Purification of nitro T acid raffinate by nanofiltration membrane technology

doi:10.11949/j.issn.0438-1157.20160076

Abstract

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

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

CLC Number:

TQ028.8

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.

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.

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