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Mixed alkaline residue treatment method during indigo production

A technology of mixing alkali slag and mixed alkali, which is applied in the direction of chemical instruments and methods, alkali metal carbonates, alkali metal compounds, etc., can solve the problems of secondary pollution, potassium resources without effective utilization of potassium, etc., and achieve low investment Effect

Inactive Publication Date: 2015-07-08
INNER MONGOLIA TAIXING TAIFENG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali carried in the alkali slag is lost with the alkali slag. Now about 1000kg of alkali slag rich in potassium hydroxide produced per ton of indigo can only be sold to paper mills at a low price. The precious potassium resource is not effectively utilized by potassium. bring secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Ethanol extraction of organic matter in carbonized liquid

[0022] Take 20g of carbonization solution, including 0.47g of anthranilic acid and 0.17g of phenylaminoacetic acid, add 3g of ethanol, shake for 2 minutes and then let stand for 30 minutes to separate layers. The mass of the upper layer is 5.32g, of which 0.45g is anthranilic acid, 0.16g is phenylaminoacetic acid, and 2.58g is ethanol. The mass of the lower layer is 17.47g, of which 0.02g is anthranilic acid, 0.01g is phenylaminoacetic acid, and 0.14g is ethanol. The extraction rate of organic matter reaches more than 95%.

Embodiment 2

[0023] Example 2 Methanol extraction of organic matter in carbonized liquid

[0024] Take 20g of carbonization solution, including 0.47g of anthranilic acid and 0.17g of phenylaminoacetic acid, add 3g of methanol, shake for 2 minutes and then stand for 2 hours, the mixture cannot be separated.

Embodiment 3

[0025] Example 3 Isopropanol extraction of organic matter in carbonized liquid

[0026] Take 20g of carbonization solution, including 0.47g of anthranilic acid and 0.17g of phenylaminoacetic acid, add 3.04g of isopropanol, shake for 2 minutes and then let it stand for 30 minutes to separate layers. The mass of the upper layer is 6.13g, of which 0.40g is for anthranilic acid, 0.16g is for phenylaminoacetic acid, and 3.03g is for isopropanol. The mass of the lower layer is 16.93g, of which 0.07g is anthranilic acid, 0.01g is phenylaminoacetic acid, and 0.05g is isopropanol. The extraction rate of organic matter reached 87.5%.

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PUM

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Abstract

The invention relates to a mixed alkaline residue treatment method during indigo production, first alkaline residue solid waste which is rich in sodium carbonate and organic impurities and carries 20-30% of NaOH and KOH mixed alkaline is added into a reactor, wherein the alkaline residue solid waste is precipitated during the process of concentration of indigo oxidation filter pressing mother liquor, proper amount of water is added, after stirring even, carbon dioxide is introduced until hydroxy radicals are completely neutralized, by one-time centrifugal separation, sodium carbonate is separated to use as a byproduct for sell; then filtrate is extracted by an organic solvent for separation of an organic phase and a water phase, most of phenylamino acetate and by-product anthranilate enters the organic phase, the extracted water phase and organic phase are respectively distilled, after distillation, the solvent in the organic phase is recycled to use in the extraction process, the distilled water phase returns to the mixed alkaline concentrated by indigo oxidation filter pressing mother liquor, through ion exchange and secondary centrifugation separation, solid sodium carbonate is separated, and the separation mother liquor returns to the indigo production alkali balance system.

Description

technical field [0001] The invention belongs to the technical field of the treatment and recycling of alkali slag waste produced in the recovery process of KOH and NaOH mixed alkali in the production of vat dye indigo. Background technique [0002] Indigo is a vat dye with a long history. Humans began to dye linen with natural indigo more than 4,000 years ago. Since the German chemist Bayer successfully synthesized indigo in 1880, indigo has been enduring and has been widely used in the dyeing of cotton, linen and other fabrics, especially denim. [0003] The traditional indigo synthesis process is as follows: Potassium / sodium aniline acetate and sodium amide react with sodium amide in a system in which the mixed base of KOH and NaOH is the solvent and further condense to form potassium / sodium indoxylate, ammonia gas and sodium hydroxide . After the alkali fusion condensate is dissolved in water, it is oxidized by air, and the indigo is obtained after pressure filtration a...

Claims

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Application Information

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IPC IPC(8): C07D209/36C01D7/00C01D7/07
Inventor 尹应武毛永生吴德生李留德崔建斌孙响响栾敏红
Owner INNER MONGOLIA TAIXING TAIFENG CHEM