Study of sophora flower bud extract/PBTCA complex component as a scale inhibitor against calcium sulfate
Static scale inhibition method was used to study the inhibition of calcium sulfate scale by sophora flower bud extract and its binary complex with 2-phosphonic-butane-1,2,4-tricarboxylic acid(PBTCA)in circulating cooling water.The results showed that the inhibition of calcium sulfate scale by single sophora flower bud extract increased first and then decreased with the increase of the concentration of sophora flower bud extract,and the optimal concentration was 21 mg/L.The scale inhibition rate can reach 20.45％,and the binary compound of the sophora flower bud extract and PBTCA shows good inhi-bition performance of calcium sulfate scale.The new green and environmental protection compound has a mass ratio of PBTCA∶sophora rice extract=1∶2.When the holding time is 4 h,the concentration of CaCl2 is 5.55 mg/mL,the holding temperature is 70 ℃,and the dosage is 21 mg/L,the inhibition rate of calci-um sulfate scale can reach 93.75％,the compound had no obvious regular structure,but was clumpy.The thermogravimetric analysis shows that the extracts of sophora flower bud can decompose at 250 ℃,show-ing good thermal degradation performance.
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