CN114314984A - Light alkali recycling device - Google Patents
Light alkali recycling device Download PDFInfo
- Publication number
- CN114314984A CN114314984A CN202111589926.5A CN202111589926A CN114314984A CN 114314984 A CN114314984 A CN 114314984A CN 202111589926 A CN202111589926 A CN 202111589926A CN 114314984 A CN114314984 A CN 114314984A
- Authority
- CN
- China
- Prior art keywords
- alkali
- storage tank
- tank
- causticizing
- evaporator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Physical Water Treatments (AREA)
Abstract
The invention discloses a light alkali recycling device, which comprises a light alkali storage tank, wherein the light alkali storage tank is connected with a floating device, and a circulation loop is formed among the floating device, a spray evaporator and a capacity expansion evaporator; the solvent storage tank and the expansion evaporator are respectively connected with the causticizing device and are used for leading alkali liquor with required concentration to carry out causticizing reaction in the causticizing device; the causticizing device is connected with the air floatation tank and is used for carrying out air floatation treatment on the precipitated alkaline water; the air floatation tank is connected with an acid liquor storage tank and used for neutralizing alkali liquor in the air floatation tank, and the air floatation tank is connected with a filter pressing device and used for recovering materials. On the premise of not using consumables such as an ultrafiltration membrane, active carbon and the like, the device can still achieve the aim of realizing sewage treatment, thereby reducing the cost and the difficulty of sewage treatment; the spray evaporator is matched with the causticizing device and the air flotation device, and the recovery of PTA, PET and liquid caustic soda is realized on the basis of maximally treating impurities.
Description
Technical Field
The invention relates to a device for treating liquid after dyeing and finishing, in particular to a light alkali recycling device.
Background
PTA is known under the chemical name terephthalic acid, in the form of a white powder, and reacts with EG (ethylene glycol) to produce PET (polyethylene terephthalate). Because PET is not alkali-resistant, PET can be degraded in an alkali solution to generate PET oligomer and PTA, when the PET fabric is processed in a dyeing and finishing process, in order to increase the soft hand feeling of the PET fabric, the PET fabric is usually treated by NaOH (caustic soda) in a production process, the stripped PET oligomer and PTA are discharged into a sewage treatment station along with waste alkali solution, COD (chemical oxygen demand) of sewage is very high due to the existence of PTA and PET oligomer, and meanwhile, the PTA and PET oligomer are very difficult to degrade, so that the cost of sewage treatment is higher and the emission is increased.
Patent CN201420168538.9 discloses a dyeing and finishing weak alkali recycle device, and the device adopts consumptive materials such as milipore filter and active carbon, has increased the treatment cost, does not carry out recycle to PTA and PET oligomer simultaneously.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a light alkali recycling device with low cost and low treatment difficulty.
The technical scheme is as follows: the light alkali recycling device comprises a light alkali storage tank, wherein the light alkali storage tank is connected with a floating device, and a circulation loop is formed among the floating device, a spray evaporator and a capacity expansion evaporator; the solvent storage tank and the expansion evaporator are respectively connected with the causticizing device and are used for leading alkali liquor with required concentration to carry out causticizing reaction in the causticizing device; the causticizing device is connected with the air floatation tank and is used for carrying out air floatation treatment on the precipitated alkaline water; the air floatation tank is connected with an acid liquor storage tank and used for neutralizing alkali liquor in the air floatation tank, and the air floatation tank is connected with a filter pressing device and used for recovering materials.
And a grey water separator for separating impurities is arranged between the expansion evaporator and the causticization barrel.
Wherein, be equipped with the first storage tank that is used for storing evaporation back alkali lye so that control alkali lye delivery capacity between spraying evaporator and the dilatation evaporator.
And a second storage tank for storing neutralized liquid so as to control the liquid output is arranged between the air floatation tank and the filter pressing device.
Wherein, the causticization device is connected with the recovery storage tank and is used for recycling the alkali liquor.
And a filter for primarily separating impurities from the alkali liquor in the dilute alkali storage tank is connected between the dilute alkali storage tank and the spray evaporator.
Wherein, the spray evaporator is connected with the condenser and the condensation pool and is used for condensing and recycling the steam.
And the condenser of the expansion evaporator and the condensation tank are connected and used for condensing and recycling the steam.
Wherein a filter is connected between the weak base storage tank and the spray evaporator.
And flow control valves for controlling the flow are respectively arranged between the expansion evaporator and the first storage tank and between the filter pressing device and the second storage tank.
Has the advantages that: compared with the prior art, the invention has the following remarkable effects: 1. on the premise of not using consumables such as an ultrafiltration membrane, active carbon and the like, the device can still achieve the aim of realizing sewage treatment, thereby reducing the cost and the difficulty of sewage treatment; 2. a circulation loop is formed among the floating device, the spray evaporator and the expansion evaporator, so that the impurity treatment is more sufficient; 3. the spray evaporator is matched with the causticizing device and the air flotation device, and the recovery and utilization of PTA, PET and liquid caustic soda are realized on the basis of treating impurities to the maximum extent; 4. the recovered PTA can be used for producing plasticizer.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings.
As shown in fig. 1, the light alkali recycling device provided by the present invention comprises a light alkali storage tank, wherein the light alkali storage tank is sequentially connected to a rotary filter, a floating device, a spray evaporator, a first storage tank, and a flash evaporator; the expansion evaporator is connected with the floating device, so that a circulation loop is formed among the floating device, the spray evaporator, the first storage tank and the expansion evaporator; and a flow control valve is arranged between the expansion evaporator and the first storage tank and is used for controlling the flow of the alkali liquor entering the expansion evaporator.
The spray evaporator and the expansion evaporator are respectively connected with the condenser and the condensation tank and are used for condensing and recycling the steam. The expansion evaporator is connected with the ash-water separator and the causticizing device in sequence; the grey-water separator is connected with the sewage disposal pool and is used for discharging the separated sewage. The causticizing device is connected with the solvent storage tank and is used for carrying out causticizing reaction in the causticizing device, wherein the solvent storage tank stores lime water, and the lime water and alkali liquor separated by the ash-water separator carry out causticizing reaction in the causticizing device; the causticizing device is connected with the recovery storage tank, and the alkali liquor after the causticizing reaction can be recycled, for example, the alkali liquor can be sent into a new alkali storage tank and the proportion of the alkali liquor can be regulated and controlled by the alkali distribution device to obtain the alkali liquor with the required concentration.
The outlet of the causticizing device is connected with an air floatation tank and is used for carrying out air floatation treatment and impurity separation on the precipitated alkaline water; an inlet of the air floatation tank is connected with the acid liquor storage tank, the acid liquor storage tank is used for conveying acid liquor to the air floatation tank, an outlet of the air floatation tank is sequentially connected with the second storage tank and the filter pressing device, and a flow control valve is arranged between the filter pressing device and the second storage tank and used for controlling the flow of neutralized alkali liquor conveyed into the filter pressing device; the filter pressing device is used for filter pressing the useful substances in the neutralized alkali liquor for recycling. The filter press apparatus of this embodiment is a filter press.
The working process is as follows:
discharging liquid caustic soda used in a workshop to a weak caustic soda ground pool, temporarily storing weak caustic soda water in a primary container, performing negative pressure water absorption through a siphon tank, and pumping the water to a weak caustic soda storage tank by using a 3# caustic soda pump. The method comprises the following steps of pumping 4# alkali to a rotary filter, then flowing into a floating device, pumping air pressure into the floating device by using a 5# circulating pump, treating a part of light alkali impurities through the rotary filter and the floating device, then flowing to a spray evaporator through a pipeline for atomization, precipitating the light alkali impurities to the bottom of the evaporator, and discharging light water mist into liquid after passing through a condenser and then into a condensation tank; the alkaline water precipitated at the bottom of the spray evaporator is pumped to a first storage tank through a No. 6 pump for precipitation. Sending the concentrated alkali water into a flash evaporator through a 9# pump for circulation, then carrying out circulating high-temperature evaporation through a 10# pump until the concentrated alkali water reaches the required concentration, and discharging the distilled concentrated alkali water into a grey-water separator for separating impurities. The concentrated alkali after impurity separation is pumped into a causticizing device through a No. 11 pump for stirring. And feeding the lime water in the solvent storage tank into a causticizing device through a 12# pump to be stirred and precipitated with concentrated alkali, pumping the precipitated concentrated alkali back to the storage tank through a 16# pump, and putting the precipitated concentrated alkali into a new alkali tank for proportioning after secondary precipitation.
And (3) sending the alkaline water left and precipitated in the causticizing barrel into an air floatation tank through a No. 14 pump for air floatation treatment and impurity separation.
The acid liquor storage tank adds acid liquor into the air flotation tank through a No. 13 pump, the acid liquor and liquid alkali impurities discharged from the causticization device are subjected to acid-dilute reaction, then the acid liquor flows into the second storage tank for storage, the acid liquor is pumped to the plate-and-frame filter pressing device through a No. 18 pump for filter pressing, the PTA and PET are transported outside after filter pressing, and sewage flows to a sewage station.
And in addition, fresh liquid caustic soda which is not used in a workshop is placed into a caustic soda unloading storage tank, negative pressure water absorption is carried out through a siphon tank, and the fresh liquid caustic soda is pumped to a fresh caustic soda storage tank by a No. 1 caustic soda pump. The novel alkali land pool is filled with the pneumatic valve, the alkali concentration is stored and prepared for use, tap water is added into the novel alkali land pool through liquid level control, the tap water is pumped and circulated to the automatic alkali preparation device through the 2# circulating alkali pump, and after the alkali concentration required to be used in a workshop is controlled through a touch screen and is automatically adjusted, the tap water is pumped to a high-level tank through the 2# alkali pump for storage, and the high-level tank and the low-level tank are supplied to the workshop for use through high-level pressure difference and low-level pressure difference. The concentrated alkali from the causticizing device is sent to a new alkali pool for reuse.
Claims (9)
1. A light alkali recycling device comprises a light alkali storage tank and is characterized in that the light alkali storage tank is connected with a floating device, and a circulation loop is formed among the floating device, a spray evaporator and a capacity expansion evaporator; the solvent storage tank and the expansion evaporator are respectively connected with the causticizing device and are used for leading alkali liquor with required concentration to carry out causticizing reaction in the causticizing device; the causticizing device is connected with the air floatation tank and is used for carrying out air floatation treatment on the precipitated alkaline water; the air floatation tank is connected with an acid liquor storage tank and used for neutralizing alkali liquor in the air floatation tank, and the air floatation tank is connected with a filter pressing device and used for recovering materials.
2. The weak alkali recycling device according to claim 1, wherein a grey water separator for separating impurities is disposed between the flash evaporator and the causticizing barrel.
3. The weak alkali recycling device according to claim 1, wherein a first storage tank for storing evaporated alkali solution is arranged between the spray evaporator and the expansion evaporator so as to control the conveying amount of the alkali solution.
4. The weak alkali recycling device according to claim 1, wherein a second storage tank for storing neutralized liquid so as to control the liquid output is arranged between the air flotation tank and the filter pressing device.
5. The weak alkali recycling device according to claim 1, wherein the causticizing device is connected to a recycling storage tank for recycling alkali liquor.
6. The weak alkali recycling device according to claim 1, wherein a filter for preliminarily separating impurities from the alkali liquor in the weak alkali storage tank is connected between the weak alkali storage tank and the spray evaporator.
7. The weak base recycling device according to claim 1, wherein the spray evaporator is connected with the condenser and the condensation pool for condensing and recycling the steam.
8. The weak base recycling device according to claim 1, wherein the flash evaporator condenser and the condensation tank are connected for condensing and recycling steam.
9. The weak alkali recycling device according to claim 1, wherein a flow control valve for controlling the flow rate is respectively disposed between the flash evaporator and the first storage tank, and between the pressure filtration device and the second storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589926.5A CN114314984A (en) | 2021-12-23 | 2021-12-23 | Light alkali recycling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589926.5A CN114314984A (en) | 2021-12-23 | 2021-12-23 | Light alkali recycling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114314984A true CN114314984A (en) | 2022-04-12 |
Family
ID=81054987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111589926.5A Pending CN114314984A (en) | 2021-12-23 | 2021-12-23 | Light alkali recycling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114314984A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB285933A (en) * | 1926-10-18 | 1928-02-20 | William Barrs | Improvements in or relating to the treatment of waste liquors of paper manufacture for the recovery of caustic alkali therein |
| US4627888A (en) * | 1983-02-23 | 1986-12-09 | Enso-Gutzeit Oy | Causticizing method |
| CN101585618A (en) * | 2009-06-18 | 2009-11-25 | 俞国兴 | Alkali recovery device of jean mercerizing process weak alkali liquor |
| CN203904702U (en) * | 2014-04-09 | 2014-10-29 | 杭州汇维仕永盛染整有限公司 | Light alkali recycling device |
| CN108147628A (en) * | 2018-02-28 | 2018-06-12 | 大连理工大学环境工程设计研究院有限公司 | The device that a kind of ethylene waste soda residue recycles |
| CN109592853A (en) * | 2019-01-04 | 2019-04-09 | 厦门立思节能科技有限公司 | A kind of wastewater treatment method |
-
2021
- 2021-12-23 CN CN202111589926.5A patent/CN114314984A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB285933A (en) * | 1926-10-18 | 1928-02-20 | William Barrs | Improvements in or relating to the treatment of waste liquors of paper manufacture for the recovery of caustic alkali therein |
| US4627888A (en) * | 1983-02-23 | 1986-12-09 | Enso-Gutzeit Oy | Causticizing method |
| CN101585618A (en) * | 2009-06-18 | 2009-11-25 | 俞国兴 | Alkali recovery device of jean mercerizing process weak alkali liquor |
| CN203904702U (en) * | 2014-04-09 | 2014-10-29 | 杭州汇维仕永盛染整有限公司 | Light alkali recycling device |
| CN108147628A (en) * | 2018-02-28 | 2018-06-12 | 大连理工大学环境工程设计研究院有限公司 | The device that a kind of ethylene waste soda residue recycles |
| CN109592853A (en) * | 2019-01-04 | 2019-04-09 | 厦门立思节能科技有限公司 | A kind of wastewater treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108328839B (en) | Sodium-alkali flue gas desulfurization wastewater treatment system and use method | |
| CN112047553A (en) | PTA high-salinity wastewater treatment, reuse and zero-discharge system and method | |
| CN102206140B (en) | Method and production system for separating and recovering phenol oil and simultaneously producing sodium sulfite through sodium phenolate acidolysis | |
| CN111003717A (en) | Device and method for preparing alkali salt by evaporating and crystallizing sea water desalination strong brine | |
| CN114314984A (en) | Light alkali recycling device | |
| CN202038998U (en) | Production system for recycling carbolic oil through acidolysis separation of phenol sodium salt and co-producing sodium sulfite | |
| CN101591084B (en) | Method for treating glyphosate waste water and reducing the emission of carbon dioxide | |
| CN105060382A (en) | Method for treating salt-containing wastewater in production process of epoxy propane or epoxy chloropropane and apparatus for implementing method | |
| CN217732690U (en) | Retrieve gaseous device of different concentration SO2 in follow waste liquid | |
| CN104086011A (en) | Zero discharge process suitable for waste water of viscose fiber industrial acid station | |
| CN204151176U (en) | The multi-effect evaporation system of coal chemical engineering equipment strong brine | |
| CN115626788B (en) | Device for modifying steel slag through acidification and carbonization coupling | |
| CN202542834U (en) | Polycrystalline silicon waste acid reclaiming device and polyaluminium chloride (PAC) production device using same | |
| CN109574401A (en) | Textile auxiliary produces waste water zero discharge treatment process and equipment | |
| CN104193060A (en) | Multiple-effect evaporation technique and system for coal chemical industry device concentrated brine | |
| CN114436459A (en) | Method for treating wastewater discharged by ammonium fluoride production process | |
| KR102119504B1 (en) | Method and apparatus of reusing waste water using reverse osmosis | |
| CN203238124U (en) | Wastewater treating and reusing device | |
| CN107032554B (en) | Alkali-reduction wastewater quality-based treatment method and device | |
| CN215592846U (en) | Dirty sour effluent disposal system | |
| CN112250131A (en) | Ammonia nitrogen wastewater treatment method | |
| CN219567746U (en) | Treatment device for waste brine generated in furan phenol production process | |
| CN219682506U (en) | Retrieve device of applying mechanically polyether polyol catalyst | |
| CN110590509A (en) | Production method for carbon dioxide cyclic decomposition coking crude phenol coproduction desulfurizer | |
| CN109264888A (en) | Electrolytic etching of metal acid-bearing wastewater is concentrated and separated recovery process and device and waste water treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |