the 3rd by product), and all the other crystalline mother solutions mix with the next batch epoxy resin waste-water, returns the first step and separates, thereby constitute the closed cycle circle.Yet this method pre-treatment (comprise and remove organism and inorganics) effect is undesirable, causes vaporization efficiency and serviceability poor, is unfavorable for long-time running; Secondly, gained salt poor quality can not obtain the Industrial Salt of higher degree, deficiency in economic performance, steam consumption big (average 2 tons of left and right sides steam/ton waste water).
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of recovery purity salt height is provided, steam consumption is few, and is reliable, the processing of good in economic efficiency Resins, epoxy brine waste and the recovery of salt.
The object of the invention realizes, mainly by add extraction agent in waste water organic phase is separated, and then adopts the acid neutralization to remove alkaline matter and aldehydes matter, removes insoluble impurities by sedimentation again, obtains resultant product salt.Specifically, the processing of Resins, epoxy brine waste of the present invention and the recovery of salt, it is characterized in that in brine waste, adding benzene series thing and/or methyl iso-butyl ketone (MIBK) extraction agent, the extracting and separating upper organic phase is returned Resins, epoxy production, lower floor's waste water adds acidic substance earlier and is neutralized to PH5-9, tell lower floor's refuse, upper strata liquid is through concentrated, crystallization, the dry finished product salt that gets.
The present invention adds extraction agent, its effect is to improve the organic phase separating power, accelerate velocity of separation, make it to be removed as far as possible, prevent from when subsequent evaporation, to be attached to vaporizer, alleviate vaporizer is stopped up, and can effectively improve the vaporizer heat transfer coefficient, improve the evaporation separation efficiency, reduce separation costs, also strengthened operational reliability simultaneously.Said benzene series thing extraction agent is such as but not limited to benzene,toluene,xylene etc.The extraction agent add-on is preferably the 1%-10%wt of wastewater flow rate.
Add acidic substance, effect be with waste water in alkaline matter (for example caustic soda) neutralization back generate salt (for example sodium-chlor), and with under alkaline condition, be dissolved phenol sodium reaction, generating phenol (as dihydroxyphenyl propane, Bisphenol F) separates out and separated removing, the salt that produces then is dissolved in the waste water, can improve the unicity of finished product salt like this.Among the present invention and use acidic substance, all can use as long as can produce the acidic substance of neutralization reaction, can be organic acid, also can be mineral acid, from economic considerations, better adopt mineral acid, especially hydrochloric acid adopts hydrochloric acid to also help the purity that keeps the finished product.Adding acid neutralization is more preferably and is neutralized to PH6-8.
Reclaim purity salt for further improving, a kind of better is to add coagulating agent and flocculation agent after neutralization, with raising impurity separating power, and the impurity settling velocity, reduce the impurity elimination treatment time.
The present invention concentrates, and is to make in the saline solns to salt out, and can adopt known concentration method, and the present invention thinks through test and a kind of better employing multiple-effect evaporation mode helps reducing concentrated cost.For obtaining to reclaim salt higher purity is arranged, a kind of better is in the evaporation flow process strainer to be set, liquid filtration to vaporization cycle, left in minute impurities in the liquid with further filtering, not only help improving vaporization efficiency, and the device fouling that can avoid evaporating, improve vaporizer work-ing life, and can obtain high purity and reclaim salt.
The inventive method is removed organism owing to add extraction agent earlier, removes alkaline matter and phenols is separated out with the acid neutralization again, reclaims salt by precipitate and separate at last, and adopt filtration, purification in evaporating concentration process.Existing treatment process has: pre-treatment can obtain single product salt, the purity that reclaims salt improves (seeing Table one) greatly, solved the pollution problem of abraum salt simultaneously, in addition owing to (liquid filtration in the evaporation) before evaporation and in the evaporation removes impurity, thereby the vaporization efficiency of vaporizer is improved, ton waste water only needs 0.5 ton of left and right sides steam, production cost is reduced greatly, and the work-ing life that can improve vaporizer, simultaneously can guarantee the pure of product separation again, wastewater treatment good in economic efficiency (seeing Table two).
Table one reclaims salt mass analysis table
| Index | The top grade product | First grade | Seconds | Salable product | The experiment gained |
| Sodium-chlor % 〉= | 95.5 | 94.0 | 92.0 | 89.5 | 98.4 |
| Moisture content %≤ | 3.30 | 4.20 | 6.00 | 7.45 | 1.12 |
| Water-insoluble %≤ | 0.2 | 0.3 | 0.4 | 0.5 | 0.04 |
| Water-soluble impurity %≤ | 1.00 | 1.50 | 1.70 | 2.60 | 0.36 |
Table two economic benefit table
| Total amount (ton) | Unit price (unit/ton) | Total price (ten thousand yuan) | |
| Coagulating agent | 60 | 3000 | 18 |
| Hydrochloric acid | 820 | 350 | 28.7 |
| Steam | 28000 | 100 | 280 |
| Total cost | 326 | ||
| Finished product salt is received salt | 4900 | 700 | 343 |
| Comprehensive benefit | Ten thousand yuan of comprehensive benefits=finished product salt income-total cost=343-327=17 | ||
Illustrate: go up table for pressing 10000 tons/year of liquid resins, 10000 tons/year of solid epoxies, produce 35000 tons/year of high salt concentration waste water altogether approximately, by the recyclable about 4900 tons of finished product Industrial Salts of the inventive method (calculating) with the top grade product.
Below in conjunction with two embodiments, further specify the present invention.
Embodiment
Molecular weight and 400g low-molecular-weight epoxy resin composite waste among the embodiment 1:600g add 50g toluene and extract, through stir, leave standstill, layering.Tell upper strata 51g organic phase and return the Resins, epoxy production technique.Lower floor waste water adds the neutralization of 18g concentrated hydrochloric acid, and PH equals 7 during end, adds the 1g flocculation agent, stirs, leaves standstill, layering.Tell the refuse 30g of lower floor, pressing filtering liquid returns the liquid that next time flocculates; Supernatant liquid 987g after filtering, enters three-effect evaporation and condensation, during evaporation concentration the circulation liquid phase is filtered.Return Resins, epoxy production behind the vapor condensation that steams, obtain solid content and be 30% salt slurry 559g, get wet salt 239g through centrifuge dehydration, drying, finished product salt 167g.
Molecular weight and 300g low-molecular-weight epoxy resin composite waste among the embodiment 2:700g add 20g toluene and 20g methyl iso-butyl ketone (MIBK) mixed extractant and extract, through stir, leave standstill, layering.Tell upper strata 41g organic phase and return the Resins, epoxy production technique.Lower floor waste water adds the neutralization of 16g concentrated hydrochloric acid, and PH equals 7.4 during end, adds the 0.9g flocculation agent, stirs, leaves standstill, layering.Tell the refuse 28g of lower floor, pressing filtering liquid returns the liquid that next time flocculates; Supernatant liquid 956.1g enters three-effect evaporation and condensation after filtering through filter, during evaporation concentration the circulation liquid phase is filtered.Return Resins, epoxy production behind the vapor condensation that steams, it is 33% salt slurry 521g that evaporation obtains solid content, gets wet salt 227g through centrifuge dehydration, drying, finished product salt 162g.
Claims (7)
1, the recovery of the processing of Resins, epoxy brine waste and salt, it is characterized in that in brine waste, adding benzene series thing and/or methyl iso-butyl ketone (MIBK) extraction agent, the extracting and separating upper organic phase is returned Resins, epoxy production, lower floor's waste water adds acidic substance earlier and is neutralized to PH5-9, tell lower floor's refuse, upper strata liquid is through concentrated, crystallization, the dry finished product salt that gets.
2,, it is characterized in that the extraction agent add-on is the 1%-10%wt of wastewater flow rate according to the processing of the described Resins, epoxy brine waste of claim 1 and the recovery of salt.
3,, it is characterized in that lower floor's waste water adds acidic substance and is neutralized to PH6-8 according to the processing of the described Resins, epoxy brine waste of claim 1 and the recovery of salt.
4,, it is characterized in that said acidic substance are hydrochloric acid according to the processing of claim 1 or 3 described Resins, epoxy brine wastes and the recovery of salt.
5,, it is characterized in that being added with coagulating agent and flocculation agent after the neutralization according to the processing of the described Resins, epoxy brine waste of claim 1 and the recovery of salt.
6,, it is characterized in that said simmer down to evaporation concentration according to the processing of the described Resins, epoxy brine waste of claim 1 and the recovery of salt.
7,, it is characterized in that in the evaporative process liquid phase circulation loop strainer being arranged according to the processing of the described Resins, epoxy brine waste of claim 6 and the recovery of salt.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101228251A CN100347104C (en) | 2005-12-05 | 2005-12-05 | Treating waste water containing salt of epoxy resin and recovering salt thereof |
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|---|---|---|---|
| CNB2005101228251A CN100347104C (en) | 2005-12-05 | 2005-12-05 | Treating waste water containing salt of epoxy resin and recovering salt thereof |
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| CN1792832A true CN1792832A (en) | 2006-06-28 |
| CN100347104C CN100347104C (en) | 2007-11-07 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351268A (en) * | 2011-06-28 | 2012-02-15 | 东华大学 | Method of recycling inorganic salt in dyeing wastewater |
| CN102408580A (en) * | 2011-09-15 | 2012-04-11 | 上海交通大学 | Preparation method for epoxy resin porous material |
| CN102674401A (en) * | 2012-05-03 | 2012-09-19 | 慈溪市附海镇思维工业产品工作设计室 | Preparation method of industrial salt |
| US8466257B2 (en) | 2008-02-22 | 2013-06-18 | Dow Global Technologies Llc | Process and apparatus for purifying solid salt compositions |
| CN105712580A (en) * | 2016-03-07 | 2016-06-29 | 中蓝连海设计研究院 | Reduction treatment device and method for epoxy resin wastewater evaporative desalination mother liquor |
| CN106939086A (en) * | 2017-04-26 | 2017-07-11 | 江苏扬农锦湖化工有限公司 | A kind of purification process of aged resin |
| CN108341536A (en) * | 2018-02-12 | 2018-07-31 | 胡茂宅 | A kind of processing method of epoxy resin production waste-water |
| CN109824191A (en) * | 2018-12-12 | 2019-05-31 | 张家港衡业特种树脂有限公司 | Glycerol is extracted in haline water in epoxy resin production process |
| CN110228828A (en) * | 2018-03-05 | 2019-09-13 | 南通星辰合成材料有限公司 | A kind of epoxy resin high-salt wastewater concentration purification system and its method of purification |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU971805A1 (en) * | 1981-01-05 | 1982-11-07 | Предприятие П/Я В-2304 | Process for purifying effluents from epoxy resin production |
| US4560812A (en) * | 1984-12-10 | 1985-12-24 | Shell Oil Company | Recovery of glycerine from saline waters |
| GB2260975B (en) * | 1991-10-28 | 1995-07-12 | Chang Shih Chang | The process to recover salt from brine waste water |
| CN1124231C (en) * | 1999-02-09 | 2003-10-15 | 无锡轻工大学 | Closed cycle process for treating epoxy resin high-concentration wastewater |
-
2005
- 2005-12-05 CN CNB2005101228251A patent/CN100347104C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8466257B2 (en) | 2008-02-22 | 2013-06-18 | Dow Global Technologies Llc | Process and apparatus for purifying solid salt compositions |
| CN102351268A (en) * | 2011-06-28 | 2012-02-15 | 东华大学 | Method of recycling inorganic salt in dyeing wastewater |
| CN102408580A (en) * | 2011-09-15 | 2012-04-11 | 上海交通大学 | Preparation method for epoxy resin porous material |
| CN102674401A (en) * | 2012-05-03 | 2012-09-19 | 慈溪市附海镇思维工业产品工作设计室 | Preparation method of industrial salt |
| CN102674401B (en) * | 2012-05-03 | 2014-02-26 | 慈溪市附海镇思维工业产品工作设计室 | Preparation method of industrial salt |
| CN105712580A (en) * | 2016-03-07 | 2016-06-29 | 中蓝连海设计研究院 | Reduction treatment device and method for epoxy resin wastewater evaporative desalination mother liquor |
| CN106939086A (en) * | 2017-04-26 | 2017-07-11 | 江苏扬农锦湖化工有限公司 | A kind of purification process of aged resin |
| CN106939086B (en) * | 2017-04-26 | 2019-09-13 | 江苏扬农锦湖化工有限公司 | A kind of purification process of aged resin |
| CN108341536A (en) * | 2018-02-12 | 2018-07-31 | 胡茂宅 | A kind of processing method of epoxy resin production waste-water |
| CN110228828A (en) * | 2018-03-05 | 2019-09-13 | 南通星辰合成材料有限公司 | A kind of epoxy resin high-salt wastewater concentration purification system and its method of purification |
| CN109824191A (en) * | 2018-12-12 | 2019-05-31 | 张家港衡业特种树脂有限公司 | Glycerol is extracted in haline water in epoxy resin production process |
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| CN100347104C (en) | 2007-11-07 |
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Assignee: Jiangsu Sanmu Chemical Industry Co., Ltd. Assignor: Jiangsu Sanmu Group Co., Ltd. Contract fulfillment period: 2007.12.28 to 2017.12.28 contract change Contract record no.: 2008320000422 Denomination of invention: Treating waste water containing salt of epoxy resin and recovering salt thereof Granted publication date: 20071107 License type: Exclusive license Record date: 2008.9.26 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.12.28 TO 2017.12.28 Name of requester: JIANGSU MIKI CHEMICAL CO., LTD. Effective date: 20080926 |
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