Method for treating washing liquid in vat olive green T-T imine condensation section

Abstract

The invention discloses a method for treating a washing solution in a vat olive green T-T imine condensation section, which comprises the following steps of: a mixture in a sulfuric acid adjusting tank is added into a first-stage elutriation leaching tank, and deionized water is added into a last-stage elutriation leaching tank; a mixture leached and elutriated by each stage of elutriation leaching tank is filtered and separated, liquid serves as leaching and elutriation leaching liquid of the previous stage, and solid enters leaching and elutriation of the next stage; wherein the liquid filtered and separated by the first-stage elutriation and leaching tank enters the settling tank, and the solid filtered and separated by the last-stage elutriation and leaching tank enters the next working section; and a settling reaction is carried out in the settling tank, copper sulfate in a liquid state filtered and separated by the first-stage elutriation leaching tank is converted into copper hydroxide precipitate, filtering separation is carried out, sodium bromide and sodium sulfate are extracted from the liquid state through evaporation and concentration, and copper hydroxide is converted into copper oxide through solid state heating decomposition. The recyclable catalyst copper oxide and the side reaction product sodium bromide are recycled, the washing water is recycled, the production cost is reduced, and zero emission of the T-imine condensation section is achieved.

Description

technical field [0001] The invention relates to a treatment method for washing liquid in the reduction olive green T-T imine condensation section, which is used for copper ion dilution, washing to remove copper ions, recovery of copper ions and recovery treatment of by-product sodium bromide in the olive green T-T imine condensation section. Background technique [0002] Anthraquinone-based vat dyes have a long history. A new report released by a global industry analysis company shows that by 2012, the world's textile dye market demand will rapidly expand to 760,000 tons, worth 5.7 billion US dollars. [0003] Textile dyes have become a specialty chemical industry. From 1995 to 2005, the market value of textile dyes only increased by 2%, and the market size increased by 2.3%. In the next five years, the expected growth rate of the market value is 4.3%, and the expected growth rate of the market size is 4.6%. Vat dyes are the leading product, accounting for 24% of the sales...

AI Technical Summary

Problems solved by technology

[0020] Due to the large amount of washing water, a large amount of reduced olive green T enters the production wastewater, the yield of reduced olive green T decreases, a large amount of copper ions are precipitated with sodium hydroxide, the waste of raw materials is serious, and the production cost remains high.

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