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Pyrophosphoric acid

Preparation Reactions
Pyrophosphoric acid
Pyrophosphoric acid structure
CAS No.
2466-09-3
Chemical Name:
Pyrophosphoric acid
Synonyms
eizh;iphosphoricaci;DIPHOSPHORIC ACID;PYROPHOSPHORIC ACID;Diphosphoric(V) acid;PYROPHOSPHORIC ACID, 90+%;PYROPHOSPHORIC ACID, TECH.;Pyrophosphoric acid syrupy;Pyrophosphoric acid technical grade;Pyrophosphoric acidDiphosphoric acid
CBNumber:
CB0740227
Molecular Formula:
H4O7P2
Formula Weight:
177.98
MOL File:
2466-09-3.mol

Pyrophosphoric acid Properties

Melting point:
61 °C
Density 
approximate 1.9g/ml (25℃)
pka
0.99±0.10(Predicted)
form 
white crystals
Water Solubility 
709g/100mL H2O (23°C); soluble alcohol, ether [MER06]
Merck 
13,8098
InChIKey
XPPKVPWEQAFLFU-UHFFFAOYSA-N
CAS DataBase Reference
2466-09-3(CAS DataBase Reference)
EWG's Food Scores
1
FDA UNII
4E862E7GRQ
EPA Substance Registry System
Diphosphoric acid (2466-09-3)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS05,GHS07
Signal word  Danger
Hazard statements  H302-H314
Precautionary statements  P280-P305+P351+P338-P310
Hazard Codes  C
Risk Statements  22-34
Safety Statements  26-36/37/39-45
RIDADR  UN 3260 8/PG 2
WGK Germany  3
RTECS  JL6672500
3-9-21
HazardClass  8
PackingGroup  III
HS Code  28092000
NFPA 704
1
3 1

Pyrophosphoric acid price More Price(1)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 433314 Pyrophosphoric acid technical grade 2466-09-3 100g $70.1 2021-03-22 Buy

Pyrophosphoric acid Chemical Properties,Uses,Production

Preparation

Pyrophosphoric acid may be prepared by heating orthophosphoric acid at 215°C:
2H3PO4 → H4P2O7 + H2O
The acid solution in pure form can be obtained by ion exchange, passing an aqueous solution of sodium pyrophosphate, Na4P2O7, through a suitable cation exchange column.

Reactions

The acid has four replacable H+ ions. Its dissociation constants indicate that two H+ ions are strongly acidic while the other two protons are weakly acidic. The first dissociation constant especially is very large:
H4P2O7 + H2O ↔ H3O+ + H3P2O7¯          Ka1 ~ 10–1
H3P2O7¯+ H2O ↔ H3O+ + H2P2O72–         Ka2 ~ 1.5x10–2
PHOSPHORIC ACID, PYRO 701H2P2O72¯ + H2O ↔ H3O+ + HP2O73–      Ka3 ~ 2.7x10–7
HP2O73¯ + H2O ↔ H3O+ + P2O74¯          Ka4 ~ 2.4x10–10
Pyrophosphoric acid forms acid salts, such as NaH3P2O7 and Na2H2P2O7.

Description

Pyrophosphoric acid, also known under the name diphosphoric acid, is colorless, odorless, hygroscopic and is soluble in water, diethyl ether and ethyl alcohol. It is produced from phosphoric acid by dehydration. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.
H4P2O7 +H2O?2H3PO4
Upon heating, phosphoric acid loses water, being converted successively, and to some extent concurrently, into the pyro- and meta-acids:
2H3PO4?H4P2O7 +H2O
nH3PO4?(HPO3)n + [H2O]n

Chemical Properties

White to very pale yellow glassy solid

Physical properties

Colorless needles or liquid; hygroscopic. Crystallizes in two anhydrous forms: a metastable form melting at 54.3°C and a second and more stable form melting at 71.5°C; extremely soluble in cold water, reacting very slowly to form phosphoric acid; decomposing much faster in hot water; very soluble in alcohol and ether.

Uses

Catalyst, manufacture of organic phosphate esters, metal treatment, stabilizer for organic per- oxides.

Preparation

According to early investigators, the pyro-acid is formed as low as 100 °C, and the conversion is complete between 255 and 260 °C. Phosphorous oxychloride reacts with phosphoric acid in the following manner:
5H3PO4 + POC13?3H4P2O7 + 3HC1
A mixture of the ortho- and meta-acids may be condensed together to form the pyro-acid by heating on the water bath:
nH3PO4 +[HPO3]n?[H4P2O7]n

Definition

ChEBI: An acyclic phosphorus acid anhydride obtained by condensation of two molecules of phosphoric acid.

Pyrophosphoric acid Preparation Products And Raw materials

Raw materials

Preparation Products


Pyrophosphoric acid Suppliers

Global( 140)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 22607 55
Hubei xin bonus chemical co. LTD
86-13657291602
027-59338440 linda@hubeijusheng.com CHINA 23035 58
Shandong chuangyingchemical Co., Ltd.
18853181302
sale@chuangyingchem.com CHINA 5917 58
Chongqing Chemdad Co., Ltd
+86-13650506873
sales@chemdad.com CHINA 37282 58
Zhuozhou Wenxi import and Export Co., Ltd
+8613111626072 (WhatsApp)
Wechat: +8613111626072 Wickr me: waynehu zzwenxi@126.com CHINA 13187 58
Antai Fine Chemical Technology Co.,Limited
18503026267
info@antaichem.com CHINA 9664 58
Zhengzhou Alfa Chemical Co.,Ltd
+8613343822234 +86-0371-55052911
sales5@alfachem.cn;sales9@alfachem.cn;sale1@alfachem.cn China 11816 58
Hefei TNJ Chemical Industry Co.,Ltd.
0551-65418671
0551-65418697 sales@tnjchem.com CHINA 37441 58
Baoji Guokang Healthchem co.,ltd
09178656283
cngksw@aliyun.com CHINA 9475 58
Dayang Chem (Hangzhou) Co.,Ltd.
17705817739 +86-571-88938639
+86-571-88938652,+86-571- 88492614 info@dycnchem.com CHINA 52932 58

View Lastest Price from Pyrophosphoric acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-08-12 Pyrophosphoric acid
2466-09-3
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd

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