CN103694112A - Method and system for purifying terephthalic acid - Google Patents
Method and system for purifying terephthalic acid Download PDFInfo
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- CN103694112A CN103694112A CN201310676851.3A CN201310676851A CN103694112A CN 103694112 A CN103694112 A CN 103694112A CN 201310676851 A CN201310676851 A CN 201310676851A CN 103694112 A CN103694112 A CN 103694112A
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- terephthalic acid
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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
Abstract
The invention relates to a method for purifying terephthalic acid. The method comprises the following steps: uniformly mixing a terephthalic acid crude product with water, raising the temperature to 200-300 DEG C, raising the pressure to 1.5-8.6MPa to obtain a terephthalic acid water solution; keeping the temperature to be 200-300 DEG C and the pressure to be 1.5-8.6MPa, filtering the terephthalic acid water solution through a filtering layer, collecting filtrate, wherein the filtering layer comprises a support body and a filter cake, the support body is provided with a large quantity of holes, the filter cake is made of a powdery filtering material, the powdery filtering material is kieselguhr or active carbon; and reducing the filtrate to normal temperature and normal pressure to obtain a terephthalic acid crystal. According to the method for purifying the terephthalic acid, the terephthalic acid water solution is filtered through the filtering layer, organic matters, micromolecular colloids and suspended particles which do not dissolve in water in the terephthalic acid water solution are adsorbed through the filtering layer, thus the purity of the terephthalic acid is greatly improved, the obtained filtrate is colorless and is free from extraneous odor, the filtrate is subjected to pressure relief and cooled, thus the terephthalic acid crystal with high purity is obtained. In addition, the invention further provides a system for purifying the terephthalic acid.
Description
Technical field
The present invention relates to chemical reagent purifying field, particularly relate to a kind of purification process and purification system of terephthalic acid.
Background technology
The alkali decrement waste water of textile printing and dyeing industry is produced through alkali decrement operation by clothes such as terylene, mainly contain ethylene glycol, terephthalic acid and terephthalic acid and be dissolved in the para-phthalic sodium that alkali lye is transformed, also may have other polyester polymers and a small amount of various auxiliary agents, the ratio of polymeric quantity or monomer is relevant with caustic reduction processing process and operational condition simultaneously.Alkali decrement waste water is pH value high (being generally greater than 12) not only, and organic concentration is high.By alkali decrement waste water individual curing, reclaim terephthalic acid wherein, not only can greatly reduce the COD in waste liquid, alleviate sewage disposal load, there is good environmental benefit, the recycling of terephthalic acid, realizes good economic benefit simultaneously.
Alkali decrement waste water reclaimed materials, pond material and the contaminated terephthaldehyde's acid crudes such as material that are scattered, cannot directly utilize, and discarded meeting cause very big destruction to environment.Therefore, be necessary terephthaldehyde's acid crude to carry out purifying, it can efficiently be utilized.
The purification process of traditional terephthaldehyde's acid crude has abstraction purification method and medicament conversion method etc.The purification process of traditional terephthaldehyde's acid crude, need to introduce extraction agent or chemical agent, and extraction agent and chemical agent have certain toxicity, larger to operator and environmental hazard.
Summary of the invention
Based on this, be necessary to provide a kind of purification process and purification system to operator and the less terephthalic acid of environmental hazard.
A purification process for terephthalic acid, comprises the following steps:
Terephthaldehyde's acid crude and water are mixed, be warming up to 200 ℃～300 ℃, boost to 1.5MPa～8.6MPa, obtain aqueous terephthalic acid solution;
Keeping temperature is 200 ℃～300 ℃, pressure is 1.5MPa～8.6MPa, the described aqueous terephthalic acid solution filtering layer of flowing through is filtered, collect filtrate, described filtering layer comprises supporter and filter cake, described supporter has a large amount of holes, and the material of described filter cake is Powdered filtering material, and described Powdered filtering material is diatomite or gac;
Described filtrate is down to normal temperature and pressure, obtains terephthalic acid crystals.
In an embodiment, the particle diameter of described Powdered filtering material is 0.1 μ m～100 μ m therein.
In an embodiment, the original depth of described filter cake is 3mm～5mm therein.
In an embodiment, the material of described supporter is stainless steel, stupalith or macromolecular material high temperature resistant, acid resistance corrosion therein.
In an embodiment, the aperture in the hole of described supporter is 1 μ m～100 μ m therein.
In an embodiment, the surface coverage of described supporter has micropore filter cloth or macromolecular filter membrane therein.
Therein in an embodiment, described filtering layer is adopted preparation with the following method: described Powdered filtering material and water are mixed, after stirring, obtain suspension, follow described suspension flow through described supporter, filter cake is held back and formed on supporter to Powdered filtering material in described suspension by described supporter, described supporter forms described filtering layer together with described filter cake.
In an embodiment, before described aqueous terephthalic acid solution is filtered, can also in described aqueous terephthalic acid solution, add Powdered filtering material therein.
In an embodiment, dry after also comprising the steps: described terephthalic acid crystals to clean therein, obtain pure terephthalic acid.
A purification system for terephthalic acid, comprising:
Close dissolving device, for terephthaldehyde's acid crude and water are mixed, is warming up to 200 ℃～300 ℃, boosts to 1.5MPa～8.6MPa, obtains aqueous terephthalic acid solution;
Airtight filtration unit, comprise filtering layer, it is 200 ℃～300 ℃ in temperature that described airtight filtration unit is used for, pressure is under the condition of 1.5MPa～8.6MPa, flow through described filtering layer of described aqueous terephthalic acid solution in described close dissolving device is filtered, and described filtering layer comprises supporter and filter cake, and described supporter has a large amount of holes, the material of described filter cake is Powdered filtering material, and described Powdered filtering material is diatomite or gac;
Crystallization apparatus, the filtrate obtaining after described airtight filtration unit filters for collecting described aqueous terephthalic acid solution, and described filtrate is down to normal temperature and pressure, obtain terephthalic acid crystals.
The purification process of above-mentioned terephthalic acid, after terephthaldehyde's acid crude is water-soluble, the filtering layer being formed by supporter and filter cake of flowing through filters, water-fast organism in aqueous terephthalic acid solution, small molecules colloid and suspended particle are all filtered layer absorption, greatly improve the purity of terephthalic acid, the colourless free from extraneous odour of filtrate obtaining, filtrate release is cooling, obtain highly purified terephthalic acid crystals.The purification process of above-mentioned terephthalic acid only need can be removed the pollutent in aqueous terephthalic acid solution by filtering layer, less to operator and environmental hazard.
Accompanying drawing explanation
Fig. 1 is the schema of purification process of the terephthalic acid of an embodiment.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement to be much different from alternate manner described here, and those skilled in the art can do similar improvement without prejudice to intension of the present invention in the situation that, so the present invention is not subject to the restriction of following public concrete enforcement.
As shown in Figure 1, the purification process of the terephthalic acid of an embodiment, comprises the following steps:
S10, terephthaldehyde's acid crude and water are mixed, be warming up to 200 ℃～300 ℃, boost to 1.5MPa～8.6MPa, obtain aqueous terephthalic acid solution.
The terephthaldehyde's acid crude forming in the wet crude terephthalic acid that terephthaldehyde's acid crude can reclaim for acid out in printing and dyeing mill's alkali decrement waste water or other industrial production such as terephthaldehyde's acid crude in the material of pond, chemical plant.
In the aqueous terephthalic acid solution obtaining, the mass percent of terephthalic acid is 3%～20%.
S20, to keep temperature be 200 ℃～300 ℃, and pressure is 1.5MPa～8.6MPa, and the aqueous terephthalic acid solution filtering layer of flowing through is filtered, and collects filtrate.
Filtering layer comprises supporter and filter cake, and supporter has large metering-orifice, and the material of filter cake is Powdered filtering material, and Powdered filtering material is diatomite or gac.
The material of supporter can be stainless steel, stupalith or macromolecular material.Certainly, the material of supporter can also select other to have some strength, high temperature high voltage resistant, acid resistance corrosion, on-deformable material.The aperture in the hole of supporter can be 1 μ m～100 μ m.Certainly, the aperture in the hole of supporter can be also 1 μ m～20 μ m.Most of Powdered filtering material can be held back in small-bore.
Supporter can have more smooth surface.Supporting body surface also can be coated with micropore filter cloth or macromolecular filter membrane.Micropore filter cloth and macromolecular filter membrane have large metering-orifice, and pore diameter range is at 1 μ m～100 μ m.Certainly, the aperture in the hole of micropore filter cloth and macromolecular filter membrane can be also 1 μ m～20 μ m.When filter cake, to hold back pollutent saturated or approach when saturated, by back-flushing method, filter cake is broken up, because supporting body surface is smooth, or be coated with micropore filter cloth or macromolecular filter membrane, pollutent and Powdered filtering material are easily discharged with washing fluid from supporting body surface.Part filter opening in filter cake is blocked, or cake filtration water environment capacity being when approaching or reaching capacity, and can facilitate and by back flushing, filter cake is discharged to reaction unit with washing fluid fast.
Filtering layer is carried out to being operating as of back flushing: from the outlet of reaction unit, import pure water, reverse direction flow is crossed supporter and filter cake, make the filter cake after polluting be broken up and discharge from reaction unit entrance with current, then, from the outlet of reaction unit, oppositely import pressurized air, remove the hole of supporter and the Powdered filtering material of remained on surface and pollutent and discharge from reaction unit entrance, last, from the outlet of reaction unit, import pure water, reverse direction flow is crossed supporter and is completed backwash operation.Above-mentioned backwash operation is by making pure water and pressurized air enter from the outlet of reaction unit, and entrance goes out, and can remove pollutent without dismounting reaction unit, guarantees stopping property and security when reaction unit is worked under high-temperature and high-pressure conditions.
In the present embodiment, the particle diameter of Powdered filtering material can be 0.1 μ m～100 μ m.The thickness of filter cake can be 3mm～5mm.Adopt diatomite and gac as Powdered filtering material, low price, be easy to regeneration, and itself has porousness, stable in properties, is not reacting with water and terephthalic acid under with interior temperature and the pressure-acting below 8.6MPa lower than 300 ℃, and the filter cake of its formation can be held back insolubles, absorb polluted matter and colourity, and can not stop up fluid passage.
In the present embodiment, filtering layer is adopted preparation with the following method: Powdered filtering material and water are mixed, after stirring, obtain suspension, follow suspension flow through supporter, filter cake is held back and formed on supporter to the supported body of Powdered filtering material in suspension, and supporter forms filtering layer together with filter cake.
Due to good absorption and the filteration of filtering layer, the filtrate that S20 collects is the filtrate of clarification.
S30, filtrate is down to normal temperature and pressure, obtains terephthalic acid crystals.
In S30, cooling can be naturally cooling; Also can filtrate be carried out cooling with the speed of cooling of 2 ℃/min～5 ℃/min; Also can be cooled to 230 ℃ of insulation half an hour, then be cooled to 215 ℃ of insulations then to continue to be cooled to normal temperature half an hour.
The purification process of above-mentioned terephthalic acid is dry after can also comprising the steps: terephthalic acid crystals to clean, and obtains pure terephthalic acid.The number of times that terephthalic acid crystals is cleaned can be 1～4 time, and the number of times that terephthalic acid crystals is cleaned certainly can increase on demand, but wash number is too much unsuitable, prevents that terephthalic acid runs off.
Before carrying out S30, can also in aqueous terephthalic acid solution, add Powdered filtering material.Powdered filtering material can be powdered active carbon or diatomite.The phthalic acid water solution flow that is added with Powdered filtering material is filtered through filtering layer, and the Powdered filtering material that filtering layer is held back in aqueous terephthalic acid solution is thickeied filter cake on former filter cake, can make the dirt content of filter cake further strengthen.
The purification process of above-mentioned terephthalic acid, after terephthaldehyde's acid crude is water-soluble, the filtering layer being formed by supporter and filter cake of flowing through filters, water-fast organism in aqueous terephthalic acid solution, small molecules colloid and suspended particle are all filtered layer absorption, greatly improve the purity of terephthalic acid, the colourless free from extraneous odour of filtrate obtaining, filtrate release is cooling, obtain highly purified terephthalic acid crystals.The purification process of above-mentioned terephthalic acid only need can be removed the pollutent in aqueous terephthalic acid solution by filtering layer, less to operator and environmental hazard.And Powdered filtering material low price, cost is lower.The method that adopts filtering layer to filter, without introducing chemical reagent, can not introduce new pollutent, is conducive to improve the purity of phthalic acid.
In the purification process of above-mentioned terephthalic acid, move back film without dismounting reaction unit, very efficient and convenient, maintenance cycle of extension device greatly, the reliability that assurance equipment is worked under High Temperature High Pressure also reduces processing cost, realize the optimization utilization of resource, there is good environmental benefit and economic benefit.
The purification system of the terephthalic acid of one embodiment, comprises close dissolving device, airtight filtration unit and crystallization apparatus.
Close dissolving device, for terephthaldehyde's acid crude and water are mixed, is warming up to 200 ℃～300 ℃, boosts to 1.5MPa～8.6MPa, obtains aqueous terephthalic acid solution.
Airtight filtration unit, comprise filtering layer, it is 200 ℃～300 ℃ in temperature that airtight filtration unit is used for, pressure is under the condition of 1.5MPa～8.6MPa, aqueous terephthalic acid solution in the close dissolving device filtering layer of flowing through is filtered, and filtering layer comprises supporter and filter cake, and supporter has a large amount of holes, the material of filter cake is Powdered filtering material, and Powdered filtering material is diatomite or gac.
Crystallization apparatus, the filtrate obtaining after airtight filtration unit filters for collecting aqueous terephthalic acid solution, and filtrate is down to normal temperature and pressure, obtain terephthalic acid crystals.
The purification system of above-mentioned terephthalic acid, in close dissolving device, terephthaldehyde's acid crude is water-soluble.Flow through airtight filtration unit of aqueous terephthalic acid solution filters, water-fast organism in aqueous terephthalic acid solution, small molecules colloid and suspended particle are all sealed the filtering layer absorption of filtration unit, greatly improve the purity of terephthalic acid, the colourless free from extraneous odour of filtrate obtaining.By crystallization apparatus, collect filtrate, and filtrate is down to normal temperature and pressure, obtain terephthalic acid crystals.
The particle diameter of the crude terephthalic acid crystal grain conventionally extracting in decrement water is very little, most of below 5 μ m, add pollutent and comprise a lot of viscosity small-molecule substances, when being filtered, this crude terephthalic acid is easy to form fine and close cake layer, dehydration property is very poor, therefore be difficult to directly clean, trickle crystal grain has bigger serface and more easily adsorbs impurity and cause terephthalic acid purity drop.Heating impels terephthalic acid to dissolve in water, is convenient to by diatomite filtration layer, thereby insolubles is filtered layer, stops and reaches purification object.Meanwhile, heating can also make these contaminant tack small-molecule substance sex change solidify, and with the impurity after time variation, is insoluble in water, is easy to be filtered layer and removes.After heating and filtering, control cooling time and speed of cooling, obtain the larger terephthalic acid crystals that we wish, general control is more than 200 μ m.Conventionally the terephthalic acid crystals obtaining is inner impure considerably less, and larger terephthalic acid crystals has the impurity phase of less specific surface area thereby surface adsorption to less, so terephthalic acid purity has obvious lifting.Remove significantly improving compared with macrocrystal dewatering after a large amount of impurity, so also raising greatly of cleaning performance, terephthalate product purity can be brought up to more than 99%, and because water content significantly reduces, corresponding drying cost also significantly reduces.
Be specific embodiment part below.
Embodiment 1
The powder diatomite that by 3g particle diameter is 8 μ m～28 μ m mixes with 100g water, after stirring, obtains suspension.In high temperature high pressure device, near outlet position, ceramic post sintering supporter is housed, this ceramic supporting body micropore size is 10 μ m.The above-mentioned diatomite suspension preparing is pumped into device portal, and liquid is discharged from device outlet after seeing through supporter, waits on supporter and forms after the diatomite filter cake that 3mm is thick, uses clear water instead and enters, until the water that outlet is discharged is limpid.Obtain filtering layer.
Embodiment 2
The Powdered Activated Carbon that by 3g particle diameter is 1 μ m～100 μ m mixes with 100g water, after stirring, obtains suspension.In high temperature high pressure device, near outlet position, ceramic post sintering supporter is housed, this ceramic supporting body micropore size is 20 μ m.The above-mentioned diatomite suspension preparing is pumped into device portal, and liquid is discharged from device outlet after seeing through supporter, waits on supporter and forms after the diatomite filter cake that 5mm is thick, uses clear water instead and enters, until the water that outlet is discharged is limpid.Obtain filtering layer.
Embodiment 3
Wet terephthaldehyde's acid crude (purity 92%, water ratio approximately 50%～60%) 25g that in Qu Mou printing and dyeing mill alkali decrement waste water, acid out reclaims, adds water to 200mL, stirs to be mixed with mass concentration and to be about 6% mixed solution.Mixed solution is added in the closed reactor with the filtering layer that embodiment 1 makes, be warming up to 200 ℃, boost to 1.5MPa, insulation 40min.After substantially water-soluble Deng terephthaldehyde's acid crude, obtain aqueous terephthalic acid solution.Keep temperature and pressure constant, aqueous terephthalic acid solution, with the flow speed of the 0.3L/min filtering layer that embodiment 1 makes of flowing through, is collected to filtrate.Filtering layer is held back the impurity such as water-fast organism, small molecules colloid, suspended particle, and adsorbs peculiar smell colourity etc. and make to see through liquid clarification.Filtrate is down to normal temperature and pressure, separates out terephthalic acid crystals.Terephthalic acid crystals is cleaned 3 times with pure water, dry, obtain more than 99% terephthalic acid of purity.
Embodiment 4
Wet terephthaldehyde's acid crude (purity 92%, water ratio approximately 50%～60%) 25g that in Qu Mou printing and dyeing mill alkali decrement waste water, acid out reclaims, adds water to 200mL, stirs to be mixed with mass concentration and to be about 6% mixed solution.Mixed solution is added in the closed reactor with the filtering layer that embodiment 2 makes, be warming up to 300 ℃, boost to 8.6MPa, insulation 18min.After substantially water-soluble Deng terephthaldehyde's acid crude, obtain aqueous terephthalic acid solution.Keep temperature and pressure constant, aqueous terephthalic acid solution, with the flow speed of the 0.5L/min filtering layer that embodiment 1 makes of flowing through, is collected to filtrate.Filtering layer is held back the impurity such as water-fast organism, small molecules colloid, suspended particle, and adsorb peculiar smell colourity etc. and make to see through liquid clarification, filtrate is down to normal temperature and pressure, terephthalic acid crystals is separated out, terephthalic acid crystals is cleaned 3 times with pure water, dry, obtain more than 99% terephthalic acid of purity.
Embodiment 5
Get certain pond, chemical plant material terephthaldehyde's acid crude (purity 85%, water ratio approximately 50%) 28g, add water to 200mL, stirring is mixed with mass concentration and is about 7% mixed solution, then adds 0.6g Powdered Activated Carbon.After mixing, be warming up to 250 ℃, boost to 4.0MPa, stir insulation 3min.After substantially water-soluble Deng terephthaldehyde's acid crude, obtain aqueous terephthalic acid solution.Keep temperature and pressure constant, by aqueous terephthalic acid solution with the flow through filtering layer of embodiment 2 preparations of the flow speed of 0.5L/min.Filtering layer is held back the impurity such as water-fast organism, small molecules colloid and suspended particle, and holds back Powdered Activated Carbon.The Powdered Activated Carbon of holding back deposits on former filter cake, thereby thickeies former filter cake, and the dirt content of filter cake is further strengthened.The filtrate of collecting, with the cooling of 3 ℃/min rate of temperature fall, is separated out to terephthalic acid crystals.Terephthalic acid crystals is cleaned 4 times with pure water, and dewatered drying, obtains more than 99% terephthalic acid of purity.
Embodiment 6
Flow by pure water with 2L/min imports from the reaction unit outlet with contaminated diatomite filter cake and supporter, and reverse direction flow is crossed supporter and filter cake, makes the filter cake after polluting be broken up and discharge from reaction unit entrance with current.After clear water back flushing 1min, from reaction unit outlet, oppositely import pressurized air and carry out air purge with the flow of 10L/min, remove at residual Powdered filtering material and the pollutent on supporter hole and surface and discharge from reaction unit entrance.After air purge 30 seconds, then with the clear water back flushing of 2L/min flow 30 seconds, can complete the cleaning of reaction unit.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a purification process for terephthalic acid, is characterized in that, comprises the following steps:
Terephthaldehyde's acid crude and water are mixed, be warming up to 200 ℃～300 ℃, boost to 1.5MPa～8.6MPa, obtain aqueous terephthalic acid solution;
Keeping temperature is 200 ℃～300 ℃, pressure is 1.5MPa～8.6MPa, the described aqueous terephthalic acid solution filtering layer of flowing through is filtered, collect filtrate, described filtering layer comprises supporter and filter cake, described supporter has a large amount of holes, and the material of described filter cake is Powdered filtering material, and described Powdered filtering material is diatomite or gac;
Described filtrate is down to normal temperature and pressure, obtains terephthalic acid crystals.
2. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, the particle diameter of described Powdered filtering material is 0.1 μ m～100 μ m.
3. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, the thickness of described filter cake is 3mm～5mm.
4. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, the material of described supporter is stainless steel, stupalith or macromolecular material.
5. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, the aperture in the hole of described supporter is 1 μ m～100 μ m.
6. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, the surface coverage of described supporter has micropore filter cloth or macromolecular filter membrane.
7. the purification process of terephthalic acid as claimed in claim 1, it is characterized in that, described filtering layer is adopted preparation with the following method: described Powdered filtering material and water are mixed, after stirring, obtain suspension, follow described suspension flow through described supporter, filter cake is held back and formed on supporter to Powdered filtering material in described suspension by described supporter, described supporter forms described filtering layer together with described filter cake.
8. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, before described aqueous terephthalic acid solution is filtered, can also in described aqueous terephthalic acid solution, add Powdered filtering material.
9. the purification process of terephthalic acid as claimed in claim 1, is characterized in that, dry after also comprising the steps: described terephthalic acid crystals to clean, and obtains pure terephthalic acid.
10. a purification system for terephthalic acid, is characterized in that, comprising:
Close dissolving device, for terephthaldehyde's acid crude and water are mixed, is warming up to 200 ℃～300 ℃, boosts to 1.5MPa～8.6MPa, obtains aqueous terephthalic acid solution;
Airtight filtration unit, comprise filtering layer, it is 200 ℃～300 ℃ in temperature that described airtight filtration unit is used for, pressure is under the condition of 1.5MPa～8.6MPa, flow through described filtering layer of described aqueous terephthalic acid solution in described close dissolving device is filtered, and described filtering layer comprises supporter and filter cake, and described supporter has a large amount of holes, the material of described filter cake is Powdered filtering material, and described Powdered filtering material is diatomite or gac;
Crystallization apparatus, the filtrate obtaining after described airtight filtration unit filters for collecting described aqueous terephthalic acid solution, and described filtrate is down to normal temperature and pressure, obtain terephthalic acid crystals.
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| CN109119713A (en) * | 2018-08-24 | 2019-01-01 | 广西师范大学 | A kind of method of positive active material in recycling lithium ion battery |
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| CN103408421A (en) * | 2013-08-21 | 2013-11-27 | 深圳市超纯环保股份有限公司 | Terephthalic acid purification method |
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| CN103408421A (en) * | 2013-08-21 | 2013-11-27 | 深圳市超纯环保股份有限公司 | Terephthalic acid purification method |
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| 杨祖荣等: "《化工原理》", 30 September 2004 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109119713A (en) * | 2018-08-24 | 2019-01-01 | 广西师范大学 | A kind of method of positive active material in recycling lithium ion battery |
| CN109119713B (en) * | 2018-08-24 | 2020-07-31 | 广西师范大学 | Method for recovering positive active material in lithium ion battery |
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