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Phosphorus-free scale and corrosion inhibitor for heat supply network and preparation method and application of phosphorus-free scale and corrosion inhibitor

A non-phosphorus scale and corrosion inhibitor technology, applied in scale removal and water softening, chemical instruments and methods, complex/solubilizer treatment, etc., can solve secondary pollution of water bodies, easily generate phosphoric acid scale, and easily decompose and other problems, to achieve the effect of improving scale inhibition performance, inhibiting metal corrosion, and strong chemical and thermal stability

Pending Publication Date: 2022-08-05
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a non-phosphorous scale and corrosion inhibitor for heating network and its preparation method and application, to solve the problem that the existing heating network scale and corrosion inhibitor contains high phosphorus, It is easy to decompose at high temperature, easy to generate phosphoric acid scale, and easy to cause secondary pollution to water bodies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a phosphorus-free scale and corrosion inhibitor for a heat net, comprising the following steps:

[0029] Step 1: Based on mass percentage, mix 15% of gluconic acid, epoxysuccinic acid and citric acid mixture, 20% of sodium lignosulfonate and 6% of hydrolyzed polymaleic anhydride with a molecular weight of 500 and heat to 60°C , the stirring speed is 80 r / min, the stirring time is 15 min, and the mixture is allowed to stand for 10 min to obtain a mixed solution.

[0030] Step 2: Add 5% triethanolamine and methyl tertiary amine mixture and 2.0% surfactant polyoxyethylene ether to the mixed solution, stir for 10 min, add 1.0% potassium molybdate and 51% deionized water, and then add After stirring for 0.5h and cooling down to room temperature, a phosphorus-free scale and corrosion inhibitor for a heat grid is obtained.

Embodiment 2

[0032] A preparation method of a phosphorus-free scale and corrosion inhibitor for a heat net, comprising the following steps:

[0033] Step 1: By mass percentage, mix 10% of lauric acid polymer, epoxysuccinic acid and citric acid mixture, 25% of ammonium lignosulfonate and 8% of hydrolyzed polymaleic anhydride with a molecular weight of 400 and then heat to 40° C., the stirring speed is 100 r / min, the stirring time is 20 min, and the mixture is allowed to stand for 15 min to obtain a mixed solution.

[0034] Step 2: Add 8% triethanolamine and methoxypropylamine mixture and 3.0% surfactant dodecanoic fatty alcohol polyoxyethylene ether to the mixed solution, stir for 10min, add 2.0% potassium molybdate and 44% Ionized water was stirred for 0.5 h and then cooled to room temperature to obtain a phosphorus-free scale and corrosion inhibitor for heat grids.

Embodiment 3

[0036] A preparation method of a phosphorus-free scale and corrosion inhibitor for a heat net, comprising the following steps:

[0037] Step 1: By mass percentage, after mixing 5% of dialkyl fatty acid carboxylic acid, decanoic acid and epoxysuccinic acid mixture, 30% of sodium lignosulfonate and 10% of hydrolyzed polymaleic anhydride with a molecular weight of 300 The mixture was heated to 65° C., the stirring speed was 120 r / min, the stirring time was 20 min, and the mixture was allowed to stand for 20 min to obtain a mixed solution.

[0038] Step 2: Add 10% aminoamide and ethylenetetramine mixture and 4.0% surfactant polyoxyethylene ether to the mixed solution, stir for 10min, add 1.0% potassium molybdate and 50% deionized water, and then add After stirring for 1.0 h and cooling to room temperature, a phosphorus-free scale and corrosion inhibitor for a heat grid is obtained.

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Abstract

The invention discloses a phosphorus-free scale and corrosion inhibitor for a heat supply network and a preparation method and application of the phosphorus-free scale and corrosion inhibitor, and belongs to the technical field of heat supply network water system water treatment agents.The phosphorus-free scale and corrosion inhibitor comprises, by mass, 5.0%-30.0% of lignin derivatives and the balance unitary or polybasic organic carboxylic acid mixture containing 2%-14% of carbon atoms. 5.0 to 10.0 percent of hydrolytic polymaleic anhydride; 2.0 to 10.0% of an organic amine mixture; 1.0 to 5.0 percent of a surfactant; 0.5 to 2.0 percent of molybdate; and the balance of deionized water. The sum of the proportions of all the components is 100%. The problems that an existing heat supply network agent of a heat supply network system is high in phosphorus content and not high in scale and corrosion inhibition performance are mainly solved, the product is environmentally friendly, scaling and corrosion phenomena in the heat supply network system can be effectively prevented, a good corrosion inhibition effect is achieved, and efficient and safe operation of the heat supply network system is ensured.

Description

technical field [0001] The invention belongs to the technical field of water treatment chemicals for a heating pipe network water system, and in particular relates to a phosphorus-free scale and corrosion inhibitor for a heating network and a preparation method and application thereof. Background technique [0002] At present, the corrosion and scaling of heat exchangers in the heating and heating network system and the corrosion of the heating pipe network have become increasingly prominent, and even affect the heating of people's livelihood and the quality of soda water of the unit. Due to process and control problems, many heaters in the heating network system have leaked, which seriously affects the safe and economic operation of the unit. In particular, the heater is out of operation due to the leakage and scaling of the heater, which affects urban heating in winter and leads to other unsafe factors. . The existing heat network scale and corrosion inhibitor has high ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F5/10C02F5/08
CPCC02F5/125C02F5/105
Inventor 李新军郭焱黄万启张洪博郝洪铎肖海刚
Owner XIAN THERMAL POWER RES INST CO LTD