CN115945493A - Method for treating dinitrotoluene waste residue - Google Patents
Method for treating dinitrotoluene waste residue Download PDFInfo
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- CN115945493A CN115945493A CN202211260024.1A CN202211260024A CN115945493A CN 115945493 A CN115945493 A CN 115945493A CN 202211260024 A CN202211260024 A CN 202211260024A CN 115945493 A CN115945493 A CN 115945493A
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- dinitrotoluene
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- DYSXLQBUUOPLBB-UHFFFAOYSA-N 2,3-dinitrotoluene Chemical compound CC1=CC=CC([N+]([O-])=O)=C1[N+]([O-])=O DYSXLQBUUOPLBB-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000002699 waste material Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 239000003054 catalyst Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 239000007800 oxidant agent Substances 0.000 claims abstract description 18
- 230000001590 oxidative effect Effects 0.000 claims abstract description 18
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 30
- 239000002910 solid waste Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 9
- 229910052723 transition metal Inorganic materials 0.000 claims description 8
- 150000003624 transition metals Chemical class 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003570 air Substances 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- VMMLSJNPNVTYMN-UHFFFAOYSA-N dinitromethylbenzene Chemical group [O-][N+](=O)C([N+]([O-])=O)C1=CC=CC=C1 VMMLSJNPNVTYMN-UHFFFAOYSA-N 0.000 claims 3
- 238000010008 shearing Methods 0.000 claims 1
- 201000004428 dysembryoplastic neuroepithelial tumor Diseases 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000010802 sludge Substances 0.000 abstract description 2
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 43
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 18
- 150000001875 compounds Chemical class 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 238000000197 pyrolysis Methods 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- -1 are flammable Substances 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 4
- 239000010808 liquid waste Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000007353 oxidative pyrolysis Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- 229940098779 methanesulfonic acid Drugs 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
- HOYRZHJJAHRMLL-UHFFFAOYSA-N 2,6-dinitro-p-cresol Chemical compound CC1=CC([N+]([O-])=O)=C(O)C([N+]([O-])=O)=C1 HOYRZHJJAHRMLL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000009284 supercritical water oxidation Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to the field of solid waste treatment, in particular to a treatment method of dinitrotoluene waste residue. Uniformly dispersing the DNT waste residue into water to form uniform DNT waste liquid, adjusting the pH value of the waste liquid to acidity, then feeding the waste liquid into a high-pressure reaction kettle, adjusting the temperature of the waste liquid to 130-180 ℃, adding a catalyst and an oxidant at high temperature, and reacting for 10-180min at 0.2-2MPa to convert dinitrotoluene in the waste residue into a dissolved state, thereby removing the dinitrotoluene. According to the invention, the DNT waste residue as the raw material is uniformly dispersed in water, and then the waste liquid containing non-dissolved DNT is treated, so that mass transfer and heat transfer are promoted, further, the DNT waste residue is prevented from being directly oxidized to release a large amount of heat in a centralized manner, and the safety of the disposal process is ensured; the disposal process is not limited by non-dissolved DNT and does not produce chemical sludge.
Description
The application is a divisional application of Chinese patent application, the original application date is 26/11/2020, and the application numbers are as follows: 202011346780.7, inventive name: a method for treating dinitrotoluene waste residue, which is disclosed as follows: CN112496004A; the applicant filed a divisional application.
Technical Field
The invention relates to the field of solid waste treatment, in particular to a method for treating dinitrotoluene waste residue.
Background
The toluene nitration is that toluene reacts with nitric acid in the presence of sulfuric acid to generate Dinitrotoluene (DNT), inorganic acid and alkali are removed by washing, and organic matters such as dinitro p-cresol and the like are removed by washing to obtain a dinitrotoluene product. In the course of the dinitrotoluene preparation and the polishing washing, large amounts of DNT-rich waste water are produced. DNT wastewater can be divided into yellow water and red water according to the characteristics of the contaminants contained therein. The yellow water is an aqueous yellow solution produced upon washing acidic DNT, is strongly acidic, and contains sulfuric acid, nitric acid and DNT. Red water is alkaline waste water generated in the process of refining DNT, and has high organic matter concentration, high toxicity and difficult treatment. Most of the pollutants in DNT wastewater contain nitro groups, are difficult to biodegrade or not, and have great toxicity to human and animals.
The DNT wastewater generated in the DNT production process is obviously different from the conventional wastewater containing nitrobenzene, and has the outstanding characteristics of large pH difference of the DNT wastewater (the pH of yellow water is less than 1, and the pH of red water is more than 10), high organic matter content (the organic matter content is 0.2-0.8%), high DNT content (300-5000 mg/L), high sulfate radical content (2000-20000 mg/L), high nitrate radical content (20000-60000 mg/L), high biological toxicity and large water quality fluctuation; the more prominent difference is that the DNT production wastewater contains non-soluble DNT and soluble DNT, the water temperature is higher (higher than 70 ℃), the DNT solidifying point (about 70 ℃) is higher than normal temperature, and when the wastewater disturbance is lower and the water temperature is lower than the solidifying point, the soluble DNT in the wastewater is separated and precipitated, and the precipitate is paraffin-shaped. The precipitate and the wastewater are two-phase, sticky, easy to attach, difficult to clean, flammable and explosive, and long-term residue has potential negative effects on a pretreatment device or a pretreatment reaction process. Therefore, when DNT wastewater treatment is carried out, the conventional method is to cool the wastewater, precipitate DNT-containing waste residues and then carry out subsequent treatment on the wastewater. However, the precipitated waste residues are hazardous wastes, are rich in DNT, contain other impurities, are flammable, explosive and highly toxic, and are difficult to store, outsource, dispose and recycle.
After sufficient settling, the concentration of DNT (both soluble and non-soluble DNT) in the process wastewater was greatly reduced from several thousand mg/L. The actual concentration of DNT in the wastewater after settling is related to pH, temperature and pressure: under normal temperature, normal pressure and neutral conditions, the concentration of DNT in the wastewater can be dissolved by about 400 mg/L; under alkaline conditions, at higher temperatures (e.g., above 70 ℃), and under pressure (e.g., 4 atmospheres), the soluble DNTs in the wastewater can be increased (around 1200 mg/L), but the solubility is still low.
Dinitrotoluene (DNT) and Nitrobenzene (NB) are two different chemicals, DNT has one more nitro and one more methyl group on the benzene ring, is more toxic and more difficult to degrade. In the prior art, there are few methods for the treatment of DNT waste residues, and there are many references on the treatment of Nitrobenzene (NB) waste water, but few references on the treatment of dinitrotoluene DNT waste water, mainly as follows:
CN102649597B (oxidative pyrolysis process of dinitrotoluene wastewater) discloses an oxidative pyrolysis process of dinitrotoluene wastewater, which comprises the following steps: and discharging the wastewater from the washing kettle through a buffer tank, a settling tank, a preheater, a high-pressure pump, a pyrolysis pre-heat exchanger, a pyrolysis hot oil heat exchanger, a pyrolysis reactor, a pyrolysis cooler and the buffer tank, wherein an oxidant is added at an inlet of the settling tank and/or the pyrolysis pre-heat exchanger, and is added by pressurization when the oxidant is added into the pyrolysis pre-heat exchanger. The process comprises the steps of firstly cooling and settling DNT in the wastewater, separating DNT-rich precipitate, reducing DNT content of the wastewater to enable DNT and the wastewater to be in a homogeneous phase state, and then carrying out oxidative pyrolysis on the wastewater under an alkaline condition.
Treating DNT wastewater by supercritical Water oxidation (Water environmental Research,2010,65 (3): 250-257), cooling and crystallizing the wastewater at 15 ℃, and then adopting O to treat the DNT wastewater with 346mg/L of DNT 2 And H 2 O 2 As oxidant, supercritical reaction is carried out at 250-500 deg.c and the reaction pressure reaches 140-310 bar. The method needs to firstly cool and settle DNT in the wastewater to obtain DNT-rich precipitate, reduce DNT content in the wastewater, and then remove DNT in a wastewater homogeneous phase by adopting a supercritical reaction, and the reaction temperature and pressure are harsh.
CN100518859C (a method for degrading nitrobenzene pollutants by a catalytic wet-type co-oxidation method), adding a co-oxidation substance and a catalyst into a high-pressure reaction kettle containing nitrobenzene pollutant waste liquid, wherein the mass concentration ratio of the co-oxidation substance to the treated organic pollutants is 0.1-20, oxygen or air is used as an oxidant, the reaction temperature is 100-250 ℃, the reaction pressure is 0.5-10 MPa, and the oxygen partial pressure is 0.2-5 MPa. The concentration of nitrobenzene treated by the process is low, and the key point of the process is to add a large amount of co-oxidation substances (organic matters), however, the load of subsequent treatment is increased; in addition, the removal of nitrobenzene is relatively low, in particular the removal of dinitrotoluene.
CN102276046B (method for treating various organic pollutants in industrial wastewater by using a green wet oxidation method) adds a hydrazine hydrate catalyst into a reaction kettle, and then fills oxygen with pressure of 0.2-1.2 MPa; stirring and reacting at the reaction temperature of 70-300 ℃, the reaction pressure of 0.1-5 Mpa and the oxygen partial pressure of 0.1-3 Mpa for 30 minutes-8 hours; the results show that there is some removal of DNT, but the removal rate is much lower than other refractory compounds. This indicates that this method may not be effective in removing DNT from wastewater.
All of the above methods treat DNT soluble in wastewater and the concentration of DNT in wastewater is also low. However, the above methods are not suitable for treating the waste residue precipitated from DNT wastewater, and because the DNT waste residue is a hazardous waste, is rich in DNT, contains other impurities, is flammable, explosive and highly toxic, and is difficult to store, export, dispose and recycle, mainly characterized in that: DNT waste residues contain a large amount of impurities and are difficult to purify; if the DNT is treated as hazardous waste, DNT is flammable and explosive, the safety risk of the treatment process is very high, and almost no hazardous waste treatment enterprises are willing to accept the DNT; if the DNT is accumulated in a production area, the DNT is exposed to safety risks such as explosion and the like. Meanwhile, the waste residue is paraffin-shaped, the adhesion is strong, the properties of the waste residue settled in different time periods are different, and the waste residue is not uniform, so that a method for safely treating DNT waste residue is very necessary to be developed.
Disclosure of Invention
The invention aims to provide a treatment method capable of safely treating dinitrotoluene waste residue.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for treating dinitrotoluene waste residue comprises the steps of uniformly dispersing the DNT waste residue into water to form uniform DNT waste liquid, adjusting the pH of the waste liquid to acidity (preferably pH is not higher than 4, and more preferably pH is 3-3.5), then feeding the waste liquid into a high-pressure reaction kettle, adjusting the temperature of the waste liquid to 130-180 ℃ (preferably 145-165 ℃), adding a catalyst and an oxidant at high temperature, and reacting for 10-180min at 0.2-2MPa (preferably 0.5-1.2 MPa), so that dinitrotoluene in the waste residue is converted into a dissolved state, and further removing the dinitrotoluene.
The catalyst is a catalyst A, or a catalyst A and a catalyst B, wherein the catalyst A is a soluble catalyst containing transition metal or/and a supported catalyst containing the transition metal as an active component; the catalyst B contains-SO 3 H group compounds.
The transition metal contained in the catalyst A is preferably one or more of Fe, cu, zn and Mn, and more preferably Fe and Cu; the transition metal being present in the form of a transition metal salt, e.g. FeSO 4 、CuSO 4 、MnSO 4 And the like.
The dosage of the soluble catalyst A is 0.05-1mmol, preferably 0.1-0.2 mmol, added in each liter of DNT waste liquid, and the adding position is an inlet of a reaction kettle;
the load type catalyst A is filled in the reaction kettle, and the filling amount of the load type catalyst A is 5-30% of the internal volume of the reaction kettle;
the catalyst B is added in an amount of 0-20 mmol, preferably 0.05-10 mmol, more preferably 0.1-3 mmol, per liter of DNT waste liquid, and the adding position is an inlet of the reaction kettle; when non-soluble DNT is not present, catalyst B may not be added.
Said compound containing-SO 3 The compound of the H group is sulfonic acid or sulfonate; preferably methanesulfonic acid and/or a salt of methanesulfonic acid.
The oxidant is one or more of air, oxygen and hydrogen peroxide, and hydrogen peroxide is preferred; the addition amount of the additive is 5-30% of the wastewater (calculated by oxygen when the oxidant is air or oxygen, and H when the oxidant is hydrogen peroxide) 2 O 2 Calculated by 30 percent of hydrogen peroxide; the same applies below).
When the DNT content in the DNT forming waste liquid is 1000-2000mg/L, the adding amount of hydrogen peroxide (calculated by mass concentration of 30%) is 5-8% of the amount of waste water; when the DNT content in the waste liquid is 2000-5000mg/L, the adding amount of hydrogen peroxide (calculated by mass concentration of 30%) is 8-15% of the amount of the waste water; when the DNT content in the waste liquid is more than 5000mg/L, the adding amount of hydrogen peroxide (calculated by mass concentration of 30%) is 15-30% of the amount of the waste water.
The uniform DNT waste liquid is obtained by uniformly dispersing solid waste residues into water; or the solid waste residue is converted into liquid waste residue liquid, and then the liquid waste residue liquid is uniformly dispersed into water.
The solid waste residue is uniformly dispersed in water, the solid waste residue and the water are mixed, stirred under the condition of isolating oxygen, and sheared under the condition of external force, so that the particle size of waste residue particles reaches 0-1 mm, and the waste residue particles are uniformly suspended in the water to form turbid liquid.
The solid waste residue is converted into liquid waste residue liquid, the solid waste residue is heated and melted into liquid, and the liquid waste residue is preferably melted at 75-85 ℃ in an air-isolated manner; then uniformly dispersing the waste residue liquid into water to prepare an emulsion;
the uniform dispersion means that the DNT contained in each cubic centimeter of DNT waste liquid has the same mass;
the uniform dispersion means comprises one or more modes of stirring, heating, adjusting the pH value of the system, adding an emulsifier and the like, so that solid waste residues or waste residue liquid after being converted into liquid are dispersed into water;
the oxygen isolation can adopt various forms such as inert gas protection, water sealing, oil sealing, mechanical sealing after oxygen removal and the like;
the stirring can adopt the modes of mechanical stirring, hydraulic stirring, jet stirring, gas stirring and the like.
The DNT in the waste residue is removed by the method, the waste residue is uniformly dispersed in water, so that on one hand, the contact area of the waste residue with a catalyst and an oxidant can be increased, the mass transfer rate is increased, the reaction time is shortened, the heat generated by the reaction is uniformly distributed in a system, and the local overheating is avoided; on the other hand, the method avoids the phenomenon that a large amount of DNT waste residues are directly oxidized to intensively release a large amount of heat to be out of control, thereby being beneficial to controlling the reaction process. Under the conditions of high temperature and high pressure, (1) passing SO in the catalyst B in the system 3 Reacting H with DNT to promote DNT to form soluble compounds; the catalyst A catalyzes hydrogen peroxide to form hydroxyl radical OH; attack of hydroxyl radical-SO 3 H and DNT form soluble compound to generate small molecular organic matter and CO 2 、H 2 O, with simultaneous release of-SO 3 A H group; -SO 3 Reacting H with DNT repeatedly, thereby rapidly converting the insoluble DNT into the soluble DNT; or (2) the catalyst A catalyzes the reaction of hydroxyl radicals OH formed by hydrogen peroxide and soluble DNT to reduce the soluble DNT, so that the insoluble DNT is quickly converted into the soluble DNT, and the steps are repeated.
The invention has the following advantages:
according to the invention, the DNT waste residue as the raw material is uniformly dispersed in water, and then the waste liquid containing non-dissolved DNT is treated, so that mass transfer and heat transfer are promoted, further, the DNT waste residue is prevented from being directly oxidized to release a large amount of heat in a centralized manner, and the safety of the disposal process is ensured; the disposal process is not limited by non-dissolved DNT, and chemical sludge is not generated;
the specific catalyst is added in the treatment process of the invention to promote DNT to form soluble compounds, the reaction conditions are relatively mild, the DNT removal efficiency is high, and the DNT removal rate in the wastewater reaches more than 99%.
And the method can realize self-sufficiency of heat in the reaction system under proper conditions without external heating.
Detailed Description
The following examples are presented to further illustrate embodiments of the present invention, and it should be understood that the embodiments described herein are for purposes of illustration and explanation only and are not intended to be limiting.
Examples
Taking a certain amount of DNT waste residues, putting the DNT waste residues into water under the condition of isolating oxygen, quickly stirring and uniformly mixing to prepare DNT suspension; or heating the solid waste slag to 75-85 ℃ to melt the solid waste slag in an air-isolated manner, and then mixing the solid waste slag with water to rapidly stir the mixture to form emulsion; adjusting the pH of a waste liquid system, then sending the waste liquid containing non-soluble DNT into a high-pressure reaction kettle, adjusting the temperature of the waste liquid to be not lower than 130 ℃, contacting the waste liquid with a catalyst A or a catalyst A and a catalyst B, and then adding a certain amount of hydrogen peroxide (H) according to the volume percentage of the DNT waste liquid 2 O 2 Hydrogen peroxide with the mass concentration of 30 percent) and reacts at 0.2 to 2MPa, and the results are shown in table 1.
The DNT waste residue is a precipitate obtained after wastewater generated in the production of dinitrotoluene is treated according to a conventional mode.
TABLE 1
Note that: mmol/L refers to the amount of catalyst A (or catalyst B) dosed per liter of waste liquor.
Note: the adding amount of the oxidant refers to the mass ratio of the oxidant to the waste liquid. When the oxidant is air or oxygen, the oxygen is measured; when the oxidant is hydrogen peroxide, H is used 2 O 2 Calculated by 30 percent of hydrogen peroxide.
As can be seen from table 1, the raw material waste residue is dispersed in water to form a waste liquid containing non-soluble DNT, so that the contact area between the waste residue and the catalyst and the oxidant is increased, the mass transfer is increased, the reaction time is shortened, the heat generated by the reaction is uniformly distributed in the system, and the local overheating is avoided; meanwhile, the phenomenon that a large amount of DNT waste residues are directly oxidized to release a large amount of heat in a centralized manner to be out of control is avoided, so that the reaction process is favorably controlled. Then under the condition of high temperature and high pressure, under the condition of containing-SO 3 H which reacts with DNT in the presence of a catalyst which promotes DNT to form soluble compounds; simultaneously, the other catalyst catalyzes hydrogen peroxide to form hydroxyl radical OH; attack of hydroxyl radical-SO 3 H and DNT form soluble compound to generate small molecular organic matter and CO 2 、H 2 O, with simultaneous release of-SO 3 A H group; -SO 3 H reacts with DNT again, and the reaction is repeated, so that waste residues are treated, and the DNT removal rate effect is obvious; meanwhile, the method can be used for treating the DNT-containing wastewater, and also has a remarkable treatment effect.
Claims (8)
1. A method for treating dinitrotoluene waste residue is characterized by comprising the following steps: uniformly dispersing DNT waste residues into water to form uniform DNT waste liquid, adjusting the pH value of the waste liquid to acidity, then feeding the waste liquid into a high-pressure reaction kettle, adjusting the temperature of the waste liquid to 130-180 ℃, adding a catalyst and an oxidant at high temperature, and reacting for 10-180min at 0.2-2MPa, so that dinitrotoluene in the waste residues is converted into a dissolved state, and further removed.
2. The process for treating waste dinitrotoluene residue according to claim 1, wherein: the catalyst is a catalyst A, wherein the catalyst A is a soluble catalyst containing transition metal or/and a supported catalyst containing the transition metal as an active component.
3. The method for treating dinitrotoluene waste residue according to claim 2, wherein: the using amount of the soluble catalyst A is 0.05-1mmol added in each liter of DNT waste liquid; the loading amount of the supported catalyst A is 5-30% of the internal volume of the reaction kettle.
4. The method for treating dinitrotoluene waste residue according to claim 2, wherein: the transition metal is one or more of Fe, cu, zn or Mn.
5. The process for treating waste dinitrotoluene residue according to claim 1, wherein: the oxidant is one or more of air, oxygen and hydrogen peroxide, and the addition amount of the oxidant is 5-30% of the mass of the DNT waste liquid.
6. The method for treating dinitrotoluene waste residue according to claim 1, wherein: the uniform DNT waste liquid is obtained by uniformly dispersing solid waste residues into water; or the solid waste residue is converted into liquid state and then uniformly dispersed in water.
7. The process for treating waste dinitrotoluene residue according to claim 6, wherein: the solid waste residue is uniformly dispersed in water by mixing the solid waste residue with water, stirring under the condition of isolating oxygen, and shearing the waste residue under the condition of external force to ensure that the particle size of waste residue particles reaches 0-1 mm, so that the waste residue particles are uniformly suspended in the water to form turbid liquid.
8. The method for treating dinitrotoluene waste residue according to claim 6, wherein: the solid waste residue is converted into liquid, namely the solid waste residue is heated and melted into liquid.
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