Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas

›› 2008, Vol. 16 ›› Issue (3): 461-464.

Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas

赵舜华¹, 宋锡瑾², 裴宁², 张景铸³, 刘书庆³

1. Zhejiang Hexin Industry Group Co., Jiaxing 314003, China;
2. Department of Chemical&Biochemical Engineering, Zhejiang University, Hangzhou 310027, China;
3. Yantai Dongjie Environmental Protection Machine Engineering Co., Yantai 264002, China

收稿日期:2007-09-22 修回日期:2008-03-25 出版日期:2008-06-28 发布日期:2008-06-28
通讯作者: SONG Xijin,E-mail:xjsong@zju.edu.cn
基金资助:
the Science and Technology Fund of Zhejiang Province, China (2006C13072)

Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas

ZHAO Shunhua¹, SONG Xijin², PEI Ning², ZHANG Jingzhu³, LIU Shuqing³

1. Zhejiang Hexin Industry Group Co., Jiaxing 314003, China;
2. Department of Chemical&Biochemical Engineering, Zhejiang University, Hangzhou 310027, China;
3. Yantai Dongjie Environmental Protection Machine Engineering Co., Yantai 264002, China

Received:2007-09-22 Revised:2008-03-25 Online:2008-06-28 Published:2008-06-28
Supported by:
the Science and Technology Fund of Zhejiang Province, China (2006C13072)

摘要/Abstract

摘要： A new recovery technology is developed to recycle N,N-dimethyl formamide(DMF)in waste gas from wet type polyurethane synthetic leather industry.Given that the concentration of DMF in waste gas was as low as 325.6-688.3 mg·m^-3,it was necessary to make sure two phases contact adequately and strengthen the mass transfer by increasing contact area and enhancing the turbulence.Therefore,two-stage countercurrent absorption and two-stage fog removing system were introduced into the technology.The top section of the absorption column was filled with structured wire-ripple stainless steel packing BX500,while the lower section with sting-ripple packing CB250Y.Total height of packing material was 6 m.In addition,there were both two-stage fog removing layer and high efficiency liquid distributor at the column top.All the operating parameters,including temperature,pressure, flow rate and liquid position,could be controlled by computers without manual operation,making sure the outlet gas achieved the national emission standard that the DMF concentration should be below 40 mg·m^-3.The whole equipment could recover 237.6 t of DMF each year,with the profit up to CNY 521×10³.

关键词: N,N-dimethylformamide, polyurethane synthetic leather, absorption, recovery

Abstract: A new recovery technology is developed to recycle N,N-dimethyl formamide(DMF)in waste gas from wet type polyurethane synthetic leather industry.Given that the concentration of DMF in waste gas was as low as 325.6-688.3 mg·m^-3,it was necessary to make sure two phases contact adequately and strengthen the mass transfer by increasing contact area and enhancing the turbulence.Therefore,two-stage countercurrent absorption and two-stage fog removing system were introduced into the technology.The top section of the absorption column was filled with structured wire-ripple stainless steel packing BX500,while the lower section with sting-ripple packing CB250Y.Total height of packing material was 6 m.In addition,there were both two-stage fog removing layer and high efficiency liquid distributor at the column top.All the operating parameters,including temperature,pressure, flow rate and liquid position,could be controlled by computers without manual operation,making sure the outlet gas achieved the national emission standard that the DMF concentration should be below 40 mg·m^-3.The whole equipment could recover 237.6 t of DMF each year,with the profit up to CNY 521×10³.

Key words: N,N-dimethylformamide, polyurethane synthetic leather, absorption, recovery

赵舜华, 宋锡瑾, 裴宁, 张景铸, 刘书庆. Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas[J]. , 2008, 16(3): 461-464.

ZHAO Shunhua, SONG Xijin, PEI Ning, ZHANG Jingzhu, LIU Shuqing. Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas[J]. , 2008, 16(3): 461-464.

参考文献

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12 Castillo, J.R.O., Guerrero-Medina, G., Lopez-Toled, J., Rocha, J.A., “Design of steam-stripping columns for removal of volatile organic compounds from water using random and structured packings”, Ind. Eng. Chem. Res., 39(3), 731-739(2000).
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Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas

Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas

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