CIESC Journal ›› 2018, Vol. 69 ›› Issue (9): 4012-4018.DOI: 10.11949/j.issn.0438-1157.20180228

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Reaction and regeneration behavior of melamine with SO2

HU Xiaowei, LÜ Li, LIANG Bin, QIU Liyou, YUAN Shaojun, ZHENG Dongyao   

  1. School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China
  • Received:2018-03-05 Revised:2018-04-29 Online:2018-09-05 Published:2018-09-05
  • Supported by:

    supported by the Sichuan Science and Technology Plan Project (2017GZ0377).

三聚氰胺与SO2反应及再生行为

胡晓伟, 吕莉, 梁斌, 邱礼有, 袁绍军, 郑东钥   

  1. 四川大学化学工程学院, 四川 成都 610065
  • 通讯作者: 吕莉
  • 基金资助:

    四川省科技计划项目(2017GZ0377)。

Abstract:

The reaction and regeneration behavior of melamine (MN), a kind of solid organic amine, with SO2 was studied. The results show that MN desulfurization rate is above 99% for 140 min at simulated flue gas:0.35%SO2+ 5%O2 + N2, 40℃ and 4% MN (mass fraction). Meanwhile, the breakthrough sulfur capacity (200 mg/m3 SO2 in outlet flue gas) is 0.33g SO2/(g MN). The analysis of MN desulfurization and regeneration products by XRD, FTIR, SEM and TG-MS shows that MN reacts with SO2 to produce melamine sulfite firstly, and then melamine sulfite is oxidized to melamine sulfate partly by oxygen in the flue gas. Adding 0.1% p-diphenylamine can effectively inhibit the melamine sulfite to be oxidized. Melamine sulfite can be heated and regenerated in 75-150℃, but the melamine sulfate cannot be regenerated by heating. The oxidation rate of melamine sulfite decreased from 36% at 5%O2 to 13% at 5%O2+ 0.1% p-diphenylamine. When products were heated at 150℃ for 2 h desulfurization, the regeneration rate of melamine increased from 58% at 5%O2 to 94% at 5%O2+ 0.1% p-diphenylamine. MN has excellent desulfurization and regeneration performance in the anti-oxidation mode.

Key words: flue gas desulfurization, organic amine, melamine, oxidation, regeneration

摘要:

以固体有机胺三聚氰胺(MN)为脱硫剂,对MN与SO2反应及再生行为进行研究。结果表明,烟气组成0.35% SO2+5% O2+N2,40℃、4% MN(质量分数)条件下,MN可维持140 min脱硫率>99%,穿透硫容(出口SO2浓度200 mg/m3)0.33 g SO2/(g MN)。MN脱硫及再生产物XRD、FTIR、SEM及TG-MS等表征分析表明,MN与SO2反应首先生成三聚氰胺亚硫酸盐,随后被烟气中的氧气氧化为三聚氰胺硫酸盐,加入0.1%对苯二胺可有效抑制三聚氰胺亚硫酸盐氧化;三聚氰胺亚硫酸盐在75~150℃可加热再生,三聚氰胺硫酸盐不能加热再生。烟气含5% O2条件下,加入0.1%对苯二胺,三聚氰胺亚硫酸盐氧化率由36%降低至13%,150℃下再生2 h,再生率由58%提高至94%,MN抗氧二次脱硫性能优良。

关键词: 烟气脱硫, 有机胺, 三聚氰胺, 氧化, 再生

CLC Number: