一种低偏磷酸盐含量的三聚磷酸钠制备工艺研究  

Study on preparation technology of sodium tripolyphosphate with low metaphosphate content

作　　者：孙勋佳 路明清 屈云 李斌 孙浩 周勇 程传能 李正东 SUN Xunjia;LU Mingqing;QU Yun;LI Bin;SUN Hao;ZHOU Yong;CHENG Chuanneng;LI Zhengdong(Baokang Chufeng Chemical Co.,Ltd.,Xiangyang 441600,China)

机构地区：[1]保康楚烽化工有限责任公司,湖北襄阳441600

出　　处：《生态产业科学与磷氟工程》2025年第3期24-29,共6页Eco-industry Science & Phosphorus Fluorine Engineering

摘　　要：国内食品级三聚磷酸钠偏磷酸盐质量分数在2.4%~3.5%,为满足部分高端客户对低偏磷酸盐含量的三聚磷酸钠的需求,在普通三聚磷酸钠生产线上,考察原材料种类、催化剂、加热方式、料浆中和度、喷雾干燥温度、聚合温度等对产品品质的影响。结果表明,以w(H_(3)PO_(4))85%的湿法磷酸、w(NaOH)48%的液碱为原料,以硝酸铝钾为催化剂,在中和料浆中和度为2.99~3.05、喷雾干燥塔塔顶温度为300~310℃、聚合炉炉头温度为390~420℃、聚合炉转速24~26 r/min条件下,可成功制备出低偏磷酸盐含量的三聚磷酸钠,产品中偏磷酸盐质量分数低于1.5%。The mass fraction of metaphosphate in domestic food-grade sodium tripolyphosphate is 2.4%-3.5%.In order to meet the demand of some high-end customers for sodium tripolyphosphate with low content of metaphosphate,the impact of raw material type,catalyst,heating method,neutralization degree,spray drying temperature,polymerization temperature,etc.on product quality is investigated on the ordinary sodium tripolyphosphate production line.The results show that sodium tripolyphosphate with low metaphosphate content can be successfully prepared by using wet-process phosphoric acid with w(H_(3)PO_(4))85%,liquid alkali with w(NaOH)48% as raw materials,potassium aluminum nitrate as catalyst,under the conditions of neutralization degree of neutralization slurry being 2.99-3.05,temperature of spray drying tower top being 300-310℃,temperature of polymerization furnace head being 390-420℃,and polymerization furnace rotating speed being 24-26 r/min,the mass fraction of metaphosphate in the product is less than 1.5%.

关 键 词：三聚磷酸钠 低偏磷酸盐含量 工艺条件 

分 类 号：TQ126.35[化学工程—无机化工]