CN106745623A - The preparation and its application of COD macromolecule organic flocculating agents in a kind of reduction coating waste-water - Google Patents
The preparation and its application of COD macromolecule organic flocculating agents in a kind of reduction coating waste-water Download PDFInfo
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- CN106745623A CN106745623A CN201611238854.9A CN201611238854A CN106745623A CN 106745623 A CN106745623 A CN 106745623A CN 201611238854 A CN201611238854 A CN 201611238854A CN 106745623 A CN106745623 A CN 106745623A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of preparation and its application of the organic polymer coargulator for reducing COD contents in coating waste-water; with benzyltriethylammoinium chloride cationic monomer and diethyl malonate as primary raw material; using azodiisobutyronitrile initiator; 7~8h of polymerisation under nitrogen protective condition; the product that reaction is obtained is through N; N dimethylformamides are precipitated, and vacuum drying constant weight obtains flocculant product.When using, in being the coating waste-water of 70000~80000mg/L by flocculant addition COD contents, meanwhile, add 100~300mg/L aluminum sulfate, stirring, quiescent setting to reach more than 89.5% through COD clearances in processed waste water.When flocculant of the invention is with aluminum sulfate compounding use, there is good linear relationship between solubility and dissolution time and viscosity and COD clearances, compared with other high polymer coagulants, with pH value wide ranges, salt-resistance is good, and flocculation rate is fast, flocculating effect is good, suitable for the Pollution System that zwitterion coexists, the COD contents in waste water are significantly reduced, be used widely in the fields such as feedwater, wastewater treatment, sludge dewatering.
Description
Technical field
The present invention relates to a kind of synthesis technique of new macromolecule organic flocculating agent agent, it is mainly used in reduction waste water
COD, belong to technical field of chemistry.
Background technology
Water is Source of life, is on the rise in face of water pollution, the shortage of water resource, forces people to focus more on water resource
Protection, the emission treatment of waste water and reuse.In the treatment technology of waste water, flocculent precipitation is most widely used, most economical, most
Important method, and flocculant is the core of flocculence water technology.
Flocculation can be removed effectively in 80% -95% suspended material, 65% -95% colloidal substance and reduction water
COD ；Different types of flocculant COD in waste water is reduced has different action values.Inorganic polymeric aluminium class flocculant exists
During optimal basicity, the speed that floccule body is produced is fast, and particle is big, and precipitability is good, removes COD effects substantially, but active aluminium toxicity
It is too big；Activated silica acids flocculant sources are wide, cheap, nontoxic and flocculation, effect of flocculant are good, removal COD effects preferably,
Due to easily voluntarily polycondensation separate out gel and inactivate can only matching while using, precise control its degree of polymerization is difficult aborning, it is difficult to reach
To optimal flocculating effect, its application is limited；Natural macromolecule flocculating agent raw material sources are abundant, selectivity is big, dosage is few, peace
The remarkable advantage such as Atoxic, cheap, fully biodegradable, contains various active groups, such as hydroxyl, phenolic hydroxyl group, tool
There is more active chemical property, by chemical modification, greatly increase active group, disperseed flocculation group, to suspension system
Middle particulate matter has stronger seizure and promotees heavy effect, but unobvious to the removal effect of COD；Organic polymer coargulator due to
Its consumption is few, and flocculation rate is fast, is influenceed small by salt, sewage PH and temperature coexists, generation sludge quantity is few and receive much concern,
Very big effect is played to using water wisely, reinforcing water treatment and the reclamation rate for improving water, most widely used flocculant is poly-
Acrylamide (PAM) class and its modification derivant, the monomer residue of polymerisation cannot be avoided, and PAM monomers have poison in itself
Property and " three cause " effect.
Current industrial production organic polymer coargulator generally uses emulsion, inversed emulsion polymerization, and both all use poisonous
There is environmental pollution in organic solvent, production process, therefore, find that security is higher, nontoxic or raw material of low toxicity, explore new
Organic polymer coargulator and green polymerization, are urgent problems for reducing the COD in waste water.
Cationic poly amine flocculant is relatively low one kind of price in organic polymer coargulator, is had in water process
Very big application value.Thoughtful life etc. presses treatment every time using polyacrylamide (PAM) and NaOH treatment indigo dyeing waste water
Water is configured, and achieves good effect.Dong Yinmao etc. is main reactant with epoxychloropropane, ammoniacal liquor, dimethylamine, is introduced
The additive of functional group and charge density can be changed, polyamine class HA series flocculants are have developed, dyeing and weaving waste water is processed,
The clearance of COD be 64%, if with inorganic flocculating agent compounding use, it is better.Ruan Xu Li etc. pass through epoxide amination
Method be obtained cationic flocculant, process dyeing waste water, reduce the COD and colourity in waste water, effect is significant.Yan Sheng
Text etc. carries out wastewater treatment using first addition polyacrylamide and inorganic flocculating agent G409, is then processed using electrolysis, water outlet
Up to discharging standards.
Paracyanogen series polymeric flocculant also has excellent effect to COD in waste water.Wang Yan etc. is with polyacrylonitrile as high
Strand, with the nitrile-group modification on double nitrile diamines and polyacrylonitrile macromolecular.The polymer containing various active group is obtained
PAN-DCD, studies its treatment to reactive dye and the waste water of acid dyes, and Primary Study shows the effect of its removal COD
It is obvious.The polyampholyte PAN-DCD and PAN-DCD-HY of the various active group that China's magnitude high synthesizes and
Cationic polyelectrolyte FA-2# is decolourized to waste water and the removal of COD carries out effect assessment, and COD clearances reach
70%.
From the point of view of the current present Research of flocculant both at home and abroad, have at aspects such as kind, performance, process, costs
Further research is treated, however, flocculant is less than 80% to the clearance of COD in waste water, is not met by requiring, particularly
COD contents are excessive in coating waste-water, reach 70000-80000mg/L, use organic amphiprotic polymeric flocculant, flocculation rate
Hurry up, particle is big, and the sludge quantity of generation is few, to the decolorizing effect of waste water very well, but to the clearance of COD in the waste water 60%
Left and right, does not meet wastewater discharge standard.Thus, a kind of single-minded, high selectivity flocculant is developed, especially to the difference of water body
PH values scope, different chemical oxygen consumption (COC) (COD) flocculating effects substantially, improve the clearance of COD in waste water, with important meaning
Justice.
The content of the invention
It is not high to the clearance of COD in waste water that the purpose of the present invention is directed to existing flocculant, and provides a kind of being applicable
The novel high polymer flocculant of the COD contents in coating waste-water is reduced, with benzyltriethylammoinium chloride cationic monomer and third
Diethyl adipate is primary raw material, and using azodiisobutyronitrile, the organic flocculant for preparing is applicable not only to anions and canons
The Pollution System for coexisting, pH wide ranges, salt-resistance is good, and flocculating effect is splendid, and for sludge of different nature, with compared with
Good dehydration filtrating aid function, it is important to which the COD clearances in coating waste-water can reach more than 89.5%.
The specific synthesis step of organic polymer coargulator of the invention is：(1) by rough benzyltriethylammoinium chloride
Vacuum distillation is carried out in alkaline NaOH environment, pH=7.0~7.5 of distillate, filtering is controlled, and inhaled with activated carbon
Attached, filtering is decolourized；(2) the benzyltriethylammoinium chloride 10g after purification is taken, is placed in conical flask, be diluted with water to 50mL, plus
Enter 3% 1~5mL of acetum, 8% aluminum trichloride solution 1~5mL, pH control is in 5.0~5.5, water-bath temperature
Degree control is added dropwise the carbonic allyl ester solution of excessive 0.1mol/L at 65 DEG C~75 DEG C, constantly shakes conical flask, makes precipitation
React uniform, be cooled to room temperature, after 12h, precipitation is carried out into decompression suction filtration, vacuum drying is precipitated to constant weight, and determine it and contain
Amount；(3) benzyltriethylammoinium chloride cationic monomer, additive, the deionized water of 80mL for refining 6~8g, load
In the four-neck flask of 250mL, vacuumize repeatedly 3 times, and use nitrogen protection device, be stirred continuously；(4) when temperature is raised to 45
DEG C when, the diethyl malonate that will be pre-mixed, initiator are continuously and stably instilled in flask by constant pressure funnel, reaction
After 2h, 80 DEG C are warming up to, continue to react 5~7 hours, the liquid in having flask is sticky, is cooled to room temperature, discharging；
(5) N, N- dimethylformamides is used to precipitate the polymerization product, vacuum drying sediment to constant weight, you can.
The method that the present invention uses emulsion polymerization, it is 30% that benzyltriethylammoinium chloride cationic monomer is made into concentration
~80% aqueous solution, using anionic monomer diethyl malonate, and uses azodiisobutyronitrile initiator system.Initiator
Consumption for reactant gross mass 1%~5%, it is 2.0%~3.0% to be preferably controlled in, polymerization time be 7.0h~
8.0h。
The organic polymer coargulator that the present invention is prepared, outward appearance be white plates or crystalline powder, in aqueous
Dissolution time is less than 0.5h, and solubility is 98%, and cationic degree is more than 90%, and its mean molecule quantity reaches 6.48 × 104, and weight is equal
Relative molecular mass reaches 5.7 × 104, and the profile exponent of copolymer is 4.26, and solution viscosity is more than 10000mpa.s.
The organic polymer coargulator that the present invention is prepared and COD phases in other high polymer coagulants treatment waste water
Than having the special feature that is：(1) Pollution System coexisted suitable for zwitterion；(2) applicable pH value wide ranges, salt-resistance
It is good, it is adaptable to which that the sewage of different pollution levels, flocculating effect is splendid；Suspension preferably in removal waste water, is effectively reduced
COD contents in waste water, in its waste water the clearance of COD is up to more than 89.5%.
Specific embodiment
The organic polymer coargulator that the present invention is prepared is used to reduce the COD contents in waste water, can preferably go
Except the suspension in waste water, the COD in removal sewage extensively should be obtained in the fields such as feedwater, wastewater treatment, sludge dewatering
With.
The present invention using emulsion polymerization method, by benzyltriethylammoinium chloride cationic monomer be made into concentration for 30%~
80% aqueous solution, using anionic monomer diethyl malonate, and uses polyacrylamide initiator system.Initiator amount
It is the 1%~5% of reactant gross mass, it is 2.0%~3.0% to be preferably controlled in, polymerization time is 7.0h~8.0h.
Synthesis step and methods for using them is now illustrated by instantiation.
Benzyltriethylammoinium chloride cationic monomer, additive, the deionized water of 80mL that example 1 refines 7g, dress
Enter in the four-neck flask of 250mL, vacuumize repeatedly 3 times, and use nitrogen protection device, be stirred continuously.When temperature is raised to 45 DEG C
When, the diethyl malonate that will be pre-mixed, polyacrylamide initiator continuously and stably instill burning by constant pressure funnel
In bottle, after reaction 2h, 80 DEG C are warming up to, continue to react 6 hours, the liquid in having flask is sticky, is cooled to room temperature, goes out
Material.With N, N- dimethylformamides precipitate the polymerization product, and vacuum drying sediment is weighed to constant weight.
Prepare 2000mL waste water (COD contents reach 70000-80000mg/L), add the wadding of the above-mentioned synthesis of 40mg/L
Solidifying agent, adds the aluminum sulfate of 100mg/L, and 12h is stood after stirring, and then removes supernatant, according to GB11914-89, uses
Potassium dichromate method carries out the measure of COD COD, then careful to take out flco, and flco is contained with the beaker of constant weight, claims
Its quality, flco reuse.
It is above-mentioned test result indicate that：The obtained flocculant of 40mg/L, flocculating effect is added preferably, to measure going for COD
Except rate is 89.5%.
Benzyltriethylammoinium chloride cationic monomer, additive, the deionized water of 80mL that example 2 refines 7g, dress
Enter in the four-neck flask of 250mL, vacuumize repeatedly 3 times, and use nitrogen protection device, be stirred continuously.When temperature is raised to 45 DEG C
When, the diethyl malonate that will be pre-mixed, polyacrylamide initiator continuously and stably instill burning by constant pressure funnel
In bottle, after reaction 2h, 80 DEG C are warming up to, continue to react 6 hours, the liquid in having flask is sticky, is cooled to room temperature, goes out
Material.With N, N- dimethylformamides precipitate the polymerization product, and vacuum drying sediment is weighed to constant weight.
Prepare 2000mL waste water (COD contents reach 70000-80000mg/L), add the wadding of the above-mentioned synthesis of 50mg/L
Solidifying agent, adds the aluminum sulfate of 100mg/L, and 12h is stood after stirring, and then removes supernatant, according to GB11914-89, uses
Potassium dichromate method carries out the measure of COD COD, then careful to take out flco, and flco is contained with the beaker of constant weight, claims
Its quality, flco reuse.
It is above-mentioned test result indicate that：Adding the obtained flocculant of 50mg/L, flocculating effect increases, and measures going for COD
Except rate is 90.4%.
Benzyltriethylammoinium chloride cationic monomer, additive, the deionized water of 80mL that example 3 refines 7g, dress
Enter in the four-neck flask of 250mL, vacuumize repeatedly 3 times, and use nitrogen protection device, be stirred continuously.When temperature is raised to 45 DEG C
When, the diethyl malonate that will be pre-mixed, polyacrylamide initiator continuously and stably instill burning by constant pressure funnel
In bottle, after reaction 2h, 80 DEG C are warming up to, continue to react 6 hours, the liquid in having flask is sticky, is cooled to room temperature, goes out
Material.With N, N- dimethylformamides precipitate the polymerization product, and vacuum drying sediment is weighed to constant weight.
Prepare 2000mL waste water (COD contents reach 70000-80000mg/L), add the wadding of the above-mentioned synthesis of 60mg/L
Solidifying agent, adds the aluminum sulfate of 100mg/L, and 12h is stood after stirring, and then removes supernatant, according to GB11914-89, uses
Potassium dichromate method carries out the measure of COD COD, then careful to take out flco, and flco is contained with the beaker of constant weight, claims
Its quality, flco reuse.
It is above-mentioned test result indicate that：The obtained flocculant of 60mg/L, flocculating effect is added preferably, to measure going for COD
Except rate is 91.8%.
Benzyltriethylammoinium chloride cationic monomer, additive, the deionized water of 80mL that example 4 refines 7g, dress
Enter in the four-neck flask of 250mL, vacuumize repeatedly 3 times, and use nitrogen protection device, be stirred continuously.When temperature is raised to 45 DEG C
When, the diethyl malonate that will be pre-mixed, polyacrylamide initiator continuously and stably instill burning by constant pressure funnel
In bottle, after reaction 2h, 80 DEG C are warming up to, continue to react 6 hours, the liquid in having flask is sticky, is cooled to room temperature, goes out
Material.With N, N- dimethylformamides precipitate the polymerization product, and vacuum drying sediment is weighed to constant weight.
Prepare 2000mL waste water (COD contents reach 70000-80000mg/L), add the wadding of the above-mentioned synthesis of 70mg/L
Solidifying agent, adds the aluminum sulfate of 100mg/L, and 12h is stood after stirring, and then removes supernatant, according to GB11914-89, uses
Potassium dichromate method carries out the measure of COD COD, then careful to take out flco, and flco is contained with the beaker of constant weight, claims
Its quality, flco reuse.
It is above-mentioned test result indicate that：The obtained flocculant of 70mg/L, flocculating effect is added preferably, to measure going for COD
Except rate is 93.1%.
Example 5 by the benzyltriethylammoinium chloride cationic monomer of refined 7g, additive, 80mL deionized water, dress
Enter in the four-neck flask of 250mL, vacuumize repeatedly 3 times, and use nitrogen protection device, be stirred continuously.When temperature is raised to 45 DEG C
When, the diethyl malonate that will be pre-mixed, polyacrylamide initiator continuously and stably instill burning by constant pressure funnel
In bottle, after reaction 2h, 80 DEG C are warming up to, continue to react 6 hours, the liquid in having flask is sticky, is cooled to room temperature, goes out
Material.With N, N- dimethylformamides precipitate the polymerization product, and vacuum drying sediment is weighed to constant weight.
Prepare 2000mL waste water (COD contents reach 70000-80000mg/L), add the wadding of the above-mentioned synthesis of 80mg/L
Solidifying agent, adds the aluminum sulfate of 100mg/L, and 12h is stood after stirring, and then removes supernatant, according to GB11914-89, uses
Potassium dichromate method carries out the measure of COD COD, then careful to take out flco, and flco is contained with the beaker of constant weight, claims
Its quality, flco reuse.
It is above-mentioned test result indicate that：The obtained flocculant of 80mg/L, flocculating effect is added preferably, to measure going for COD
Except rate is 94.8%.
Claims (3)
1. a kind of preparation and its application for reducing COD macromolecule organic flocculating agents in coating waste-water, it is characterised in that specific to prepare
Step is：(1) rough benzyltriethylammoinium chloride is carried out into vacuum distillation in alkaline NaOH environment, control distillate
PH=7.0~7.5, filtering, and charcoal absorption is used, and filter, decolourize；(2) benzyltriethylammoinium chloride after purification is taken
10g, is placed in conical flask, is diluted with water to 50mL, adds 3% 1~5mL of acetum, 8% aluminum trichloride solution 1
5.0~5.5, bath temperature is controlled at 65 DEG C~75 DEG C for~5mL, pH control, and the carbonic acid of excessive 0.1mol/L is added dropwise
Propylene ester solution, constantly shakes conical flask, makes precipitation reaction uniform, is cooled to room temperature, after 12h, precipitation is carried out into decompression and is taken out
Filter, vacuum drying is precipitated to constant weight, and determines its content；(3) the benzyltriethylammoinium chloride cation for refining 6~8g
Monomer, additive, the deionized water of 80mL, are fitted into the four-neck flask of 250mL, vacuumize repeatedly 3 times, and protected with nitrogen
Protection unit, is stirred continuously；(4) when temperature is raised to 45 DEG C, diethyl malonate, the initiator that will be pre-mixed are by constant pressure
Dropping funel is continuously and stably instilled in flask, after reaction 2h, is warming up to 80 DEG C, continues to react 5~7 hours, Zhi Daoyou
Liquid in flask is sticky, is cooled to room temperature, discharging；(5) N, N- dimethylformamides is used to precipitate the polymerization product, vacuum is done
Dry sediment is to constant weight, you can.
2. in a kind of reduction waste water according to claim 1 COD organic flocculants preparation and its application, its feature exists
Initiator system in step (4) polymerization process is azodiisobutyronitrile.
3. a kind of preparation and its application for reducing COD macromolecule organic flocculating agents in coating waste-water, it is characterised in that：The flocculation
Agent is used cooperatively with aluminum sulfate, better.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115028288A (en) * | 2022-06-30 | 2022-09-09 | 四川农业大学 | Self-separation hydrophilic and hydrophobic regulating and controlling flocculant and application thereof |
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2016
- 2016-12-28 CN CN201611238854.9A patent/CN106745623A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115028288A (en) * | 2022-06-30 | 2022-09-09 | 四川农业大学 | Self-separation hydrophilic and hydrophobic regulating and controlling flocculant and application thereof |
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