Aspartic acid-lysine copolymer and synthetic method thereof

A technology of lysine copolymer and aspartic acid, applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc., can solve unstable product performance, slow reaction speed, production Low yield and other problems, to achieve the effect of stable product performance, fast reaction speed and high yield

Active Publication Date: 2015-03-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can improve the effect of polyaspartic acid on CaCO 3 Excellent scale inhibition effect, which solves the defects of slow reaction speed, low yield and unstable product performance in the existing synthetic methods

Method used

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  • Aspartic acid-lysine copolymer and synthetic method thereof
  • Aspartic acid-lysine copolymer and synthetic method thereof
  • Aspartic acid-lysine copolymer and synthetic method thereof

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specific Embodiment approach 1

[0009] Specific embodiment one: the structural formula of the aspartic acid-lysine copolymer of the present embodiment is The range of x / (x+y) is 0.1-1, and the range of x+y is 3-100. The optimum range of x / (x+y) in this embodiment is 0.3-0.7, and the optimum range of x+y is 6-80.

specific Embodiment approach 2

[0010] Specific embodiment two: this embodiment synthesizes aspartic acid-lysine copolymer according to the following steps:

[0011] Using aspartic acid and lysine as raw materials, using microwave technology, under the condition of microwave frequency of 915±50MHz or 2450±50MHz and microwave power of 400-10000W, a small amount of catalyst and organic solvent are added to the reactant, The intermediate of aspartic acid-lysine copolymer can be obtained by radiation reaction for 1 to 30 minutes. After the intermediate is washed and separated by catalyst, it can be hydrolyzed under alkaline conditions to obtain aspartic acid-lysine copolymer. (or polyaspartic acid derivatives).

[0012] In the synthesis process, the reaction time will be shortened with the increase of microwave power. Too short reaction time is not conducive to uniform reaction, so a stirring device is added, and the reaction time is not less than 4min; too high power will lead to dark color of the reaction prod...

specific Embodiment approach 4

[0017] Specific embodiment four: aspartic acid and lysine respectively get 0.10mol, add three-neck round-bottomed flask; According to the kind of catalyst selected in Table 2, the ratio of catalyst and raw material stoichiometric number is 0.05; Add 16mL propylene carbonate, The reaction time was 8 minutes under microwave radiation, and the microwave power was 1200W. A series of brown and fluffy products were obtained. Add 120mL of pure water to rinse the product and separate the catalyst, add 42mL of 3mol / L NaOH to dissolve the product, adjust the pH of the solution to neutral, and filter , adding excess ethanol to the filtrate for dehydration, collecting the precipitate and vacuum drying at 70°C to obtain aspartic acid-lysine copolymer.

[0018] Table 2 The impact of the type of catalyst on the copolymer yield and scale inhibition performance

[0019]

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Abstract

The invention relates to modified polyaspartic acid and a synthetic method thereof, in particular to an aspartic acid-lysine copolymer and a synthetic method thereof and aims to solve the problems that the conventional polyaspartic acid modified product has the disadvantages of complex synthetic process, low reaction speed, unstable product performance and low CaCO3 scale inhibition rate. The structural formula of the aspartic acid-lysine copolymer is shown in the specification, and the synthetic process comprises the following steps: aspartic acid and lysine are used as the raw material, a small amount of a catalyst and an appropriate amount of an organic solvent are added under the microwave condition of 865-965 MHz or 2400-2500 MHz and 400-10000 W, and radiation is carried out for 1-30 min, so that a midbody is synthesized, the organic solvent is recovered in the form of gas, and pure water drip washing, separation of a catalyst and basic hydrolysis are sequentially performed on the midbody so as to obtain the aspartic acid-lysine copolymer. The aspartic acid-lysine copolymer and the synthetic method thereof have the advantages of simple process, high reaction speed, high yield, energy conservation, less pollution and obvious improvement of product performance.

Description

Technical field: [0001] The invention relates to an aspartic acid-lysine copolymer and a synthesis method thereof, in particular to an aspartic acid-lysine copolymer used as a water treatment agent and a synthesis method thereof. Background technique: [0002] The greening of water treatment chemicals has become the mainstream of its development. Polycarboxylic acid scale inhibitors are internationally recognized "green chemicals". Polyaspartic acid with a certain molecular weight is not only effective against calcium sulfate, barium sulfate, calcium carbonate, Calcium scaling has a good inhibitory performance, and it is effective for CO 2 Corrosion has a certain corrosion inhibition effect. The synthesis and application of polyaspartic acid has become a research hotspot in the field of water treatment chemicals in recent years. However, some studies have shown that: at higher Ca 2+ At the concentration and temperature, the scale inhibition performance of polyaspartic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08G69/10C02F5/12
Inventor 张玉玲李倩王昕赵华伟胡志光张敬红
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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