Dimethyl phosphoric acid amino methane sulfonic acid (DPAMS)

Dimethyl phosphoric acid amino methane sulfonic acid (DPAMS)

[Structural formula]

[Physical and chemical properties] White or yellow transparent viscous liquid, easily soluble in water

[Preparation]

① Preparation of sulfamic acid

NH ₃ +HCHO+SO ₂ →H ₂ NCH ₂ SO ₃ H

A certain amount of concentrated ammonia water with a mass fraction of 25% is added to the reaction kettle, and a 37% aqueous formaldehyde solution with a mass fraction of 37% is slowly added at room temperature, and the acceleration is controlled so that the temperature in the kettle does not exceed 30°C

② Preparation of dimethyl phosphoric acid amino methanesulfonic acid

Dissolve 297 parts of amino methanesulfonic acid in 72 parts of water, slowly add 162 parts of 37% aqueous formaldehyde solution to the above aqueous solution under stirring, control the reaction temperature at 30-35°C, and after the addition of the aqueous formaldehyde solution is completed, Continue to stir the reaction for 30 minutes, then slowly increase the reaction temperature to 50°C, and keep the reaction at this temperature for 30 minutes

[Application] DPAMS introduces sulfonic acid group into the molecule of phosphonic acid type scale inhibitor and dispersant to form sulfonic acid phosphoric acid type scale inhibitor and dispersant

Because of these characteristics of sulfonic acid-containing phosphoric acid, it has attracted attention as a scale inhibitor and dispersant in industrial cooling water systems