CN110615494B - Post-treatment device and method for complex DMF wastewater after DMF recovery - Google Patents
Post-treatment device and method for complex DMF wastewater after DMF recovery Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims abstract description 122
- 238000005192 partition Methods 0.000 claims abstract description 40
- 125000002147 dimethylamino group Chemical class [H]C([H])([H])N(*)C([H])([H])[H] 0.000 claims abstract description 39
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 35
- 238000004064 recycling Methods 0.000 claims abstract description 15
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 8
- 239000003085 diluting agent Substances 0.000 claims abstract description 7
- 239000003973 paint Substances 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims description 92
- 150000001412 amines Chemical class 0.000 claims description 70
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 63
- 238000007670 refining Methods 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 239000002253 acid Substances 0.000 claims description 32
- 239000008213 purified water Substances 0.000 claims description 29
- 239000012266 salt solution Substances 0.000 claims description 20
- 238000000926 separation method Methods 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000012808 vapor phase Substances 0.000 claims description 4
- 238000009834 vaporization Methods 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 238000001035 drying Methods 0.000 description 15
- 239000000243 solution Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 239000002649 leather substitute Substances 0.000 description 8
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 150000001348 alkyl chlorides Chemical class 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 150000002576 ketones Chemical class 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 238000002306 biochemical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- QKIUAMUSENSFQQ-UHFFFAOYSA-N dimethylazanide Chemical compound C[N-]C QKIUAMUSENSFQQ-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- KNKRKFALVUDBJE-UHFFFAOYSA-N 1,2-dichloropropane Chemical compound CC(Cl)CCl KNKRKFALVUDBJE-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- GSNUFIFRDBKVIE-UHFFFAOYSA-N DMF Natural products CC1=CC=C(C)O1 GSNUFIFRDBKVIE-UHFFFAOYSA-N 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- -1 amine salt Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-M hexanoate Chemical compound CCCCCC([O-])=O FUZZWVXGSFPDMH-UHFFFAOYSA-M 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/86—Separation
-
- 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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/38—Polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Physical Water Treatments (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention belongs to the field of wastewater treatment, and relates to a post-treatment device and a post-treatment method for complex DMF wastewater after DMF recovery, which are used for treating the wastewater after DMF recovery, and dimethylamine and other VOCs are respectively recovered by arranging a stripping tower unit and a light component treatment unit, so that the recycling of all light components is realized, dimethylamine is prepared into dimethylamine salt, the dimethylamine salt is directly used as a product or used for preparing dimethylamine, other VOCs can be recycled to a tanning link to be used as an auxiliary agent, and also can be used as a paint diluent, and the resource waste is avoided; meanwhile, energy-saving means such as heat pump rectification and a partition wall rectification tower are used, so that the energy consumption of a post-treatment process is effectively reduced, the number of equipment and the occupied area are reduced, and the method has good economical efficiency.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and relates to a post-treatment device and method for complex DMF wastewater after DMF recovery.
Background
Polyurethane (PU) synthetic leather is an important component of the plastic industry, and is widely used in various industries of national economy, and the application field of the Polyurethane (PU) synthetic leather is spread over the aspects of daily life of people. The production of synthetic leather generally adopts polyurethane as basic raw materials of a base layer and a surface layer, and is prepared by solution polymerization with N, N-Dimethylamide (DMF) and the like as main solvents, and the production process is divided into a wet process and a dry process. A large amount of DMF wastewater is generated in the production process of the synthetic leather. In the wet process, DMF is mainly separated out from resin in a water washing link and is dissolved in water to form DMF wastewater; in the dry process, DMF is volatilized from the resin mainly in the form of gas and DMF waste water is formed by spraying and cooling treatment. DMF is biotoxic and difficult to biodegrade, causing serious pollution to the atmosphere and water. In order to eliminate the influence of DMF wastewater on the environment and also to reduce the production cost, the DMF wastewater needs to be recycled.
At present, DMF in wastewater is usually recovered by a rectification method. During the rectification process, DMF may hydrolyze to produce dimethylamine. After DMF in the wastewater is recovered, dimethylamine is also contained in the wastewater, so that ammonia nitrogen exceeds standard and cannot be directly discharged. The treatment method of dimethylamine in the prior art can be divided into harmless treatment and resource treatment. The harmless treatment method mainly comprises an incineration method and a biochemical method. In the prior art, dimethylamine is firstly converted into amine salt, and dimethylamine gas is blown out under alkaline condition after being treated by a nanofiltration device, and then enters an incinerator for incineration. Meanwhile, ammonia nitrogen in the wastewater is blown out under alkaline conditions, and the ammonia nitrogen is converted into nitrate nitrogen through an aerobic tank after entering a hydrolytic acidification tank for homogenization adjustment, and is then converted into nitrogen through treatment of an anoxic tank. The recycling treatment method mainly comprises a chemical method, after dimethylamine gas is blown out under alkaline conditions, preparing an industrial dimethylamine aqueous solution product through water absorption, or preparing dimethylamine salt solution through acid absorption, and then distilling and drying the dimethylamine salt solution for recycling.
The treatment object of the technology is usually DMF wastewater generated in a synthetic leather wet process, and after DMF in the wastewater is recovered, the light component in the wastewater is mainly dimethylamine. In the dry process of synthetic leather, DMF is volatilized from resin mainly in a gas form, and DMF wastewater is formed through spraying and cooling treatment, and various Volatile Organic Compounds (VOCs) waste gases are washed down together during spraying and water washing, such as alcohols, ketones, esters, chloroalkanes, aromatic hydrocarbons and other auxiliary agents used in the synthetic leather generating link, so that the DMF wastewater has complex components. In the prior art, DMF and water are used as absorption solvents, secondary absorption treatment is carried out on tail gas of a dry process, and the obtained solution is subjected to vacuum evaporation treatment, so that organic components such as toluene, butanone and the like in the solution are recovered for recycling. The tail gas mainly aims at the tail gas on the dry process production line, mainly comprises DMF, toluene and butanone, and does not contain dimethylamine.
When DMF waste water generated by a dry process or mixed waste water of a wet process and a dry process is treated, after DMF in the waste water is recovered, the waste water also contains dimethylamine generated by decomposition in the DMF recovery process and other VOCs brought in the waste water of the dry process. The prior art is directed to wastewater containing dimethylamine alone or wastewater containing other VOCs, and no corresponding treatment method exists for wastewater containing dimethylamine and other VOCs at the same time. If the existing dimethylamine treatment technology is adopted for treatment, the incineration method and the biochemical method can carry out innocent treatment on dimethylamine and other VOCs together, but the dimethylamine and the VOCs cannot be recycled, so that the resource waste is caused, and the development requirement of recycling economy is not met. When dimethylamine is blown out from wastewater in a chemical method, other VOCs are blown out simultaneously and mixed in the dimethylamine, and if water is used for absorption, the VOCs are not separated and cannot be prepared into industrial dimethylamine aqueous solution products meeting the standard; if acid is used for absorbing dimethylamine salt solution, then the dimethylamine salt solution is distilled and dried and then recovered, VOCs can escape in the links of distillation, drying and the like, and become tail gas to enter the atmosphere. The emission of VOCs in the tail gas is formulated into strict requirements by the combined printing of the ecological environment department and the national market supervision and administration of the "emission control Standard of volatile organic compounds", so that the treatment method for preparing the dimethylamine salt is not applicable any more. If other methods of treating VOCs are used, dimethylamine becomes mixed with the recovered VOCs, resulting in a failure to recycle.
By combining the analysis, the prior art cannot meet the requirements of recycling dimethylamine and other VOCs after recovering DMF from complex DMF wastewater. In addition, when dimethylamine is treated, dimethylamine needs to be blown out from wastewater, and the prior art needs to use raw steam for heating in the link, so that the problem of high energy consumption exists. Therefore, there is a need for a method for recycling dimethylamine and other VOCs in DMF wastewater while effectively reducing the energy consumption of the treatment.
Disclosure of Invention
In view of the above, the invention aims to provide a post-treatment device and a post-treatment method for recovering DMF from complex DMF wastewater, which solve the problems that dimethylamine and other VOCs cannot be treated in a recycling way and the treatment energy consumption is high in the prior art when DMF is recovered from complex DMF wastewater.
In order to achieve the above purpose, the present invention provides the following technical solutions: the post-treatment device is used for treating the wastewater after DMF recovery and comprises a stripper unit for introducing the wastewater and a light component treatment unit communicated with the stripper unit;
the stripping tower unit comprises a stripping tower, a wastewater inlet arranged on the stripping tower and communicated with wastewater, and a stripping tower external pipeline arranged on the stripping tower, wherein the stripping tower external pipeline is connected with a stripping tower reboiler, the stripping tower reboiler is communicated with the stripping tower and provided with a first stripping tower reflux branch and a second stripping tower reflux branch, the first stripping tower reflux branch and the second stripping tower reflux branch respectively reflux to the stripping tower, and the stripping tower is also communicated with a light component compressor which is communicated with the stripping tower reboiler;
the light component treatment unit is communicated with the stripping tower unit through a stripping tower reboiler and is used for treating dimethylamine and other VOCs.
Optionally, the light component treatment unit comprises a partition wall tower, a first condenser is arranged on one side of the partition wall tower, which is close to the stripping tower, and a second condenser is symmetrically arranged on one side of the first condenser, which is far away from the stripping tower, on the partition wall tower;
the first condenser is respectively communicated with a first partition wall tower outer pipeline and a first partition wall tower reflux branch, and the second condenser is respectively communicated with a second partition wall tower outer pipeline and a second partition wall tower reflux branch; the first dividing wall tower reflux branch and the second dividing wall tower reflux branch are both communicated to the dividing wall tower;
the partition wall tower is also provided with a third partition wall tower outer pipeline and a third partition wall tower reflux branch, and the third partition wall tower reflux branch is communicated with the partition wall tower; and the third dividing wall tower outer exhaust pipeline is also communicated with a dividing wall tower reboiler, and the dividing wall tower reboiler is communicated with the dividing wall tower.
Optionally, a first acid liquor pipeline is arranged on the reflux branch of the third dividing wall tower.
Optionally, the light component treatment unit comprises an amine removing tower and a light component refining tower communicated with the amine removing tower;
one end of the amine removing tower is communicated with an amine removing tower condenser which is respectively communicated with the light component refining tower and the reflux to the amine removing tower; the system comprises an amine removal tower, an amine removal tower condenser, an amine removal tower external pipeline, an amine removal tower reboiler, an amine removal tower reflux branch and an amine removal tower reflux branch, wherein the amine removal tower external pipeline is respectively communicated with the amine removal tower reboiler and the amine removal tower reflux branch;
one end of the light component refining tower is provided with a light component refining tower condenser which is respectively communicated with a first light component refining tower exhaust pipeline and a light component refining tower reflux branch, and the light component refining tower reflux branch is communicated with the light component refining tower; the light component refining tower is further communicated with a second light component refining tower outer exhaust pipeline at one end far away from the light component refining tower condenser, the second light component refining tower outer exhaust pipeline is communicated with a light component refining tower reboiler, and the light component refining tower reboiler is communicated to the light component refining tower.
Optionally, a second acid liquor pipeline is arranged on the reflux branch of the amine removal tower.
The post-treatment method for the complex DMF wastewater after DMF recovery, which is applied to the post-treatment device for the complex DMF wastewater after DMF recovery, comprises the following steps:
and (3) rectifying by a stripping tower heat pump: introducing the wastewater after DMF recovery into a stripping tower, rectifying and separating to obtain purified water meeting the emission standard at the bottom of the stripping tower, wherein a part of the purified water enters a reboiler of the stripping tower, and returning the part of the purified water to the stripping tower after partial vaporization, and the rest part of purified water is extracted and recycled to a tanning link; the mixed steam of light component and water is obtained at the top of the stripping tower, the heat is supplied to the reboiler of the stripping tower after the temperature of the steam is increased by the compression of the light component compressor, the condensate obtained after the partial condensation of the mixed steam flows back to the stripping tower, and the uncondensed vapor phase enters the light component treatment unit.
Dimethylamine treatment: adding acid into the light component treatment unit, and fixing dimethylamine in the light component treatment unit to generate dimethylamine salt; after rectification treatment, the light component treatment unit obtains dimethylamine salt solution, a part of the dimethylamine salt solution is used as a circulating material, the light component treatment unit returns after acid is added, and the rest part of the dimethylamine salt solution is extracted and can be used as dimethylamine salt product after evaporation and drying or used as raw material for preparing dimethylamine;
refining the light components: the light component treatment unit is subjected to rectification separation to obtain a light component enrichment liquid and purified water, and the light component enrichment liquid is extracted to be used as a product and reused in a tanning link to be used as an auxiliary agent or used as a paint diluent; purified water is extracted and recycled to a tanning link.
Optionally, the operation temperature of the stripping tower is 80-120 ℃, the operation pressure is 0.1-0.2 MPa (absolute pressure), and the reflux ratio of the top of the tower is 1-10.
Optionally, the acid added in the dimethylamine treatment step is hydrochloric acid or sulfuric acid, and the concentration is 5% -30%.
Optionally, alkali liquor is added into the stripping tower or the feeding wastewater before the step of 'stripping tower heat pump rectification', so that the wastewater entering the stripping tower during fluctuation of working conditions is prevented from further containing a small amount of DMF, and purified water discharged from the bottom of the stripping tower is prevented from reaching the standard.
Optionally, the added alkali liquor is sodium hydroxide aqueous solution, and the concentration is 5% -32%.
The invention has the beneficial effects that:
1. according to the post-treatment device and the post-treatment method for the complex DMF wastewater after DMF recovery, dimethylamine and other VOCs are respectively recovered, so that the recycling of all light components is realized, dimethylamine is prepared into dimethylamine salt, the dimethylamine salt is directly used as a product or used for preparing dimethylamine, other VOCs can be recycled to a tanning link to be used as an auxiliary agent, and also can be used as a paint diluent, so that the resource waste is avoided;
2. according to the post-treatment device and method for the complex DMF wastewater after DMF recovery, the heat pump rectification is adopted, the low-grade heat energy at the top of the stripping tower is converted into high-grade heat energy, heat is supplied to the reboiler of the stripping tower, the heat is reasonably utilized, the stripping tower does not need to externally provide raw steam, the process energy consumption is greatly reduced, the purposes of saving energy and reducing consumption are achieved, meanwhile, the requirement for circulating cooling water is correspondingly reduced, the maximum saving of heat energy is realized, in addition, the condenser at the top of the tower is reduced, and the equipment investment is also reduced;
3. according to the post-treatment device and the post-treatment method for the complex DMF wastewater after DMF recovery, the steam at the top of the stripping tower is partially condensed, and light components such as dimethylamine and other VOCs directly enter the light component treatment unit in a steam state, so that the heat exchange effect of a reboiler of the stripping tower can be ensured, the load of the reboiler of the light component treatment unit can be reduced, the use of raw steam is reduced, and the purposes of energy conservation and consumption reduction are achieved;
4. the post-treatment device and the post-treatment method for the complex DMF wastewater after DMF recovery have good stripping effect, and the treated purified water reaches the discharge standard and can be recycled to the tanning link, so that the waste of water resources is avoided;
5. according to the post-treatment device and method for the complex DMF wastewater after DMF recovery, the separation wall tower is adopted, the reaction of dimethylamine and acid and the rectification separation of dimethylamine salt, water and other VOCs are realized in one tower device, the number and cost of the devices are reduced, the land resource requirement is saved, meanwhile, the energy-saving effect is generated because the thermodynamic effect of the rectification process is improved, and the heat energy recycling inside the separation wall rectification tower is realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram showing the overall structure of an embodiment 1 of a post-treatment apparatus and method for recovering DMF from complex DMF wastewater according to the present invention;
FIG. 2 is a schematic diagram showing the overall structure of an embodiment 2 of the post-treatment apparatus and method for recovering DMF from complex DMF wastewater according to the present invention.
Reference numerals: the stripping column 1, the waste water feed inlet 2, the stripping column discharge line 3, the stripping column reboiler 4, the first stripping column reflux branch 5, the second stripping column reflux branch 6, the light component compressor 7, the dividing wall column 8, the first condenser 9, the second condenser 10, the first dividing wall column discharge line 11, the first dividing wall column reflux branch 12, the second dividing wall column discharge line 13, the second dividing wall column reflux branch 14, the third dividing wall column discharge line 15, the third dividing wall column reflux branch 16, the dividing wall column reboiler 17, the first acid liquid line 18, the amine removal column 19, the amine removal column condenser 20, the amine removal column discharge line 21, the amine removal column reboiler 22, the amine removal column reflux branch 23, the light component purification column 24, the light component purification column condenser 25, the first light component purification column discharge line 26, the light component purification column reflux branch 27, the second light component purification column discharge line 28, the light component purification column reboiler 29, and the second acid liquid line 30.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
Referring to fig. 1, the post-treatment device is used for treating the wastewater after recovering DMF and comprises a stripper unit for introducing wastewater and a light component treatment unit communicated with the stripper unit; the stripping tower unit comprises a stripping tower 1, a waste water feeding port 2 which is arranged on the stripping tower 1 and communicated with waste water, and a stripping tower discharging pipeline 3 which is arranged at the bottom of the stripping tower 1, wherein a stripping tower reboiler 4 is connected to the stripping tower discharging pipeline 3, the stripping tower reboiler 4 is communicated with the stripping tower 1 and is provided with a first stripping tower reflux branch 5 and a second stripping tower reflux branch 6, the first stripping tower reflux branch 5 and the second stripping tower reflux branch 6 respectively reflux to the stripping tower 1, the top of the stripping tower 1 is also communicated with a light component compressor 7, and the light component compressor 7 is communicated with the stripping tower reboiler 4; the light component treatment unit is communicated with the stripping tower unit through a stripping tower reboiler 4 and is used for treating dimethylamine and other VOCs.
The light component treatment unit comprises a partition wall tower 8, wherein a first condenser 9 is arranged at the top of one side of the partition wall tower 8 close to the stripping tower 1, and a second condenser 10 is symmetrically arranged at the top of one side of the partition wall tower 8 far from the stripping tower 1; the first condenser 9 is respectively communicated with a first partition wall tower external discharge pipeline 11 and a first partition wall tower reflux branch 12, and the second condenser 10 is respectively communicated with a second partition wall tower external discharge pipeline 13 and a second partition wall tower reflux branch 14; the first divided wall column reflux branch 12 and the second divided wall column reflux branch 14 are both communicated to the divided wall column 8; the dividing wall tower 8 is also provided with a third dividing wall tower outer pipeline 15 and a third dividing wall tower reflux branch 16, and the third dividing wall tower reflux branch 16 is communicated with the dividing wall tower 8; the third dividing wall tower outer pipe 15 is also communicated with a dividing wall tower reboiler 17, the dividing wall tower reboiler 17 is communicated with the dividing wall tower 8, and the third dividing wall tower reflux branch 16 is provided with a first acid liquor pipe 18.
The wastewater after DMF recovery is introduced into a stripping tower 1 from a wastewater feed inlet 2 in the middle of the stripping tower 1, purified water meeting emission standards is obtained at the bottom of the stripping tower 1 after rectification and separation, one part of the purified water enters a stripping tower reboiler 4, the other part of the purified water is returned to the stripping tower 1 through a first stripping tower reflux branch 5 after partial vaporization, and the other part of the purified water is extracted through a stripping tower discharge pipeline 3 and can be recycled to a tanning link; the mixed steam of light components and water is obtained at the top of the stripping tower 1, the mixed steam is compressed by a light component compressor 7 to raise the steam temperature and then is introduced into a stripping tower reboiler 4 to supply heat for the stripping tower reboiler 4, condensate obtained after the mixed steam is partially condensed is refluxed to the stripping tower 1 through a second stripping tower reflux branch 6, and uncondensed vapor phase is introduced into a dividing wall tower 8 of a shared stripping section.
Acid is added to the divided wall column 8 to fix dimethylamine in the vapor, thereby producing dimethylamine salt. The light component steam is obtained from the top of the tower at one side close to the stripping tower 1 through the rectification separation of the partition wall tower 8, the light component enrichment liquid is obtained after condensation of the light component steam by the first condenser 9, one part of the light component enrichment liquid flows back to the partition wall tower 8 through the first partition wall tower reflux branch 12, and the other part of the light component enrichment liquid is extracted through the first partition wall tower discharge pipeline 11 to be used as a product, can be recycled to a tanning link to be used as an auxiliary agent and also can be used as a paint diluent; the water vapor is obtained from the tower top at the other side of the dividing wall tower 8, and after being condensed by the second condenser 10, one part of the water vapor flows back to the dividing wall tower 8 through the second dividing wall tower reflux branch 14, and the other part of the water vapor is extracted through the second dividing wall tower discharge pipeline 13 and can be recycled to the tanning link; a dimethylamine salt solution is obtained at the bottom of the tower, part of the dimethylamine salt solution enters a partition wall tower reboiler 17 to be partially vaporized and then returns to the partition wall tower 8, part of the dimethylamine salt solution is used as a circulating material, acid is added through a first acid liquid pipeline 18 and then returns to the partition wall tower 8 from the middle upper part of the partition wall tower 8 through a third partition wall tower reflux branch 16, and part of the dimethylamine salt solution is extracted through a third partition wall tower discharge pipeline 15, so that the dimethylamine salt solution can be used as a dimethylamine salt product after evaporation and drying, and the dimethylamine salt solution can also be used as a raw material for preparing dimethylamine.
In this embodiment, the main components of the raw material wastewater are water, dimethylamine, and one or more of alcohols, ketones, esters, chloroalkanes, and aromatics.
In this example, the stripper 1 is operated at a temperature of 80 to 120℃and at a pressure of 0.1 to 0.2MPa (absolute), with a reflux ratio at the top of the column of 1 to 10.
In this example, the dividing wall column 8 was operated at a temperature of 80 to 140℃and at an operating pressure of 0.1 to 0.15MPa (absolute), with the feed having a top reflux ratio of 0.3 to 4 on one side and a top reflux ratio of 0.2 to 3 on the other side.
In this example, the acid added to the dividing wall column 8 is hydrochloric acid or sulfuric acid, and the concentration is 5% to 30%.
The same separation task is accomplished with the same theoretical plate count for dividing wall column 8 in separating the 3-component mixture, and the dividing wall column 8 requires less reboiling heat and condensation than a conventional two column process. For certain given materials, compared with the conventional rectifying tower, the separating wall rectifying tower needs smaller reflux ratio, so that the operation capacity is increased, the energy conservation can be up to more than 60%, and the equipment investment is saved by 30%.
Experimental data 1:
the raw material wastewater comprises the following components:
water: 99.66% w, dimethylamine 0.11% w, acetone 0.05% w, butanone 0.05% w, ethyl acetate 0.06% w, dichloroethane 0.02% w, dichloropropane 0.02% w, xylene 0.03% w.
The operation temperature of the stripping tower 1 is 90-105 ℃, the operation pressure is 0.1-0.11 MPa (absolute pressure), and the reflux ratio of the top of the tower is 9.65.
The operating temperature of the dividing wall column 8 is 100-130 ℃, the operating pressure is 0.1-0.11 MPa (absolute pressure), the reflux ratio of the top of the column at one side of the feeding is 0.3, and the reflux ratio of the top of the column at the other side is 1.
The acid added to the dividing wall column 8 was sulfuric acid at a concentration of 5%.
Experimental data 2:
the raw material wastewater comprises the following components:
water: 95.81% w, dimethylamine 3.61% w, methyl formate 0.58% w.
The operation temperature of the stripping tower 1 is 85-102 ℃, the operation pressure is 0.1-0.12 MPa (absolute pressure), and the reflux ratio of the top of the tower is 5.3.
The operating temperature of the dividing wall column 8 is 90-140 ℃, the operating pressure is 0.1-0.11 MPa (absolute pressure), the reflux ratio of the top of the column at one side of the feeding is 1.5, and the reflux ratio of the top of the column at the other side is 2.
The acid added to the dividing wall column 8 was hydrochloric acid at a concentration of 15%.
Purified water after the experimental treatment reaches the discharge standard; the purity of dimethylamine salt prepared by drying is more than or equal to 99 percent, and the organic matter content of the recovered VOCs solution is more than or equal to 99 percent.
Example 2
Referring to fig. 2, the difference from embodiment 1 is that the light component treating unit is an amine removing tower 19 and a light component refining tower 24 connected to the amine removing tower 19; the top of the amine removing tower 19 is communicated with an amine removing tower condenser 20, and the amine removing tower condenser 20 is respectively communicated with a light component refining tower 24 and a reflux to the amine removing tower 19; the bottom of the amine removal tower 19 is also provided with an amine removal tower external exhaust pipeline 21, and the amine removal tower external exhaust pipeline 21 is respectively communicated with an amine removal tower reboiler 22 and an amine removal tower reflux branch 23, wherein the amine removal tower reboiler 22 is communicated to the amine removal tower 19, and the amine removal tower reflux branch 23 reflows to the amine removal tower 19; a light component refining tower condenser 25 is arranged at the top of the light component refining tower 24, the light component refining tower condenser 25 is respectively communicated with a first light component refining tower outer exhaust pipeline 26 and a light component refining tower reflux branch 27, and the light component refining tower reflux branch 27 is communicated to the light component refining tower 24; the bottom of the light component refining tower 24 is also communicated with a second light component refining tower external pipeline 28, the second light component refining tower external pipeline 28 is communicated with a light component refining tower reboiler 29, and the light component refining tower reboiler 29 is communicated with the light component refining tower 24; a second acid liquor pipeline 30 is arranged on the amine removal tower reflux branch 23.
The vapor phase which is not condensed in the stripper reboiler 4 enters an amine removal column 19; acid is added to the amine removal column 19 to fix dimethylamine in the column to form dimethylamine salt. After rectifying treatment of the amine removing tower 19, a dimethylamine salt solution is obtained at the bottom of the amine removing tower 19, a part of the dimethylamine salt solution enters an amine removing tower reboiler 22 to be partially vaporized and then returns to the amine removing tower 19, a part of the dimethylamine salt solution is used as a circulating material, acid is added through a second acid liquid pipeline 30 and then returns to the amine removing tower 19 from the middle upper part of the amine removing tower 19 through an amine removing tower reflux branch 23, and a part of the dimethylamine salt solution is extracted through an amine removing tower discharge pipeline 21, can be used as a dimethylamine salt product after being evaporated and dried, and can also be used as a raw material for preparing dimethylamine. The mixed steam of light components and water is obtained from the top of the amine removing tower 19, part of the mixed steam is condensed by the amine removing tower condenser 20 and then flows back to the amine removing tower 19, and the other part of the mixed steam is introduced into the light component refining tower 24.
The mixed solution of the light component and the water is rectified and separated by a light component refining tower 24, light component steam is obtained at the tower top, the light component steam is condensed by a light component refining tower condenser 25 to obtain a light component enrichment solution, a part of the light component enrichment solution is refluxed to the light component refining tower 24 by a light component refining tower reflux branch 27, and the other part of the light component enrichment solution is extracted by a first light component refining tower external discharge pipeline 26 to be used as a product, can be recycled to a tanning link to be used as an auxiliary agent and also can be used as a paint diluent; purified water meeting the emission standard is obtained at the bottom of the tower, one part of the purified water enters a reboiler 29 of the light component refining tower, the light component refining tower 24 returns after partial vaporization, and the other part of the purified water is extracted through an outer exhaust pipeline 28 of the second light component refining tower and can be recycled to a tanning link.
In this embodiment, the main components of the raw material wastewater are water, dimethylamine, and one or more of alcohols, ketones, esters, chloroalkanes, and aromatics.
In this example, the stripper 1 is operated at a temperature of 80 to 120℃and at a pressure of 0.1 to 0.2MPa (absolute), with a reflux ratio at the top of the column of 1 to 10.
In this example, the operation temperature of the amine removal column 19 is 80 to 140 ℃, the operation pressure is 0.1 to 0.15MPa (absolute), and the overhead reflux ratio is 0.3 to 5.
In this example, the light component refining column 24 is operated at a temperature of 40 to 120℃and at an operating pressure of 0.1 to 0.2MPa (absolute), and the reflux ratio at the top of the column is 0.2 to 4.
In this embodiment, the acid added to the amine removal tower 19 is hydrochloric acid or sulfuric acid, and the concentration is 5% -30%.
Experimental data:
the raw material wastewater comprises the following components:
water: 97.45% w, 1.70% w dimethylamine, 0.24% w butyl acetate, 0.55% w methanol, 0.02% w ethylbenzene and 0.04% w xylene.
The operation temperature of the stripping tower 1 is 88-104 ℃, the operation pressure is 0.1-0.11 MPa (absolute pressure), and the reflux ratio of the top of the tower is 6.
The operation temperature of the amine removing tower 19 is 90-130 ℃, the operation pressure is 0.1-0.11 MPa (absolute pressure), and the reflux ratio of the tower top is 1.5.
The operating temperature of the light component refining tower 24 is 60-105 ℃, the operating pressure is 0.1-0.12 MPa (absolute pressure), and the reflux ratio of the tower top is 0.5.
The acid added to the amine removal column 19 was sulfuric acid at a concentration of 10%.
Purified water after the experimental treatment reaches the discharge standard; the purity of dimethylamine salt prepared by drying is more than or equal to 99 percent, and the organic matter content of the recovered VOCs solution is more than or equal to 99 percent.
In the invention, in order to ensure that the wastewater treated by the stripping tower 1 reaches the discharge standard, and prevent that a small amount of DMF is also contained in the wastewater entering the stripping tower 1 when the working condition fluctuates, so that the purified water discharged from the bottom of the stripping tower 1 does not reach the standard, an alkali liquor feeding port can be added at the upper part of the stripping tower 1 or on a wastewater feeding pipeline. DMF in the wastewater reacts with alkali to generate dimethylamine and formate, the dimethylamine rises after rectification treatment of the stripping tower 1, and enters a subsequent rectifying tower for treatment together with other light components, and the formate enters purified water and is extracted from the bottom of the tower. The extracted purified water is recycled after PH is regulated by adding acid.
The alkali liquor is sodium hydroxide aqueous solution with the concentration of 5-32%. The acid used is the same as the acid added in the amine removal column 19. The adding amount of alkali liquor is determined by the PH of the tower kettle, and the PH of the tower kettle is controlled to be 9-12.
The technical scheme provided by the invention meets the post-treatment requirement of the complex DMF wastewater after DMF recovery, solves the problem that the prior art can only treat wastewater containing dimethylamine or VOCs (volatile organic compounds) only in a synthetic leather dry process, and realizes the recycling of all light components; meanwhile, energy-saving means such as heat pump rectification and a partition wall rectification tower are used, so that the energy consumption of a post-treatment process is effectively reduced, the number of equipment and the occupied area are reduced, and the method has good economical efficiency.
According to the invention, dimethylamine and other VOCs are respectively recovered, so that the recycling of all light components is realized, dimethylamine salt is prepared from dimethylamine, and the dimethylamine salt is directly used as a product or used for preparing dimethylamine, and other VOCs can be recycled to a tanning link to be used as an auxiliary agent or used as a paint diluent, so that the resource waste is avoided;
the invention adopts the heat pump rectification to convert the low-grade heat energy at the top of the stripping tower into high-grade heat energy, supplies heat for the reboiler of the stripping tower, reasonably utilizes the heat, ensures that the stripping tower does not need to provide raw steam outside, greatly reduces the energy consumption of the process, achieves the purposes of saving energy and reducing consumption, simultaneously correspondingly reduces the requirement of circulating cooling water, realizes the maximum saving of heat energy, reduces the condenser at the top of the tower, and reduces the equipment investment;
according to the invention, steam at the top of the stripping tower is partially condensed, and light components such as dimethylamine and other VOCs directly enter the light component treatment unit in a vapor state, so that the heat exchange effect of a reboiler of the stripping tower can be ensured, the load of the reboiler of the light component treatment unit can be reduced, the use of raw steam is reduced, and the purposes of energy conservation and consumption reduction are achieved;
the invention has good stripping effect, the treated purified water reaches the discharge standard, and the purified water is recycled to the tanning link, thereby avoiding the waste of water resources;
the invention adopts the partition wall tower, realizes the reaction of dimethylamine and acid and the rectification separation of dimethylamine salt, water and other VOCs in one tower device, reduces the number and cost of the devices, saves the land resource requirement, simultaneously generates the energy-saving effect because the thermodynamic effect of the rectification process is improved, and realizes the heat energy recycling in the partition wall rectification tower.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (9)
1. Post-treatment device after complicated DMF waste water retrieves DMF for waste water after handling and retrieving DMF, its characterized in that: comprises a stripping tower unit for introducing wastewater and a light component treatment unit communicated with the stripping tower unit;
the stripping tower unit comprises a stripping tower, a wastewater inlet which is arranged on the stripping tower and communicated with wastewater, and a stripping tower exhaust pipeline which is arranged on the stripping tower, wherein a stripping tower reboiler is connected on the stripping tower exhaust pipeline, the stripping tower reboiler is communicated with the stripping tower and is provided with a first stripping tower reflux branch and a second stripping tower reflux branch, the first stripping tower reflux branch and the second stripping tower reflux branch respectively reflux to the stripping tower, and a light component compressor is also communicated on the stripping tower and is communicated with the stripping tower reboiler;
the light component treatment unit is communicated with the stripping tower unit through a stripping tower reboiler and is used for treating dimethylamine and other VOCs;
the light component treatment unit comprises a partition wall tower, a first condenser is arranged on one side of the partition wall tower, which is close to the stripping tower, and second condensers are symmetrically arranged on the partition wall tower on one side of the first condenser, which is far away from the stripping tower;
the first condenser is respectively communicated with a first partition wall tower outer pipeline and a first partition wall tower reflux branch, and the second condenser is respectively communicated with a second partition wall tower outer pipeline and a second partition wall tower reflux branch; the first dividing wall tower reflux branch and the second dividing wall tower reflux branch are both communicated to the dividing wall tower;
the separation wall tower is also provided with a third separation wall tower outer pipeline and a third separation wall tower reflux branch, and the third separation wall tower reflux branch is communicated with the separation wall tower; and the third dividing wall tower outer exhaust pipeline is also communicated with a dividing wall tower reboiler, and the dividing wall tower reboiler is communicated with the dividing wall tower.
2. The post-treatment device for recycling DMF from complex DMF wastewater according to claim 1, wherein the post-treatment device comprises: and a first acid liquor pipeline is arranged on the reflux branch of the third dividing wall tower.
3. Post-treatment device after complicated DMF waste water retrieves DMF for waste water after handling and retrieving DMF, its characterized in that: comprises a stripping tower unit for introducing wastewater and a light component treatment unit communicated with the stripping tower unit;
the stripping tower unit comprises a stripping tower, a wastewater inlet which is arranged on the stripping tower and communicated with wastewater, and a stripping tower exhaust pipeline which is arranged on the stripping tower, wherein a stripping tower reboiler is connected on the stripping tower exhaust pipeline, the stripping tower reboiler is communicated with the stripping tower and is provided with a first stripping tower reflux branch and a second stripping tower reflux branch, the first stripping tower reflux branch and the second stripping tower reflux branch respectively reflux to the stripping tower, and a light component compressor is also communicated on the stripping tower and is communicated with the stripping tower reboiler;
the light component treatment unit is communicated with the stripping tower unit through a stripping tower reboiler and is used for treating dimethylamine and other VOCs;
the light component treatment unit comprises an amine removal tower and a light component refining tower communicated with the amine removal tower;
one end of the amine removing tower is communicated with an amine removing tower condenser which is respectively communicated with the light component refining tower and the reflux amine removing tower; the one end of the amine removal tower far away from the amine removal tower condenser is also provided with an amine removal tower exhaust pipeline, the amine removal tower exhaust pipeline is respectively communicated with an amine removal tower reboiler and an amine removal tower reflux branch, the amine removal tower reboiler is communicated to the amine removal tower, and the amine removal tower reflux branch is refluxed to the amine removal tower;
one end of the light component refining tower is provided with a light component refining tower condenser which is respectively communicated with a first light component refining tower exhaust pipeline and a light component refining tower reflux branch, and the light component refining tower reflux branch is communicated with the light component refining tower; the light component refining tower is characterized in that one end far away from the condenser of the light component refining tower is also communicated with a second light component refining tower outer exhaust pipeline, the second light component refining tower outer exhaust pipeline is communicated with a light component refining tower reboiler, and the light component refining tower reboiler is communicated to the light component refining tower.
4. A post-treatment device for recycling DMF from complex DMF waste water according to claim 3, wherein: and a second acid liquor pipeline is arranged on the reflux branch of the amine removal tower.
5. The post-treatment method for the complex DMF wastewater after DMF recovery, which is applied to the post-treatment device for the complex DMF wastewater after DMF recovery according to any one of claims 1 to 4, is characterized by comprising the following steps:
and (3) rectifying by a stripping tower heat pump: introducing the wastewater after DMF recovery into a stripping tower, rectifying and separating to obtain purified water meeting the emission standard at the bottom of the stripping tower, wherein a part of the purified water enters a reboiler of the stripping tower, and returning the part of the purified water to the stripping tower after partial vaporization, and the rest part of purified water is extracted and recycled to a tanning link; the mixed steam of light components and water is obtained at the top of the stripping tower, the heat is supplied to a reboiler of the stripping tower after the temperature of the steam is increased by compression of a light component compressor, condensate obtained after the mixed steam is partially condensed flows back to the stripping tower, and uncondensed vapor phase enters a light component treatment unit;
dimethylamine treatment: adding acid into the light component treatment unit, and fixing dimethylamine in the light component treatment unit to generate dimethylamine salt; after rectification treatment, a part of dimethylamine salt solution is obtained by the light component treatment unit, and after acid is added, the part of dimethylamine salt solution returns to the light component treatment unit, and the rest part of dimethylamine salt solution is extracted, evaporated and dried to be used as dimethylamine salt product or used as raw material for preparing dimethylamine;
refining the light components: the light component treatment unit is subjected to rectification separation to obtain light component enrichment liquid and purified water, the light component enrichment liquid is taken as a product and recycled to the tanning link as an auxiliary agent or used as a paint diluent, and the purified water is taken and recycled to the tanning link.
6. The post-treatment method for the complex DMF wastewater after DMF recovery according to claim 5, wherein the post-treatment method comprises the following steps: the operation temperature of the stripping tower is 80-120 ℃, the operation pressure is 0.1-0.2 MPa, and the reflux ratio of the top of the stripping tower is 1-10.
7. The post-treatment method for the complex DMF wastewater after DMF recovery according to claim 5, wherein the post-treatment method comprises the following steps: the acid added in the dimethylamine treatment step is hydrochloric acid or sulfuric acid, and the concentration is 5% -30%.
8. The post-treatment method for the complex DMF wastewater after DMF recovery according to claim 5, wherein the post-treatment method comprises the following steps: alkali liquor is added into the stripping tower before the step of 'heat pump rectification of the stripping tower', so that the waste water entering the stripping tower during fluctuation of working conditions is prevented from further containing a small amount of DMF, and purified water discharged from the bottom of the stripping tower does not reach the standard.
9. The post-treatment method for the complex DMF wastewater after DMF recovery according to claim 8, wherein the post-treatment method comprises the following steps: the added alkali liquor is sodium hydroxide aqueous solution, and the concentration is 5% -32%.
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