CN113336341A

CN113336341A - Dispersing agent for recycling saline wastewater of incineration system quench tower

Info

Publication number: CN113336341A
Application number: CN202110619137.5A
Authority: CN
Inventors: 和庆; 邢建南; 孙波
Original assignee: Shanghai Meilin Environmental Protection Technology Co ltd
Current assignee: Shanghai Meilin Environmental Protection Technology Co ltd
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2021-09-03

Abstract

The invention provides a dispersant composition, which comprises the following components: (A) a chain carboxylic acid compound containing an odd number of nitrogen atoms and/or a salt thereof, (B) a chain carboxylic acid compound containing an even number of nitrogen atoms and/or a salt thereof, and (C) a chain carboxylic acid compound containing no nitrogen atom and containing a hydroxyl group and/or a salt thereof. The dispersing agent provided by the invention obviously reduces salt deposition and scaling of the back-spraying brine in the quench tower, reduces equipment investment, reduces cost, reduces manual intervention frequency caused by direct recycling, has a wide application range, and is not only suitable for waste water generated by incineration, but also suitable for acid-base neutralization of the waste water.

Description

Dispersing agent for recycling saline wastewater of incineration system quench tower

Technical Field

The invention belongs to the field of recycling of saline wastewater of a quench tower of a solid waste incineration system, and particularly relates to a dispersing agent for recycling the saline wastewater of the quench tower of the incineration system.

Background

At present, the environment protection situation is more severe, and relevant environmental protection policies are issued in all places, and for solid waste incineration disposal, the requirement of realizing zero discharge of waste water is specifically provided. The solid waste disposal materials are relatively complex and have variable components, a series of smoke is generated in the incineration process, the components of the smoke contain halogen elements such as sulfur and chlorine, and the incineration smoke treatment system can finally generate saline wastewater with the salt concentration of more than 5 wt%. In addition, the components of the waste acid alkali materials are relatively mixed, the resource utilization is difficult, the harmless neutralization treatment is a common means at present, and the salt concentration of the waste water is higher and is generally more than 20 wt%. Both the two types of waste water need to be treated in an environment-friendly way, and the prior art method usually adopts a triple-effect evaporation treatment method and needs to consume a large amount of energy.

The relatively clean water sources such as tap water are generally adopted for the quenching tower of the solid waste incineration system to carry out back spraying, and salt-containing wastewater replaces the recycling process, and due to the fact that the salt concentration is relatively high, scaling can be formed on the tower wall and the spray gun, the stability of the incineration system is affected, further parking accidents can be caused, production is affected, and manual clearing measures must be taken for the equipment to be reused.

Chinese patent CN108408812B discloses a desalination method and a device for salt-containing wastewater, which can reduce the scaling damage of equipment by reusing the desalination treatment of the high salt-containing wastewater, but the method has complex process and higher cost. At present, salt-containing wastewater is desalted by adopting treatment means such as an electrolytic method treatment process, a membrane separation treatment process, an ion exchange method treatment process, a biological method treatment process, an evaporative crystallization process and the like, the process limitations are large, the input cost is huge, some produced waste salts still belong to dangerous wastes, the landfill cost is high, and precious landfill resources are occupied.

Therefore, salt deposition and scaling exist in the process of recycling the salt-containing wastewater such as the acid-removing wastewater, the waste acid-alkali neutralization wastewater and the like in the existing incineration in the quench tower, which affects the incineration system, causes parking accidents and affects the production. There is a need in the art for an agent that is effective in inhibiting salt back-spray salt deposition and scale deposition in the quench tower of an incineration system.

Disclosure of Invention

In order to solve the problems existing in the recycling process of the saline wastewater in the quenching tower at present, respond to an environmental call and realize zero discharge of wastewater, the invention provides a dispersing agent for recycling the saline wastewater in the quenching tower of an incineration system. The dispersing agent provided by the invention obviously reduces salt deposition and scaling of the back-spraying brine in the quench tower, reduces equipment investment, reduces cost, reduces manual intervention frequency caused by direct recycling, has a wide application range, and is not only suitable for waste water generated by incineration, but also suitable for acid-base neutralization of the waste water.

Specifically, the invention provides a dispersant composition, which comprises the following components:

(A) a chain carboxylic acid compound containing an odd number of nitrogen atoms and/or a salt thereof,

(B) chain carboxylic acid compound containing an even number of nitrogen atoms and/or salt thereof, and

(C) a chain carboxylic acid compound containing no nitrogen atom and a hydroxyl group and/or a salt thereof;

wherein the mass ratio of the component A to the component B is 1:5 to 5:1, and the mass ratio of the component A to the component C is 1:9 to 15: 1.

In one or more embodiments, the carboxylic acid compound as component A contains 2 to 20 carbon atoms, 1 to 5 carboxyl groups, and 1 to 5 nitrogen atoms.

In one or more embodiments, the component a is selected from one or more of nitrilotriacetic acid and salts thereof, dicarboxymethylalanine and salts thereof, N ' -di (2-hydroxyethyl) glycine and salts thereof, diethylenetriaminepentaacetic acid and salts thereof, and iminodiacetic acid and salts thereof, preferably from one or more of nitrilotriacetic acid, dicarboxymethylalanine, N ' -di (2-hydroxyethyl) glycine, diethylenetriaminepentaacetic acid, iminodiacetic acid, trisodium/potassium nitrilotriacetate, dicarboxymethylalanine trisodium/potassium, N ' -di (2-hydroxyethyl) sodium/potassium glycinate, diethylenetriaminepentasodium/potassium acetate, and iminodisodium/potassium.

In one or more embodiments, the carboxylic acid compound as component B contains 2 to 20 carbon atoms, 2 to 6 carboxyl groups, and 2 to 6 nitrogen atoms.

In one or more embodiments, the component B is selected from one or more of hydroxyethylethylenediaminetriacetic acid and salts thereof, N '-ethylenediaminedisuccinic acid and salts thereof, ethylenediaminetetraacetic acid and salts thereof, ethylenediamine-N, N' -diacetic acid and salts thereof, and ethylene glycol bis (2-aminoethyl ether) tetraacetic acid and salts thereof, preferably from hydroxyethylethylenediaminetriacetic acid, N '-ethylenediaminedisuccinic acid, ethylenediaminetetraacetic acid, ethylenediamine-N, N' -diacetic acid, ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, hydroxyethylethylenediaminetriacetic acid trisodium/potassium, N '-ethylenediaminedisuccinic acid trisodium/potassium, ethylenediaminetetraacetic acid disodium/potassium, ethylenediaminetetraacetic acid tetrasodium/potassium, ethylenediamine-N, N' -diacetic acid sodium/potassium, and ethylene glycol bis (2-aminoethyl ether) tetraacetic acid tetrasodium One or more of potassium.

In one or more embodiments, the carboxylic acid compound as component C contains 2 to 20 carbon atoms, 1 to 3 carboxyl groups, and 1 to 3 hydroxyl groups.

In one or more embodiments, component C is selected from one or more of citric acid and salts thereof, 2, 3-dihydroxysuccinic acid and salts thereof, and 2-hydroxyphosphonoacetic acid and salts thereof, preferably from one or more of citric acid, 2, 3-dihydroxysuccinic acid, 2-hydroxyphosphonoacetic acid, trisodium citrate/potassium, sodium/potassium 2, 3-dihydroxysuccinate, and sodium/potassium 2-hydroxyphosphonoacetate.

In one or more embodiments, the lyophobic composition further includes the following components:

(D) a six-membered ring-containing carboxylic acid compound and/or a salt thereof;

preferably, the mass ratio of component a to component D is from 2:1 to 10: 1.

In one or more embodiments, the carboxylic acid compound as component D contains 7 to 20 carbon atoms and 1 to 4 carboxyl groups.

In one or more embodiments, the component D is selected from one or more of 1, 2-cyclohexanediamine tetraacetic acid and salts thereof and benzoic acid and salts thereof, preferably from one or more of 1, 2-cyclohexanediamine tetraacetic acid, benzoic acid, disodium/potassium 1, 2-cyclohexanediamine tetraacetic acid and sodium/potassium benzoate.

The present invention also provides a dispersant which is an aqueous solution of the dispersant composition according to any of the embodiments herein.

In one or more embodiments, the concentration of the phobizing agent is from 10 to 40 wt%.

The invention also provides a method for recycling saline wastewater in a quenching tower of a solid waste incineration system, which comprises the step of adding the dispersant composition or the dispersant according to any one of the embodiments into the saline wastewater before the saline wastewater is sprayed into the quenching tower, and uniformly mixing the dispersant composition or the dispersant with the saline wastewater and then spraying the mixture into the quenching tower.

In one or more embodiments, the saline wastewater is incineration wastewater or acid-base neutralization wastewater; preferably, the incineration waste water or acid-base neutralization waste water is as described in any embodiment herein.

Drawings

FIG. 1 shows the ash discharge from a quenching tower in the case of using incineration waste water without a dispersing agent added thereto for back-spraying.

FIG. 2 shows the ash discharge from a quenching tower in the back-spraying of incineration waste water to which the dispersant of example 1 was added.

FIG. 3 shows the clogging of a quenching tower in the back-spraying of incineration waste water to which the dispersing agent of comparative example 1 was added.

Detailed Description

To make the features and effects of the present invention comprehensible to those skilled in the art, general description and definitions are made below with reference to terms and expressions mentioned in the specification and claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The theory or mechanism described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, i.e., the present disclosure may be practiced without limitation to any particular theory or mechanism.

The terms "comprising," "including," "containing," "having," and the like, herein, encompass the meanings of "consisting essentially of … …" and "consisting of … …," e.g., when "a comprises B and C," is disclosed herein, it is to be understood that "a consists of B and C" has been disclosed herein. As used herein, "about" and "approximately" and similar phrases mean within + -10% of the given value.

All features defined herein as numerical ranges or percentage ranges, such as numbers, amounts, levels and concentrations, are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to cover and specifically disclose all possible subranges and individual numerical values (including integers and fractions) within the range.

Herein, when embodiments or examples are described, it is to be understood that they are not intended to limit the invention to these embodiments or examples. On the contrary, all alternatives, modifications, and equivalents of the methods and materials described herein are intended to be included within the scope of the invention as defined by the appended claims. In this context, for the sake of brevity, not all possible combinations of features in the various embodiments or examples are described. Therefore, the respective features in the respective embodiments or examples may be arbitrarily combined as long as there is no contradiction between the combinations of the features, and all the possible combinations should be considered as the scope of the present specification.

Herein, the incineration disposal system for solid waste (simply referred to as incineration system) has a meaning known in the art, and may be various known incineration disposal devices for solid waste. The incineration system comprises a wastewater pool and a quenching tower. The quenching tower is a device for rapidly cooling high-temperature waste gas generated by solid waste incineration through water spraying. The wastewater pool is a device for storing salt-containing wastewater as a water source of the quenching tower.

The invention finds that the use of one or two carboxylic acid compounds and/or salts thereof is difficult to effectively inhibit salt deposition and scale deposition when the salt water is sprayed back to a cooling tower of an incineration system. According to the invention, through further research, the complex use of a plurality of specific types of carboxylic acid compounds and/or salts thereof as the dispersion agent can obviously reduce the scale formation of the back-sprayed salt water, thereby reducing the equipment investment, lowering the cost and reducing the manual intervention frequency caused by direct recycling.

The dispersing agent comprises the following components:

(C) a chain carboxylic acid compound containing no nitrogen atom and a hydroxyl group and/or a salt thereof.

In the present invention, the carboxylic acid compound means an organic compound having a carboxyl group (-COOH). The chain carboxylic acid compound refers to a carboxylic acid compound having no ring in the molecular structure. The chain carboxylic acid compound includes a linear carboxylic acid compound and a branched carboxylic acid compound. The carboxylic acid compounds suitable for use in the present invention generally contain 2 to 20 carbon atoms, preferably 2 to 16 carbon atoms, for example 2 to 14 carbon atoms.

The component a contained in the dispersant of the present invention is a chain carboxylic acid compound containing an odd number of nitrogen atoms and/or a salt thereof. The carboxylic acid compounds as component A generally contain 2 to 20 carbon atoms, preferably 2 to 16 carbon atoms, for example 2 to 14 carbon atoms, 4 to 14 carbon atoms. In some embodiments, the carboxylic acid compound as component A contains 1 to 5 carboxyl groups. In some embodiments, the carboxylic acid compound as component a contains 1, 3 or 5 nitrogen atoms, for example 1 or 3 nitrogen atoms. Examples of component a include, but are not limited to, nitrilotriacetic acid and salts thereof, dicarboxymethylalanine and salts thereof, N' -di (2-hydroxyethyl) glycine and salts thereof, diethylenetriaminepentaacetic acid and salts thereof, and iminodiacetic acid and salts thereof. In the present invention, the salt of the carboxylic acid compound means a water-soluble salt of the carboxylic acid compound, such as sodium salt and potassium salt. Examples of nitrilotriacetic acid salts suitable for use in the present invention include, but are not limited to, trisodium/potassium nitrilotriacetate. In the present invention, "sodium/potassium carboxylate compound" means one or more of sodium salt of carboxylic acid compound and potassium salt of carboxylic acid compound, for example, "trisodium nitrilotriacetate/potassium" means one or both of trisodium nitrilotriacetate and tripotassium nitrilotriacetate. It is to be understood that while in some embodiments the invention employs sodium salts of carboxylic acid compounds, potassium salts of the corresponding carboxylic acid compounds are equally suitable for use in the invention. Examples of dicarboxymethylalaninates suitable for use in the present invention include, but are not limited to, trisodium/potassium dicarboxymethylalaninate. Examples of N, N '-bis (2-hydroxyethyl) glycinates suitable for use in the present invention include, but are not limited to, sodium/potassium N, N' -bis (2-hydroxyethyl) glycinate. Examples of diethylenetriamine pentaacetate salts suitable for use in the present invention include, but are not limited to, pentasodium/potassium diethylenetriamine pentaacetate. Examples of iminodiacetic acid salts suitable for use in the present invention include, but are not limited to, sodium/potassium iminodiacetate. In some embodiments, component a is selected from one or more of nitrilotriacetic acid, dicarboxymethylalanine, N '-di (2-hydroxyethyl) glycine, diethylenetriaminepentaacetic acid, iminodiacetic acid, trisodium/potassium nitrilotriacetate, trisodium/potassium dicarboxymethylalanine, sodium/potassium N, N' -di (2-hydroxyethyl) glycinate, pentasodium/potassium diethylenetriaminepentaacetate, and sodium/potassium iminodiacetate. In some embodiments, component a is selected from one or more of trisodium/potassium nitrilotriacetate, trisodium/potassium dicarboxymethylalanine, sodium/potassium N, N' -bis (2-hydroxyethyl) glycinate, pentasodium/potassium diethylenetriaminepentaacetate and sodium/potassium iminodiacetate.

The component B contained in the dispersant of the present invention is a chain carboxylic acid compound containing an even number of nitrogen atoms and/or a salt thereof. The carboxylic acid compound as component B usually contains 2 to 20 carbon atoms, preferably 2 to 16 carbon atoms, for example 2 to 14 carbon atoms, 4 to 14 carbon atoms, 6 to 14 carbon atoms. In some embodiments, the carboxylic acid compound as component B contains 2 or more carboxyl groups, for example 2 to 6 carboxyl groups, 2 to 4 carboxyl groups. In some embodiments, the carboxylic acid compound as component B contains 2, 4 or 6 nitrogen atoms, for example 2 nitrogen atoms. Examples of component B include, but are not limited to, hydroxyethylethylenediaminetriacetic acid and its salts, N '-ethylenediaminedisuccinic acid and its salts, ethylenediaminetetraacetic acid and its salts, ethylenediamine-N, N' -diacetic acid and its salts, and ethylene glycol bis (2-aminoethyl ether) tetraacetic acid and its salts. Examples of hydroxyethylethylenediamine triacetic acid salts suitable for use in the present invention include, but are not limited to, trisodium/potassium hydroxyethylethylenediamine triacetic acid. Examples of N, N '-ethylenediamine disuccinates suitable for use in the present invention include, but are not limited to, trisodium/potassium N, N' -ethylenediamine disuccinate. Examples of edetate salts suitable for use in the present invention include, but are not limited to, disodium/potassium edetate and tetrasodium/potassium edetate. Examples of ethylenediamine-N, N '-diacetic acid salts suitable for use in the present invention include, but are not limited to, sodium/potassium ethylenediamine-N, N' -diacetic acid. Examples of ethylene glycol bis (2-aminoethyl ether) tetraacetate salts suitable for use in the present invention include, but are not limited to, tetrasodium/potassium ethylene glycol bis (2-aminoethyl ether) tetraacetate. In some embodiments, component B is selected from one or more of hydroxyethylethylenediaminetriacetic acid, N '-ethylenediaminedisuccinic acid, ethylenediaminetetraacetic acid, ethylenediamine-N, N' -diacetic acid, ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, trisodium/potassium hydroxyethylethylenediaminetriacetic acid, trisodium/potassium N, N '-ethylenediaminedisuccinate, disodium/potassium ethylenediaminetetraacetate, tetrasodium/potassium ethylenediaminetetraacetate, sodium/potassium ethylenediamine-N, N' -diacetic acid, and tetrasodium/potassium ethylene glycol bis (2-aminoethyl ether) tetraacetic acid. In some embodiments, component B is selected from one or more of trisodium/potassium hydroxyethylethylenediamine triacetate, trisodium/potassium N, N '-ethylenediamine disuccinate, disodium/potassium ethylenediamine tetraacetate, tetrasodium/potassium ethylenediamine tetraacetate, sodium/potassium ethylenediamine-N, N' -diacetate, and tetrasodium/potassium ethylene glycol bis (2-aminoethyl ether) tetraacetate.

In the dispersion agent of the present invention, the mass ratio of the component a to the component B is 1:5 to 5:1, for example, about 1:5, about 1:4, about 3:7, about 5:8, about 2:3, about 4:5, about 6:5, about 5:4, about 15:8, about 2:1, about 3:1, about 4:1, and about 5: 1.

The component C contained in the dispersant of the present invention is a chain carboxylic acid compound containing no nitrogen atom and containing a hydroxyl group and/or a salt thereof. The carboxylic acid compound as component C generally contains 2 to 20 carbon atoms, preferably 2 to 16 carbon atoms, for example 2 to 10 carbon atoms, 2 to 6 carbon atoms. In some embodiments, the carboxylic acid compound as component C contains 1-3 carboxyl groups. In some embodiments, the carboxylic acid compound as component C contains 1 to 3 hydroxyl groups, excluding the hydroxyl group on the carboxyl group. Examples of component C include, but are not limited to, citric acid and its salts, 2, 3-dihydroxysuccinic acid and its salts, and 2-hydroxyphosphonoacetic acid and its salts. Examples of citrates suitable for use in the present invention include, but are not limited to, trisodium/potassium citrate. Examples of 2, 3-dihydroxysuccinate salts suitable for use in the present invention include, but are not limited to, sodium/potassium 2, 3-dihydroxysuccinate. Examples of 2-hydroxyphosphonoacetate suitable for use in the present invention include, but are not limited to, sodium/potassium 2-hydroxyphosphonoate. In some embodiments, component C is selected from one or more of citric acid, 2, 3-dihydroxysuccinic acid, 2-hydroxyphosphonoacetic acid, trisodium/potassium citrate, sodium/potassium 2, 3-dihydroxysuccinate, and sodium/potassium 2-hydroxyphosphonoacetate. In some embodiments, component C is selected from one or more of trisodium/potassium citrate, sodium/potassium 2, 3-dihydroxysuccinate, and sodium/potassium 2-hydroxyphosphonoate.

In the dispersion agent of the present invention, the mass ratio of the component a to the component C is 1:9 to 15:1, for example, about 1:9, about 1:3, about 1:2, about 2:5, about 3:4, about 5:4, about 2:1, about 5:2, about 3:1, about 4:1, about 10:1, about 12:1, and about 15: 1.

In some embodiments, the dispersant of the present invention comprises component a selected from nitrilotriacetic acid and salts thereof (e.g., trisodium/potassium nitrilotriacetic acid), dicarboxymethylalanine and salts thereof (e.g., trisodium/potassium dicarboxymethylalanine), N '-di (2-hydroxyethyl) glycine and salts thereof (e.g., sodium/potassium N, N' -di (2-hydroxyethyl) glycine), diethylenetriaminepentaacetic acid and salts thereof (e.g., pentasodium/potassium diethylenetriaminepentaacetic acid) and iminodiacetic acid and salts thereof (e.g., sodium/potassium iminodiacetate), or one or more selected from nitrilotriacetic acid and salts thereof, and component B selected from hydroxyethylethylenediaminetriacetic acid and salts thereof (e.g., trisodium/potassium hydroxyethylethylenediaminetriacetic acid), ethyleneglycol bis (2-aminoethyl ether) tetraacetic acid and salts thereof (e.g., ethyleneglycol bis (2-aminoethyl ether) tetraacetic acid tetrasodium tetraacetate) Potassium), ethylenediaminetetraacetic acid and salts thereof (e.g. disodium/potassium ethylenediaminetetraacetate, tetrasodium/potassium ethylenediaminetetraacetate), one or more of N, N '-ethylenediaminedisuccinic acid and salts thereof (e.g. trisodium/potassium N, N' -ethylenediaminedisuccinate) and ethylenediamine-N, N '-diacetic acid and salts thereof (e.g. sodium/potassium ethylenediamine-N, N' -diacetic acid), component C being selected from one or more of citric acid and salts thereof (e.g. trisodium/potassium citrate), 2, 3-dihydroxysuccinic acid and salts thereof (e.g. sodium/potassium 2, 3-dihydroxysuccinate) and 2-hydroxyphosphonoacetic acid and salts thereof (e.g. sodium/potassium 2-hydroxyphosphonoacetate).

In some embodiments, the dispersant of the present invention comprises component a selected from one or more of nitrilotriacetic acid and salts thereof (e.g., trisodium/potassium nitrilotriacetic acid), component B selected from one or more of hydroxyethylethylenediaminetriacetic acid and salts thereof (e.g., trisodium/potassium hydroxyethylethylenediaminetriacetic acid), and component C selected from one or more of citric acid and salts thereof (e.g., trisodium/potassium citrate), 2, 3-dihydroxysuccinic acid and salts thereof (e.g., sodium/potassium 2, 3-dihydroxysuccinate), and 2-hydroxyphosphonoacetic acid and salts thereof (e.g., sodium/potassium 2-hydroxyphosphonoacetate).

In some embodiments, the dispersant of the present invention comprises one or more of component A selected from the group consisting of nitrilotriacetic acid and salts thereof (e.g., trisodium/potassium nitrilotriacetic acid), component B selected from the group consisting of hydroxyethylethylenediaminetriacetic acid and salts thereof (e.g., trisodium/potassium hydroxyethylethylenediaminetriacetic acid), ethylene glycol bis (2-aminoethyl ether) tetraacetic acid and salts thereof (e.g., tetrasodium/potassium ethylene glycol bis (2-aminoethyl ether) tetraacetic acid), ethylenediaminetetraacetic acid and salts thereof (e.g., disodium/potassium ethylenediaminetetraacetate, tetrasodium/potassium ethylenediaminetetraacetate), N '-ethylenediaminedisuccinic acid and salts thereof (e.g., trisodium/potassium N, N' -ethylenediaminedisuccinic acid), and ethylenediaminediacetic acid and salts thereof (e.g., sodium/potassium ethylenediaminediacetate), component C is selected from one or more of 2, 3-dihydroxysuccinic acid and salts thereof (e.g., sodium/potassium 2, 3-dihydroxysuccinate).

In some embodiments, the dispersant of the present invention comprises component A selected from the group consisting of nitrilotriacetic acid and salts thereof (e.g., trisodium/potassium nitrilotriacetic acid), dicarboxymethylalanine and salts thereof (e.g., trisodium/potassium dicarboxymethylalanine), one or more of N, N '-di (2-hydroxyethyl) glycine and salts thereof (e.g. sodium/potassium N, N' -di (2-hydroxyethyl) glycinate), diethylenetriaminepentaacetic acid and salts thereof (e.g. pentasodium/potassium diethylenetriaminepentaacetic acid) and iminodiacetic acid and salts thereof (e.g. sodium/potassium iminodiacetate), component B being selected from one or more of hydroxyethylethylenediaminetriacetic acid and salts thereof, component C being selected from one or more of 2, 3-dihydroxysuccinic acid and salts thereof (e.g. sodium/potassium 2, 3-dihydroxysuccinic acid).

In some embodiments, the dispersant of the present invention further comprises component D: a carboxylic acid compound having a six-membered ring and/or a salt thereof.

The dispersant of the present invention contains a component D which is a carboxylic acid compound containing a six-membered ring and/or a salt thereof. In some embodiments, the six-membered ring comprised by component D is selected from cyclohexane and a benzene ring. The carboxylic acid compounds as component D generally contain from 7 to 20 carbon atoms, preferably from 7 to 16 carbon atoms, for example from 7 to 14 carbon atoms. In some embodiments, the carboxylic acid compound as component D contains 1 to 4 carboxyl groups. In some embodiments, the carboxylic acid compound as component D contains 1 six-membered ring, such as cyclohexane or benzene ring. Examples of component D include, but are not limited to, 1, 2-cyclohexanediaminetetraacetic acid and salts thereof and benzoic acid and salts thereof. Examples of 1, 2-cyclohexanediamine tetraacetate salts suitable for use in the present invention include, but are not limited to, disodium/potassium 1, 2-cyclohexanediamine tetraacetate. Examples of benzoates suitable for use in the present invention include, but are not limited to, sodium/potassium benzoate. In some embodiments, component D is selected from one or more selected from the group consisting of 1, 2-cyclohexanediaminetetraacetic acid, benzoic acid, disodium/potassium 1, 2-cyclohexanediaminetetraacetic acid, and sodium/potassium benzoate. In some embodiments, component D is selected from one or more of disodium/potassium 1, 2-cyclohexanediaminetetraacetate and sodium/potassium benzoate.

When the dispersing agent includes the component D, the mass ratio of the component a to the component D in the dispersing agent of the present invention is between 2:1 and 10:1, preferably between 5:2 and 6:1, for example, about 5:2, about 5:1, or about 6: 1.

In some embodiments, the dispersing agent of the present invention comprises nitrilotriacetic acid and/or salts thereof, hydroxyethylethylenediaminetriacetic acid and/or salts thereof, and 2, 3-dihydroxysuccinic acid and/or salts thereof. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium aminotriacetate, trisodium/potassium hydroxyethylethylenediaminetriacetic acid, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the dispersant of the present invention comprises nitrilotriacetic acid and/or salts thereof, ethylene glycol bis (2-aminoethyl ether) tetraacetic acid and/or salts thereof, and 2, 3-dihydroxysuccinic acid and/or salts thereof. In some embodiments, the dispersants of the present invention comprise trisodium/potassium aminotriacetate, tetrasodium/potassium ethylene glycol bis (2-aminoethyl ether) tetraacetate, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the dispersant of the present invention comprises nitrilotriacetic acid and/or salts thereof, N' -ethylenediamine disuccinic acid and/or salts thereof, and 2, 3-dihydroxysuccinic acid and/or salts thereof. In some embodiments, the dispersants of the present invention comprise trisodium/potassium aminotriacetate, trisodium/potassium N, N' -ethylenediamine disuccinate, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the thinning agent of the present invention comprises nitrilotriacetic acid and/or salts thereof, ethylenediamine-N, N' -diacetic acid and/or salts thereof, and 2, 3-dihydroxysuccinic acid and/or salts thereof. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium aminotriacetate, sodium/potassium ethylenediamine-N, N' -diacetate, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the thinning agent of the present invention comprises nitrilotriacetic acid and/or salts thereof, ethylenediaminetetraacetic acid and/or salts thereof, and 2, 3-dihydroxysuccinic acid and/or salts thereof. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium aminotriacetate, disodium/potassium ethylenediaminetetraacetate, and sodium/potassium 2, 3-dihydroxysuccinate. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium aminotriacetate, tetrasodium/potassium ethylenediaminetetraacetate, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the dispersant of the present invention comprises dicarboxymethylalanine and/or a salt thereof, hydroxyethylethylenediaminetriacetic acid and/or a salt thereof, and 2, 3-dihydroxysuccinic acid and/or a salt thereof. In some embodiments, the dispersants of the present invention comprise trisodium/potassium dicarboxymethylalanine, trisodium/potassium hydroxyethylethylenediamine triacetic acid, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the thinning agent of the present invention comprises N, N' -di (2-hydroxyethyl) glycine and/or a salt thereof, hydroxyethylethylenediaminetriacetic acid and/or a salt thereof, and 2, 3-dihydroxysuccinic acid and/or a salt thereof. In some embodiments, the dispersants of the present invention comprise sodium/potassium N, N' -bis (2-hydroxyethyl) glycinate, trisodium/potassium hydroxyethylethylenediaminetriacetic acid and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the lyophobic agent of the present invention comprises diethylenetriaminepentaacetic acid and/or salt thereof, hydroxyethylethylenediaminetriacetic acid and/or salt thereof, and 2, 3-dihydroxysuccinic acid and/or salt thereof. In some embodiments, the lyophobic of the present invention comprises pentasodium/potassium diethylenetriaminepentaacetate, trisodium/potassium hydroxyethylethylenediamine triacetate, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the thinning agent of the present invention comprises iminodiacetic acid and/or a salt thereof, hydroxyethylethylenediaminetriacetic acid and/or a salt thereof, and 2, 3-dihydroxysuccinic acid and/or a salt thereof. In some embodiments, the dispersants of the present invention comprise sodium/potassium iminodiacetate, trisodium/potassium hydroxyethylethylenediamine triacetate, and sodium/potassium 2, 3-dihydroxysuccinate.

In some embodiments, the thinning agent of the present invention comprises nitrilotriacetic acid and/or salts thereof, hydroxyethylethylenediaminetriacetic acid and/or salts thereof, and citric acid and/or salts thereof. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium aminotriacetate, trisodium/potassium hydroxyethylethylenediaminetriacetic acid, and trisodium/potassium citrate.

In some embodiments, the thinning agent of the present invention comprises nitrilotriacetic acid and/or salts thereof, hydroxyethylethylenediaminetriacetic acid and/or salts thereof, and 2-hydroxyphosphonoacetic acid and/or salts thereof. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium nitrilotriacetate, trisodium/potassium hydroxyethylethylenediaminetriacetic acid, and sodium/potassium 2-hydroxyphosphonoacetate.

In some embodiments, the dispersant of the present invention comprises nitrilotriacetic acid and/or salts thereof, N' -ethylenediamine disuccinic acid and/or salts thereof, 2-hydroxyphosphonoacetic acid and/or salts thereof, and benzoic acid and/or salts thereof. In some embodiments, the thinning agent of the present invention comprises trisodium/potassium nitrilotriacetate, trisodium/potassium N, N' -ethylenediamine disuccinate, sodium/potassium 2-hydroxyphosphonoate, and sodium/potassium benzoate.

In some embodiments, the dispersant of the present invention comprises nitrilotriacetic acid and/or salts thereof, ethylenediamine-N, N' -diacetic acid and/or salts thereof, citric acid and/or salts thereof, and 1, 2-cyclohexanediaminetetraacetic acid and/or salts thereof. In some embodiments, the dispersants of the present invention comprise trisodium/potassium nitrilotriacetate, sodium/potassium ethylenediamine-N, N' -diacetate, trisodium/potassium citrate, and disodium/potassium 1, 2-cyclohexanediaminetetraacetate.

In some embodiments, the dispersants of the present invention comprise dicarboxymethylalanine and/or salts thereof, N' -ethylenediamine disuccinic acid and/or salts thereof, 2-hydroxyphosphonoacetic acid and/or salts thereof, and benzoic acid and/or salts thereof. In some embodiments, the dispersants of the present invention comprise trisodium/potassium dicarboxymethylalanine, trisodium/potassium N, N' -ethylenediamine disuccinate, sodium/potassium 2-hydroxyphosphonate acetate, and sodium/potassium benzoate.

In using the dispersant of the present invention, the dispersant is generally added to the saline wastewater in the form of an aqueous solution, and the aforementioned component a, component B, component C, and optionally contained component D in the dispersant function as effective ingredients.

It is understood that, in the present invention, when the component a, the component B, the component C or the component D as the active ingredient is present in the form of a salt of a carboxylic acid compound, the component a, the component B, the component C or the component D contained in the composition of the dispersant may be a salt of a carboxylic acid compound, or a carboxylic acid compound, and the latter is only required to be used in combination with a base (e.g., sodium hydroxide or potassium hydroxide) to form a salt of a corresponding carboxylic acid compound.

The invention comprises a dispersant composition, which is a dry-based formula (powder) of a dispersant, and comprises the effective components of the component A, the component B and the component C, and optionally further comprises the component D. In the present invention, the active ingredient means an ingredient that exerts an effect of inhibiting salt formation and scaling of the back-spray brine. In the lyophobic composition of the invention, when the component D is not contained, the total content of the component a, the component B and the component C is 80 wt% or more, for example 90 wt% or more, based on the total weight of the effective components of the lyophobic composition; when component D is present, the total amount of component A, component B, component C and component D is greater than 80 wt%, such as greater than 90 wt%, based on the total weight of the active ingredients of the lyophobic composition.

The lyophobic compositions of the invention optionally may contain minor amounts of other ingredients, such as low molecular weight anionic polymers, nonionic surfactants, water soluble ferrocyanide salts, copper corrosion inhibitors, and the like.

In some embodiments, the present lyophobic compositions, when component D is not present, the total content of component a, component B, and component C is more than 80 wt%, such as more than 90 wt%, of the total weight of the lyophobic composition; when component D is present, the total amount of component A, component B, component C, and component D is greater than 80 wt%, such as greater than 90 wt%, based on the total weight of the lyophobic composition. In some embodiments, the active ingredient of the lyophobic composition of the invention consists of component a, component B, component C and optionally component D. In some embodiments, the lyophobic composition of the invention consists of component a, component B, component C, and optionally component D.

The dispersing agent of the present invention is an aqueous solution obtained by dissolving the dispersing agent composition in water. The concentration of the dispersant (namely the mass fraction of the dispersant composition in the dispersant) is 10 to 40 weight percent.

The application range of the dispersant or the dispersant composition of the invention includes, but is not limited to, saline wastewater such as saline wastewater generated by an incineration system (herein, simply referred to as incineration wastewater) and saline wastewater generated by acid-base neutralization (herein, simply referred to as acid-base neutralization wastewater).

Herein, the incineration waste water refers to waste water discharged after disposal of an acid washing tower and a neutralization tower in an incineration system, and has a salt content of generally 1 to 25 wt% depending on the material to be incinerated. In some embodiments, the incineration waste water used in the present invention has a salt content of 9 to 15 wt%. In some embodiments, the incineration waste water contains salts in which a sulfate ratio is 50 + -5 wt%, a chloride ratio is 20 + -2 wt%, and a nitrate ratio is 20 + -2 wt%. In some embodiments, the pH of the incineration waste water is from 11 to 14. In some embodiments, the COD of the incineration wastewater is 250,000. + -. 25,000 mg/L. In some embodiments, the total phosphorus of the incineration waste water is 10,000 ± 1,000 mg/L. In some embodiments, the total nitrogen of the incineration waste water is 15,000 ± 1,500 mg/L. In some embodiments, the temperature of incinerating wastewater is 45 ± 5 ℃. In some embodiments, the salt-containing wastewater used in the present invention is incineration wastewater, the salt content is 9-15 wt%, the pH value is 11-14, the salt content is 50 + -5 wt%, the chloride content is 20 + -2 wt%, the nitrate content is 20 + -2 wt%, the Chemical Oxygen Demand (COD) is 250,000 + -25,000 mg/L, the total phosphorus is 10,000 + -1,000 mg/L, the total nitrogen is 15,000 + -1,500 mg/L, and the temperature is 45 + -5 ℃. The dispersing agent or the dispersing agent composition has a very good effect of preventing salt and scale accumulation when used for recycling the incineration wastewater in the quenching tower.

Herein, the acid-base neutralization wastewater refers to wastewater formed by treating acid-base waste liquid generated in industry through neutralization reaction, and the wastewater has relatively complicated components, contains various salts such as chloride, sulfate and nitrate, and the salt content is 10-30 wt%. In some embodiments, the salt content of the acid-base neutralized wastewater used in the present invention is 15 to 30 wt%. In some embodiments, the acid-base neutralization wastewater contains salts such as sulfate 45 + -5 wt%, nitrate 30 + -3 wt%, and chloride 25 + -3 wt%. In some embodiments, the pH of the acid-base neutralized wastewater is from 7 to 9. In some embodiments, the temperature of the acid-base neutralized wastewater is ambient temperature (25 ± 5 ℃). In some embodiments, the salt-containing wastewater used in the present invention is acid-base neutralized wastewater, the salt content is 15-30 wt%, the salt content is 45 + -5 wt%, the nitrate content is 30 + -3 wt%, the chloride content is 25 + -3 wt%, the pH is 7-9, and the temperature is normal temperature (25 + -5 ℃). The dispersant or the dispersant composition has a very good effect of preventing salt deposition and scale deposition when used for recycling acid-base neutralization wastewater in a quenching tower.

When the dispersing agent or the dispersing agent composition is used, before the salt-containing wastewater is sprayed into the quenching tower, the dispersing agent or the dispersing agent composition is added into the salt-containing wastewater, and is uniformly mixed with the salt-containing wastewater and then sprayed into the quenching tower. Preferably, the dispersing agent or the dispersing agent composition is added into a recycled waste brine storage pool or a back spray pipe line, and if the dispersing agent or the dispersing agent composition is added into the back spray pipe line, the dispersing agent or the dispersing agent composition is preferably added into the back spray pipe line at a position which is more than 10m away from a water tank of a quenching tower, so that uniform mixing is ensured.

The dosage of the dispersant is mainly determined according to salt components (such as sulfate, chlorate, nitrate and the like) in the salt-containing wastewater and the content of the salt components, and can be adjusted by referring to some parameters of COD, total phosphorus, total nitrogen, temperature, pH and the like. In the invention, the dosage of the composition of the dispersing agent is calculated according to the dosage of the dispersing agent and the concentration of the dispersing agent.

In some embodiments, the salt-containing wastewater back-sprayed into the quench tower is incineration wastewater with a salt content of 9 to 15 wt%, calculated as the salt content of the salt-containing wastewater, of 0.02kg to 0.045kg of the dispersant of the present invention per ton of salt-containing wastewater per 1 wt% of salt content. In some embodiments, the salt-containing wastewater back-sprayed into the quench tower is incineration wastewater with a salt content of 9-15 wt%, a pH of 11-14, a sulfate ratio of 50 + -5 wt% in the salt, a chloride ratio of 20 + -2 wt%, a nitrate ratio of 20 + -2 wt%, a COD of 250,000 + -25,000 mg/L, a total phosphorus of 10,000 + -1,000 mg/L, a total nitrogen of 15,000 + -1,500 mg/L, a temperature of 45 + -5 ℃, and a salt content of 0.02kg-0.045kg of the dispersant of the present invention per 1 wt% of the salt-containing wastewater, as calculated on the salt content of the salt-containing wastewater.

In some embodiments, the salt-containing wastewater back-sprayed into the quench tower is an acid-base neutralized wastewater having a salt content of 15 to 30 wt%, and 0.02kg to 0.05kg of the dispersant of the present invention is used per ton of salt-containing wastewater per 1 wt% of salt content, calculated from the salt content of the salt-containing wastewater. In some embodiments, the salt-containing wastewater back-sprayed into the quench tower is acid-base neutralization wastewater with a salt content of 15-30 wt%, a sulfate salt content of 45 + -5 wt%, a nitrate salt content of 30 + -3 wt%, a chloride salt content of 25 + -3 wt%, a pH of 7-9, and a normal temperature (25 + -5 deg.C), and the dispersant of the present invention is used at a concentration of 0.02kg-0.05kg per 1 wt% of the salt content of the salt-containing wastewater, as calculated from the salt content of the salt-containing wastewater.

The invention also comprises the application of the dispersant composition or the dispersant as an additive of the saline wastewater in preventing the salt accumulation and scale deposition on the inner wall of the quenching tower when the saline wastewater is sprayed back to the quenching tower.

The invention has the following beneficial technical effects: compared with the prior art, the dispersant containing the carboxylic acid compounds of the component A, the component B, the component C and the optional component D and/or the salts thereof obviously reduces salt formation and scaling of the back-spraying saline water, reduces equipment investment, reduces cost, reduces the frequency of manual intervention caused by directly recycling the saline wastewater, has wider application range, is not only suitable for incinerating the wastewater, but also suitable for acid-base neutralization of the wastewater. The dispersing agent is added into the incineration waste water, an incineration system normally operates for a long time (at least 2 months), the ash discharged by quenching is dry powder, only occasionally adheres to the wall every week, the powder can be removed by using a sharp iron stick, the powder is loose, and the back-sprayed waste salt water hardly adheres to the wall. The dispersing agent is added into acid-base neutralization wastewater, an incineration system normally operates for a long time (at least 1 month), quenched ash is in a dry powder shape, accumulated salt in a quenching tower is obviously reduced compared with the salt without the dispersing agent, the hardness of the accumulated salt is small, and the removing effect of a tool is obvious.

The present invention will be illustrated below by way of specific examples. It should be understood that these examples are illustrative only and are not intended to limit the scope of the present invention. The methods, reagents and materials used in the examples are, unless otherwise indicated, conventional in the art. The starting compounds in the examples are all commercially available.

Example 1

In a certain dangerous waste disposal enterprise in Jiangsu, the daily disposal amount is about 50 tons, the generated salt-containing incineration waste water is about 60 tons, the salt content is 9-15 wt%, the pH value is 11-14, and the salts are mainly sulfate, chloride and the like. Before the dispersing agent is not added, the incineration wastewater is used for back-spraying, salt deposition in the tower is serious and blocky, the back-spraying is about 1 day, the parking maintenance is carried out for manual cleaning, the cleaning difficulty is high, the hardness of the salt deposition lumps is high, the cleaning period (from the parking maintenance, the cleaning and the driving operation) is about one week, and the ash discharged from the bottom of the quenching tower is large blocky salt scale (as shown in figure 1).

And (4) adding a dispersing agent and back-spraying the incineration wastewater in the enterprises. Dissolving trisodium nitrilotriacetate, trisodium hydroxyethylethylenediamine triacetate and sodium 2, 3-dihydroxysuccinate in water at a mass ratio of 15:8:1 to prepare a thinner with the concentration of 20 wt%. The dispersing agent is added into the incineration wastewater at a position which is more than 10m away from the water tank in a pipeline for returning the incineration wastewater to the quenching water tank, so that the two are mixed and dissolved to ensure that the two are uniformly mixed, and the dispersing agent is sprayed into the quenching tower through a quenching spray gun. In the experiment, the salt content of the incineration wastewater is about 15 wt%, the pH value is about 12, the salts in the wastewater comprise about 50 wt% of sulfate, about 20 wt% of chlorate, about 20 wt% of nitrate and other miscellaneous salts, the COD is about 250,000mg/L, the total phosphorus is about 10,000mg/L, the total nitrogen is about 15,000mg/L, the temperature is about 45 ℃, and about 0.5kg of dispersing agent is added into each ton of wastewater.

Within the 2 month experimental period, the whole incineration system was operating normally and the quench ash was dry powder (as shown in figure 2). And opening a manhole of the quenching tower for observation, wherein the blocks are only occasionally attached to the wall every week, and can be detached by using a sharp iron stick, and the blocks are loose. Through calculation, the ash discharge amount of the quenching bag, the cloth bag and the cyclone is basically equivalent to the content of the sprayed salt water, which shows that the back-sprayed waste salt water is hardly attached to the wall.

Example 2

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, ethylene glycol bis (2-aminoethyl ether) tetrasodium tetraacetate and sodium 2, 3-dihydroxysuccinate in a mass ratio of 4:1:10 in water to prepare the dispersing agent with the concentration of 15 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Within a 2 month experimental period, the entire incineration system was operating normally and the quench ash was dry powder, similar to example 1. And opening a manhole of the quenching tower for observation, wherein the blocks are only occasionally attached to the wall every week, and can be detached by using a sharp iron stick, and the blocks are loose. Through calculation, the ash discharge amount of the quenching bag, the cloth bag and the cyclone is basically equivalent to the content of the sprayed salt water, which shows that the back-sprayed waste salt water is hardly attached to the wall.

Example 3

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, trisodium N, N' -ethylenediamine disuccinate and sodium 2, 3-dihydroxysuccinate in a mass ratio of 10:5:5 in water to prepare the dispersant with the concentration of 35 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 4

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, ethylenediamine-N, N' -sodium diacetate and sodium 2, 3-dihydroxysuccinate in water according to the mass ratio of 5:8:2 to prepare the dispersant with the concentration of 30 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 5

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, disodium ethylene diamine tetraacetate and sodium 2, 3-dihydroxysuccinate in water in a mass ratio of 10:2:1 to prepare the dispersing agent with the concentration of 25 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 6

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, tetrasodium ethylenediaminetetraacetate and sodium 2, 3-dihydroxysuccinate in water at a mass ratio of 8:4:4 to prepare the dispersing agent with the concentration of 30 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 7

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving dicarboxymethylalanine trisodium, hydroxyethyl ethylenediamine trisodium triacetate and 2, 3-dihydroxy sodium succinate in a mass ratio of 12:4:1 in water to prepare the dispersant with the concentration of 20 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 8

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving N, N' -di (2-hydroxyethyl) sodium glycinate, hydroxyethyl ethylene diamine triacetic acid trisodium and 2, 3-dihydroxy sodium succinate in a mass ratio of 1:5:9 in water to prepare the dispersant with the concentration of 15 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 9

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving diethylenetriamine pentaacetic acid pentasodium, hydroxyethyl ethylenediamine triacetic acid trisodium and 2, 3-dihydroxy sodium succinate in the mass ratio of 2:3:5 in water to prepare the thinner with the concentration of 10 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 10

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving sodium iminodiacetate, hydroxyethyl ethylenediamine triacetic acid trisodium and 2, 3-dihydroxy sodium succinate in water at a mass ratio of 8:10:2 to prepare the dispersing agent with the concentration of 40 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 11

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, trisodium hydroxyethylethylenediamine triacetate and trisodium citrate in a mass ratio of 3:7:1 in water to prepare the thinner with the concentration of 15 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 12

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, trisodium hydroxyethylethylenediamine triacetate and sodium 2-hydroxyphosphonoacetate in a mass ratio of 2:8:6 in water to prepare the dispersing agent with the concentration of 40 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 13

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, trisodium hydroxyethylethylenediamine triacetate and sodium 2, 3-dihydroxysuccinate in water at a mass ratio of 8:2:2 to prepare a dispersing agent with a concentration of 10 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 14

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, trisodium N, N' -ethylenediamine disuccinate, sodium 2-hydroxyphosphonoate and sodium benzoate in a mass ratio of 5:4:4:1 in water to prepare the dispersant with the concentration of 25 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 15

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate, ethylenediamine-N, N' -sodium diacetate, trisodium citrate and disodium 1, 2-cyclohexanediaminetetraacetate in a mass ratio of 6:5:8:1 in water to prepare the dispersant with the concentration of 20 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

Example 16

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving dicarboxymethylalanine trisodium, N' -ethylenediamine disuccinic acid trisodium, 2-sodium hydroxyphosphonoate and sodium benzoate in a mass ratio of 5:8:10:2 in water to prepare the dispersant with the concentration of 30 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

The ingredients of the dispersants of examples 1-16 are shown in Table 1.

Table 1: components of the dispersants of examples 1-16

In the table, "-" indicates that this component is not contained.

Example 17

Experiments of adding a dispersant to the wastewater and spraying acid and alkali back to the wastewater were performed in the enterprises described in example 1. The salts contained in the acid-base neutralization wastewater mainly comprise nitrate, sulfate and chloride. In the experiment, the salt content of the acid-base neutralization wastewater is about 20 wt%, wherein the sulfate in the salt is about 45 wt%, the nitrate is about 30 wt%, the chloride is about 25 wt%, the pH value is about 8, and the temperature is normal temperature. Because the salt content of the acid-base neutralization wastewater is high, the salt accumulation condition of the acid-base neutralization wastewater direct recycling is poorer than the condition of the incineration wastewater direct recycling, and the salt accumulation is more serious. About 1kg of each of the dispersants of examples 1 to 16 was added to each ton of the acid-base neutralized wastewater, and each experiment was conducted for 1 month. The dosing position was the same as in example 1.

The entire incineration system ran normally and the quench ash was dry powder for the 1 month test period using each of the dispersers of examples 1-16, similar to example 1, indicating that the use of the disperser works well. The manhole of the quenching tower is opened for observation, and the salt content of acid-base neutralization wastewater is higher, so that the salt content of the accumulated blocks in the quenching tower is more than that of the back-spray incineration wastewater, but the addition of the dispersing agent is less, the hardness of the accumulated blocks is lower, the removal effect of a tool is more obvious, and the dispersing agent is also suitable for the back-spray of the acid-base neutralization wastewater.

Comparative example 1

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate in water to prepare the thinner with the concentration of 20 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

The effect is similar to that of the situation that no dispersing agent is added at the beginning of the experiment, occasionally particulate matters fall, no fly ash or particles gradually fall from the bottom of the quenching tower, the falling fly ash particles are large and cannot reach the expected effect after running for about 1 hour, in order to prevent the occurrence of a parking accident, the back spray is suspended on site, the manhole of the quenching tower is opened for observation, the inner scale formation is found to be serious (as shown in figure 3), and the fact that the salt deposition and the scaling of the waste water incinerated by the back spray are almost not prevented by adding the trisodium nitrilotriacetate alone is shown.

Comparative example 2

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium citrate in water to prepare the dispersant with the concentration of 30 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

The effect is similar to that of the additive-free dispersing agent at the beginning of the experiment, occasionally, particulate matters fall, no fly ash or particles gradually fall from the bottom of the quenching tower, the falling fly ash particles are large and cannot reach the expected effect after running for about 1 hour, in order to prevent parking accidents, the back spray is suspended on site, the manhole of the quenching tower is opened for observation, the inner scale is found to be serious, and the effect of preventing the back spray from burning the salt deposition and scaling of the waste water is shown to be almost not achieved by independently adding trisodium citrate.

Comparative example 3

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving sodium gluconate in water to obtain 35 wt% of dispersant. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

The experiment begins with not adding the dispersion agent effect similar, occasionally has the particulate matter to fall, and no fly ash or granule fall by the quench tower bottom gradually, about running 1 hour, the fly ash granule that falls is great, does not reach anticipated effect, for preventing the parking accident, and on-the-spot decision is suspended and is spouted back, opens quench tower manhole and observes, and it is serious to discover inside scale deposit, explains that it hardly hinders the effect that spout burning waste water salt deposition scale deposit to add sodium gluconate alone.

Comparative example 4

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving sodium tartrate and tetrasodium ethylene diamine tetraacetate in a mass ratio of 1:2 in water to prepare the dispersant with the concentration of 30 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

About 1h after the waste water is sprayed back, substances fall from the quenching tower, the ash discharge amount is not in accordance with the spraying amount, the ash discharge amount is in a coin-sized particle shape, and the subsequent ash discharge is not performed any more, which indicates that the system is blocked by serious scale deposition, and indicates that the ideal effect of preventing the salt deposition and scale deposition cannot be achieved by adding two carboxylates, namely sodium tartrate and tetrasodium ethylene diamine tetraacetate into the incineration waste water in a compounding manner.

Comparative example 5

The experiment of adding the dispersing agent and back-spraying the incineration waste water is carried out in the enterprise described in the example 1. Dissolving trisodium nitrilotriacetate and trisodium citrate in a mass ratio of 1:1 in water to prepare the thinner with the concentration of 20 wt%. The position of the added agent, the nature of the waste water from incineration and the amount of the added agent were the same as those in example 1.

About 1h after the waste water is sprayed back, the substances of the quenching tower continuously fall, the ash discharge amount is not accordant with the spraying amount, the ash discharge condition is improved compared with that of the method without adding a dispersing agent and the method in the comparative example 1, the ash discharge is granular with the size of a coin, the ash discharge is not carried out subsequently, the serious scale deposition and blockage system is shown, and the ideal effect of preventing the salt deposition and scale deposition can not be achieved by adding two kinds of carboxylate of trisodium nitrilotriacetate and trisodium citrate into the incineration waste water.

Comparative example 6

Experiments of adding a dispersant to the wastewater and spraying acid and alkali back to the wastewater were performed in the enterprises described in example 1. The salts contained in the acid-base neutralization wastewater mainly comprise nitrate, sulfate and chloride. In the experiment, the salt content of the acid-base neutralization wastewater is about 20 wt%, wherein the sulfate in the salt is about 45 wt%, the nitrate is about 30 wt%, the chloride is about 25 wt%, the pH value is about 8, and the temperature is normal temperature. Dissolving trisodium nitrilotriacetate and trisodium citrate in a mass ratio of 1:1 in water to prepare the thinner with the concentration of 20 wt%. About 1kg of the dispersing agent is added into each ton of acid-base neutralization wastewater, and the experiment is carried out for 1 month. The dosing position was the same as in example 1.

About 1h after the waste water is sprayed back, substances fall from the quenching tower, the ash discharge amount is not accordant with the spraying amount, the ash discharge amount is in a coin-sized particle shape, and the subsequent ash discharge is not performed any more, which indicates that the system is seriously scaled and blocked, and indicates that the ideal effect of preventing salt deposition and scale deposition cannot be achieved by adding the trisodium nitrilotriacetate and the trisodium citrate in acid-base neutralization and waste water.

Claims

1. A lyophobic composition, characterized in that the lyophobic composition comprises the following components:

2. A lyophobic composition according to claim 1, wherein the carboxylic acid compound as the component a contains 2 to 20 carbon atoms, 1 to 5 carboxyl groups and 1 to 5 nitrogen atoms; preferably, component a is selected from one or more of nitrilotriacetic acid and salts thereof, dicarboxymethylalanine and salts thereof, N ' -di (2-hydroxyethyl) glycine and salts thereof, diethylenetriaminepentaacetic acid and salts thereof, and iminodiacetic acid and salts thereof, preferably from one or more of nitrilotriacetic acid, dicarboxymethylalanine, N ' -di (2-hydroxyethyl) glycine, diethylenetriaminepentaacetic acid, iminodiacetic acid, trisodium/potassium nitrilotriacetate, dicarboxymethylalanine trisodium/potassium, N ' -di (2-hydroxyethyl) sodium/potassium glycinate, diethylenetriaminepentaacetic acid pentasodium/potassium, and iminodisodium/potassium.

3. A lyophobic composition according to claim 1, wherein the carboxylic acid compound as the component B contains 2 to 20 carbon atoms, 2 to 6 carboxyl groups and 2 to 6 nitrogen atoms; preferably, the component B is selected from one or more of hydroxyethylethylenediaminetriacetic acid and salts thereof, N '-ethylenediaminedisuccinic acid and salts thereof, ethylenediaminetetraacetic acid and salts thereof, ethylenediamine-N, N' -diacetic acid and salts thereof, and ethylene glycol bis (2-aminoethyl ether) tetraacetic acid and salts thereof, preferably from one or more of hydroxyethylethylenediaminetriacetic acid, N '-ethylenediaminedisuccinic acid, ethylenediaminetetraacetic acid, ethylenediamine-N, N' -diacetic acid, ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, trisodium/potassium hydroxyethylethylenediaminetriacetate, trisodium/potassium N, N '-ethylenediaminedisuccinate, disodium/potassium ethylenediaminetetraacetate, tetrasodium/potassium ethylenediaminetetraacetate, sodium/potassium ethylenediamine-N, N' -diacetate, and tetrasodium/potassium ethylene glycol bis (2-aminoethyl ether) tetraacetate .

4. A lyophobic composition according to claim 1, wherein the carboxylic acid compound as the component C contains 2 to 20 carbon atoms, 1 to 3 carboxyl groups and 1 to 3 hydroxyl groups; preferably, the component C is selected from one or more of citric acid and salts thereof, 2, 3-dihydroxysuccinic acid and salts thereof, and 2-hydroxyphosphonoacetic acid and salts thereof, preferably from one or more of citric acid, 2, 3-dihydroxysuccinic acid, 2-hydroxyphosphonoacetic acid, trisodium/potassium citrate, sodium/potassium 2, 3-dihydroxysuccinate, and sodium/potassium 2-hydroxyphosphonoacetate.

5. The lyophobic composition of claim 1, wherein the lyophobic composition further comprises the following components:

preferably, the mass ratio of component a to component D is from 2:1 to 10: 1.

6. A lyophobic composition according to claim 1, wherein the carboxylic acid compound as the component D contains 7 to 20 carbon atoms and 1 to 4 carboxyl groups; preferably, the component D is selected from one or more of 1, 2-cyclohexanediamine tetraacetic acid and salts thereof and benzoic acid and salts thereof, preferably from one or more of 1, 2-cyclohexanediamine tetraacetic acid, benzoic acid, disodium/potassium 1, 2-cyclohexanediamine tetraacetic acid and sodium/potassium benzoate.

7. A dispersant which is an aqueous solution of the dispersant composition of any one of claims 1 to 6.

8. The dispersant of claim 7 wherein said dispersant is present in a concentration of 10 to 40 wt%.

9. A method for recycling saline wastewater in a quench tower of a solid waste incineration system, comprising adding the composition of claim 1 to 6 or the composition of claim 7 or 8 to the saline wastewater before injecting the saline wastewater into the quench tower, and injecting the saline wastewater into the quench tower after mixing the composition of claim 1 to 6 with the saline wastewater uniformly.

10. The method of claim 9, wherein the salt-containing wastewater is incineration wastewater or acid-base neutralization wastewater.