CAS 2809-21-4 Industrial Grade 60% 90% 1-Hydroxyethylidene-1, 1-Diphosphonic Acid HEDP

nature
Colorless to light yellow viscous liquid. The pure product is a colorless, amorphous crystal that is miscible with water. Soluble in water, methanol, ethanol. It has a large dissociation constant in water and can form stable chelates and complexes with metal ions. It can form stable adducts with compounds containing active oxygen to keep active oxygen stable. Good chlorine resistance. The content of industrial products is generally 50% ~ 62% colorless to light yellow viscous transparent aqueous solution, which is a multi-acid and easily soluble in water. HEDP is an important chelating agent, which has a stable chelating structure with several metal ions and is not easily hydrolyzed. It does not decompose under general photothermal conditions, but it is not resistant to the action of oxidation biocides, and about 30% of the HEDP with residual chlorine of 5mg/L is decomposed.

preparation
It is prepared by the reaction of phosphorus trichloride, glacial acetic acid and water. Or by the reaction of orthophosphoric acid, acetic anhydride and acetyl chloride. It can also be prepared by the reaction of phosphorous acid and acetic anhydride. It can also be reacted with orthophosphate and acetic anhydride.

use
It is a scale inhibitor and corrosion inhibitor for boiler and heat exchanger, a complexing agent for cyanamide free electroplating, a soap chelating agent, a cleaning agent for metal and non-metal. As a water treatment agent, HEDP has stable structure and is not easy to hydrolyze. HEDP is a cathodic corrosion inhibitor, and its corrosion inhibition rate is about 4 times higher than that of inorganic polyphosphate. Iron ion in water has a significant effect on the corrosion inhibition of HEDP. When the iron ion concentration is greater than 3mg/L, the corrosion inhibition of HEDP decreases exponentially with the increase of iron ion concentration. HEDP has synergistic effect with other corrosion inhibitors and scale inhibitors, such as chromate, polyphosphate, molybdate, silicate, nitrite, zinc salt, polycarboxylate and its derivatives, and can improve drug efficacy. The dosage is low, and the dosage used in the composite formula is generally 2 ~ 5mg/L.

1-Hydroxyethylidene-1,1-diphosphonic acid - Physico-chemical Properties

Located in Guangrao County of Dongying City in the central city of the Yellow River Delta of China, Dongying Hengyu Chemical Co., Ltd enjoys superior geographical location, developed economy and convenient transportation. At present, we are a diversified & integrated enterprise specializing in the research and development, production and sales of chemical products.
Now, our business scope mainly involves pharmaceuticals, pesticide intermediates and fine chemicals and other fields. Under the support of strong technical force, advanced testing instruments and well-operated production equipment, as well as a work team with professional knowledges and rich sales experiences, we have successfully established and founded the markets for our products, which own great market potential.
Our main products are: dichloroacetyl chloride, acetyl chloride, trichloroethylene, trimethylacetyl chloride, trimethyl orthoacetate, n-butyryl chloride, aluminum chloride (anhydrous), trimethyl orthoformate, chloroacetyl chloride, phosphorous acid, N,N-dimethylformamide, propionic acid, cyclohexanone, isobutyryl chloride, trichloroacetyl chloride and other products.
Sticking to such service tenet of "reputation first, integrity based, getting survival by excellent quality", taking the quality of customers as the lifeblood of enterprises and enterprise management as the foundation, as well as focusing on honest business, we work hard to provide customers with high-quality products and thoughtful services.
 
We look forward to maintaining mutual-trusting, mutual-benefited, win-win and stable cooperative relations with friends at home and abroad, and working together for achieving a long-term development!

 

1.Q:Are you manufacturer?
A: As an integrated enterprise, we have our own production lines Dichloroacetyl chloride. Meanwhile we are one of the experienced distributors for other chemicals such as Methylene Chloride, Chloroform, Aniline oil, cyclohexanone, Dimethyl Formamide, Propylene Glycol, Ethylene Glycol, Dimethyl Carbonate, etc. We have competitive price benefited by ready stock and good relations with some leading chemical manufacturers.
2.Can I get samples ?
 Yes, we can supply specified quantity free sample, you pay for the freight charge only.
3.Which documents do you support?
We can supply COA, TDS, MSDS and so on.
4.What is your MOQ? 
A: Normally our MOQ is 20'FCL for each product. Other quantity kindly contact us for sure.
5. How can you guarantee the quality of your products?
(1)Our staff are all experienced in chemical products or related major background, they are well trained before quotation.
   (2) Free sample or pre- shipment sample are available for our new cooperation before you place commercial order. We are sure the same specification commercial products as sample to customers.
  (3) Third Party Inspection like SGS can be arranged according to your requirement before shipping.
  (4) On-Spot QC in our APPROVED associated production bases with necessary certification like GMP, ISO etc.
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7.Q :Which kind of payment terms do you accept?
A:We prefer TT, LC payment terms. Other payment terms are flexible to be further discussed.
8.Q: What kind of package do you have?
A: We have various of packages to meet needs of our customers,like Iron drums,plastic drums, IBC tanks, Flexitank, ISO TANK and bags etc.
9.Q:What is your after-sales service?
Dongying Hengyu CHEMICAL aim to keep long term cooperation with all the customers, will sign a legally binding sales contract with customers for every order.  If you have doubt or concern on our products or service, pls feel free to contact with us.
10.Q: What's your delivery time?
A: Usually we will arrange the shipment in 7 -15 days.