摘要
详细研究了使用磷酸处理碱法三角黄草黑液工艺过程及影响因素,得到提取木质素的适宜条件：pH值为2.5左右,保温温度55℃,保温时间20-30min,加酸速度以不产生泡沫为准,可使得黑液的色度大大降低,COD去除率达69.1%,而且具有较高附加值的磷酸副产物可进一步加以利用,对黑液的工业化处理提供了一个方法。
Compared with the traditional process of extracting lignin,the phosphoric acid process was studied in detail from the triangle yellow grass black liquor.The optional technical conditions had been got as followed： pH=2.5,T=55℃,t=20～30min.Moreover,during the experiment,acid was added with a middle speed and no froths produced.Under the above conditions,the removal rate of the chromaticity was great,and the removal rate of the COD reached 69.1%.In addition,the phosphatic by-products could be further use,what had higher added-value.
出处
《化工技术与开发》
CAS
2010年第7期41-43,共3页
Technology & Development of Chemical Industry
关键词
磷酸
三角黄草黑液
环境治理
phosphoric acid
the triangle yellow grass black liquor
environmental control
