麦草氨法制浆工艺及动力学

CIESC Journal

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麦草氨法制浆工艺及动力学

黄国林^a; 张成芳^b; 陈中胜^a

^a Department of Chemical Engineering, East China Institute of Technology, Jiangxi 344000,China
^b Institute of Chemical Technology, East China University of Science and Technology, Shanghai 200237, China

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-12-28 发布日期:2006-12-28
通讯作者: 黄国林

Pulping of wheat straw with caustic potashammonia aqueous solutions and its kinetics

HUANG Guolin^a; ZHANG Chengfang^b; CHEN Zhongsheng^a

^a Department of Chemical Engineering, East China Institute of Technology, Jiangxi 344000,China
^b Institute of Chemical Technology, East China University of Science and Technology, Shanghai 200237, China

Received:1900-01-01 Revised:1900-01-01 Online:2006-12-28 Published:2006-12-28
Contact: HUANG Guolin

摘要/Abstract

摘要： A pulping technology of wheat straw with aqueous ammonia and diluent caustic potash was investigated. Because its strong alkalinity, the addition of caustic potash not only reduced the quantity of NH3 consumed and cooking time, but also enriched the black liquor with nutrients such as potassium and nitrogen, which could be used as fertilizer for agriculture. Various pulping conditions including composition of cooking liquor, liquor-to-solid ratio, maximum cooking temperature, time to reach the maximum temperature and time at the maximum temperature were studied systematically to determine the suitable pulping conditions. Results of the cooking course showed that there were three distinct delignification phases, namely, the bulk delignification phase from the beginning of cooking to 100℃, the supplementary delignification phase from 100℃ to 155℃ for 45min and the third delignification phase till the end of cooking. The rate of delignification was found to be first order with respect to residual lignin and 0.34 order with respect to [OH－]. The activation energy of the delignification reaction was 29.75kJ•mol－1 and the rate equation of delignification was also obtained.

关键词: pulping;wheat straw;kinetics;delignification

Abstract: A pulping technology of wheat straw with aqueous ammonia and diluent caustic potash was investigated. Because its strong alkalinity, the addition of caustic potash not only reduced the quantity of NH3 consumed and cooking time, but also enriched the black liquor with nutrients such as potassium and nitrogen, which could be used as fertilizer for agriculture. Various pulping conditions including composition of cooking liquor, liquor-to-solid ratio, maximum cooking temperature, time to reach the maximum temperature and time at the maximum temperature were studied systematically to determine the suitable pulping conditions. Results of the cooking course showed that there were three distinct delignification phases, namely, the bulk delignification phase from the beginning of cooking to 100℃, the supplementary delignification phase from 100℃ to 155℃ for 45min and the third delignification phase till the end of cooking. The rate of delignification was found to be first order with respect to residual lignin and 0.34 order with respect to [OH－]. The activation energy of the delignification reaction was 29.75kJ•mol－1 and the rate equation of delignification was also obtained.

Key words: pulping, wheat straw, kinetics, delignification

黄国林, 张成芳, 陈中胜. 麦草氨法制浆工艺及动力学[J]. CIESC Journal.

HUANG ,Guolin, ZHANG ,Chengfang, CHEN ,Zhongsheng. Pulping of wheat straw with caustic potashammonia aqueous solutions and its kinetics[J]. .

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麦草氨法制浆工艺及动力学

Pulping of wheat straw with caustic potashammonia aqueous solutions and its kinetics

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