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Preparation method of corrosion-inhibiting agent made of phosphorus-molybdenum polymer

A corrosion and scale inhibitor, polymer technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve high treatment costs, porous film formation, poor metal adhesion and other issues to achieve the effect of reducing processing costs, improving processing effects, and reducing processing costs

Inactive Publication Date: 2015-07-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] From an economic point of view, the previous corrosion and scale inhibitors were mainly based on phosphorus-based formulations. The biggest advantage of this technology is that the treatment cost is low, but its film formation is porous and its adhesion to metal is relatively poor; and the secondary Pollution is becoming more and more prominent
[0004] From the perspective of protecting the environment, in order to avoid secondary pollution, some molybdenum-based formulas have emerged as the times require, but these formulas have the advantages of dense film formation and firm bonding with metal surfaces, but their treatment costs are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Industrial preparation of phosphorus molybdenum polymer corrosion and scale inhibitor

[0019] Pour 100kg of sodium hexametaphosphate, 300kg of polymaleic anhydride, and 200kg of sodium molybdate into the reaction kettle for mixing, and use mechanical stirring for 30 minutes to make it evenly mixed. The reaction kettle was sealed and heated, and the temperature of the thermostat was set to 970°C. After the reaction kettle reached the preset temperature, it was reacted for another 1 hour, and at this time, the mixture formed a copolymer in a molten state. Afterwards, the reactor was opened, and the temperature was naturally lowered to 250° C. in the air. Add tap water with 3 times the volume of the copolymer into the reaction kettle, and use mechanical stirring to make it into a liquid phosphorus-molybdenum polymer corrosion and scale inhibitor solution.

Embodiment 2

[0020] Example 2: Preparation of Phosphorus Molybdenum Polymer Corrosion and Scale Inhibitor in Laboratory

[0021] 100 g of sodium hexametaphosphate, 300 g of polymaleic anhydride, and 200 g of sodium molybdate were put into a crucible, and stirred for 10 minutes using a glass rod. After it is mixed evenly, put it into the muffle furnace, set the temperature control temperature to 970°C, and the heating time to 1h. After the heating is completed, the temperature is naturally lowered to 250°C. Take 1L of distilled water and put it into a suitable container, slowly pour the copolymer in the molten state into the water under the condition of stirring, so as to form a liquid phosphorus-molybdenum polymer corrosion and scale inhibitor solution.

Embodiment 3

[0022] Example 3: Industrial preparation of phosphorus molybdenum polymer corrosion and scale inhibitor

[0023] Pour 120kg of sodium hexametaphosphate, 360kg of polymaleic anhydride, and 240kg of sodium molybdate into the reaction kettle for mixing, and use mechanical stirring for 30 minutes to make it evenly mixed. The reaction kettle was sealed and then heated. The temperature of the thermostat was set at 980° C., and the reaction time was 1 hour. After the heating was completed, the reaction kettle was opened, and the temperature was naturally lowered to 280° C. in the air. Then slowly pour the copolymer in the molten state in the reactor into a 1.2m 3 Tap water, cast iron chemical pool with mechanical agitation. Through mechanical stirring, it forms a liquid phosphorus-molybdenum polymer corrosion and scale inhibitor solution.

[0024] The phosphorus-molybdenum polymer corrosion and scale inhibitor liquid prepared by this preparation method has been applied in the follo...

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Abstract

The invention discloses a preparation method of a corrosion-inhibiting agent made of phosphorus-molybdenum polymer. The preparation method comprises the following steps of: (1) mixing sodium hexametaphosphate, polymaleic anhydride and sodium molybdate according to the proportion of 1:3:2, and adopting mechanical stirring for 10-30 minutes so as to mix the materials uniformly; (2) controlling the polymerization temperature to reach 970-1000 DEG C and forming copolymer in a molten state; (3) naturally cooling the copolymer, cooling the temperature to 200-280 DEG C, and then dissolving in water to form a liquid phosphorus-molybdenum polymer; and (4) adding mercaptobenzothiazole or polyacrylic acid to prepare into the corrosion-inhibiting agent made of the phosphorus-molybdenum polymer. The preparation method disclosed by the invention has the advantages that a water treating agent produced by using the preparation method is adopted to produce the corrosion-inhibiting agent made of the phosphorus-molybdenum polymer by a high-temperature polymerization method, and after a trace amount of organic carboxyl compound is added, the chemical and physical method is applied to synthesize a series of water treating agents which are high in efficiency, have no toxicity and no eutrophic action and are suitable for multiple water environments.

Description

technical field [0001] The invention relates to the proportion and production process of a water treatment agent. The corrosion and scale inhibitor produced by this technology can make the corrosion reduction and scaling prevention treatment of industrial circulating water meet the "Design Specifications for Industrial Circulating Cooling Water Treatment" (GB50050 -2007) requirements. Background technique [0002] During the operation of the circulating water cooling system, problems such as corrosion of heat exchange equipment and scaling on the surface often occur. These problems not only affect heat transfer, but also affect the service life and safe operation of equipment. For this reason, the research and development of corrosion and scale inhibitors is particularly important for the treatment of circulating water systems. [0003] From an economic point of view, the previous corrosion and scale inhibitors were mainly based on phosphorus-based formulations. The bigges...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14
Inventor 孙宝盛齐庚申刘然王永亮刘欣
Owner TIANJIN UNIV