Phosphorus-free scale and corrosion inhibitor containing fulvic acid and preparation method thereof

Abstract

The invention provides a non-phosphorus scale and corrosion inhibitor containing fulvic acid. The non-phosphorus scale and corrosion inhibitor containing fulvic acid is composed of a scale inhibition component, a corrosion inhibition component and deionized water. The scale inhibition component is composed of fulvic acid, a maleic acid-acrylic acid biopolymer and polyaspartic acid. The corrosion inhibition component is composed of zinc sulfate and polyoxyethylene naphthenic acid imidazoline. A preparation method of the non-phosphorus scale and corrosion inhibitor comprises the following steps: adding zinc sulfate into deionized water to obtain a mixture A; adding fulvic acid into the mixture A to obtain a mixture B; successively adding the maleic acid-acrylic acid biopolymer and polyaspartic acid into the mixture B to obtain a mixture C; and finally adding polyoxyethylene naphthenic acid imidazoline into the mixture C to obtain the non-phosphorus scale and corrosion inhibitor. The corrosion inhibitor is phosphorus-free, contains fulvic acid, has good corrosion inhibition property and scale inhibition property and is especially suitable for high-hardness and high-alkalinity water in North China.

Description

technical field [0001] The invention belongs to a corrosion inhibitor used for treating circulating cooling water, and specifically relates to a fulvic acid-free [0002] Phosphorus scale and corrosion inhibitor and preparation method thereof. Background technique [0003] The rapid increase of population and the rapid development of industry have led to an increasing shortage of water resources, especially in Northwest China. Therefore, water conservation has become an important way to develop water resources and has attracted widespread attention. Among them, circulating cooling water accounts for 90% of the total industrial water consumption. Above, reduce the blowdown of the circulating water system, and treat the circulating water to increase the concentration ratio of the circulating water, so that the reuse rate of the water can reach more than 96%. Domestic research on water treatment agents is mostly organic phosphonic acid scale inhibitors and copolymer scale inhi...

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Problems solved by technology

Domestic research on water treatment agents is mostly organic phosphonic acid scale inhibitors and copolymer scale inhibitors and dispersants, which have stable chemical properties and can withstand higher temperatures and pH. They are currently the most used water treatment agents, such as ATMP , HEDP, etc., but organophosphoric acid cannot effectively inhibit the precipitation of calcium phosphate scale, zinc scale and iron oxide, and organic phosphonic acid scale inhibitors will decompose into orthophosphate after a long time, leading to eutrophication of environmental waters and promoting the growth of bacteria and algae growth and form red tides, causing water pollution. In addition, most of the existing scale and corrosion inhibitors have a scale inhibition rate of about 95% and a corrosion inhibition rate of about 93%. The scale and corrosion inhibition rates are relatively low, so phosphorus-containing inhibitors The use of scale agents has been limited, and the development of low-phosphorus or phosphorus-free green scale inhibitors has become the main direction of water treatment agents today. Copolymer scale inhibitors (including binary, ternary, and multi-component copolymers) mainly include acrylic acid, Maleic anhydride, etc., have good scale inhibition performance, but the disadvantage is that they cannot be biodegraded

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