CN110066049A - The recovery process and system of PTA in a kind of alkali decrement waste water - Google Patents
The recovery process and system of PTA in a kind of alkali decrement waste water Download PDFInfo
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- CN110066049A CN110066049A CN201910396545.1A CN201910396545A CN110066049A CN 110066049 A CN110066049 A CN 110066049A CN 201910396545 A CN201910396545 A CN 201910396545A CN 110066049 A CN110066049 A CN 110066049A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Water Treatment By Sorption (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The present invention relates to wastewater from chemical industry to be recycled technical field, and in particular to the recovery process and system of PTA in a kind of alkali decrement waste water.The technique is delivered to alkali decrement waste water in primary treatment pond, and active carbon is added, and adsorbs the impurity in waste water；Then it is separated by filtration by the first filter press, recovered carbon；Then pass through the first filter device first time primary filter, the second filter device carries out secondary filter；Then in third reservoir, sulfuric acid and other chemical industry additives are added, the pH of waste water is tentatively adjusted by adding sulfuric acid, and stir evenly using agitating device, obtains stable pH, then added sulfuric acid in neutralisation treatment pond and carry out accurate pH adjusting；Then filters pressing processing is carried out by the second filter press, collects the solids after filters pressing to obtain poly terephthalic acid, the waste water that filters pressing is obtained enters treatment tank and carries out sewage treatment.This method can recycle PTA from alkali decrement waste water, and 96% or more the rate of recovery recycles 97% or more purity.
Description
Technical field
The present invention relates to wastewater from chemical industry to be recycled technical field, and in particular to the recycling of PTA in a kind of alkali decrement waste water
Technique and system.
Background technique
Alkali reduction is the process that dacron is handled in high temperature and denseer caustic lye of soda, and terylene surface is etched by highly basic
Afterwards, quality mitigates, and fibre diameter attenuates, and surface forms pit, and the shearing rigidity decline of fiber eliminates the pole of dacron thread
Light, and the gap of fabric intertwined point is increased, so that fabrics feel soft, soft glossy, improve moisture absorbing and sweat releasing property, there is silkworm
Soyeux style, therefore dyeing alkali decrement treatment is also referred to as Silk-Like Finishing.
Alkali Weight Reduction Treatment of Polyester is a kind of reaction process of complexity, the main multiphase occurred between polyester macromolecule object and sodium hydroxide
Hydrolysis.In sodium hydrate aqueous solution, the ester linkage hydrolyzing of fiber surface polyester molecule chain is broken, and constantly forms different polymerizations
The hydrolysate of degree, the main component of generated waste water are terephthalic acid (TPA) or its sodium salt, excessive sodium hydroxide, second two
Alcohol, polyester oligomer and a small amount of various auxiliary agents.Often there is high ph-values (> 12) and high cod values (> in alkali decrement waste water
8000mg/L) the characteristics of, and the benzene ring structure microorganism of terephthalic acid (TPA) cannot degrade, can not directly carry out biochemical place
Reason.
Existing physico-chemical process preconditioning technique is primarily present the shortcomings that two aspects: first is that causing the alkali wasting of resources and cost
It is higher.Though direct acid-precipitation method simple process, obtained terephthalic acid (TPA) purity is lower, and utility value is not high, and this method is straight
It connects and neutralizes a large amount of alkali in waste water with acid, effective recycling and reusing is not carried out to alkali, causes the larger wasting of resources.In addition, wadding
Solidifying (coagulation) acid-precipitation method is flocculated (coagulation) to waste water using materials such as organic polymer flocculating decoloring agent or aluminum sulfate in advance
Decoloration, though the purity of this terephthalic acid (TPA) for improving acid-precipitation method acquisition, its cost is also higher, and uses aluminum sulfate coagulation
The aluminium hydroxide formed afterwards can be partly dissolved again and be suspended in strong base solution, and sedimentation is difficult.Second is that complex process and filter hole
Road easily blocks.Patent CN201410023018.3 adds magnesium sulfate or magnesium chloride in alkali decrement waste water, anti-with alkali using magnesium salts
The positively charged magnesium hydrate precipitate absorption p-phthalic bridge that should be generated, and be filtered using inoranic membrane.Such film is pre-
Though processing mode can be effectively reduced COD value of waste water, there are more impurity in addition to para-phthalic sodium in filter residue, formed after acid out
Crude terephthalic acid cannot achieve high value added utilization, and with the increase of film pretreatment time, Pollutants in Wastewater matter
Various physical reactions have occurred with membrane interaction, so that pollutant is accumulated in film surface or duct, membrane aperture are caused to become smaller or block up
Plug, this reduces filter efficiency instead, and processing cost is also got higher.In addition, the prior art is using suspension, emulsification, chelating, washing etc.
Mode removes the impurity in terephthalic acid (TPA), though having achieved the purpose that separating-purifying, the process is more complicated for it, and need to match miscellaneous
The characteristic of matter.
Alkali decrement waste water pollution situation is effectively solved comprehensively in line with comprehensive, and the COD for reducing sewage discharge to the maximum extent contains
Poly terephthalic acid in waste water, is received the poly terephthalic acid PTA for being converted into utility value by amount, and elimination endangers social environment
State, and be the certain economy return of social creativity.Therefore, the present invention is intended to provide a kind of simple process, it is low in cost and
It is able to achieve the pretreating process of the reuse terephthalic acid (TPA) purification of alkali in alkali decrement waste water.
Summary of the invention
The purpose of the present invention is to solve the above problem, the recovery process of PTA in a kind of alkali decrement waste water is provided and is
System.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
PTA recovery process in a kind of alkali decrement waste water, the specific steps are as follows:
Alkali decrement waste water is delivered in buck collecting pit (1) by step 1, is concentrated stand-by；
Alkali decrement waste water is delivered in primary treatment pond (2) by step 2, and activity is added in primary treatment pond (2)
Charcoal adsorbs the impurity in waste water；
Waste water in primary treatment pond (2) is delivered in the first filter press (3), waste water quilt by step 3 with centrifugal pump (18)
It is depressed into the closed filter chamber that adjacent two filter plate is formed, filter cloth both sides is made to form pressure difference, realization is separated by filtration；And pass through the first pressure
Active carbon is recycled in active carbon recycling can (19) by filter (3), carries out subsequent processing；
The waste water for removing active carbon is entered in the first reservoir (4), then is delivered to by centrifugal pump (18) by step 4
In second reservoir (5)；
Waste water is delivered in the first filter device (6) by step 5 by centrifugal pump (18), carries out first time primary filter,
Then it is delivered to the second filter device (7) again and carries out secondary filter；
The waste water of filtering is delivered in third reservoir (8) by step 6, be added in the third reservoir (8) sulfuric acid and its
His chemical industry additive tentatively adjusts the pH of waste water by adding sulfuric acid, and use agitating device (13) stirs evenly, and is stablized
PH；
Waste water after preliminary adjusting pH is delivered to neutralisation treatment pond by step 7, and sulfuric acid is added in neutralisation treatment pond (9)
Carry out accurate pH adjusting；
Waste water after accurate adjusting pH is delivered to filter press progress filters pressing processing by step 8, and the solids after filters pressing is received
Collection obtains poly terephthalic acid, and the waste water that filters pressing is obtained enters treatment tank and carries out sewage treatment.
Scheme as a further preference, third reservoir (8) pH of waste water after preliminary pH adjusting is 7-8.
Scheme as a further preference, waste water is 3-4 after accurate pH is adjusted in neutralisation treatment pond (9).
Scheme as a further preference, waste water is 3.5-4 after accurate pH is adjusted in neutralisation treatment pond (9).
A kind of recovery system suitable for above-mentioned recovery process, the recovery system successively include buck collecting pit (1), just
Grade processing pond (2), the first filter press (3), the first reservoir (4), the second reservoir (5), the first filter device (6), the second mistake
Filter device (7), third reservoir (8), neutralisation treatment pond (9), the second filter press (10)；Primary treatment pond is provided with work on (2)
Property charcoal adding apparatus (11)；First filter press (3) is connected with active carbon recycling device (12)；Third reservoir is provided on (8)
Agitating device (13), and it is connected with additive storage tank (14)；Neutralisation treatment pond (9) is connected with concentrated sulfuric acid storage tank (15)；Second pressure
Filter (10) is connected with treatment tank (16) and PTA collection device (17).
Scheme as a further preference, between buck collecting pit (1) and primary treatment pond (2), primary treatment pond (2) and
Centrifugal pump (18) are provided between first filter press (3).
Scheme as a further preference, between the first reservoir (4), the second reservoir (5) and the first filter device (6)
It is equipped with centrifugal pump (18).
Scheme as a further preference, active carbon recycling device (12) include active carbon recycling can (19) and burning boiler
(20)。
Scheme as a further preference, buck collecting pit (1), primary treatment pond (2), the first reservoir (4), the second storage
Liquid bath (5), third reservoir (8) are provided with level monitoring device (21) in neutralisation treatment pond (9).
Scheme as a further preference, buck collecting pit (1), primary treatment pond (2), the first reservoir (4), the second storage
Liquid bath (5), third reservoir (8) are provided with liquid level alarm device (22) in neutralisation treatment pond (9).
Compared with prior art, the present invention beneficial effect is: PTA can be recycled from alkali decrement waste water, the rate of recovery can
Reach 96% or more, for recycling purity 97% or more, this method can utilize waste and old retrieval of sulfuric acid PTA, not only solve waste water
The recycling problem that middle terephthalic acid (TPA) is received, additionally it is possible to improve the cyclic utilization rate of waste water, so as to by PTA after the recovery again
For producing and living.Meanwhile reducing COD value, reduce sewage discharge, effective protection environment saves resource, improves
Economic benefit.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is the structural schematic diagram of recovery system of the invention.
In figure: 1 buck collecting pit, 2 primary treatment ponds, 3 first filter presses, 4 first reservoirs, 5 second reservoirs, 6
Dress is added in one filter device, 7 second filter devices, 8 third reservoirs, 9 neutralisation treatment ponds, 10 second filter presses, 11 active carbons
It sets, 12 active carbon recycling devices, 13 agitating devices, 14 additive storage tanks, 15 concentrated sulfuric acid storage tanks, 16 treatment tanks, 17PTA is received
Acquisition means, 18 centrifugal pumps, 19 active carbon recycling cans, 20 burning boilers.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation.
If raw material employed in the embodiment of the present invention is raw material commonly used in the art without specified otherwise, implement
Method employed in example, is the conventional method of this field.
Embodiment:
PTA recovery process in a kind of alkali decrement waste water, the specific steps are as follows:
Alkali decrement waste water is delivered in buck collecting pit (1) by step 1, concentrates stand-by, wastewater pH 11-12；
Alkali decrement waste water is delivered in primary treatment pond (2) by step 2, and is added in primary treatment pond (2) and is given up relatively
5% active carbon of water weight stirs 30min, adsorbs the impurity in waste water；
Waste water in primary treatment pond (2) is delivered in the first filter press (3), waste water quilt by step 3 with centrifugal pump (18)
It is depressed into the closed filter chamber that adjacent two filter plate is formed, filter cloth both sides is made to form pressure difference, realization is separated by filtration；And pass through the first pressure
Active carbon is recycled in active carbon recycling can (19) by filter (3), carries out subsequent processing；
The waste water for removing active carbon is entered in the first reservoir (4), then is delivered to by centrifugal pump (18) by step 4
In second reservoir (5)；
Waste water is delivered in the first filter device (6) by step 5 by centrifugal pump (18), carries out first time primary filter,
Then it is delivered to the second filter device (7) again and carries out secondary filter；
The waste water of filtering is delivered in third reservoir (8) by step 6, be added in the third reservoir (8) sulfuric acid and its
His chemical industry additive tentatively adjusts the pH of waste water by adding sulfuric acid, and use agitating device (13) stirs evenly, and is stablized
PH；The pH of waste water is 7-8 after preliminary pH adjusting；
Waste water after preliminary adjusting pH is delivered to neutralisation treatment pond by step 7, and sulfuric acid is added in neutralisation treatment pond (9)
Carry out accurate pH adjusting；Waste water is 3-4 after accurate pH is adjusted, and best price adjustment is 3.5-4；
Waste water after accurate adjusting pH is delivered to the second filter press (10) progress filters pressing processing by step 8, after filters pressing
Solids is collected to obtain poly terephthalic acid, and the waste water that filters pressing is obtained enters treatment tank and carries out sewage treatment.
Above-mentioned technique of the invention can recycle PTA from alkali decrement waste water, and the rate of recovery can reach 96% or more, recycling
For purity 97% or more, this method can utilize waste and old retrieval of sulfuric acid PTA, not only solve time that terephthalic acid (TPA) in waste water is received
Receipts problem, additionally it is possible to the cyclic utilization rate of waste water is improved, so as to which PTA after the recovery to be reused for producing and live.Section
Resource has been saved, economic benefit is improved.
A kind of recovery system suitable for above-mentioned recovery process, as shown in Fig. 2, the recovery system successively includes that buck is received
Ji Chi (1), primary treatment pond (2), the first filter press (3), the first reservoir (4), the second reservoir (5), the first filter device
(6), the second filter device (7), third reservoir (8), neutralisation treatment pond (9), the second filter press (10)；Primary treatment pond (2)
On be provided with active carbon adding apparatus (11)；First filter press (3) is connected with active carbon recycling device (12)；Third reservoir
(8) it is provided with agitating device (13) on, and is connected with additive storage tank (14)；Neutralisation treatment pond (9) is connected with concentrated sulfuric acid storage tank
(15)；Second filter press (10) is connected with treatment tank (16) and PTA collection device (17).
It is arranged between buck collecting pit (1) and primary treatment pond (2), between primary treatment pond (2) and the first filter press (3)
There are centrifugal pump (18)；Centrifugal pump is equipped between first reservoir (4), the second reservoir (5) and the first filter device (6)
(18)；Active carbon recycling device (12) includes active carbon recycling can (19) and burning boiler (20)；Buck collecting pit (1), primary
Processing pond (2), the first reservoir (4), the second reservoir (5), third reservoir (8), neutralisation treatment pond are provided with liquid level in (9)
Monitoring device (21)；Buck collecting pit (1), primary treatment pond (2), the first reservoir (4), the second reservoir (5), third liquid storage
Liquid level alarm device (22) are provided in slot (8), neutralisation treatment pond (9).
The above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that this hair
It is bright to be not limited to specific embodiment described here, be able to carry out for a person skilled in the art it is various it is apparent variation, again
Adjustment and substitution are without departing from protection scope of the present invention.Therefore, although by above embodiments to the present invention carried out compared with
For detailed description, but the present invention is not limited to the above embodiments only and above-described embodiment expressed by processing capacity it is big
Small and processing purification degree height can also include without departing from the inventive concept more other equivalent embodiments,
And the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. PTA recovery process in a kind of alkali decrement waste water, which is characterized in that specific step is as follows:
Alkali decrement waste water is delivered in buck collecting pit (1) by step 1, is concentrated stand-by；
Alkali decrement waste water is delivered in primary treatment pond (2) by step 2, and active carbon is added in primary treatment pond (2), is inhaled
Impurity in attached waste water；
Waste water in primary treatment pond (2) is delivered in the first filter press (3) by step 3 with centrifugal pump (18), and waste water is depressed into
In the closed filter chamber that adjacent two filter plate is formed, filter cloth both sides is made to form pressure difference, realization is separated by filtration；And pass through the first filter press
(3) active carbon is recycled in active carbon recycling can (19), carries out subsequent processing；
The waste water for removing active carbon is entered in the first reservoir (4), then is delivered to second by centrifugal pump (18) by step 4
In reservoir (5)；
Waste water is delivered in the first filter device (6) by step 5 by centrifugal pump (18), carries out first time primary filter, then
It is delivered to the second filter device (7) again and carries out secondary filter；
The waste water of filtering is delivered in third reservoir (8) by step 6, sulfuric acid is added in third reservoir (8), by adding
Add sulfuric acid tentatively to adjust the pH of waste water, and stirred evenly using agitating device (13), obtains stable pH；
Waste water after preliminary adjusting pH is delivered to neutralisation treatment pond by step 7, and addition sulfuric acid carries out in neutralisation treatment pond (9)
Accurate pH is adjusted；
Waste water after accurate adjusting pH is delivered to the progress filters pressing processing of the second filter press by step 8, and the solids after filters pressing is received
Collection obtains poly terephthalic acid, and the waste water that filters pressing is obtained enters treatment tank and carries out sewage treatment.
2. PTA recovery process in a kind of alkali decrement waste water according to claim 1, which is characterized in that third reservoir (8)
The pH of waste water is 7-8 after preliminary pH adjusting.
3. PTA recovery process in a kind of alkali decrement waste water according to claim 1, which is characterized in that neutralisation treatment pond (9)
In accurate pH adjust after waste water be 3-4.
4. PTA recovery process in a kind of alkali decrement waste water according to claim 1, which is characterized in that neutralisation treatment pond (9)
In accurate pH adjust after waste water be 3.5-4.
5. a kind of recovery system suitable for recovery process described in any of the above-described claim, which is characterized in that described time
Receipts system successively includes buck collecting pit (1), primary treatment pond (2), the first filter press (3), the first reservoir (4), the second storage
Liquid bath (5), the first filter device (6), the second filter device (7), third reservoir (8), neutralisation treatment pond (9), the second filters pressing
Machine (10)；Active carbon adding apparatus (11) are provided on primary treatment pond (2)；First filter press (3) is connected with active carbon recycling
Device (12)；It is provided with agitating device (13) on third reservoir (8), and is connected with additive storage tank (14)；Neutralisation treatment pond
(9) concentrated sulfuric acid storage tank (15) are connected with；Second filter press (10) is connected with treatment tank (16) and PTA collection device (17).
6. PTA recovery system in a kind of alkali decrement waste water according to claim 5, which is characterized in that buck collecting pit (1)
Centrifugal pump (18) are provided between primary treatment pond (2), between primary treatment pond (2) and the first filter press (3).
7. PTA recovery system in a kind of alkali decrement waste water according to claim 5, which is characterized in that the first reservoir
(4), it is equipped between the second reservoir (5) and the first filter device (6) centrifugal pump (18).
8. PTA recovery system in a kind of alkali decrement waste water according to claim 5, which is characterized in that active carbon recycling dress
Setting (12) includes active carbon recycling can (19) and burning boiler (20).
9. PTA recovery system in a kind of alkali decrement waste water according to claim 5, which is characterized in that buck collecting pit
(1), primary treatment pond (2), the first reservoir (4), the second reservoir (5), third reservoir (8), neutralisation treatment pond are set in (9)
It is equipped with level monitoring device.
10. PTA recovery system in a kind of alkali decrement waste water according to claim 5, which is characterized in that buck collecting pit
(1), primary treatment pond (2), the first reservoir (4), the second reservoir (5), third reservoir (8), neutralisation treatment pond are set in (9)
It is equipped with liquid level alarm device.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103951106A (en) * | 2014-04-28 | 2014-07-30 | 上海大学 | Method for recycling terephthalic acid in polyester fiber alkali peeling process wastewater |
| CN203904080U (en) * | 2014-04-09 | 2014-10-29 | 杭州汇维仕永盛染整有限公司 | System for recovering PTA (purified terephthalic acid) during treatment of alkali-decrement wastewater |
| CN106517580A (en) * | 2016-11-23 | 2017-03-22 | 江苏聚杰微纤纺织科技集团有限公司 | Method for recovering high-purity PTA (p-phthalic acid) from alkali-minimization wastewater of chemical fibers |
| US20170190604A1 (en) * | 2015-12-31 | 2017-07-06 | Bp Corporation North America Inc. | Use of magnesium hydroxide in the neutralization of pta wastewater |
-
2019
- 2019-05-14 CN CN201910396545.1A patent/CN110066049A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203904080U (en) * | 2014-04-09 | 2014-10-29 | 杭州汇维仕永盛染整有限公司 | System for recovering PTA (purified terephthalic acid) during treatment of alkali-decrement wastewater |
| CN103951106A (en) * | 2014-04-28 | 2014-07-30 | 上海大学 | Method for recycling terephthalic acid in polyester fiber alkali peeling process wastewater |
| US20170190604A1 (en) * | 2015-12-31 | 2017-07-06 | Bp Corporation North America Inc. | Use of magnesium hydroxide in the neutralization of pta wastewater |
| CN106517580A (en) * | 2016-11-23 | 2017-03-22 | 江苏聚杰微纤纺织科技集团有限公司 | Method for recovering high-purity PTA (p-phthalic acid) from alkali-minimization wastewater of chemical fibers |
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Application publication date: 20190730 |