Phosphorus-free corrosion and scale inhibitor for water treatment and preparation method thereof

Abstract

The invention discloses a phosphorus-free corrosion and scale inhibitor for water treatment and a preparation method thereof. The phosphorus-free corrosion and scale inhibitor comprises the following raw materials in parts by weight: 30-50 parts of sodium metasilicate, 15-35 parts of ammonium acetate, 45-60 parts of succinylatedmonoglycerides, 10-20 parts of citric acid and 100-150 parts of water. The preparation method comprises the following steps: dissolving sodium metasilicate in half of the water to prepare a sodium metasilicate aqueous solution; dissolving ammonium acetate in the remaining half of the water to prepare an ammonium acetate aqueous solution; heating the sodium metasilicate aqueous solution to 60-90 DEG C, adding the citric acid, stirring for 30-50 minutes, then raising the temperature to 100-120 DEG C, adding succinylatedmonoglycerides, stirring for 5-10 minutes, adding the ammonium acetate aqueous solution, continuously stirring for 1-1.5 hours and reducing to a room temperature to obtain the phosphorus-free corrosion and scale inhibitor for water treatment. The phosphorus-free corrosion and scale inhibitor disclosed by the invention does not contain phosphorus and is non-toxic and pollution-free to an environment, good in corrosion and scale inhibition effect, rich in raw material source, simple in preparation process, low in cost and suitable for an industrial circulating cooling water system.

Description

[0001] This application is a divisional application with application number 2015104635982, application date of August 2, 2015, and title of invention "a non-phosphorus corrosion and scale inhibitor for water treatment and its preparation method". technical field [0002] The invention relates to the field of water treatment, in particular to a phosphorus-free corrosion and scale inhibitor for water treatment and a preparation method thereof. Background technique [0003] During the recycling process of industrial cooling water, there will be different degrees of inorganic salt deposition, corrosion, bacteria and algae growth and other problems, resulting in serious consequences such as reduced efficiency of heat exchange equipment, blockage, corrosion and perforation, and bring great hidden dangers to industrial production. . The use of appropriate corrosion and scale inhibitors and supporting water treatment agents can reduce the adverse effects caused by corrosion, scaling...

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Problems solved by technology

Chinese patents 200710052475, 200810039161, 200610127172, and 2009100205068 disclose the formulation of non-phosphorus corrosion and scale inhibitors, which contain molybdate and polyepoxysuccinic acid that play a role in corrosion inhibition, but the above corrosion and scale inhibitors The agent also contains other components such as polymaleic anhydride, acrylic acid copolymer, triethanolamine, benzotriazole (BTA) or tungstate, borate, etc., and the formula is complex

However, for chemical wastewater to be used as circulating cooling water after secondary biochemical treatment, there is no efficient phosphorus-free corrosion and scale inhibitor formula

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