High-efficiency ash water dispersant and preparation method thereof

Abstract

The present application relates to the technical field of coal fuel, and discloses a high-efficiency ash water dispersant and a preparation method thereof.The high-efficiency ash water dispersant comprises the following raw materials in mass percentage: 70-80 wt.% of a blended polymer, 10-15 wt.% of a mixed salt, and the balance of water.The ash water dispersant provided by the present application has a scale inhibition rate of 95.2%, a corrosion rate of 0.0027 mm / a, and excellent dispersibility, scale inhibition and corrosion inhibition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal fuel, in particular to a high-efficiency ash water dispersant and a preparation method thereof. BACKGROUND

[0002] The ash water dispersant for coal gasification is a chemical substance specially used for treating ash water and preventing equipment and pipeline from scaling in the coal gasification process. In the coal gasification process, the ash water usually has the characteristics of high hardness, high turbidity and high alkalinity, and is easy to form deposits, scaling and corrosion in the equipment, thereby affecting the normal operation and service life of the equipment. Therefore, the ash water needs to be treated so that the main scale-forming substances in the ash water can be uniformly dispersed in the aqueous solution.

[0003] However, some existing ash water dispersants have poor dispersing effect and poor scale inhibition, and do not have corrosion inhibition effect. Therefore, it becomes a technical problem to be solved by those skilled in the art to provide a high-efficiency ash water dispersant with excellent dispersing effect, scale inhibition and corrosion inhibition. SUMMARY

[0004] The purpose of the present application is to provide a high-efficiency ash water dispersant and a preparation method thereof, which has excellent dispersing effect, scale inhibition and corrosion inhibition.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0006] One of the technical solutions of the present application is as follows:

[0007] The high-efficiency ash water dispersant comprises the following raw materials in mass percentage: 70-80wt.% of a blended polymer, 10-15wt.% of a mixed salt, and the balance of water.

[0008] Further, the preparation method of the blended polymer comprises the following steps:

[0009] 1) heating maleic anhydride, then adding phosphine reagent SHP, acrylic acid, sodium methallyl sulfonate and potassium persulfate initiator dropwise into the maleic anhydride, and reacting to obtain a modified maleic acid-acrylic acid copolymer;

[0010] 2) dissolving hydroxyethyl cellulose in water and ultrasonic dispersing to obtain a hydroxyethyl cellulose dispersion;

[0011] 3) adding the modified maleic acid-acrylic acid copolymer obtained in step 1), acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine into the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonic dispersing to obtain the blended polymer.

[0012] Further, in the step 1), the molar ratio of the maleic anhydride, the phosphine agent SHP, the acrylic acid and the sodium methallyl sulfonate is (2-3):(2-3):(5-8):(1-2).

[0013] Further, in the step 1), the heating is heating to 70℃.

[0014] Further, in the step 1), the dropping speed of the dropping is 20-40 d / min.

[0015] Further, in the step 1), the reaction is: reacting at 90℃ for 3-5 h.

[0016] Further, in the step 3), the molar ratio of the modified maleic acid-acrylic acid copolymer, the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, the polyether amine and the hydroxyethyl cellulose is (2-4):(1-2):(0.5-1):(6-8).

[0017] Further, the preparation method of the mixed salt comprises the following steps:

[0018] The sodium dodecyl benzene sulfonate, the sodium citrate and the sodium tartrate are mixed to obtain the mixed salt.

[0019] Further, the molar ratio of the sodium dodecyl benzene sulfonate, the sodium citrate and the sodium tartrate is 1:(3-5):(6:8).

[0020] The second technical scheme of the present application is:

[0021] The preparation method of the high-efficiency grey water dispersant comprises the following steps:

[0022] The mixed salt is dissolved in water to obtain a mixed salt solution, and then the mixed salt solution is added dropwise into the blended polymer and stirred to obtain the high-efficiency grey water dispersant.

[0023] Further, the dropping speed of the dropping is 50-60 d / min.

[0024] Further, the stirring is stirring at room temperature for 30-60 min.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The grey water dispersant provided by the present application has a scale inhibition rate of 95.2%, a corrosion rate of 0.0027 mm / a, and excellent dispersing property, scale inhibition and corrosion inhibition. DETAILED DESCRIPTION

[0027] The following detailed description of various example embodiments of the application will not be considered limiting of the application, but rather as a description of certain aspects, features and embodiments of the application. It should be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] In addition, for numerical ranges recited herein, every integer value within the range is to be considered as having been specifically recited. In any statement of a range, any intervening value or intervening values between the upper and lower limits of that range is also specifically contemplated. The upper and lower limits of these intervening ranges can independently be included or excluded in the range.

[0029] Unless otherwise defined, 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 application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, the preferred methods and materials are described. All publications mentioned herein are incorporated by reference to disclose and describe the methods and / or materials in connection with which the publications are cited. The citation of any reference is not an admission that it is prior art with respect to the present application.

[0030] Many modifications and variations of this application of the application can be made without departing from its spirit or scope, which will be apparent to those skilled in the art. Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only. It is to be understood that the application is not limited in scope by the

[0031] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or variations thereof, are intended to be open-ended terms that mean inclusion, but not limited to, the listed materials and methods.

[0032] In the following examples, the polyetheramine is polyetheramine D230.

[0033] In the following examples, a method for preparing a high-efficiency grey water dispersant includes the following steps:

[0034] 1. Preparation of the blended polymer

[0035] 1) According to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacryl sulfonate is (2-3):(2-3):(5-8):(1-2), first heat the maleic anhydride to 70°C, then control the drop rate to 20-40 d / min, drop the phosphine agent SHP, acrylic acid, sodium methacryl sulfonate and potassium persulfate initiator into the maleic anhydride, and react at 90°C for 3-5 h to obtain a modified maleic acid-acrylic acid copolymer;

[0036] 2) Dissolve hydroxyethyl cellulose in water, ultrasonic dispersion for 30 min to obtain hydroxyethyl cellulose dispersion solution;

[0037] 3) According to the molar ratio of modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is (2-4):(1-2):(0.5-1):(6-8), the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) are added to the hydroxyethyl cellulose dispersion solution obtained in step 2), ultrasonic dispersion for 30 min to obtain a blended polymer;

[0038] 2, Preparation of mixed salt

[0039] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate is 1:(3-5):(6:8), sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate are mixed to obtain a mixed salt;

[0040] 3, Preparation of high-efficiency gray water dispersant

[0041] 1) According to the mass percentage of blended polymer 70-80wt.%, mixed salt 10-15wt.% and water balance, weigh each raw material;

[0042] 2) Dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain a mixed salt solution, then control the drop rate to 50-60d / min, add the mixed salt solution to the blended polymer weighed in step 1), stir at room temperature for 30-60 min to obtain the high-efficiency gray water dispersant.

[0043] Example 1

[0044] A high-efficiency gray water dispersant

[0045] 1, Preparation of blended polymer

[0046] 1) According to the molar ratio of maleic anhydride, phosphine reagent SHP, acrylic acid and sodium methacrylsulfonate is 2:2:5:1, first heat maleic anhydride to 70℃, then control the drop rate to 20d / min, add phosphine reagent SHP, acrylic acid, sodium methacrylsulfonate and potassium persulfate initiator to maleic anhydride, and react at 90℃ for 3h to obtain modified maleic acid-acrylic acid copolymer;

[0047] 2) Dissolve hydroxyethyl cellulose in water, ultrasonic dispersion for 30 min to obtain hydroxyethyl cellulose dispersion solution;

[0048] 3) according to the molar ratio of modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is 2:1:0.5:6, the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) are added to the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonic dispersion is carried out for 30 min to obtain a blended polymer;

[0049] 2, preparation of mixed salt

[0050] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate is 1:3:6, sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate are mixed to obtain a mixed salt;

[0051] 3, preparation of high-efficiency grey water dispersant

[0052] 1) according to the mass percentage of blended polymer 70wt.%, mixed salt 10wt.% and water balance, the raw materials are weighed;

[0053] 2) the mixed salt weighed in step 1) is dissolved in the water weighed in step 1) to obtain a mixed salt solution, then the mixed salt solution is added dropwise to the blended polymer weighed in step 1) at a drop rate of 50d / min, and stirring is carried out at room temperature for 30 min to obtain the high-efficiency grey water dispersant.

[0054] Example 2

[0055] A high-efficiency grey water dispersant

[0056] 1, preparation of blended polymer

[0057] 1) according to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacrylsulfonate is 2.5:2.5:7:1.5, the maleic anhydride is heated to 70℃, then the phosphine agent SHP, acrylic acid, sodium methacrylsulfonate and potassium persulfate initiator are added dropwise to the maleic anhydride at a drop rate of 30d / min, and the reaction is carried out at 90℃ for 4h to obtain a modified maleic acid-acrylic acid copolymer;

[0058] 2) the hydroxyethyl cellulose is dissolved in water, and ultrasonic dispersion is carried out for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0059] 3) according to the molar ratio of modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is 3:1.5:0.7:6.5, the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) are added to the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonic dispersion is carried out for 30 min to obtain a blended polymer;

[0060] 2. Preparation of mixed salt

[0061] Sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate were mixed according to the molar ratio of 1:4:7 to obtain the mixed salt;

[0062] 3. Preparation of high-efficiency grey water dispersant

[0063] 1) The raw materials were weighed according to the mass percentage of 75wt.% of blended polymer, 12wt.% of mixed salt and the balance of water;

[0064] 2) The mixed salt weighed in step 1) was dissolved in the water weighed in step 1) to obtain a mixed salt solution, and then the mixed salt solution was added dropwise into the blended polymer weighed in step 1) at a drop rate of 55d / min, and stirred at room temperature for 40min to obtain the high-efficiency grey water dispersant.

[0065] Example 3

[0066] A high-efficiency grey water dispersant

[0067] 1. Preparation of blended polymer

[0068] 1) Maleic anhydride was heated to 70℃, and then phosphine reagent SHP, acrylic acid and sodium methacryl sulfonate were added dropwise into the maleic anhydride at a drop rate of 40d / min according to the molar ratio of 3:3:8:2, and the reaction was carried out at 90℃ for 5h to obtain a modified maleic acid-acrylic acid copolymer;

[0069] 2) Hydroxyethyl cellulose was dissolved in water and ultrasonically dispersed for 30min to obtain a hydroxyethyl cellulose dispersion;

[0070] 3) The modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) were added into the hydroxyethyl cellulose dispersion obtained in step 2) according to the molar ratio of 4:2:1:8, and ultrasonically dispersed for 30min to obtain the blended polymer;

[0071] 2. Preparation of mixed salt

[0072] Sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate were mixed according to the molar ratio of 1:5:8 to obtain the mixed salt;

[0073] 3. Preparation of high-efficiency grey water dispersant

[0074] 1) According to the mass percentage of 80wt.% of the blended polymer, 15wt.% of the mixed salt and the balance of water, each raw material was weighed;

[0075] 2) The mixed salt weighed in step 1) was dissolved in the water weighed in step 1) to obtain a mixed salt solution, and then the mixed salt solution was added dropwise to the blended polymer weighed in step 1) at a drop rate of 60d / min, and stirred at room temperature for 60min to obtain the high-efficiency grey water dispersant.

[0076] Comparative Example 1

[0077] A grey water dispersant

[0078] 1. Preparation of a blended polymer

[0079] 1) According to the molar ratio of maleic anhydride, acrylic acid and sodium methallyl sulfonate being 2.5:7:1.5, the maleic anhydride was heated to 70℃, and then the acrylic acid, sodium methallyl sulfonate and potassium persulfate initiator were added dropwise to the maleic anhydride at a drop rate of 30d / min, and reacted at 90℃ for 4h to obtain a modified maleic acid-acrylic acid copolymer;

[0080] 2) The hydroxyethyl cellulose was dissolved in water and ultrasonically dispersed for 30min to obtain a hydroxyethyl cellulose dispersion;

[0081] 3) According to the molar ratio of the modified maleic acid-acrylic acid copolymer, the acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, the polyether amine and the hydroxyethyl cellulose being 3:1.5:0.7:6.5, the modified maleic acid-acrylic acid copolymer, the acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and the polyether amine obtained in step 1) were added to the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonically dispersed for 30min to obtain a blended polymer;

[0082] 2. Preparation of a mixed salt

[0083] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate being 1:4:7, the sodium dodecyl benzene sulfonate, the sodium citrate and the sodium tartrate were mixed to obtain a mixed salt;

[0084] 3. Preparation of a grey water dispersant

[0085] 1) According to the mass percentage of 75wt.% of the blended polymer, 12wt.% of the mixed salt and the balance of water, each raw material was weighed;

[0086] 2) Dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain a mixed salt solution, then control the drop rate to be 55 d / min, drop the mixed salt solution into the blended polymer weighed in step 1), stir at room temperature for 40 min to obtain the grey water dispersant.

[0087] Comparative Example 2

[0088] A grey water dispersant

[0089] 1. Preparation of a blended polymer

[0090] 1) According to the molar ratio of maleic anhydride, phosphine agent SHP and acrylic acid being 2.5:2.5:7, first heat the maleic anhydride to 70°C, then control the drop rate to be 30 d / min, drop the phosphine agent SHP, acrylic acid and potassium persulfate initiator into the maleic anhydride, react at 90°C for 4 h to obtain a modified maleic acid-acrylic acid copolymer;

[0091] 2) Dissolve the hydroxyethyl cellulose in water, ultrasonic dispersion for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0092] 3) According to the molar ratio of the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyether amine and hydroxyethyl cellulose being 3:1.5:0.7:6.5, add the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and polyether amine obtained in step 1) into the hydroxyethyl cellulose dispersion obtained in step 2), ultrasonic dispersion for 30 min to obtain a blended polymer;

[0093] 2. Preparation of a mixed salt

[0094] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate being 1:4:7, mix the sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate to obtain a mixed salt;

[0095] 3. Preparation of a grey water dispersant

[0096] 1) According to the mass percentage of the blended polymer 75 wt.%, the mixed salt 12 wt.% and the balance of water, weigh each raw material;

[0097] 2) Dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain a mixed salt solution, then control the drop rate to be 55 d / min, drop the mixed salt solution into the blended polymer weighed in step 1), stir at room temperature for 40 min to obtain the grey water dispersant.

[0098] Comparative Example 3

[0099] A grey water dispersant

[0100] 1. Preparation of the blended polymer

[0101] 1) According to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methallyl sulfonate being 1:2.5:7:1.5, maleic anhydride was heated to 70°C first, then the phosphine agent SHP, acrylic acid, sodium methallyl sulfonate and potassium persulfate initiator were added dropwise into maleic anhydride at a controlled drop rate of 30 d / min, and reacted at 90°C for 4h to obtain a modified maleic acid-acrylic acid copolymer;

[0102] 2) Hydroxyethyl cellulose was dissolved in water and ultrasonically dispersed for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0103] 3) According to the molar ratio of the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyether amine and hydroxyethyl cellulose being 3:1.5:0.7:6.5, the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and polyether amine obtained in step 1) were added to the hydroxyethyl cellulose dispersion obtained in step 2) and ultrasonically dispersed for 30 min to obtain a blended polymer;

[0104] 2. Preparation of the mixed salt

[0105] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate being 1:4:7, sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate were mixed to obtain a mixed salt;

[0106] 3. Preparation of the grey water dispersant

[0107] 1) According to the mass percentage of the blended polymer 75 wt.%, the mixed salt 12 wt.% and the balance of water, the raw materials were weighed;

[0108] 2) The mixed salt weighed in step 1) was dissolved in the water weighed in step 1) to obtain a mixed salt solution, then the mixed salt solution was added dropwise into the blended polymer weighed in step 1) at a controlled drop rate of 55 d / min, and stirred at room temperature for 40 min to obtain the grey water dispersant.

[0109] Comparative Example 4

[0110] A grey water dispersant

[0111] 1. Preparation of the blended polymer

[0112] 1) according to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacrylsulfonate is 4:2.5:7:1.5, maleic anhydride is heated to 70℃ first, then control the drop rate is 30d / min, drop the phosphine agent SHP, acrylic acid, sodium methacrylsulfonate and potassium persulfate initiator into the maleic anhydride, react for 4h at 90℃, get the modified maleic acid-acrylic acid copolymer;

[0113] 2) dissolve the hydroxyethyl cellulose in water, ultrasonic dispersion for 30min, get the hydroxyethyl cellulose dispersion;

[0114] 3) according to the molar ratio of modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is 3:1.5:0.7:6.5, add the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and polyether amine obtained in step 1) into the hydroxyethyl cellulose dispersion obtained in step 2), ultrasonic dispersion for 30min, get the blended polymer;

[0115] 2, preparation of mixed salt

[0116] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate is 1:4:7, mix sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate, get the mixed salt;

[0117] 3, preparation of grey water dispersant

[0118] 1) according to the mass percentage of blended polymer 75wt.%, mixed salt 12wt.% and water balance, weigh each raw material;

[0119] 2) dissolve the mixed salt weighed in step 1) in the water weighed in step 1), get the mixed salt solution, then control the drop rate is 55d / min, drop the mixed salt solution into the blended polymer weighed in step 1), stir for 40min at room temperature, get the grey water dispersant.

[0120] Comparative example 5

[0121] A grey water dispersant

[0122] 1, preparation of blended polymer

[0123] 1) dissolve the hydroxyethyl cellulose in water, ultrasonic dispersion for 30min, get the hydroxyethyl cellulose dispersion;

[0124] 2) According to the molar ratio of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyetheramine and hydroxyethyl cellulose being 1.5:0.7:6.5, the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and the polyetheramine are added into the hydroxyethyl cellulose dispersion solution obtained in step 2), and ultrasonic dispersion is performed for 30 min to obtain a blended polymer;

[0125] 2, Preparation of mixed salt

[0126] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate being 1:4:7, the sodium dodecyl benzene sulfonate, the sodium citrate and the sodium tartrate are mixed to obtain a mixed salt;

[0127] 3, Preparation of grey water dispersant

[0128] 1) According to the mass percentage of the blended polymer 75 wt.%, the mixed salt 12 wt.% and the balance of water, the raw materials are weighed;

[0129] 2) The mixed salt weighed in step 1) is dissolved in the water weighed in step 1) to obtain a mixed salt solution, and then the mixed salt solution is added dropwise into the blended polymer weighed in step 1) at a drop rate of 55 d / min, and stirring is performed at room temperature for 40 min to obtain the grey water dispersant.

[0130] Comparative Example 6

[0131] A grey water dispersant

[0132] 1, Preparation of blended polymer

[0133] 1) According to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacrylsulfonate being 2.5:2.5:7:1.5, the maleic anhydride is heated to 70°C, and then the phosphine agent SHP, the acrylic acid, the sodium methacrylsulfonate and the potassium persulfate initiator are added dropwise into the maleic anhydride at a drop rate of 30 d / min, and reaction is performed at 90°C for 4 h to obtain a modified maleic acid-acrylic acid copolymer;

[0134] 2) The hydroxyethyl cellulose is dissolved in water, and ultrasonic dispersion is performed for 30 min to obtain a hydroxyethyl cellulose dispersion solution;

[0135] 3) According to the molar ratio of the modified maleic acid-acrylic acid copolymer, the polyetheramine and the hydroxyethyl cellulose being 3:0.7:6.5, the modified maleic acid-acrylic acid copolymer and the polyetheramine obtained in step 1) are added into the hydroxyethyl cellulose dispersion solution obtained in step 2), and ultrasonic dispersion is performed for 30 min to obtain a blended polymer;

[0136] 2, Preparation of mixed salt

[0137] The sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate were mixed according to the molar ratio of 1:4:7 to obtain a mixed salt;

[0138] 3. Preparation of the grey water dispersant

[0139] 1) The raw materials were weighed according to the mass percentage of 75wt.% of the blended polymer, 12wt.% of the mixed salt and the balance of water;

[0140] 2) The mixed salt weighed in step 1) was dissolved in the water weighed in step 1) to obtain a mixed salt solution, and then the mixed salt solution was added dropwise into the blended polymer weighed in step 1) at a drop rate of 55d / min, and stirred at room temperature for 40min to obtain the grey water dispersant.

[0141] Comparative Example 7

[0142] A grey water dispersant

[0143] 1. Preparation of the blended polymer

[0144] 1) The maleic anhydride, phosphine agent SHP, acrylic acid and sodium methallyl sulfonate were added dropwise into the maleic anhydride heated to 70℃ according to the molar ratio of 2.5:2.5:7:1.5 at a drop rate of 30d / min, and reacted at 90℃ for 4h to obtain a modified maleic acid-acrylic acid copolymer;

[0145] 2) The hydroxyethyl cellulose was dissolved in water and ultrasonically dispersed for 30min to obtain a hydroxyethyl cellulose dispersion;

[0146] 3) The modified maleic acid-acrylic acid copolymer and the acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer obtained in step 1) were added into the hydroxyethyl cellulose dispersion obtained in step 2) according to the molar ratio of 3:1.5:6.5, and ultrasonically dispersed for 30min to obtain the blended polymer;

[0147] 2. Preparation of the mixed salt

[0148] The sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate were mixed according to the molar ratio of 1:4:7 to obtain a mixed salt;

[0149] 3. Preparation of the grey water dispersant

[0150] 1) The raw materials were weighed according to the mass percentage of 75wt.% of the blended polymer, 12wt.% of the mixed salt and the balance of water;

[0151] 2) Dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain a mixed salt solution, then control the drop rate to be 55 d / min, drop the mixed salt solution into the blended polymer weighed in step 1), stir at room temperature for 40 min to obtain the grey water dispersant.

[0152] Comparative Example 8

[0153] A grey water dispersant

[0154] 1. Preparation of a blended polymer

[0155] 1) According to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacrylsulfonate being 2.5:2.5:7:1.5, first heat the maleic anhydride to 70°C, then control the drop rate to be 30 d / min, drop the phosphine agent SHP, acrylic acid, sodium methacrylsulfonate and potassium persulfate initiator into the maleic anhydride, react at 90°C for 4 h to obtain a modified maleic acid-acrylic acid copolymer;

[0156] 2) Dissolve the hydroxyethyl cellulose in water, ultrasonic dispersion for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0157] 3) According to the molar ratio of the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose being 3:1.5:0.7:6.5, add the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) into the hydroxyethyl cellulose dispersion obtained in step 2), ultrasonic dispersion for 30 min to obtain a blended polymer;

[0158] 2. Preparation of a mixed salt

[0159] According to the molar ratio of sodium citrate and sodium tartrate being 4:7, mix the sodium citrate and sodium tartrate to obtain a mixed salt;

[0160] 3. Preparation of a grey water dispersant

[0161] 1) According to the mass percentage of the blended polymer 75 wt.%, the mixed salt 12 wt.% and the balance of water, weigh each raw material;

[0162] 2) Dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain a mixed salt solution, then control the drop rate to be 55 d / min, drop the mixed salt solution into the blended polymer weighed in step 1), stir at room temperature for 40 min to obtain the grey water dispersant.

[0163] Comparative Example 9

[0164] A grey water dispersant

[0165] 1. Preparation of a blended polymer

[0166] 1) According to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methallyl sulfonate being 2.5:2.5:7:1.5, maleic anhydride was heated to 70℃ first, then the dropping speed was controlled to be 30 d / min, the phosphine agent SHP, acrylic acid, sodium methallyl sulfonate and potassium persulfate initiator were added dropwise into the maleic anhydride, and reacted at 90℃ for 4h to obtain a modified maleic acid-acrylic acid copolymer;

[0167] 2) Hydroxyethyl cellulose was dissolved in water and ultrasonically dispersed for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0168] 3) According to the molar ratio of the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose being 3:1.5:0.7:6.5, the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) were added into the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonically dispersed for 30 min to obtain a blended polymer;

[0169] 2. Preparation of a mixed salt

[0170] According to the molar ratio of sodium dodecyl benzene sulfonate and sodium tartrate being 1:7, sodium dodecyl benzene sulfonate and sodium tartrate were mixed to obtain a mixed salt;

[0171] 3. Preparation of a grey water dispersant

[0172] 1) According to the mass percentage of the blended polymer 75wt.%, the mixed salt 12wt.% and the balance of water, the raw materials were weighed;

[0173] 2) The mixed salt weighed in step 1) was dissolved in the water weighed in step 1) to obtain a mixed salt solution, then the dropping speed was controlled to be 55 d / min, the mixed salt solution was added dropwise into the blended polymer weighed in step 1), and stirred at room temperature for 40 min to obtain the grey water dispersant.

[0174] Comparative Example 10

[0175] A grey water dispersant

[0176] 1. Preparation of a blended polymer

[0177] 1) according to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacryl sulfonate is 2.5:2.5:7:1.5, first heat the maleic anhydride to 70℃, then control the drop rate to 30d / min, drop the phosphine agent SHP, acrylic acid, sodium methacryl sulfonate and potassium persulfate initiator into the maleic anhydride, react for 4h at 90℃, to obtain the modified maleic acid-acrylic acid copolymer;

[0178] 2) dissolve the hydroxyethyl cellulose in water, ultrasonic dispersion for 30min, to obtain the hydroxyethyl cellulose dispersion;

[0179] 3) according to the molar ratio of the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is 3:1.5:0.7:6.5, add the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) into the hydroxyethyl cellulose dispersion obtained in step 2), ultrasonic dispersion for 30min, to obtain the blended polymer;

[0180] 2, preparation of mixed salt

[0181] According to the molar ratio of sodium dodecyl benzene sulfonate and sodium citrate is 1:4, mix the sodium dodecyl benzene sulfonate and sodium citrate, to obtain the mixed salt;

[0182] 3, preparation of grey water dispersant

[0183] 1) according to the mass percentage of the blended polymer 75wt.%, mixed salt 12wt.% and water balance, weigh the raw materials;

[0184] 2) dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain the mixed salt solution, then control the drop rate to 55d / min, drop the mixed salt solution into the blended polymer weighed in step 1), stir for 40min at room temperature, to obtain the grey water dispersant.

[0185] Comparative example 11

[0186] A grey water dispersant

[0187] 1, preparation of blended polymer

[0188] 1) according to the molar ratio of maleic anhydride, phosphine agent SHP, acrylic acid and sodium methacryl sulfonate is 2.5:2.5:7:1.5, first heat the maleic anhydride to 70℃, then control the drop rate to 30d / min, drop the phosphine agent SHP, acrylic acid, sodium methacryl sulfonate and potassium persulfate initiator into the maleic anhydride, react for 4h at 90℃, to obtain the modified maleic acid-acrylic acid copolymer;

[0189] 2) Dissolve hydroxyethyl cellulose in water, ultrasonic dispersion for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0190] 3) According to the molar ratio of modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is 3:1.5:0.7:6.5, the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) are added to the hydroxyethyl cellulose dispersion obtained in step 2), ultrasonic dispersion for 30 min to obtain a blended polymer;

[0191] 2, Preparation of mixed salt

[0192] According to the molar ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate is 1:4:7, sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate are mixed to obtain a mixed salt;

[0193] 3, Preparation of grey water dispersant

[0194] 1) According to the mass percentage of blended polymer 65wt.%, mixed salt 22wt.% and water balance, weigh each raw material;

[0195] 2) Dissolve the mixed salt weighed in step 1) in the water weighed in step 1) to obtain a mixed salt solution, then control the drop rate to be 55d / min, add the mixed salt solution to the blended polymer weighed in step 1), stir at room temperature for 40 min to obtain the grey water dispersant.

[0196] Comparative Example 12

[0197] A grey water dispersant

[0198] 1, Preparation of blended polymer

[0199] 1) According to the molar ratio of maleic anhydride, phosphine reagent SHP, acrylic acid and sodium methacrylsulfonate is 2.5:2.5:7:1.5, first heat the maleic anhydride to 70℃, then control the drop rate to be 30d / min, add the phosphine reagent SHP, acrylic acid, sodium methacrylsulfonate and potassium persulfate initiator to the maleic anhydride, and react at 90℃ for 4h to obtain a modified maleic acid-acrylic acid copolymer;

[0200] 2) Dissolve hydroxyethyl cellulose in water, ultrasonic dispersion for 30 min to obtain a hydroxyethyl cellulose dispersion;

[0201] 3) according to the mole ratio of modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine and hydroxyethyl cellulose is 3:1.5:0.7:6.5, the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer and polyether amine obtained in step 1) are added to the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonic dispersion is carried out for 30 min to obtain a blended polymer;

[0202] 2, preparation of mixed salt

[0203] According to the mole ratio of sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate is 1:4:7, sodium dodecyl benzene sulfonate, sodium citrate and sodium tartrate are mixed to obtain a mixed salt;

[0204] 3, preparation of grey water dispersant

[0205] 1) according to the mass percentage of blended polymer 83wt.%, mixed salt 4wt.% and water balance, the raw materials are weighed;

[0206] 2) the mixed salt weighed in step 1) is dissolved in the water weighed in step 1) to obtain a mixed salt solution, then the mixed salt solution is added dropwise to the blended polymer weighed in step 1) at a drop rate of 55d / min, and stirring is carried out at room temperature for 40 min to obtain the grey water dispersant.

[0207] Effect verification

[0208] The grey water dispersants prepared in examples 1-3 and comparative examples 1-12 are added to grey water, and the scale inhibition rate and corrosion rate of the grey water dispersant are detected;

[0209] The scale inhibition rate is detected according to HG / T 2024-2009, and the corrosion rate is detected according to GB 50050-2017;

[0210] The detection results of scale inhibition rate and corrosion rate are shown in table 1;

[0211] Table 1 detection results of scale inhibition rate and corrosion rate

[0212]

[0213]

[0214] From the data in table 1, it can be seen that the scale inhibition rate of the grey water dispersant provided by the application can reach 95.2%, and the corrosion rate can reach 0.0027mm / a, which has excellent dispersing property, scale inhibition and corrosion inhibition.

[0215] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A high efficiency grey water dispersant characterized in that, The high-efficiency grey water dispersant comprises the following raw materials in mass percentage: 70-80 wt.% of the blended polymer, 10-15 wt.% of the mixed salt, and the balance of water; The preparation method of the blended polymer comprises the following steps: 1) heating maleic anhydride, then dropping phosphine reagent SHP, acrylic acid, sodium methallyl sulfonate, and potassium persulfate initiator into the maleic anhydride, and reacting to obtain a modified maleic acid-acrylic acid copolymer; 2) dissolving hydroxyethyl cellulose in water and ultrasonic dispersing to obtain a hydroxyethyl cellulose dispersion; 3) adding the modified maleic acid-acrylic acid copolymer obtained in step 1), acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, and polyether amine into the hydroxyethyl cellulose dispersion obtained in step 2), and ultrasonic dispersing to obtain the blended polymer; The preparation method of the mixed salt comprises the following step: mixing sodium dodecyl benzene sulfonate, sodium citrate, and sodium tartrate to obtain the mixed salt.

2. A high efficiency grey water dispersant according to claim 1, characterized in that, In step 1), the molar ratio of the maleic anhydride, phosphine reagent SHP, acrylic acid, and sodium methallyl sulfonate is (2-3):(2-3):(5-8):(1-2).

3. A high efficiency grey water dispersant according to claim 1, characterized in that, In step 1), the heating is heating to 70°C.

4. A high efficiency grey water dispersant according to claim 1, characterized in that, In step 1), the dropping speed of the dropping is 20-40 d / min.

5. A high efficiency grey water dispersant according to claim 1, characterized in that, In step 1), the reaction is reacting at 90°C for 3-5 h.

6. A high efficiency grey water dispersant according to claim 1, characterized in that, In step 3), the molar ratio of the modified maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polyether amine, and hydroxyethyl cellulose is (2-4):(1-2):(0.5-1):(6-8).

7. A high efficiency grey water dispersant according to claim 1, characterized in that, The molar ratio of the sodium dodecyl benzene sulfonate, sodium citrate, and sodium tartrate is 1:(3-5):(6-8).

8. A process for the preparation of the high efficiency grey water dispersant as claimed in any one of claims 1 to 7, characterized in that, comprises the following steps: dissolving the mixed salt in water to obtain a mixed salt solution, then dropping the mixed salt solution into the blended polymer, and stirring to obtain the high-efficiency grey water dispersant.

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