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Diethylene triamine pentamethylene phosphonic acid (DTPMP)
[Structural formula]
Diethylene triamine pentamethylene phosphonic acid is abbreviated as DTPMP.
The monomer contains multiple phosphoric acid groups and nitrogen atoms.
It is easily dissociated into 10 positive and negative ions in water, and can form a stable polycyclic ring with divalent or trivalent metal ions.
Chelate
.
At the same time, it can also produce lattice distortion with some sediments, resulting in a threshold effect
[Physicochemical properties] red-brown viscous liquid, miscible with water, for calcium carbonate , calcium sulfate and barium sulfate are deposited good scale inhibition, especially an alkaline solution at pH 10 to 11, calcium carbonate The deposition still has a good scale inhibition effect, and its scale inhibition rate is 2 to 3 times higher than that of HEDPA and ATMP
.
DTPMP has stable chemical properties and is not easy to decompose in strong acid and alkali media.
[Preparation method] DTPMP can be synthesized from different raw materials and through different process routes, but the industrial methods mainly include the following two: ①synthetic method of diethylenetriaminepentaacetic acid and phosphorous acid or phosphorus trichloride ; ②diethylenetriamine Amine, formaldehyde aqueous solution, phosphorus trichloride or phosphorous acid synthesis method
.
The reaction formula is as follows:
61 parts of diethylenetriamine and 95 parts of tap water were added to the reaction kettle and cooled to room temperature
.
Then slowly add 425 parts of phosphorus trichloride, control the feeding rate, and cool it with cooling water if necessary to keep the temperature in the kettle below 40°C
[Technical Index] HG/T3777-2005
[application]
(1) Mechanism of action
Diethylene triamine pentamethylene phosphonic acid (DTPMP) is a cathodic corrosion inhibitor that can form stable complexes with a variety of metals
.
It can dissociate into 10 positive and negative ions in an aqueous solution, which can be chelated with two or more metal ions to form two or more three-dimensional macromolecular viscous complexes, which are loosely dispersed in water to destroy calcium carbonate and other calcium Salt crystals grow, thereby playing a role in scale inhibition
(2) As scale and corrosion inhibitor
DTPMP is a cathodic scale and corrosion inhibitor with a concentration of less than 3mg/L.
It has good synergy with polycarboxylates and nitrites.
(3) Other uses
DTPMP can also form stable adducts with active oxygen compounds (such as H 2 O 2 etc.
) to keep active oxygen stable
.
Such as hydrogen peroxide stabilizer (addition amount is 1%-10%)
Related Links: 1-Hydroxyethane-1,1-Diphosphonic Acid (HEDP) Application
