硝基T酸萃余硫酸溶液纳滤膜法净化技术

doi:10.11949/j.issn.0438-1157.20160076

化工学报 ›› 2016, Vol. 67 ›› Issue (7): 2887-2892.DOI: 10.11949/j.issn.0438-1157.20160076

硝基T酸萃余硫酸溶液纳滤膜法净化技术

石浒¹, 陆剑鸣², 陈忠², 林晓¹

1. 南京工业大学化工学院, 材料化学工程国家重点实验室, 江苏南京 210009;
2. 圣卡孚科技有限公司, 江苏南京 210032

收稿日期:2016-01-18 修回日期:2016-03-03 出版日期:2016-07-05 发布日期:2016-07-05
通讯作者: 林晓
基金资助:
江苏高校优势学科建设工程资助项目。

Purification of nitro T acid raffinate by nanofiltration membrane technology

SHI Hu¹, LU Jianming², CHEN Zhong², LIN Xiao¹

1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China;
2. Saint Recovery Technology Co., Ltd., Nanjing 210032, Jiangsu, China

Received:2016-01-18 Revised:2016-03-03 Online:2016-07-05 Published:2016-07-05
Supported by:
supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要/Abstract

摘要：

H酸的中间体硝基T酸生产中产生大量废酸，通过叔胺类萃取剂N₂₃₅处理该废酸，再采用纳滤膜脱除萃余液中残留萃取剂及可溶性萘系磺化物。适宜的纳滤前处理萃取条件：在萃取油相中不添加正辛醇；N₂₃₅体积分数为33%，W/O（水油比）为2：1。经过二级萃取后，COD_Cr去除率为79%。二级萃余液采用纳滤膜浓缩至1/6体积，平均通量可达9.9~20.9 L·m^-2·h^-1，纳滤后可回收27%浓度的硫酸，COD_Cr总去除率为94%~97%，总色度去除率99%。大幅降低污染物排放量。

关键词: H酸, 硝基T酸, 络合萃取, 纳滤, 硫酸净化

Abstract:

Production of nitro T acid which is an intermediate of H acid produces a large amount of waste acid. In this paper, the complex extraction coupled with nanofiltration membrane using trialkylamine (N₂₃₅) as extracting agent was adopted to purify this waste acid in order to remove the residual extractant and soluble sulfonated naphthalene. The suitable extraction condition for nanofiltration processing was N₂₃₅volume fraction of 33%, water over oil ratio of 2:1 without addition of n-octanol. After secondary extraction, the removal rate of COD_Cr was 79%. When the secondary raffinates were concentrated to one sixth of the volume by nanofiltration, the average fluxes of the membranes were 9.9—20.9 L·m^-2·h^-1. Sulfuric acid with 27% concentration (mass fraction) was recovered. The total removal rates of COD_Cr and chroma were 94%—97% and 99%, respectively. This coupling method could greatly reduce the pollutant emissions in production of nitro T acid.

Key words: H acid, nitro T acid, complex extraction, nanofiltration, sulfuric acid purification

中图分类号:

TQ028.8

石浒, 陆剑鸣, 陈忠, 林晓. 硝基T酸萃余硫酸溶液纳滤膜法净化技术[J]. 化工学报, 2016, 67(7): 2887-2892.

SHI Hu, LU Jianming, CHEN Zhong, LIN Xiao. Purification of nitro T acid raffinate by nanofiltration membrane technology[J]. CIESC Journal, 2016, 67(7): 2887-2892.

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硝基T酸萃余硫酸溶液纳滤膜法净化技术

Purification of nitro T acid raffinate by nanofiltration membrane technology

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