Neutral rust removing detergent

Abstract

The invention discloses a neutral rust removing detergent, which mainly comprises organic acid, chemical cosolvent, value regulator and water. The organic acid can be glycolic acid, citric acid, oxalic acid or the like. The cosolvent can be NH4HF2, NaF, NH2CONH2 or the like; and the value regulator is alkali value regulator. The neutral rust removing detergent is prepared by the following steps of: dissolving the organic acid into the water, performing gentle heating so that the organic acid is dissolved, adding the cosolvent, and then adding the value regulator to regulate the solution to be neutral. The preparation process is simple and low in cost, the cleaning is not limited by temperature, and the rust removing detergent has good rust removing effect; and because both the detergent and the waste solution are neutral, the corrosion to equipment, particularly to carbon steel and stainless steel equipment is low. After cleaning, a passivating agent for passivating can be directly added into the waste solution. The passivating effect is good, and the equipment is not easily corroded. The cleaning process is simplified.

Description

technical field [0001] The invention relates to a cleaning agent, in particular to a neutral rust-removing cleaning agent. Background technique [0002] In petrochemical, industrial chemical and other industries, some large devices and pipelines need to be derusted before driving. Now various rust removers have been widely used industrially; in the previous cleaning agent formula, due to the unscientific addition ratio, the cleaning agent was highly acidic and highly corrosive to the equipment body; in addition, the product composition was complex, and in the In the actual industrial configuration, the process control requirements are strict and the cost is high. In the past, acidic cleaning agent was used, and its formula was: ① Inorganic acid, Bluestar corrosion inhibitor; ② Citric acid, ammonia water. The inorganic acid in formula ① can be one or more of hydrochloric acid, nitric acid, and hydrofluoric acid; formula ② is also cleaned under the condition of acidic pH val...

AI Technical Summary

Problems solved by technology

Both of these cleaning solutions are highly acidic and severely corrosive to equipment. The discharge of waste liquid is also harmful to the environment. The cleaning solution is highly volatile and not conducive to long-term storage.

In addition, the neutral degreasing and derusting cleaning agent mentioned in the patent No. CN 1297646C has many reagent components, high cost, dissolution is limited by temperature, and the cleaning time is relatively long

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