Method for recycling mixed alkali liquor in indigo production
A technology of mixing alkali and indigo, which is applied in the direction of organic dyes and carbonate preparations, can solve the problems of high processing and production costs, difficult biochemical treatment of inorganic salts, waste of alkali resources, etc., to prevent waste of potassium resources and save recycling Process, water saving effect
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[0014] The present invention will be further described below.
[0015] A method for producing and recovering mixed lye from indigo includes the following steps:
[0016] (1) After the indigo oxidation process, it is sent to the filter press for pressure filtration, the press filter filtrate is concentrated and filtered to obtain the alkali residue, and the press filter concentrate is sent to the reactor;
[0017] (2) Washing step (1) After pressing and filtering the indigo, add the alkali residue in step (1) to the washing water, increase the temperature and stir until the alkali residue is completely dissolved, and then naturally cool to room temperature for filtration. The filtrate is concentrated into a concentrated alkali solution and sent to the reaction Kettle; filter residue adopts saturated Na 2 CO 3 Na is filtered after washing 2 CO 3 Solid, the filtrate is concentrated into concentrated lye and sent to the reactor;
[0018] (3) Pass CO into the reactor 2 When the reaction te...
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