摘要：

开发了一种新型萃取剂乙酸辛酯，并提出酸化萃取—脱酸脱氨—溶剂回收的煤气化废水处理新工艺。研究发现：降低萃取pH可大大提升溶剂的脱酚效率。该工艺用从脱酸脱氨塔采出的CO₂酸化废水，将pH降至8左右，废水总酚质量浓度降至200 mg/L；酸化萃取后的废水送入单塔加压汽提侧线脱氨单元。在溶剂回收单元中，该工艺利用碱反萃来回收萃取相中的溶剂。该流程具有较高的脱酚效率，能耗低且粗氨产品中的酚质量浓度低，工业应用前景较好。

关键词: 乙酸辛酯, 煤气化废水, 酚氨回收

Abstract:

A novel extraction solvent was developed and a new phenols recovery process was established, which consisted of acidified extraction, removal of acid and ammonia and solvent recovery. It found that the removal efficiencies of phenols were greatly affected by pH of coal gasification wastewater and the removal efficiencies of phenols could be increased greatly by reducing pH. The pH could be reduced to about 8 after acidification by acidic gas from stripper and the concentration of total phenol was reduced to 200 mg/L. The acidified and extracted wastewater was sent to a single column pressurized stripping side line deamination unit. In a solvent recovery unit, the process utilized alkali stripping to recover the solvent in the extract phase. The new phenols recovery process had high removal efficiency of phenol and consumed less energy. In addition, the concentration of phenol was lower in crude ammonia product, and it has good industrial application prospects.

Key words: octyl acetate, coal gasification wastewater, phenols and ammonia recovery

中图分类号: 

• X703.1

• X784