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Citation: YIN Xiao-Shuang, YANG Wen-Zhong, TANG Yong-Ming, LIU Ying. Effect of PBTCA on Kinetics of Formation of BaSO₄ Crystal[J]. Chinese Journal of Applied Chemistry, ;2008, 25(3): 356-360. shu

Effect of PBTCA on Kinetics of Formation of BaSO₄ Crystal

1.
Institude of Water Treatment, Nanjing University of Technology, Nanjing 210009

Corresponding author: YIN Xiao-Shuang,
Received Date: 15 March 2007
Available Online: 24 May 2007

Effects of 2-phosphonobutane-1,2,4-tricarboxylic acid(PBTCA) on the nucleation kinetics of BaSO₄ were studied by means of solution conductivity measurement.According to the classic homogeneous nucleation theory,the surface free energy between BaSO₄ and supersaturated solutions was estimated to be 61.1 mJ/m² in the absence of PBTCA.It increases with increasing the concentration of PBTCA(to be 73.7 mJ/m² in the presence of 12 mg/L PBTCA).The induction periods of BaSO₄ of four supersaturated solutions can be prolonged in the presence of PBTCA,which increase from 61.6,39.9,6.5,3.1 s in the absence PBTCA to 18 000.4,7 204.2,800.8,60.3 s at a concentration of 12 mg/L of PBTCA.BaSO₄ crystal growth can be expressed as a first order reaction.The growth rate is decreased with the increase of the concentration of PBTCA.Especially at the lower supersaturation index,the growth rate constant is decreased by a factor of two orders of magnitude.PBTCA is adsorbed at active sites on the BaSO₄ crystal surface.The adsorption follows a Langmuir adsorption model.
- barium sulfate,
- conductivity,
- kinetics,
- PBTCA,
- scale inhibition
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of PBTCA on Kinetics of Formation of BaSO₄ Crystal