High-efficiency grey water dispersing agent

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...

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Problems solved by technology

[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, leading to serious scaling of gray water system

In addition, gray water needs to be heated and pressurized before entering the gasifier, Venturi scrubber, and scrubber, which increases the difficulty of scale inhibition and dispersion treatment of gray water. Severe scaling often causes the device to run continuously for a short period of time. It is necessary to stop production for descaling, which seriously affects the normal operation of the equipment

[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 water, It is a compound scale inhibitor of organic phosphonic acid and inorganic salt. When treating gray water, amino trimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid and amino ethylene diphosphonic acid are used in large amounts. But at the same time, a large amount of phosphorus-containing compounds will be discharged, forming new pollution, and excess zinc salts will also cause certain impacts; copolymer scale inhibitors and dispersants are new types of water treatment agents developed in recent years, and their phosphorus-free formula is not It will cause secondary pollution, but its single treatment effect is not ideal, the dosage is large and the price is high, uneconomical, so it is often used in combination with other treatment agents, such as the polymer gray water stabilizer disclosed in patent 200610083815.6, which uses Sulfonate copolymer, aminotrimethylene phosphonic acid, hydroxyethylidene diphosphonic acid, and polymaleic anhydride are used in combination, but because the types and contents of the components do not completely match, it is not ideal for the treatment of some harsh water quality

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