磷酸法木质活性炭除灰新工艺研究

doi:10.3969/j.issn.1673-5854.2020.04.006

Abstract

Abstract:

The solubilities in acid and water of the polyphosphate obtained from phosphate at different temperatures were determined. The results showed that the solubility of polymeric phosphate decreased with the temperature increase; as the preparation temperature increased from 350℃ to 650℃, the water solubility and acid solubility decreased from 98.71% and 98.93% to 73.12% and 74.80%, respectively. Compared with the conventional water elution process, the effects of acid pickling, heating, oxidant HClO and centrifugal process on the ash content and the adsorption capacity of commercial phosphate-activated carbon were studied. The specific surface area of activated carbon were determined. The results showed that the ash content of activated carbon reduced from 6.24% to 1.49% when the samples were washed twice by HCl and oxidant HClO and then washed three times by water in 80℃ with centrifugal dehydration process compared the sample of water washing. And the specific surface area, pore diameter, pore volume, iodine adsorption value, methylene blue adsorption value and caramel decolorization were 1 503 m²/g, 3.656 nm, 1.361 cm³/g, 975 mg/g, 277.5 mg/g, 110%, which were larger than those of the water washed sample. Therefore, low-ash phosphate-activated carbon could be prepared at low temperature and by using the above demineralization process.

Key words: activated carbon, phosphate, polyphosphate, ash, centrifugation

CLC Number:

TQ35

Ruting XU,Wei XU,Xincheng LU,Kang SUN. Novel Demineralization Technology of Phosphate-activated Carbon[J]. Biomass Chemical Engineering, 2020, 54(4): 37-41.

Figures/Tables 5

Table 1

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References 15

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温度/℃ temperature	聚合磷酸/g polyphosphate	酸不溶物/g acid insoluble ash	酸溶解度/% acid solubility	水不溶物/g water insoluble ash	水溶解度/% water solubility
350	3.7782	0.0406	98.93	0.0489	98.71
400	3.6645	0.0561	98.47	0.0602	98.36
450	3.5286	0.0748	97.88	0.0784	97.78
500	3.5192	0.0763	97.83	0.0901	97.44
550	3.5089	0.0777	97.79	0.0927	97.36
600	1.9587	0.4154	78.79	0.4308	78.01
650	1.7876	0.4505	74.80	0.4805	73.12

介质 medium	洗涤温度/℃ washing temperature	脱水方式 dehydration mode	灰分/% ash
H₂O	25	抽滤filtration	6.24
HCl	25	抽滤filtration	5.23
HCl	60	抽滤filtration	4.35
HCl	80	抽滤filtration	3.21
HCl	100	抽滤filtration	3.19
HCl	80	离心(3000 r/min)centrifugation	3.06
HCl	80	离心(5000 r/min)centrifugation	2.93
HCl	80	离心(7000 r/min)centrifugation	2.75
HCl	80	离心(10000 r/min)centrifugation	2.31
HCl-HClO	80	离心(10000 r/min)centrifugation	1.49

介质 medium	洗涤温度/℃ washing temperature	脱水方式 dehydration mode	比表面积/(m²·g^-1) specific surface area	孔径/nm pore diameter	孔容积/(cm³·g^-1) pore volume
H₂O	25	抽滤filtration	1301	3.520	1.163
HCl	80	离心(10000 r/min)centrifugation	1491	3.656	1.354
HCl-HClO	80	离心(10000 r/min)centrifugation	1503	3.656	1.361

介质medium	洗涤温度/℃ washing temperature	脱水方式dehydration mode	碘吸附值/(mg·g^-1) iodine number	亚甲基蓝吸附值/(mg·g^-1) methylene blue adsorption	焦糖脱色率/% caramel decolorization
H₂O	25	抽滤filtration	929	262.5	105
HCl	25	抽滤filtration	955	270	105
HCl	80	抽滤filtration	969	270	110
HCl	80	离心(10000 r/min) centrifugation	968	270	110
HCl-HClO	80	离心(10000 r/min) centrifugation	975	277.5	110

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Novel Demineralization Technology of Phosphate-activated Carbon

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