Effect of pH on the phosphorous components of tetra-hydroxymethyl phosphonium chloride solution

Kaiqi Shi, Lan Jiang, Ya Li, Shuangxi Shao

Research output: Contribution to conferencePaperpeer-review

Abstract

At present, tetra-hydroxymethyl phosphonium chloride (THPC) is widely used in textile flame retardant finishing, industrial water treatment and leather manufacture industry etc., and its decomposition caused by pH changes will influence on the actual application and the quality of final products. Therefore, acid-alkali decompositions of THPC under different pH were studied by 31P Nuclear Magnetic Resonance (31P NMR), spectrophotometry and titration respectively. The results reveal that THPC solution is stable when pH<5.0, containing THPC, tri-hydroxymethyl phosphine (TrHP), and tri-hydroxymethyl phosphine oxide (TrHPO). THPC starts to decompose at pH5.0 and yields an unstable substance tetra-hydroxymethyl phosphonium hydroxide (THPH), whose chemical shifts is 36ppm. At pH8.0, THPC converts to TrHP and TrHPO completely. When pH>9.0, all of the phosphorus compounds converts to TrHPO. Consequently, THPC content decreases when pH of the THPC solution rising, meanwhile, which could give a favorable guide in THPC application.

Original languageEnglish
Publication statusPublished - 2011
Event31st Congress of the International Union of Leather Technologists and Chemists Societies, IULTCS 2011 - Valencia, Spain
Duration: 27 Sep 201130 Sep 2011

Conference

Conference31st Congress of the International Union of Leather Technologists and Chemists Societies, IULTCS 2011
Country/TerritorySpain
CityValencia
Period27/09/1130/09/11

Keywords

  • P NMR
  • Acid-alkali decomposition
  • Phosphorous compound
  • Tetra-hydroxymethyl phosphonium chloride

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering

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