A high temperature resistant modified polyaspartic acid scale inhibitor and its preparation method and use method

A polyaspartic acid, high temperature resistant technology, used in descaling and water softening, chemical instruments and methods, geothermal power generation, etc., can solve problems such as poor thermal stability, and achieve stable structure, mild synthesis conditions, and reaction. The effect of easy availability of raw materials

Active Publication Date: 2022-05-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the defective problem of poor thermal stability of existing polyaspartic acid scale inhibitors, the object of the present invention is to provide a high temperature resistant modified polyaspartic acid scale inhibitor and its preparation method and use method

Method used

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  • A high temperature resistant modified polyaspartic acid scale inhibitor and its preparation method and use method
  • A high temperature resistant modified polyaspartic acid scale inhibitor and its preparation method and use method
  • A high temperature resistant modified polyaspartic acid scale inhibitor and its preparation method and use method

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preparation example Construction

[0046] The method for preparing a high-temperature-resistant polyaspartic acid scale inhibitor by modifying and modifying a nitrogen-containing heterocyclic small molecule disclosed in the present invention comprises the following steps:

[0047] (A) Preparation of polysuccinimide (PSI) by maleic anhydride method

[0048] Add 20-30g of maleic anhydride solid and 20-30ml of deionized water into a 500ml three-necked flask with a condensing device, then stir magnetically, control the temperature of the oil bath at 80±5°C, and heat for 60-90min to completely dissolve the maleic anhydride .

[0049] Control the molar ratio of maleic anhydride and urea to be 1:0.5~1:0.7, add urea powder evenly to the homogeneous maleic anhydride solution obtained above, control the oil bath temperature to 80±5°C, and heat for 60~90min , so that maleic anhydride and ammonia donor urea fully generate ammonium hydrogen maleate through the ring-opening reaction.

[0050] Put cold water at 5°C into the...

Embodiment 1

[0057] Embodiment 1 (proline amide modified polyaspartic acid)

[0058] Step 1: Add 20g of maleic anhydride and 20ml of distilled water into a 250ml three-necked round-bottomed flask with a condensing device, and stir magnetically in an oil bath at 80°C for 1 hour to dissolve. Slowly add 9 g of urea powder into the solution, and stir magnetically for 1 h until the mixture is uniform. After the experiment started, turn on the condensed water at 5°C, raise the temperature of the oil bath to 160°C, add 2ml of sulfuric acid and phosphoric acid mixed acid with a volume ratio of 1:1, continue to heat up to 180°C, and continue to react for 3 hours, forming on the inner wall of the beaker Orange-red polysuccinimide solid (PSI).

[0059] Step 2: Take out and dry the orange-red polysuccinimide solid obtained in Step 1, add 20ml of N-N-dimethylformamide to dissolve into an orange-red solution, filter, and collect the filtrate with a sufficient amount of absolute ethanol. The pink flocc...

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Abstract

The invention discloses a high-temperature-resistant modified polyaspartic acid scale inhibitor and its preparation method and application method, belonging to the technical field of chemical synthesis. The invention uses maleic anhydride and urea as raw materials and reacts them in a mixed acid solution. Polysuccinimide is obtained; polysuccinimide and prolinamide are subjected to ring-opening grafting reaction to obtain a high-temperature-resistant modified polyaspartic acid scale inhibitor. The nitrogen-containing heterocyclic small-molecule modified polyaspartic acid prepared by the present invention belongs to the non-phosphorus environment-friendly scale inhibitor, overcomes the disadvantage of poor scale inhibition effect of the existing polyaspartic acid at high temperature, and is suitable for calcium carbonate type The scaling system has excellent scale-inhibiting properties and is suitable for water circulation systems with local high temperatures such as urban geothermal heating systems and oil well production.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and relates to a high-temperature-resistant polyaspartic acid scale inhibitor, a preparation method and a use method thereof. Background technique [0002] A large number of anions and cations are often dissolved in industrial water systems. When changes in pressure, temperature, and concentration occur during the water use process, the concentration of inorganic salt ions in the system will be supersaturated, and then precipitated to form scale. Heat transfer efficiency brings safety hazards and economic losses to industrial production. Many industrial processes, such as geothermal resources application, reverse osmosis, multi-stage flash evaporation, multi-effect distillation, etc., are designed to scale in industrial water circulation cooling occasions, and the scale types mainly include calcium carbonate, calcium sulfate, calcium phosphate, and barium sulfate. , iron oxide, etc., ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C02F5/12
CPCC08G73/1092C02F5/12Y02E10/10
Inventor 齐随涛晏嘉伟
Owner XI AN JIAOTONG UNIV
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