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| COMPARABLE STUDY ON SCALE INGIBITION EFFECT OF METHYLENEPHOSPHONIC ACIDS WITH STRUCTURE OF (HO)2OPCH2{N[CH2PO(OH)2]CH2CH2}nN[CH2PO(OH)2]2 |
| Yu Wang; |
| 北京石油大学 博士后信箱 |
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Abstract The scale inhibition effect of four methylenephosphonic acids with structure(HO)2OPCH2{N[CH2PO(OH)2]CH2CH2}n N[CH2PO(OH)2]2 (n=0,1,2,3,4)was compared by dynamic and static test methods.A dynamic mechanism of scale retarding effect was proposed based on analysis and calculation of the experimental data.The experimental results of dynamic method was different from those of static method in two aspects.First, according to dynamic tests the scale inhibition effect of the methylenephosphonic acides was not monotonously enhanced with the increase of their concentration,it may be weakened after a certain dosage.Second,their scale inhibition effect varied in the order:ATMP(m=3)＜EDTMP(m=4)＜TETHMP(m=6)＜DETPMP(m=5) from the dynamic tests rather than ATMP(m=3)＜EDTMP(m=4)＜DETPMP(m=5)＜TETHMP(m=6) from the static tests,here m referred to the number of CH2PO(OH)2group in a methylenephosphonic acid molecule.It was also found that the scale inhibition effect of the inhibitors was mainly due to the retarding of CaCO3 crystal growth rather than the reducing of the amount of calcium ions in solution.
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Received: 20 October 1998
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Corresponding Authors:
Yu Wang
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