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Preparation method of polymer for auxiliary reaction in seawater desalination reaction

A polymer and reaction technology, applied in the field of polymer material preparation, can solve problems such as reactor damage, avoid environmental pollution, reduce the use of drugs, and simplify the process flow

Pending Publication Date: 2021-07-09
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the biggest problem faced in the process of front-end intervention is that the pumping of concentrated seawater into the reactor can easily cause damage to the reactor

Method used

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  • Preparation method of polymer for auxiliary reaction in seawater desalination reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of a polymer material packed column for reversible complexation of metal ions:

[0017] A. Synthesis of furfuryl alcohol resin (PFA): Add 100 g of furfuryl alcohol into a round bottom flask, add 20 ml of deionized water, heat and stir under nitrogen atmosphere, control the temperature at 60° C., and react for 30 minutes. Subsequently, 5ml of concentrated sulfuric acid was diluted to 30ml, gradually added dropwise to the flask, and the temperature was controlled at 70-80°C for 2 hours of reaction. Cool down to room temperature, add ammonia water to adjust the pH to neutral, and centrifuge the product, then dry it under vacuum overnight.

[0018] B. Synthesis of polyacrylic acid (PAA): add 1 g of acrylic acid to a round bottom flask, add 100 ml of deionized water, heat and stir under a nitrogen atmosphere, control the temperature at 75° C., and react for 30 minutes. 20 g of acrylic acid and an equivalent amount of ammonium persulfate were respectively dropped...

Embodiment 2

[0025] The influence of concentrated seawater quality on the removal rate of high-valent cations such as calcium and magnesium was further analyzed; the influence of supersaturation and pH value on the grain shape, formation speed, yield and purity of ammonium magnesium phosphate were analyzed:

[0026] A. Supersaturation: When the supersaturation of the reaction is between 1 and 5, the removal rate of phosphate and the formation of magnesium ammonium phosphate crystals can reach the best;

[0027] B. pH value: According to the experimental results and theoretical analysis, a large amount of struvite is formed between the pH value of 8.0 and 10.0, and the purity is relatively high;

[0028] C. Ratio of crystal ions: Mg 2+ , NH 4 + , PO 4 3- The stoichiometric ratio of the three reacting to form struvite is 1:1:1, NH 4 + When the remaining mass concentration is between 30 and 80 mg / L, the purity is the highest. Mg 2+ PO 4 3- When the molar ratio of substances is great...

Embodiment 3

[0032] Use the paint produced in Example 1, and use the following scheme to smear the sample plate. After grinding and degreasing the cold-rolled steel plate, spray the paint onto the sample plate at a speed of 0.3ml / s and a wet film thickness of ~75 μm in a 50-degree oven ,drying. The prepared steel plate with PAA-PFA coating and the comparative steel plate were placed in a beaker filled with 10 times the volume of concentrated seawater concentrated in seawater, and the aging test was carried out. After 30 days, it turned out that the coated steel plate had no obvious change and had better stability.

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Abstract

The invention relates to a preparation method of a polymer for auxiliary reaction in seawater desalination reaction, the polymer can be used as an auxiliary reactant and applied to a coating material and a filling material of a seawater desalination reaction kettle. The invention belongs to the technical field of seawater desalination. The method comprises the following steps: synthesis of furfuryl alcohol resin, synthesis of polyacrylic acid and synthesis of a polyacrylic acid-polyfurfuryl alcohol network structure. The method has the beneficial effects that the coating material is bonded with effective chemical functional groups to assist in treating the concentrated seawater, and soluble complexing agents such as EDTA (Ethylene Diamine Tetraacetic Acid) and citric acid in the EWT reagent are effectively replaced.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a preparation method of a polymer material, which can be used as a filling material for a reaction-packed column in a struvite extraction process flow. Background technique [0002] Magnesium ammonium phosphate, commonly known as struvite, the molecular formula is MgNH 4 PO 4 ·6H 2 O is an amorphous precipitate, only slightly soluble in water, and its nutrient release rate is slower than other soluble fertilizers, so it can be used as a slow-release fertilizer. [0003] Concentrated seawater is one of the raw materials needed to produce high-quality struvite. Using seawater desalination concentrated seawater and ammonium phosphate solution as the main raw materials, adding chemical reagents to produce magnesium ammonium phosphate slow-release fertilizer has high market prospects and economic benefits. This process requires that the brine used as raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L65/00C08L33/02C09D165/00C09D7/65C01B25/45C05G3/40C05G3/90C02F1/04C02F103/08
CPCC01B25/451C01P2002/72C01P2004/60C02F1/04C02F2103/08C05B9/00C08L65/00C08L2205/04C09D165/00C09D7/65C05G3/40C05G3/90C08L33/02Y02A20/124
Inventor 阮仕平王晓刚徐世凯杨彦于璐郭风赵金箫张睿李昂程锐王彤彤陈健王勇武秀侠丁文浩董波杨宇祝龙周杰
Owner NANJING HYDRAULIC RES INST
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