CAS number：2809-21-4
molecular formula：C2H8O7P2
molecular weight：206.03
EINECS number：220-552-8

English synonyms

ETHANE-1-HYDROXY-1,1-DIPHOSPHONICACID,95+%;(1-Hydroxyethylidene)biphosphonicacid;HydroxyethylideneDiphosphonicacid(HEDP);1-Hydroxyethylidene-1,1-diphosphonicacid,min.95%HEDPChemicalbook;1-Hydroxyethan-1,1-diphosphonsure;1-HYDROXYETHYLIDENE-1,1-DIPHOSPHONICACIDHEDP;1-Hydroxyethylidene-1,1-bis-(phosphonicacid);1-HYDROXYETHYLIDENE-1,1-DIPHOSPHONICACID,98%HEDP

Related categories

Organic Building Blocks; Water Treatment Agents; Intermediates; Small Molecular Inhibitors; Pharmaceutical Raw Materials; Phosphine Ligands; Organophosphorus; Electroplating Chemicals; Organic Inorganic Chemicals; Organophosphine Scale and Corrosion Inhibitors; Products; scale inhibitor and dispersant; water treatment raw materials; chemical raw materials; organic chemical raw materials; chemical raw materials-1; organic chemical raw materials; chemical intermediates; inorganic chemical raw materials; raw materials; chemical raw materials; chemical products; new materials for chemical synthesis;Industrial/FineChemicals;INORGANIC&ORGANICCHEMChemicalbookICALS;AnalyticalChemistry;LigandsforPharmaceuticalResearch;RadiopharmaceuticalChemistry(ChelatingReagents);Phosphonateantiscalant;organophosphoruscompound;Watertreatment;Fine chemical raw materials; energy; chemical materials; biochemical industry; inorganic salts; organic raw materials

Introduction

This product is the main material for cyanide-free electroplating. It is formulated into a cyanide-free copper electroplating solution, and the direct electroplating copper layer on sodium iron has good adhesion. The coating is smooth and the color is good.

Chemical properties

The pure product is white crystal. The industrial product is colorless to pale yellow transparent liquid. Soluble in water, soluble in methanol and ethanol. Hydroxyethylidene diphosphonic acid is a chemical raw material commonly used in industrial water treatment, household cleaning products and personal care products.

Use

 ●  This product is the main material for cyanide-free electroplating. It is formulated into a cyanide-free copper electroplating solution, and the direct electroplating copper layer on sodium iron has good adhesion. The coating is smooth and the color is good. The general dosage of 60% content is 100 ~ 120ml/L. The dosage of copper sulfate is 15～20g/L. In addition, before electroplating, immerse the plated parts in a 1% to 2% solution of this product to make the plated parts into an activated state, and then electroplating can improve the effect.

●  Hydroxyethylidene diphosphonic acid (HEDP) is a new type of chlorine-free electroplating complexing agent. It is used as the main agent for stable water quality in the circulating cooling water system, and plays the role of corrosion and scale inhibition. This product is one of the organic polyphosphonic acid-free water tablet conditioners. There are also some other varieties of such products produced in China, such as aminotrimethylenephosphonic acid (ATMP): [CH2PO(OH)2]3N and ethyl acetate. Diamine tetramethylene phosphoric acid (EDTMP Chemicalbook) and so on. Organic polyphosphonic acid is a type of water treatment agent developed in the late 1960s and confirmed around the 1970s. Compared with organic polyphosphates, organic polyphosphonates have the characteristics of good chemical stability, not easy to hydrolyze, high temperature resistance, small chemical dosage, and anti-scaling properties. It is a cathodic corrosion inhibitor and a non-stoichiometric scale inhibitor; when used in combination with other water treatment agents, it exhibits an ideal synergistic effect. It has excellent chelating energy for many metal ions such as calcium, magnesium, copper, zinc, etc., and even has a good deactivation effect on inorganic salts of these metals such as CaSO4, CaCO3, MgSiO3, etc., so it is widely used in water treatment. technology.

●  Phosphorylation reagents for protected serine and pyranose.

Production method

●  Through the nucleophilic addition of diethylenetriamine and formaldehyde, the addition product is esterified with phosphorus trichloride hydrolyzate, and the product is neutralized. See EDTMP for details.

●  In industry, glacial acetic acid and phosphoryl trichloride are usually used, and then the acylation product and phosphorous trichloride hydrolyzate are condensed. Add the metered amount of water and glacial acetic acid into the reaction kettle and stir evenly. Phosphorus trichloride was added dropwise under cooling, and the reaction temperature was controlled at 40-80°C. The reaction by-product hydrogen chloride gas is condensed and sent to the absorption tower to recover hydrochloric acid. The overflowing acetyl Chemicalbook chlorine and acetic acid were condensed and returned to the reactor. After dropping phosphorus trichloride, the temperature was raised to 100-130°C, and refluxed for 4-5h. After the reaction is completed, it is hydrolyzed with water vapor, and the residual acetic acid and low boilers are distilled off. get product.

●  It is obtained by mixing phosphorus trichloride and glacial acetic acid, heating and distillation to obtain acetyl chloride (see 00510), and then reacting with phosphorous acid. The commercial product is a viscous liquid diluted with water to a content of 50%. Each ton of product consumes 931kg of phosphorus trichloride (95%) and 591kg of glacial acetic acid.

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