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2-phosphonobutane 1,2,4 tricarboxylic acid (PBTC)
[Structural formula]
2-Phosphonic acid butane-1,2,4-tricarboxylic acid is abbreviated as PBTC.
Its molecular structure contains both phosphine group—PO 3 H 2 and carboxyl group—COOH, so that PBTC can operate at high temperature, high hardness and high pH value.
Under water quality conditions, it has better scale inhibition performance than commonly used organic polyphosphonic acids
.
Compared with organic polyphosphonic acid, PBTC is not easy to form insoluble calcium phosphonate
[Physical and chemical properties] Appearance is colorless or light yellow, almost odorless transparent liquid
.
Usually it is an aqueous solution with a solid content of (50±1)%
[Preparation method] At present, the technical route of Bayer Company in Germany is generally adopted in China: ① Phosphite and succinate undergo a nucleophilic addition reaction under the action of a catalyst to generate tetraalkyl phosphoryl succinate; ② Phosphoryl succinate four Alkyl ester and acrylic ester undergo a Michael addition reaction under the action of a catalyst to generate 2-phosphono-J alkane-1,2,4-tricarboxylic acid pentaalkyl ester; ③2-phosphonobutane-1,2,4-tricarboxylate The acid pentaalkyl ester is hydrolyzed in an acidic medium to obtain the final product PBTC
.
The process route is as follows:
The R here is mainly Me or Et
.
In addition, acrylonitrile can also be used to replace acrylic acid, but the product involves highly toxic cyanide during the synthesis process, causing secondary pollution to the environment, so this route is hardly adopted in industrial production
[Technical index]HG/T3662-2000
[Application] PBTC is a water treatment agent with high scale and corrosion inhibition performance, strong chemical stability and low toxicity
.
Under severe conditions, such as high temperature, high hardness, and high alkalinity, it can play a strong anti-scaling effect, especially in the presence of Fe 3+ , its anti-scaling performance is better than other organic phosphates; its anti-scaling performance to sulfates Slightly worse
PBTC can be used for water treatment in petroleum, chemical, power generation, and industrial boilers
.
The amount to be added should be determined after testing according to the on-site water quality and water system operating conditions.
Related link: Polyoxyethylene octylphenol ether phosphate
