Scale and corrosion inhibitor for circulating cooling water

Abstract

The invention relates to a scale and corrosion inhibitor for circulating cooling water. The inhibitor comprises components of, by weight: 15% to 30% of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) and/or 5% to 20% of 2-hydroxyl-phosphino acetic acid (HPAA); and 10% to 30% of amino trimethylene phosphonic acid (ATMP) and/or 5% to 10% of 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP) and/or 10% to 20% of polyacrylic acid (PAA) and/or 5% to 20% of polymaleic anhydride (PMA); and 1% to 2% of benzotriazole (BTA) or 1% to 2% of methylbenzotriazole (TTA); and/or 10% to 20% of phosphono-carboxylic acid copolymer (MAHS) and rest amount of deionized water. The CaCO3 inhibiting performance and corrosion inhibiting performance of the present inhibitor surpass that of the IDA-II scale and corrosion inhibitor. The Zn<2+> stabilizing capacity of the present inhibitor also surpasses that of IDA-II inhibitor. When the present inhibitor is added with a dosage of 50mg/L to 100mg/L, the phosphorcontent in the cooling water is only 0.210mg/L (calculated according to PO4<3-> content), thus the phosphor content is below the limited phosphor discharging quantity (which is below or equal to 0.5m/L) within the primary standard.

Description

Technical field: [0001] The invention relates to a multifunctional circulating cooling water treatment scale inhibitor slow-release agent, which is used in the water injection system of oil and gas fields to control scale, prevent corrosion, solve the problems of microbial growth and reproduction in water, and the like. Background technique: [0002] In industrial water, the consumption of cooling water ranks first, accounting for about 80%. The way to save cooling water is to use circulating cooling water and increase the concentration factor. However, in the circulating cooling water system, due to the increase of water temperature, evaporation of water, and the concentration of various inorganic ions and organic substances, the hardness, alkalinity and pH of the circulating water naturally increase, which makes the free and dissolved CO in the water 2 A large amount of escape, CaCO will be formed in the water supply pipes and water equipment 3 Precipitation, causing CaC...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multifunctional water treatment scale and slow-release agent, to solve the limitations of various series of scale and corrosion inhibitors, so that their application is limited, and to

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