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Method for extracting aniline and sodium carbonate and potassium carbonate from mixed alkaline residue in bipseudoindoxyl production

A technology of mixed alkali residue and extraction method, which is applied in the fields of carbonate preparation, purification/separation of amino compounds, organic chemistry, etc., and can solve the problems of carcinogens flowing into rivers, untreated organic matter, secondary pollution, etc., and achieve favorable environmental protection , low cost and easy purchase of equipment

Inactive Publication Date: 2008-12-17
重庆达华砼外加剂科技发展有限公司
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AI Technical Summary

Problems solved by technology

The current indigo enterprises discharge the mixed alkali slag after simple acid-base neutralization treatment. The organic matter is not treated, causing serious environmental pollution, and a large amount of carcinogens flow into rivers; the paper industry uses it, causing secondary pollution; direct discharge or landfill causing secondary pollution

Method used

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Embodiment Construction

[0012] The following example further illustrates the invention.

[0013] In the production of indigo, 1 ton of mixed alkali slag produced is put into a self-made alkali boiling steamer for calcination. The calcination temperature is 300°C and the time is 3 hours. The organic matter is carbonized at a high temperature to break the chain of the organic matter and form aniline vapor. And water vapor, dry mixed alkali, aniline vapor and water vapor are introduced into the condensation tower to condense under negative pressure. The condensation temperature is 40°C. After natural dissolution, there is an aniline layer on the upper layer and the lower layer, and the aniline is pumped into the reactor for production Sodium p-aminobenzenesulfonate is calcined to form dry mixed alkali 50% without organic matter according to the weight ratio, put into the stirring and dissolving kettle, add water 50% at the same time, after stirring and dissolving, enter the 200-mesh filter to filter, rem...

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Abstract

The invention discloses a method for extracting aniline, sodium carbonate and potassium carbonate from mixed caustic sludge in the production of indigo, which relates to a comprehensive treatment technology in the production of indigo. The adopted technical proposal is that the mixed caustic sludge forms aniline vapor and water vapor after calcination, water is on the upper layer and aniline is on the lower layer by natural settling after condensation, aniline is drawn out and put into a reaction kettle to produce sodium sulfanilate, dry mixed alkali produced is dissolved with water and filtrated, and CO2 is introduced for carbonatation treatment so as to produce potassium carbonate and sodium carbonate which are separated out after concentration, and finally the potassium carbonate and the sodium carbonate are dried, calcinated, naturally cooled and packaged. The method of the invention is characterized by simple extraction method, easy purchase of equipment, low cost, realization of cyclic economy, thus being beneficial to 'recycle and reclamation' and environmental protection. The method of the invention is applicable to the comprehensive treatment of indigo production industry.

Description

1. Technical field [0001] The invention relates to a comprehensive treatment technology for waste produced in indigo production, in particular to a method for extracting aniline, sodium carbonate and potassium carbonate by mixing alkali slag in indigo production. 2. Background technology [0002] In the process of indigo production, a certain amount of sodium and potassium salts are added, and KOH, NaOH, Na 2 CO 3 、K 2 CO 3 And organic matter (organic matter is aniline acetonitrile and potassium sodium anilinoacetate) mixed alkali slag, every ton of indigo produced just produces more than one ton of waste mixed alkali slag. The disposal of more than 100,000 tons of waste mixed alkali slag every year in the country has been entangled in the indigo production industry for decades. The current indigo enterprises discharge the mixed alkali slag after simple acid-base neutralization treatment. The organic matter is not treated, causing serious environmental pollution, and a l...

Claims

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Application Information

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IPC IPC(8): C07C211/46C07C209/86C01D7/07
Inventor 蒋德双张樵
Owner 重庆达华砼外加剂科技发展有限公司
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