有机胺法脱除二氧化硫工艺技术进展

介绍了有机胺法脱除502技术的基本原理、工艺流程及国内外技术发展情况。重点论述了近年来国内在胺法脱除S02溶剂配方方面的研究进展。分析和探讨了该法在国内应用中存在的系统腐蚀、堵塞及胺液损耗等问题。开发高脱硫效率胺类离子液体配方(耐硫酸腐蚀、黏度低、吸收能力强、解吸效率高、化学结构和热稳定性好且溶剂绿色环保)、高传质效率脱硫设备,以及优化脱硫工艺流程,以达到环境友好、提高效率、节约成本和降低能耗,是未来有机胺法脱除二氧化硫技术的主要发展方向。

干姜及其提取物中二氧化硫的研究现状及展望

食品中的二氧化硫残留指标是国家质检部门的严控指标之一，在生姜干燥过程中，人为及非人为因素均导致干姜中二氧化硫残留。就我国干姜中二氧化硫的残留量、来源、存在形态及危害、国内外相关限量标准、检测法及脱除方法等5方面问题，综合阐述前人的研究成果；结合对干姜提取物的脱硫技术的研究，提出以下结论：对于干姜中二氧化硫，我国食品国标中相应限量为200 mg/kg；作为中药材，中国药典的限量为150 mg/kg；国外的限量则为30~50 mg/kg。对于如此巨大的限量差异，目前国内外市场都选择了更为安全的国外标准，这呼唤着新型脱硫技术及新限量标准来保障国人的食品安全。目前尚无一套完善的脱除食品中二氧化硫的方法。未来食用植物（如干姜）中脱除二氧化硫的技术将充分考虑保存食品本身的风味与品质，根据不同对象研究具有针对性、可控性并且经济便捷的技术，来保障食品安全。研究的干姜提取物的脱硫技术，兼顾了风味成分的保留、传统干燥技术的保留及二氧化硫约80%的脱除率。

蓄电池级硫酸制取工艺技术研究

利用某冶炼厂98%的浓硫酸为原料,原料中杂质含量较低,通过脱除硫酸中残留的二氧化硫和过滤净化的方法制取的蓄电池级硫酸产品达到化工部标准HG/T2692-2007指标要求。

High-efficiency removal of NOx by a novel integrated chemical absorption and two-stage bioreduction process using magnetically stabilized fluidized bed reactors

To enhance the bioregeneration of Fe(II)EDTA and to avoid the inhibition of the components in nitrogen oxides(NOx) scrubbing solution, a novel integrated process of metal chelate absorption and two-stage bioreduction was developed. In this process, magnetically stabilized fluidized beds(MSFB) were used as the bioreactors, and the phase diagram for the MSFB operation was determined. Factors including inlet NO, O2 and SO2 concentrations, magnetic field intensity, gas flow rate and liquid circulation rate, were studied experimentally to investigate their effects on NO removal. In addition, a mathematical model for NO removal in this integrated system was developed. The results revealed that the integrated system could be steadily operated with a high NO removal efficiency and elimination capacity, even under the condition of high NO and O2 shock-loading. The established model showed that NO removal efficiency was related to the spray column property and the active Fe(II)EDTA concentration, while the latter depends on the bioregeneration of the disabled absorbent in the MSFB.