Purification of nitro T acid raffinate by nanofiltration membrane technology

SHI Hu; LU Jianming; CHEN Zhong; LIN Xiao

doi:10.11949/j.issn.0438-1157.20160076

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Purification of nitro T acid raffinate by nanofiltration membrane technology

更新时间：2025-11-26

- Purification of nitro T acid raffinate by nanofiltration membrane technology
- CIESC Journal Issue 7, Pages: 2887-2892(2016)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160076
  CLC： Q028.8
- Online First：05 July 2016，
  
  Published：05 July 2016
- 稿件说明：
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SHI Hu, LU Jianming, CHEN Zhong, et al. Purification of nitro T acid raffinate by nanofiltration membrane technology[J]. CIESC Journal, 2016, (7): 2887-2892.
DOI：

SHI Hu, LU Jianming, CHEN Zhong, et al. Purification of nitro T acid raffinate by nanofiltration membrane technology[J]. CIESC Journal, 2016, (7): 2887-2892. DOI： 10.11949/j.issn.0438-1157.20160076.

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，CODCr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，CODCr总去除率为94%~97%，总色度去除率99%。大幅降低污染物排放量。

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 N235 volume fraction of 33%

water over oil ratio of 2:1 without addition of n-octanol. After secondary extraction

the removal rate of CODCr 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 CODCr and chroma were 94%—97% and 99%

respectively. This coupling method could greatly reduce the pollutant emissions in production of nitro T acid.

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