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Polyitaconic acid and preparation method thereof

A technology of polyitaconic acid and itaconic acid, applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc. Less, no three wastes discharge, high conversion rate

Active Publication Date: 2011-06-29
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few patent reports on the application of polyitaconic acid as a scale inhibitor in the field of industrial water treatment, and there are no literature reports on the use of polyitaconic acid as a scale inhibitor in the field of seawater utilization

Method used

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  • Polyitaconic acid and preparation method thereof
  • Polyitaconic acid and preparation method thereof
  • Polyitaconic acid and preparation method thereof

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preparation example Construction

[0025] Specifically, the preparation method of the polyitaconic acid of the present invention is characterized in that the following steps are adopted: 60% to 150% of water (based on the quality of itaconic acid), preferably 60% to 100%, is added to the reaction In the device, heat to a certain temperature (between 60°C and 120°C), and slowly add partly neutralized itaconic acid monomer solution and initiator solution to the reaction device; or, slowly add the initiator solution dropwise to Polymerization was carried out in a partially neutralized itaconic acid monomer solution. Based on the amount of the carboxyl group in the itaconic acid, the degree of neutralization of the carboxyl group in the itaconic acid monomer is 25% to 100%. Wherein, based on the amount of the carboxyl group in itaconic acid, when itaconic acid is partially neutralized, the amount of alkali added is 25% to 100% of the carboxyl group, and the degree of neutralization of the itaconic acid monomer is 2...

Embodiment 1

[0044] Add 30 g of water into a four-necked reaction flask equipped with a thermometer, two dropping funnels, a reflux condenser and a stirrer, and heat the flask to 70°C. To prepare a partially neutralized itaconic acid monomer solution, weigh 45.5 g of itaconic acid monomer, dissolve it in 30 g of water, and slowly add a certain mass (as shown in Table 1) of a 50% sodium hydroxide solution dropwise. An initiator solution was prepared containing 2.5 g ammonium persulfate and 10 g deionized water. Simultaneously, the monomer and the initiator solution were slowly added dropwise, and the dropwise addition was completed in 1 hour. At the same time, the temperature of the reaction flask was kept at 70°C. After the dropwise addition was completed, the reaction was incubated for 0.5h. Cool to room temperature and discharge to obtain polyitaconic acid. The appearance of the product is light yellow or dark red solution.

[0045] Table 1: The effect of the amount of sodium hydroxid...

Embodiment 2

[0050] Add 30 g of water into a four-necked reaction flask equipped with a thermometer, two dropping funnels, a reflux condenser and a stirrer, and heat the flask to 80°C. To prepare a partially neutralized itaconic acid monomer solution, weigh 45.5 g of itaconic acid monomer, dissolve it in 30 g of water, then slowly add 42.0 g of 50% sodium hydroxide solution dropwise, and the degree of neutralization is 75%. Then prepare an initiator solution containing a certain amount of ammonium persulfate and 10 g of deionized water, and the amount of the initiator added is shown in Table 2. Simultaneously, the monomer and the initiator solution were slowly added dropwise, and the dropwise addition was completed in 1 hour. At the same time, the temperature of the reaction flask was kept at 80°C. After the dropwise addition was completed, the reaction was incubated for 0.5h. Cool to room temperature and discharge to obtain polyitaconic acid. The appearance of the product is light yello...

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Abstract

The invention relates to polyitaconic acid and a preparation method thereof, in particular to the polyitaconic acid and a method for preparing the polyitaconic acid quickly and effectively. The polyitaconic acid comprises an itaconic acid monocarboxylate monomer unit and an itaconic acid dicarboxylate monomer unit, the molecular weight range of the polyitaconic acid, which is determined by a gel permeation chromatograph through standard polyethylene oxide (PEO) is 1000-10000, and a polymer is light yellow or dark red liquid which belongs to an environment-friendly product. The polyitaconic acid takes itaconic acid monomers which are partially neutralized as raw materials and is polymerized in water phase through the radical polymerization method. The method has simple process, few residues of the monomers, high conversion rate, high polymerization time, low energy consumption, and no emission of three wastes. The polyitaconic acid salt has a high-efficient inhibition role for formation and adhesion of calcium carbonate scale in seawater. The polyitaconic acid can be used as a scale inhibitor, a dispersing agent and a corrosion inhibitor in a seawater utilization (seawater circulating cooling, seawater desalting and the like) system, as well as a detergent additive, a chelating agent and the like.

Description

technical field [0001] The invention relates to a green scale inhibitor suitable for seawater and a preparation method thereof, in particular to a polyitaconic acid and a preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection and the increasing shortage of water resources, it is imminent to improve the recycling rate of industrial cooling water. Many water systems will operate under high hardness and high alkali water quality conditions. With the introduction of green chemistry, it has become an important research direction to develop, design and synthesize non-toxic, non-polluting and easily degradable water treatment agents. [0003] Itaconic acid is produced by bio-fermentation and has strong biodegradability. Unlike other dicarboxylic acids that rely on the separation of petrochemical products, itaconic acid continues to show its superiority among similar products in today's increasingly serious en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/02C02F5/10
Inventor 吴东霞侯纯扬武杰尹建华吴芸芳徐旭徐娜成国辰
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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