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

Shuangxi Shao, Lan Jiang, Ya Li, Kaiqi Shi

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)

Abstract

At present, tetra-hydroxymethyl phosphonium chloride (THPC) is widely used in flame retardant finishing, industrial water treatment and leather manufacture industry etc., and its decomposition which was caused by pH changing will influence on the actual application. So acid-alkali decomposition of THPC was studied by 31P Nuclear Magnetism Resomance ( 31P NMR), spectrophotometry and titration respectively. The results show that THPC solution is stable when pH<5.0, containing THPC, tri-hydroxymethyl phosphine (TrHP), and tri-hydroxymethyl phosphine oxide (TrHPO). THPC begins 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, which could give a favorable guide in THPC application.

Original languageEnglish
Title of host publicationMaterial Sciences and Technology
Pages237-241
Number of pages5
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 Spring International Conference on Material Sciences and Technology, MST-S - Xi'an, China
Duration: 27 May 201230 May 2012

Publication series

NameAdvanced Materials Research
Volume560-561
ISSN (Print)1022-6680

Conference

Conference2012 Spring International Conference on Material Sciences and Technology, MST-S
Country/TerritoryChina
CityXi'an
Period27/05/1230/05/12

Keywords

  • Acid-alkali decomposition
  • P nuclear magnetic resonance
  • Tetra-hydroxymethyl phosphonium chloride (THPC)

ASJC Scopus subject areas

  • General Engineering

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