High-efficiency grey water dispersing agent

A technology of dispersant and gray water, which is applied in descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of unsatisfactory treatment effect, discharge of phosphorus-containing compounds, uneconomical, etc. Achieve the effect of reducing equipment maintenance and production costs, good dispersion ability, and avoiding secondary pollution

Active Publication Date: 2013-05-08
JIANGSU TIANMAI CHEM CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to ensure that the hardness and alkalinity of gray water meet the specified requirements and ensure the normal operation of equipment, in-depth research has been conducted on the treatment agents for circulating water in the coal chemical industry at home and abroad. From the earlier chromium, phosphorus, and molybdenum series, Then to the treatment agent of organic phosphonic acid, but because the compounds containing chromium and phosphorus in chromium series, phosphorus series and molybdenum series have certain harm to human body, such as hexavalent chromate, nitrite, etc. Toxic substances, so the application is greatly restricted; organic phosphonic acid treatment agents can solve problems such as corrosion and calcium carbonate scaling during system operation, but under harsh water quality conditions, organic phosphonic acid treatment agents alone cannot complete For water quality treatment, such as a stable corrosion and scale inhibitor disclosed in patent 200410025673.9, which contains aminotrimethylenephosphonic acid, ethylenediaminetetramethylenephosphonic acid, aminoethylenediphosphonic acid, zinc sulfate and w

Method used

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preparation example Construction

[0041] Preparation of test solution: Add sodium bicarbonate solution (4.7)a with a burette (5.2) 2 mL into a 500mL volumetric flask, transfer 5.00mL water treatment agent sample solution (6.1), add 250mL water, and shake well. Slowly add calcium chloride solution (4.9)a with a burette (5.2) 3 mL, dilute to the mark with water, shake well, and prepare 1L containing 5.00mg of water treatment agent, 240mg (6.00mmol) of calcium ion (Ca 2+ ) and 732mg (12.0mmol) bicarbonate ion (HCO 3 - ) test solution;

[0042] Reagents: ① Potassium hydroxide solution: 200g / L; ② Disodium ethylenediaminetetraacetic acid (EDTA): 0.01mol / L; ③ Hydrochloric acid: 0.1mol / L; ④ Calcein-phenolphthalein mixed indicator: weigh 0.20g Calcein, 0.070g phenolphthalein (GB 10729), put in a glass mortar, add 20g of potassium chloride (GB 646) dried at 120°C, grind and mix well, and store in a brown grinding bottle; Phenol green-methyl red mixed indicator: 3 volumes of 1.00g / L bromocresol green (HG3-1220) etha...

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Abstract

The invention relates to a high-efficiency grey water dispersing agent which is a composition consisting of 40-60 percent of acrylic acid-2-polyscrylide-2-methyl acrylsulfonate, 15-35 percent of 2-phosphate-1,2,4-tricarboxylic acid butane, 5-25 percent of amino trimethylene phosphonic acid, 5-15 percent of hydroxyethylidene-1,1-diphosphonic acid and 5-15 percent of hydrolytic polymaleic anhydride. The dispersing agent is stable in property under the conditions of 40MPa and 250 DEG C, has a high dispersing capacity at the high temperature of 300 DEG C, has a good dispersing function on high-basicity, high-hardness, high-PH value and high ash content and high concentration multiple under the required high-concentration times in a water-coal-slurry pressurization and gasification device, can effectively delay the scale forming tendency and is applicable to a circulating cooling water system in industries such as power, metallurgy and papermaking. The addition in a water system is determined according to the water quality and working conditions, and the amount is 50-80mg/l according to the flow sum of a low-pressure grey water pump and a high-pressure grey water pump.

Description

technical field [0001] The invention relates to a dispersant for anti-scaling of coal chemical industry and industrial circulating water, in particular to a high-efficiency gray water dispersant. Background technique [0002] In the coal chemical industry, the gasification process of coal-water slurry gasification uses coal ash with a high melting point. In order to reduce the ash melting point of coal, a flux CaCO is added. 3 , CaCO 3 Decompose at high temperature to generate CaO, a part of CaO and SiO in coal 2 、Al 2 o 3 and other reactions reduce the ash melting point of coal, and the remaining CaO dissolves in the gas washing water, which greatly increases the calcium hardness and alkalinity in the gas washing water, making gray water a serious combination of high hardness, high alkalinity, and high pH value. Scale-type water quality, resulting in serious scaling of the gray water system. In addition, gray water needs to be heated and pressurized before entering the...

Claims

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Application Information

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IPC IPC(8): C02F5/14
Inventor 周小虎邓立新
Owner JIANGSU TIANMAI CHEM CO LTD
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