微波加热合成聚磷酸铵的工艺研究

doi:10.11962/1006-4990.2019-0485

Abstract

Abstract:

The optimal polymerization conditions of ammonium polyphosphate were studied by microwave heating using ammonium dihydrogen phosphate and urea as raw materials.The effects of different ratios of raw materials,reaction temperature and reaction time on the contents of phosphorus pentoxide and nitrogen content and polymerization degree in ammonium polyphosphate were studied.The optimum conditions for the microwave heating of ammonium polyphosphate were as follows: the amount-of-substance ratio of ammonium dihydrogen phosphate to urea was 1:1.1,the reaction temperature was 170 ℃ and the reaction time was 20 min.The sample was I-type polyphosphate detected by XRD.Under the optimal conditions,the yield of prepared phosphorus pentoxide was 70.33%,the mass fraction of nitrogen was 14.34% and the polymerization degree was 50.33.This index met the first grade of chemical industry standard HG/T 2770—2008.

Key words: microwave heating, ammonium polyphosphate, urea, ammonium dihydrogen phosphate

CLC Number:

TQ126.35

Yan Bo,Xie Tian,Zhu Huacheng,Yang Fengming,Wang Fengxia,Chen Yong. Study on process of synthesizing ammonium polyphosphate by microwave heating[J]. Inorganic Chemicals Industry, 2020, 52(7): 42-45.

Figures/Tables 6

References 12

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项目			w（P₂O₅）/ %	w（N）/ %	平均聚合度		粒度w（≤45 μm 粒子）/%	D₅₀/ μm	溶解度/ g	w（水分）/ %	表观密度/ （g·mL^-1）
指标	Ⅰ类	一等品	≥69.0	≥14.0	≥50	5.0~7.0	≥90	—	—	—	—
	Ⅰ类	合格品	≥68.0	≥13.0	≥30	5.0~7.0	≥90	—	—	—	—
	Ⅱ类		≥71.0	≥14.0	≥1 000	5.5~7.5	—	≤20	≤0.5	≤0.25	0.5~0.7

n（磷酸二氢铵）: n（尿素）	平均聚合度	w（P₂O₅）/ %	w（N）/ %
1:0.7	22.34	69.28	13.98
1:0.9	21.32	68.43	14.31
1:1.1	28.08	68.05	14.88
1:1.3	29.50	64.16	16.64
1:1.5	20.90	60.44	18.39

聚合温度/℃	平均聚合度	w（P₂O₅）/%	w（N）/%
140	18.22	66.44	15.07
150	20.00	66.14	15.50
160	28.08	68.05	14.88
170	30.12	68.69	14.89
180	25.31	68.38	14.70
190	26.67	69.46	14.40
200	25.28	70.51	13.94

聚合时间/min	平均聚合度	w（P₂O₅）/%	w（N）/%
3	12.82	60.44	16.12
5	20.57	68.20	14.40
10	30.12	68.69	14.89
15	40.62	70.38	14.23
20	50.33	70.33	14.34
30	44.64	70.45	14.21
40	46.68	70.39	14.25
60	49.65	70.65	14.16

验证次数	平均聚合度	w（P₂O₅）/%	w（N）/%
1	51.62	70.34	14.36
2	45.98	70.11	14.24
3	49.10	70.66	14.22
4	50.90	70.26	14.44

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on process of synthesizing ammonium polyphosphate by microwave heating

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