Method for synthesizing green scale inhibitor poly-asparagic acid through microwaves

A technology of polyaspartic acid and scale inhibitor, which is used in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., which can solve the problem of process conditions. There are few studies and no literature reports. , The influence of the final product polyaspartic acid yield and scale inhibition rate is also less studied, so as to achieve the effects of shortened reaction time, high tolerance and simple process

Inactive Publication Date: 2009-11-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

At present, there are few patent reports on the microwave synthesis technology of the green antiscalant polyaspartic acid, and the research on polyaspartic acid is mainly concentrated on the synthesis process of the intermediate polysuccinimide. For polys

Method used

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Experimental program
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Effect test

Embodiment 1

[0018] Add 9.8g of maleic anhydride in the three-necked flask, place it under the microwave field of 2450MHz, the microwave power is 1000W, and slowly add the ammonia water with a concentration of 25% to 28% at a certain speed, the mole of maleic anhydride and ammonia water The ratio is 1:2.3, the time of microwave radiation is 15min, and the reaction temperature is 80°C to obtain a glassy, ​​transparent polysuccinamide aqueous solution, and then the polysuccinamide is placed in a constant temperature drying oven for dehydration and cyclization to obtain a brown fluffy solid poly Succinimide, the temperature is controlled at 200 °C; finally, polysuccinimide is added to 50mL NaOH aqueous solution for microwave hydrolysis, the microwave hydrolysis power is 500W, the radiation time is 5min, the temperature is shown in Table 1, the concentration of NaOH aqueous solution is 2mol / L, and the obtained Brown-red viscous polyaspartic acid solution, adjust the pH of the solution to be neu...

Embodiment 2

[0022] Add 9.8g of maleic anhydride in the three-necked flask, place it under the microwave field of 2450MHz, the microwave power is 900W, slowly add ammonia water with a concentration of 25% to 28% at a certain speed, the molar ratio of maleic anhydride to ammonia water The ratio is 1:2.3, the time of microwave radiation is 20min, and the reaction temperature is 90°C to obtain a glassy, ​​transparent polysuccinamide aqueous solution, and then the polysuccinamide is placed in a constant temperature drying oven for dehydration and cyclization to obtain a brownish-yellow fluffy solid polysuccinyl imide, the temperature was controlled at 200°C; finally, polysuccinimide was added to 50mL NaOH aqueous solution for microwave hydrolysis. To obtain a brown-red viscous polyaspartic acid solution, adjust the pH of the solution to be neutral, filter, add the product filtrate to absolute ethanol, collect the precipitate, and dehydrate and dry at 200°C to obtain the product of polyaspartic ...

Embodiment 3

[0026] Add 9.8g of maleic anhydride in the three-necked flask, place it under the microwave field of 2450MHz, the microwave power is 900W, slowly add ammonia water with a concentration of 25% to 28% at a certain speed, the molar ratio of maleic anhydride to ammonia water 1:2.3, the time of microwave radiation is 20min, and the reaction temperature is 85°C to obtain a glassy, ​​transparent polysuccinamide aqueous solution, and then place the polysuccinamide in a constant temperature drying oven for dehydration and cyclization to obtain a brown fluffy solid polysuccinyl imide, the temperature was controlled at 200°C; finally, polysuccinimide was added to 50mL NaOH aqueous solution for microwave hydrolysis, the power of microwave hydrolysis was shown in Table 3, the microwave irradiation time was 5min, the temperature was 50°C, and the concentration of NaOH aqueous solution was 2mol / L , to obtain a brown-red viscous polyaspartic acid solution, adjust the pH of the solution to be n...

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Abstract

The invention discloses a method for synthesizing a green scale inhibitor asparagic acid through microwaves, which comprises the following steps: using maleic anhydride and ammonia water as raw materials; synthesizing an intermediate poly-succinimide through the microwaves; and then adding an inorganic base to perform hydrolyzation under a condition of microwave radiation so as to generate the poly-asparagic acid. The molecular weight distribution of the poly-asparagic acid prepared by the method is between 2,500 and 5,000, and the poly-asparagic acid has the performances of scale inhibition, corrosion inhibition and biodegradability, belongs to environment-friendly chemical products and has wide applications. The method has the advantages of simple process, high synthesis rate, low energy consumption, less pollution, high yield and stable product nature.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and water treatment, and specifically relates to a method for preparing a green antiscalant polyaspartic acid by using maleic anhydride as a raw material and applying microwave chemical technology. The antiscalant is a phosphorus-free The low-molecular-weight homopolymer is an environmentally friendly green scale inhibitor, which is used for scale inhibition treatment of water quality. Background technique [0002] In various fields involving water treatment, fouling will bring serious consequences to production, reduce production capacity, and even cause shutdown, which will bring great losses to industrial production. Therefore, the scale inhibition treatment of industrial water has always been a research topic that people pay attention to, and the scale inhibition treatment by adding scale inhibitors is a relatively convenient and efficient method among many scale inhibition methods. ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C02F5/12
Inventor 董社英钮丽黄廷林周元瑧王磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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