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Preparation method of modified polyaspartic acid scale inhibitor

A technology of polyaspartic acid and aspartic acid, which is applied in chemical instruments and methods, descaling and water softening, special treatment targets, etc., can solve the problem of low scale inhibition efficiency, high use cost and production cost of scale inhibitors. Low-level problems, to achieve the effect of improving scale inhibition efficiency, easy operation, and improving efficiency

Inactive Publication Date: 2015-04-29
程池
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a preparation method of a modified polyaspartic acid scale inhibitor, which has high scale inhibition efficiency, and can produce Low cost, biodegradable and other characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation method of modified polyaspartic acid scale inhibitor is as follows:

[0017] (1) Preparation of polysuccinimide

[0018] According to the mass ratio of L-aspartic acid:phosphoric acid of 3:1, the polymerization reaction was carried out at 200° C. for 3 hours to obtain polysuccinimide.

[0019] (2) Preparation of polyaspartic acid and modified polyaspartic acid products

[0020] After the first step (1) is completed, take 1 / 2 (mass) of the polysuccinimide obtained in the first step (1), add it to the NaOH solution with a mass percentage of 10%, adjust the pH value to 13, at 40 ° C Hydrolyze for 1 hour, adjust the pH value to 7 with dilute hydrochloric acid, and obtain the polyaspartic acid solution. Take the remaining 1 / 2 (mass) of the polysuccinimide obtained in step (1), add 10mL of deionized water, and heat at a temperature of 70°C to obtain a suspension; add 0.18g of melamine to the suspension to copolymerize React for 1.5h; wash with water t...

Embodiment 2

[0022] A kind of preparation method of modified polyaspartic acid scale inhibitor, with embodiment 1, wherein:

[0023] In step (1), the mass ratio of L-aspartic acid:phosphoric acid is 2:1, the temperature is 190° C., and the polymerization reaction time is 2 hours.

[0024] In the 2nd (2) step, the NaOH solution mass percentage concentration is 9%, adjusts the pH value to be 11, hydrolyzes 0.5h under the condition of 30 ℃, prepares the polyaspartic acid solution; The copolymerization reaction time 1h, the NaOH solution mass percentage concentration is 9%, adjust the pH value to 11, and hydrolyze at 30°C for 0.5h to prepare the modified polyaspartic acid scale inhibitor.

Embodiment 3

[0026] A kind of preparation method of modified polyaspartic acid scale inhibitor, with embodiment 1, 2, wherein:

[0027] In step (1), the mass ratio of L-aspartic acid:phosphoric acid is 4:1, the temperature is 220° C., and the polymerization reaction time is 4 hours.

[0028] In the 2nd step, the mass percent concentration of NaOH solution is 11%, adjust the pH value to be 12, hydrolyze 2h under the condition of 50 ℃, prepare polyaspartic acid solution; Copolymerization reaction time 2h, the mass percent concentration of NaOH solution is 11 %, adjust the pH value to 12, hydrolyze at 50°C for 2 hours, and prepare the modified polyaspartic acid scale inhibitor.

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Abstract

The invention provides a preparation method of a modified polyaspartic acid scale inhibitor and belongs to the technical field of water treatment of macromolecule materials. The preparation method of the modified polyaspartic acid scale inhibitor comprises the following two steps: firstly carrying out pyrocondensation polymerization reaction to obtain polysuccinimide in presence of a catalyst while L-aspartic acid is taken as a raw material; and secondly carrying out copolymerization on tripolycyanamide and polysuccinimide for 1-2 hours, and then washing and hydrolyzing, so that the modified polyaspartic acid scale inhibitor is obtained. The preparation method of the modified polyaspartic acid scale inhibitor can be used for obviously improving scale inhibition efficiency of polyaspartic acid and has the advantages of simple technique, easy operation, low environmental pollution, low production cost and the like.

Description

Technical field: [0001] The invention relates to a synthesis method of a modified polyaspartic acid scale inhibitor, in particular to a preparation method of a modified polyaspartic acid scale inhibitor in a water treatment agent. Background technique: [0002] With the rapid development of industrial production, industrial water equipment is increasing day by day, and industrial water consumption is also increasing day by day. During the operation of industrial water equipment, scale salts, such as CaCO 3 , Ca 3 (PO 4 ) 2 , CaSO 4 and BaSO 4 etc. Settling on the surface of the equipment reduces the efficiency of the equipment and affects the normal operation of the industrial device. In order to inhibit scaling, water treatment scale inhibitors are generally used in industry, including polyphosphate, polycarboxylic acid, etc. However, these scale inhibitors contain phosphorus, which will lead to eutrophication of water, and are difficult to biodegrade, causing enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
CPCC02F5/125C02F2101/10C02F2103/02C02F2303/22
Inventor 程池裴疆森姚粟刘勇王哲
Owner 程池
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