37971-36-1

Basic information

• Product Name: 2-Phosphonobutane-1,2,4-tricarboxylic acid
• Synonyms: 2-PHOSOPHONOBUTANE-1,2,4-TRICARBOXYLIC ACID;2-PHOSPHONOBUTANE-1,2,4-TRICARBOXYLIC ACID;2-PHOSPHOBUTANE-1,2,4-TRICARBOXYLIC ACID;PBTC;PBTCA;2,4-Butanetricarboxylicacid,2-phosphono-1;2-phosphono-1,2,4-butanetricarboxylic;2-Phosphono-1,2,4-butanetricarboxylicacid
• CAS NO: 37971-36-1
• Molecular Formula: C7H11O9P
• Molecular Weight: 270.13
• EINECS: 253-733-5
• Product Categories: Industrial/Fine Chemicals;Phosphonate antiscalant;Water treatment
• Mol File: 37971-36-1.mol

Chemical Properties

• Boiling Point: 545.2 °C at 760 mmHg
• Flash Point: 283.5 °C
• Appearance: Clear colorless to yellowish liquid
• Density: 1.25 (50% aq.)
• Vapor Pressure: 0mmHg at 25°C
• Refractive Index: 1.579
• Solubility: Completely miscible in water
• PKA: 1.14±0.10(Predicted)
• Water Solubility: 909g/L at 20℃
• CAS DataBase Reference: 2-Phosphonobutane-1,2,4-tricarboxylic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 2-Phosphonobutane-1,2,4-tricarboxylic acid(37971-36-1)
• EPA Substance Registry System: 2-Phosphonobutane-1,2,4-tricarboxylic acid(37971-36-1)

Safety Data

• Hazard Codes: Xi;Xn,Xn,Xi
• Statements: 34
• Safety Statements: 26-45
• RIDADR: UN 3265
• HazardClass: 8
• PackingGroup: III
• Hazardous Substances Data: 37971-36-1(Hazardous Substances Data)

Usage

Uses

Used in Water Treatment Industry:
2-Phosphonobutane-1,2,4-tricarboxylic acid is used as a scale and corrosion inhibitor for its effectiveness in preventing the formation of calcium carbonate and calcium phosphate scales, making it ideal for use in circulating cooling water systems and oilfield water injection systems.
Used in Chemical Compounding:
PBTC is utilized as a stabilizer for zinc salts, enhancing the performance of these compounds in various applications, particularly when compounded with copolymers.
Used in Washing Industry:
2-Phosphonobutane-1,2,4-tricarboxylic acid serves as a chelating agent and metal cleaning agent, thanks to its ability to bind and remove metal ions, making it a valuable component in the formulation of cleaning products.

InChI:InChI=1/C7H11O9P/c1-2-3(17(14,15)16)7(4(8)9,5(10)11)6(12)13/h3H,2H2,1H3,(H,8,9)(H,10,11)(H,12,13)(H2,14,15,16)

Upstream product

• 292638-85-8 acrylic acid methyl ester 
• 140-88-5 ethyl acrylate 
• 141-05-9 Diethyl maleate 

Relevant articles and documents

Preparation method of low-phosphorous corrosion and scale inhibitor PBTCA (2-phosphonobutane-1,2,4-tricarboxylic acid)

The invention discloses a preparation method of low-phosphorous corrosion and scale inhibitor PBTCA (2-phosphonobutane-1,2,4-tricarboxylic acid). Certain amounts of diethyl phosphite and diethyl maleate are added to a reaction kettle, a condensation reflux device and a stirrer are started, a certain amount of a catalyst A is slowly dropwise added under the stirring condition that the revolving speed of the stirrer is 200 r/min, and the mixture reacts for 1 h after the temperature is increased to 100 DEG C; then the temperature is decreased to 50 DEG C, a certain amount of ethyl acrylate is added, and the mixture reacts for 8 h in the stirred state; then a certain amount of a catalyst B is added to the reaction kettle, the mixture is heated to 80 DEG C for hydrolysis for 0.5 h, and a finally obtained product, namely, PBTCA, is a yellowish-brown viscous liquid. The preparation method of PBTCA has the advantages of simple process route, convenience in operation, low three-waste emission and the like, and can be widely applied to corrosion and scale inhibition of industrial recirculating cooling water systems.

Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali metal salts thereof

This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.