Composite scale and corrosion inhibitor and preparation method thereof

Abstract

The invention provides a phosphate-free high-biodegradability scale and corrosion inhibitor applicable to water reclamation, which mainly comprises an agent A and an agent B, wherein the agent A is prepared from the following raw materials in parts by weight: 3-6 parts of polyepoxysuccinic acid, 1.3-4.5 parts of sodium molybdate, 20-35 parts of phosphate-free antiscale dispersant, 0.5-1.5 parts of benzotriazole and 52-75.2 parts of deionized water; and the agent B is prepared from the following raw materials in parts by weight: 5-12 parts of sodium gluconate, 15-30 parts of zinc sulfate, 0.5-3 parts of concentrated sulfuric acid and 55-80 parts of deionized water. The preparation method comprises the following steps: respectively preparing the agent A and agent B, and uniformly stirring to obtain the scale and corrosion inhibitor. The experiment indicates that the composite scale and corrosion inhibitor has favorable scale inhibition property and corrosion inhibition effect for reclaimed circulating cooling water.

Description

technical field [0001] The invention belongs to the technical field of chemical products, and in particular relates to a composite scale and corrosion inhibitor and a preparation method thereof. Background technique [0002] With the rapid development of industrial production, the level of industrialization continues to increase, and industrial water consumption is increasing. In developed countries, industrial water consumption accounts for 1 / 2-3 / 4 of the total water intake. The annual industrial water consumption in my country is about 110 billion cubic meters meters, and industrial circulating cooling water accounts for more than 50% of it. Especially in the north of my country, the situation of limiting electricity by water and determining electricity by water is quite serious. The shortage of water resources has gradually become the bottleneck of power development. How to save water and improve water utilization is an urgent problem for power plants. If the reclaimed wa...

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Problems solved by technology

[0004] Since part of the reclaimed water used for circulating cooling water comes from urban domestic sewage, it is likely to contain a part of phosphorus, and phosphorus is the most fundamental factor that causes eutrophication of water bodies and may cause "red tides", so if the used Phosphorus-based substances are also contained in water treatment agents, which will inevitably aggravate the deterioration of the environment

"A scale and corrosion inhibitor suitable for reuse of reclaimed water" (Chinese Patent Publication No. CN101423300) discloses a scale and corrosion inhibitor. It can be used in water bodies with poor water quality such as urban reclaimed water, but the 2-phosphobutane 1, 2, 4-tricarboxylic acid (PBTC) in the substance used is measured by the phosphomolybdenum blue colorimetric method and the 721 spectrophotometer The content of total phosphate is about 17%; the dispersant used in "Reclaimed Water Reuse Scale and Corrosion Inhibitor and Its Preparation Method" (Chinese Patent No. CN102730846A) also contains phosphine group, if the new water treatment agent The concept re-evaluates its performance, and it must be limited in terms of reclaimed water reuse

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