镁离子对水溶性聚磷酸铵的水解影响研究

doi:10.11962/1006-4990.2019-0590

无机盐工业 ›› 2020, Vol. 52 ›› Issue (10): 72-76.doi: 10.11962/1006-4990.2019-0590

镁离子对水溶性聚磷酸铵的水解影响研究

王燕(),王辛龙,许德华,许德军,杨晶旭

四川大学化学工程学院,教育部磷资源综合利用与清洁加工工程研究中心,四川成都 610065

收稿日期:2020-04-22 出版日期:2020-10-10 发布日期:2020-11-24
作者简介:王燕（1994— ）,女,硕士研究生,主要从事水溶性聚磷酸铵的分析与水解研究;E-mail: Ellisa61@163.com。
基金资助:
十三五国家重点研发计划项目(2016YFD0200404);四川省科技创新人才项目(2018RZ0145);四川省实验室建设项目(2018sfgw003)

Effect of Mg²⁺ on hydrolysis of water soluble ammonium polyphosphate

Wang Yan(),Wang Xinlong,Xu Dehua,Xu Dejun,Yang Jingxu

Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources,Ministry of Education,School of Chemical Engineering,Sichuan University,Chengdu 610065,China

Received:2020-04-22 Published:2020-10-10 Online:2020-11-24

摘要/Abstract

摘要：

近年来水溶性聚磷酸铵（APP）作为螯合液体肥在农业上得到了广泛关注和应用。以两种不同聚合度分布的水溶性APP为原料,系统研究了Mg²⁺对两种水溶性APP的水解的影响。研究结果表明：在60 ℃反应110 h后,APP2溶液中Mg²⁺的质量分数为0、0.5%、1.0%、1.5%、2.0%时,其正磷酸铵的质量分数从未反应时的8.1%分别变为32.7%、31.3%、28.1%、30.7%、32.1%;APP8溶液中Mg²⁺的质量分数为0、0.5%、1.0%、2.0%、4.0%时,其正磷酸铵的质量分数从未反应时的13.3%分别变为53.3%、51.5%、51.6%、52.4%、46.9%。结合一级反应动力学模型,计算发现Mg²⁺对水溶性APP的水解具有减缓作用。不同聚合度分布的水溶性APP在相同Mg²⁺浓度下正磷酸铵含量的变化量有差异,针对作物需求,应该使用不同品质的水溶性APP。

关键词: 聚磷酸铵, 水解, 镁离子, 聚合度分布

Abstract:

Water-soluble ammonium polyphosphate（APP） as a chelated liquid fertilizer has received extensive attention and application in agriculture in recent years.The effect of magnesium ion on the hydrolysis of two water-soluble APPs was systematically studied by using water-soluble APP with two different polymerization degrees as raw materials.The results showed that the mass fraction of ammonium orthophosphate changed from 8.1% to 32.7%,31.3%,28.1%,30.7% and 32.1% when the mass fraction of Mg²⁺ in APP2 solution increased from 0 to 0.5%,1.0%,1.5% and 2.0% after 110 h at 60 ℃.When the mass fraction of Mg²⁺ in the APP8 solution increased from 0 to 0.5%,1.0%,2.0%,and 4.0%,the mass fraction of ammonium orthophosphate changed from 13.3% to 53.3%,51.5%,51.6%,52.4%,and 46.9%,respectively.Combined with the firstorder reaction kinetics model,it was found that Mg²⁺ had a slowing effect on the hydrolysis of water-soluble APP.The water-soluble APP with different polymerization degree distribution had different changes in the content of ammonium orthophosphate at the same Mg²⁺ concentration.For the crop demand,different quality water-soluble APP should be used.

Key words: ammonium polyphosphate, hydrolysis, magnesium ion, degree of polymerization distribution

中图分类号:

TQ126.3

王燕,王辛龙,许德华,许德军,杨晶旭. 镁离子对水溶性聚磷酸铵的水解影响研究[J]. 无机盐工业, 2020, 52(10): 72-76.

Wang Yan,Wang Xinlong,Xu Dehua,Xu Dejun,Yang Jingxu. Effect of Mg²⁺ on hydrolysis of water soluble ammonium polyphosphate[J]. Inorganic Chemicals Industry, 2020, 52(10): 72-76.

图/表 6

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镁离子对水溶性聚磷酸铵的水解影响研究

Effect of Mg²⁺ on hydrolysis of water soluble ammonium polyphosphate

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镁离子对水溶性聚磷酸铵的水解影响研究

Effect of Mg2+ on hydrolysis of water soluble ammonium polyphosphate

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Effect of Mg²⁺ on hydrolysis of water soluble ammonium polyphosphate