CN113562857B - Salt inhibitor for salt-containing wastewater back-spraying quenching tower process and use method thereof - Google Patents
Salt inhibitor for salt-containing wastewater back-spraying quenching tower process and use method thereof Download PDFInfo
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- CN113562857B CN113562857B CN202110863130.8A CN202110863130A CN113562857B CN 113562857 B CN113562857 B CN 113562857B CN 202110863130 A CN202110863130 A CN 202110863130A CN 113562857 B CN113562857 B CN 113562857B
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
Abstract
The invention provides a salt inhibitor for a salt-containing wastewater back-spraying quench tower process, which is characterized by being prepared by mixing the following components: wherein component 1 is a mixture comprising ethoxylated alkyl sulfate, long chain alkylbenzene sulfonate, p-toluene sulfonate; the component 2 is a mixture containing polyamino polyether methylene phosphonic acid sodium salt, diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt; component 3 comprises 2, 2-dibromo-3-nitrilopropionamide and polyethylene glycol silicate; wherein, the component 1: the mass ratio of the component 2 is 1-10:1, a step of; the dosage of the component 3 is 1-10 per mill of the total weight of the salt inhibitor. The salt inhibitor can form loose crystals, and has ideal salt inhibition effect.
Description
Technical Field
The invention relates to the field of salt inhibitors, in particular to a salt inhibitor for a salt-containing wastewater back-spraying quenching tower process and a use method thereof.
Background
In the alkaline tower of hazardous waste incineration engineering, sodium hydroxide solution is generally used for washing acid gases (hydrogen chloride, sulfur dioxide, hydrogen fluoride and the like) in flue gas. When the pH value of the alkaline washing liquid is reduced to about 9.0, the alkaline is added again to raise the pH value, and the alkaline washing liquid is continuously recycled. With the continued recycling, the salt content in the lye is increasing, the salt concentration can be as high as 18%, even higher. The higher and higher salt content causes the alkaline washing liquid to separate out a large amount of near-white mixed salt in the packing and the nozzle of the alkaline washing tower in the circulating process, thereby causing blockage.
In the prior art, aiming at the phenomena of precipitation of the filling materials and the nozzles of the alkaline washing tower, most of the existing products are salt inhibition by mixing a scale inhibitor for circulating water with ferrocyanide, the solubility of ion concentration in water is increased, and the ferrocyanide salt is added on the basis of the salt inhibition to change the crystal shape, so that the purpose of salt inhibition is achieved.
However, the salt inhibitor in the current market has large dosage, and in the actual application process, when the salt content is 1%, the dosage of the salt inhibitor generally reaches the level of 200-300ppm, and the higher the salt content is, the larger the dosage is. In particular, most products containing potassium ferrocyanide as the main component are added in an amount exceeding the above-mentioned addition concentration.
Further, it was found through the study of the present invention that scale after crystallization was very stable based on the crystal form for a mixture of sulfate crystals and silica crystals. However, the existing salt inhibitor is not designed to take the problem into consideration, and no device for destroying or changing the crystal form of the crystallized salt is provided, so that the existing crystal form cannot be changed although the crystal period can be prolonged by adding the salt inhibitor, and most of crystals cannot be changed in shape after use (as shown in fig. 2). Based on the mixed salt, the cleaning is very difficult, the product is generally alkalescent, bacteria are easy to breed, the quality guarantee period is not long, and toxic and harmful substances can be generated after cyanide is added into some products at high temperature, so that secondary pollution is caused.
For example: the patent with the patent application number of CN202010506511.6 introduces a salt inhibitor, a preparation method and application thereof, and a salt inhibitor applied to hazardous waste incineration environment with the patent number of CN202011243019.0, wherein the main components of the salt inhibitor are conventional scale inhibitor raw material components, and the salt inhibitor is compounded by common scale inhibitor raw materials in the market, so that the application of the salt inhibitor is changed. The above problems remain after the product is formed.
Also for example: the patent CN202010941070.2 is a salt inhibitor prepared by mixing ferrocyanide with polymerized aspartic acid, polyepoxysuccinic acid, polyacrylate and the like, and is prepared by mixing a scale inhibitor with ferrocyanide according to a certain proportion, and although the salt property can be well changed by using the formula, toxic and harmful substances can be generated due to the high temperature of cyanide.
Disclosure of Invention
The invention aims to overcome the defects, solve the problem that the crystal form cannot be changed in the prior art by using various components capable of changing salt to analyze crystals and adopting surface active components, and preferably compound the scale inhibition components of calcium sulfate and silicon dioxide, so that the salt inhibitor with strong pertinence, high solid content, obvious salt inhibition effect, low dosage, no cyanide and long shelf life is finally formed.
The invention provides a salt inhibitor for a salt-containing wastewater back-spraying quench tower process, which is characterized by being prepared by mixing the following components:
wherein component 1 is a mixture comprising ethoxylated alkyl sulfate, long chain alkylbenzene sulfonate, p-toluene sulfonate;
the component 2 is a mixture containing polyamino polyether methylene phosphonic acid sodium salt, diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt;
component 3 comprises 2, 2-dibromo-3-nitrilopropionamide and polyethylene glycol silicate;
wherein, the component 1: the mass ratio of the component 2 is 1-10:1, a step of;
the dosage of the component 3 is 1-10 per mill of the total weight of the salt inhibitor.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the mass ratio of the ethoxylated alkyl sulfate to the long-chain alkylbenzene sulfonate to the p-toluene sulfonate is 1-5:0.5-1:1-20.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the mass ratio of the ethoxylated alkyl sulfate to the long-chain alkylbenzene sulfonate to the p-toluene sulfonate is 2-3:0.5-1:5-10.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the mass ratio of the polyamino polyether methylene phosphonic acid sodium salt to the diethylenetriamine pentamethylene phosphoric acid sodium salt to the ethylenediamine tetraacetic acid sodium salt is 5-15:4-10:1-2.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the mass ratio of the polyamino polyether methylene phosphonic acid sodium salt to the diethylenetriamine pentamethylene phosphoric acid sodium salt to the ethylenediamine tetraacetic acid sodium salt is 10-12:5-6:1-2.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the mass ratio of the component 1 to the component 2 is 2-3:1.
further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the dosage of the 2, 2-dibromo-3-nitrilopropionamide is 1/4-1/2 of that of polyethylene glycol silicate.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the long-chain alkylbenzene sulfonate is one or more selected from long-chain alkylbenzene sulfonates with 8-20 carbon atoms.
Further, the salt inhibitor for the salt-containing wastewater back-spraying quenching tower process is characterized by comprising the following components in percentage by weight: the polyethylene glycol silicate is selected from one or more of polyethylene glycol silicate with molecular weight of 400-4000.
In addition, the invention also provides a use method of the salt inhibitor for the salt-containing wastewater back-spraying quench tower process, which is characterized in that:
when the content of sulfate and silicon dioxide in the wastewater is less than 10 percent (excluding) of the total salt content, the adding amount is 50-80ppm per 1 percent of salt content;
when the sulfate and silicon dioxide in the wastewater account for 10 percent (contained) to 30 percent (not contained) of the total salt content,
the salt content is 1 percent, and the dosage is 80-150ppm;
when the sulfate and silicon dioxide in the wastewater account for more than 30 percent (inclusive) of the total salt content,
the salt content is 1% and the dosage is 150-300ppm.
The invention has the following functions and effects:
1. the component one is compounded to realize the powdering of the formed salt, and meanwhile, the gap between the powder can be increased, so that the powder is bulked.
2. Through the compounding of the component II, the crystal structure of the silicon dioxide salt and the sulfate can be effectively changed, so that the silicon dioxide salt and the sulfate are not easy to harden and are easy to fall off during cleaning.
3. The third component is well compatible with the above two components, and has the effects of preventing mildew and prolonging the effective period of the product from 1 year to 2 years.
Drawings
FIG. 1 is a state diagram before dosing;
FIG. 2 is a state diagram of the salt inhibitor of comparative example 1 after addition;
FIG. 3-1. A state diagram after addition of the salt inhibitor of example 1;
FIG. 3-2. A state diagram after addition of the salt inhibitor of example 1;
FIGS. 3-3 are state diagrams after addition of the salt inhibitor of example 1;
FIG. 4 is a state diagram of the salt inhibitor of comparative example 2 after addition;
FIG. 5 is a state diagram of the salt inhibitor of comparative example 3 after addition;
FIG. 6 is a state diagram of the salt inhibitor of comparative example 4 after addition;
fig. 7. State diagram after addition of the salt inhibitor of comparative example 5.
Detailed description of the preferred embodiments
Example 1,
The salt inhibitor provided in this example 1 was prepared as follows:
s1, configuring a component 1: sodium ethoxylation alkyl sulfate AES, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 2:0.5:5, compounding.
S2, configuring a component 2: the preparation method comprises the following steps of (1) mixing polyamino polyether methylene phosphonic acid sodium salt, diethylenetriamine pentamethylene sodium phosphate and ethylenediamine tetraacetic acid sodium salt according to a proportion of 10: and 5, compounding in a ratio of 1.
S3, mixing the component 1 with the component 2 according to the mass ratio of 2:1, adding DBPNA accounting for 1 per mill of the total weight and polyethylene glycol silicate accounting for 3 per mill of the total weight (400).
The using method comprises the following steps:
when the sulfate and the silicon dioxide in the wastewater account for 10 percent of the total salt content,
every time the salt content is 1%, the dosage is 50-80ppm, and so on;
when the sulfate and the silicon dioxide in the wastewater account for 10 to 30 percent of the total salt content,
every time the salt content is 1%, the dosage is 80-150ppm, and so on;
when the sulfate and silicon dioxide in the wastewater account for more than 30 percent of the total salt content,
every time the salt content is 1%, the dosage is 150-300ppm, and so on.
Specific use examples:
mixing sulfate and sodium silicate with different contents respectively, and preparing three wastewater samples with different compositions, namely, wastewater samples with sulfate and silicon dioxide accounting for 8%,25% and 38% of the total salt content.
The liquid medicine is added according to the rules, after the liquid medicine is fully mixed, the results after the solution is evaporated are respectively shown in the figures 3-1, 3-2 and 3-3, and the treated crystals are in a flour powder state, so that the whole is loose and soft, the separation effect is realized by lightly knocking the surface of the container, and the removal effect is excellent.
Comparative example 1
A commercially available salt inhibitor containing phosphate as a main component was used to treat 25% of waste water containing sulfate and silica of the same origin in the same manner as in example 1. The experiment was conducted based on the salt content of 1% per 1% and the dosage of 300ppm, and the results are shown in FIG. 2.
Comparative example 2
The salt inhibitor provided in the comparative example 2 is prepared as follows:
ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 2-3:0.5-1:5-10.
The experiment was conducted by taking 8%,25% and 38% of the total salt content of the sulfate and silica, respectively, and taking the 1% salt content per 1% and the 300ppm dosage as the reference, and the results are shown in FIG. 4.
Comparative example 3
The salt inhibitor provided in this comparative example 3 was formulated as follows:
s1, configuring a component 1: ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 2-3:0.5-1:5-10.
S2, adding DBPNA accounting for 1 per mill of the total weight and polyethylene glycol silicate accounting for 3 per mill of the total weight (400).
The same source of 25% sulfate and silica containing wastewater was treated in the same manner as in example 1. The experiment was conducted based on the salt content of 1% per 1% and the dosage of 300ppm, and the results are shown in FIG. 5.
Comparative example 4
The salt inhibitor provided in this comparative example 4 was formulated as follows:
s1, configuring a component 1: ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 2-3:0.5-1:5-10.
S2, adding DBPNA accounting for 1 per mill of the total weight and polyethylene glycol silicate accounting for 3 per mill of the total weight (400).
The same source of 25% sulfate and silica containing wastewater was treated in the same manner as in example 1. The experiment was conducted based on the salt content of 1% per 1% and the dosage of 300ppm, and the results are shown in FIG. 6.
Comparative example 5
The salt inhibitor provided in this comparative example 5 was formulated as follows:
s1, configuring a component 1: nonionic surfactant PEG200.
S2, configuring a component 2: the preparation method comprises the steps of (1) mixing polyamino polyether methylene phosphonic acid sodium salt, diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt according to a proportion of 10-12:5-6:1-2.
S3, mixing the component 1 with the component 2 according to the mass ratio of 2-3:1, adding DBPNA accounting for 1 per mill of the total weight and polyethylene glycol silicate accounting for 3 per mill of the total weight (400).
The same source of 25% sulfate and silica containing wastewater was treated in the same manner as in example 1. The experiment was conducted based on the salt content of 1% per 1% and the dosage of 300ppm, and the results are shown in FIG. 7.
From the above comparative examples, it can be found that the similar effects to those of the present invention cannot be achieved by adopting the existing products or adopting the formulation similar to the present invention, the wastewater treated by the comparative products still has the final crystals in the form of agglomerates or partial agglomerates and is adsorbed on the surface of the container, and the crystals cannot be achieved in the form of powdery, uniform and loose particles, thus leading to the difficulty of the desalting process.
EXAMPLE 2,
The salt inhibitor provided in this example 2 was formulated as follows:
s1, configuring a component 1: ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 2:1:5, compounding.
S2, configuring a component 2: the preparation method comprises the following steps of (1) mixing a polyamino polyether methylene phosphonic acid sodium salt, a diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt according to a proportion of 10: and 6, compounding according to the ratio of 1.
S3, mixing the component 1 with the component 2 according to the mass ratio of 3:1, adding DBPNA accounting for 1 per mill of the total weight and polyethylene glycol silicate accounting for 3 per mill of the total weight (400).
EXAMPLE 3,
The salt inhibitor provided in this example 3 was formulated as follows:
s1, configuring a component 1: ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 3:0.5:8, compounding.
S2, configuring a component 2: the preparation method comprises the following steps of (1) mixing a polyamino polyether methylene phosphonic acid sodium salt, a diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt according to a proportion of 11: and 6, compounding according to the ratio of 1.
S3, mixing the component 1 with the component 2 according to the mass ratio of 2.5:1, adding DBPNA accounting for 2 per mill of the total weight and polyethylene glycol silicate accounting for 3 per mill of the total weight (800).
EXAMPLE 4,
The salt inhibitor provided in this example 4 was formulated as follows:
s1, configuring a component 1: ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 1:0.5:1, compounding.
S2, configuring a component 2: the preparation method comprises the following steps of (1) mixing a polyamino polyether methylene phosphonic acid sodium salt, a diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt according to a proportion of 2: and 3, compounding according to the ratio of 1.
S3, mixing the component 1 with the component 2 according to the mass ratio of 1:1, adding DBPNA accounting for 1 per mill of the total weight and polyethylene glycol silicate accounting for 4 per mill of the total weight (800).
EXAMPLE 5,
The salt inhibitor provided in this example 5 was formulated as follows:
s1, configuring a component 1: ethoxylated alkyl sodium sulfate, sodium dodecyl benzene sulfonate and sodium paratoluenesulfonate are mixed according to the mass ratio of 5:0.5: and 3, compounding.
S2, configuring a component 2: the preparation method comprises the following steps of (1) mixing a polyamino polyether methylene phosphonic acid sodium salt, a diethylenetriamine pentamethylene phosphoric acid sodium salt and ethylenediamine tetraacetic acid sodium salt in a proportion of 1: and 3, compounding according to the ratio of 3:6.
S3, mixing the component 1 with the component 2 according to the mass ratio of 2:1, adding DBPNA accounting for 0.5 per mill of the total weight and polyethylene glycol silicate accounting for 1 per mill of the total weight (200).
Based on the same test conditions and methods as in example 1, the products of examples 2 to 5 were subjected to an effect test experiment in the same manner as in example 1. The same effect is achieved, i.e. a loose crystal is formed as shown in fig. 3-1 to 3-3, with an ideal effect.
Claims (7)
1. The salt inhibitor for the salt-containing wastewater back-spraying quench tower process is characterized by being prepared by mixing the following components:
wherein component 1 is a mixture comprising ethoxylated alkyl sulfate, long chain alkylbenzene sulfonate, p-toluene sulfonate;
component 2 is a mixture containing polyamino polyether methylene phosphonic acid sodium salt, diethylenetriamine pentamethylene sodium phosphate and ethylenediamine tetraacetic acid sodium salt;
component 3 comprises 2, 2-dibromo-3-nitrilopropionamide and polyethylene glycol silicate;
wherein, the component 1: the mass ratio of the component 2 is 1-10:1, a step of;
the dosage of the component 3 is 1-10 per mill of the total weight of the salt inhibitor;
the long-chain alkylbenzene sulfonate is one or more of long-chain alkylbenzene sulfonates with the carbon number of 8-20;
the polyethylene glycol silicate is one or more selected from polyethylene glycol silicate with molecular weight of 400-4000;
the application method is as follows:
when the sulfate and silicon dioxide in the wastewater account for less than 10 percent (excluding) of the total salt content,
the salt content is 1% and the dosage is 50-80ppm;
when the sulfate and silicon dioxide in the wastewater account for 10 percent (contained) to 30 percent (not contained) of the total salt content,
the salt content is 1 percent, and the dosage is 80-150ppm;
when the sulfate and silicon dioxide in the wastewater account for more than 30 percent (inclusive) of the total salt content,
the salt content is 1% and the dosage is 150-300ppm.
2. A salt inhibitor for a brine waste back-spraying quench tower process as defined in claim 1, wherein:
the mass ratio of the ethoxylated alkyl sulfate to the long-chain alkylbenzene sulfonate to the p-toluene sulfonate is 1-5:0.5-1:1-20.
3. A salt inhibitor for a brine waste back-spraying quench tower process as defined in claim 1, wherein:
the mass ratio of the ethoxylated alkyl sulfate to the long-chain alkylbenzene sulfonate to the p-toluene sulfonate is 2-3:0.5-1:5-10.
4. A salt inhibitor for a brine waste back-spraying quench tower process as defined in claim 1, wherein:
the mass ratio of the polyamino polyether methylene phosphonic acid sodium salt to the diethylenetriamine pentamethylene sodium phosphate to the ethylenediamine tetraacetic acid sodium salt is 5-15:4-10:1-2.
5. A salt inhibitor for a brine waste back-spraying quench tower process as defined in claim 1, wherein:
the mass ratio of the polyamino polyether methylene phosphonic acid sodium salt to the diethylenetriamine pentamethylene sodium phosphate to the ethylenediamine tetraacetic acid sodium salt is 10-12:5-6:1-2.
6. A salt inhibitor for a brine waste back-spraying quench tower process as defined in claim 1, wherein:
the mass ratio of the component 1 to the component 2 is 2-3:1.
7. a salt inhibitor for a brine waste back-spraying quench tower process as defined in claim 1, wherein:
the dosage of the 2, 2-dibromo-3-nitrilopropionamide is 1/4-1/2 of that of polyethylene glycol silicate.
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