Unlock instant, AI-driven research and patent intelligence for your innovation.

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

A technology of mixing alkali residues and extraction methods, applied in carbonate preparations, purification/separation of amino compounds, organic chemistry, etc., can solve the problems of carcinogenic substances flowing into rivers, untreated organic substances, environmental pollution, etc., to achieve favorable environmental protection, The effect of low cost and simple extraction method

Inactive Publication Date: 2011-04-13
重庆达华砼外加剂科技发展有限公司
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The following example further illustrates the invention.

[0013] In the production of indigo, 1 ton of the 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. At 300°C, the mixed alkali slag contains organic aniline groups. Acetonitrile and potassium sodium anilinoacetate, carbonized to break the chain of organic matter, forming aniline vapor and water vapor, dry mixed alkali, aniline vapor and water vapor are introduced into the condensation tower under the action of negative pressure to condense, the condensation temperature is 40 ℃, after natural Dissolution forms an aniline layer under the upper water layer, extracts the aniline and puts it into the reaction kettle to produce sodium p-aminobenzenesulfonate, and forms dry mixed alkali without organic matter after calcination, puts it into the stirring and dissolving kettle, and adds water at the same time, dry mixed a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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