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Combined scale inhibition dispersant for coal gasification system and application method thereof

A technology of anti-scaling dispersant and application method, which is applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., and can solve the problem of low tolerance of calcium ions, iron ions and silicate ions , The scale inhibition and dispersion performance of water treatment chemicals are not ideal, and the water treatment effect cannot be achieved, so as to achieve good chemical stability, prevent and alleviate the formation of scale flakes, and improve the effect and performance.

Active Publication Date: 2019-01-11
宁夏神耀科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the scale inhibitors and dispersants commonly used in the market have played a certain role in preventing scaling in industrial water, there are still many defects and deficiencies, such as low tolerance to calcium ions, iron ions and silicate ions in water
Especially in the coal gasification industry, because the water quality of the coal gasification system has the characteristics of high temperature, high hardness, high pH and high alkalinity, the fouling tendency is very strong. The scale inhibition and dispersion performance of general water treatment chemicals are not ideal, and it is difficult to really play a role in complex working conditions of high temperature, high pressure and poor water quality, and the expected water treatment effect cannot be achieved, and the addition method is single and untargeted

Method used

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  • Combined scale inhibition dispersant for coal gasification system and application method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Step 1. Dissolve 100g of maleic anhydride in 200g of water, stir and heat, and gradually add 12g of initiator ferrous ammonium sulfate, control the reaction temperature at 100°C, and carry out polymerization reaction for 5 hours;

[0036] Step 2. Cool down the system. When the temperature drops to 60°C, gradually add 50g of ethylenediaminetetramethylenephosphonic acid and 100g of water into the solution, and stir for 30 minutes to obtain scale inhibitor dispersant I;

[0037] Step 3: Divide scale inhibitor dispersant I into two equal parts, add 5g of polyethylene glycol ether to one of them, and continue stirring for 30 minutes to obtain scale inhibitor dispersant II.

Embodiment 2

[0039] Step 1. Dissolve 100g of maleic anhydride in 200g of water, stir and heat, and gradually add 12g of initiator ferrous ammonium sulfate at the same time, control the reaction temperature at 120°C, and carry out polymerization reaction for 5 hours;

[0040] Step 2. Cool down the system. When the temperature drops to 80°C, gradually add 50g of ethylenediaminetetramethylenephosphonic acid and 100g of water into the solution, and stir for 30 minutes to obtain scale inhibitor dispersant I;

[0041] Step 3: Divide scale inhibitor dispersant I into two equal parts, add 5g of polyethylene glycol ether to one of them, and continue stirring for 30 minutes to obtain scale inhibitor dispersant II.

Embodiment 3

[0043] Step 1. Dissolve 50g of acrylic acid and 50g of 2-acrylamide-2-methylpropanesulfonic acid in 200g of water, stir and heat, and at the same time gradually add 10g of initiator ammonium persulfate, control the reaction temperature at 70°C, and carry out polymerization reaction , reacted for 6 hours;

[0044] Step 2. Cool down the system. When the temperature drops to 40°C, gradually add 100g of 1-hydroxyethyl-1,1-diphosphonic acid and 200g of water into the solution, and stir for 30 minutes to obtain scale inhibitor dispersant I;

[0045] Step 3: Divide scale inhibitor dispersant I into two equal parts, add 10 g of polyethylene glycol ether to one of them, and continue stirring for 30 minutes to obtain scale inhibitor dispersant II.

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Abstract

The invention provides a combined scale inhibition dispersant for a coal gasification system and an application method thereof, which belong to the technical filed of water processing. The combined scale inhibition and dispersing agent takes organic polybasic phosphonic acid and carboxylic acid substances as a base, the carboxylic acid raw material is subjected to copolymerization or homopolymerization, and a polycarboxylic acid copolymer is formed, the polymer is further mixed with an organic polyphosphonic acid to form a scale inhibition dispersant I, and the scale inhibition dispersant I isfurther compounded with a polyether material to form a scale inhibition dispersant II. In the application method, the scale inhibition dispersant I is added in a non-gas washing zone of a coal gasification water circulation system, and the scale inhibition dispersant II is added in a gas washing zone. The combined scale inhibition dispersant of the invention has good chemical stability and is noteasy to be hydrolyzed and degraded, according to the application process with the segmented addition, the combined scale inhibition dispersant does not deactivate under higher temperature and pressure, but plays a coordinated role, has a small amount of use, and can be widely applied to industrial water treatment such as coal gasification.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a combined antiscaling and dispersing agent for water treatment of a coal gasification system and an application method thereof. Background technique [0002] An important task in industrial water treatment is to prevent scaling in water bodies. Scaling control is to control calcium carbonate scale, barium sulfate scale, strontium sulfate scale, iron oxide scale, and various colloidal particles and insoluble impurities produced during the operation of industrial water. (fine sediment), etc. caused by deposition and scaling. [0003] Although the commonly used scale inhibitors and dispersants on the market have played a certain role in preventing industrial water from scaling, there are still many defects and deficiencies, such as low tolerance to calcium ions, iron ions and silicate ions in water. Especially in the coal gasification industry, because the water quality ...

Claims

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Application Information

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IPC IPC(8): C02F5/14
CPCC02F5/14
Inventor 姚敏匡建平马乐波刘水刚罗春桃张镓铄郭中山李刚健乃国星金政伟黄斌杨建荣夏支文白云波陈毅烈赵建宁赵立军赵元琪周峰
Owner 宁夏神耀科技有限责任公司
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