Spray absorber type carbonization reaction device for alkali balance in indigo production

Abstract

The invention relates to a spray absorber type carbonization reaction device for alkali balance in indigo production. The device comprises a tower body, an upper head, a sprayer, a conical head, a bottom discharge pipe, a circulating suction pipe, a circulating pipe, a circulating pump and a liquid inlet pipe, wherein the sprayer is arranged in the upper head; an air inlet higher than the sprayer is formed in the upper head; the upper head is encapsulated at the top end of the tower body; the conical head is encapsulated in the bottom end of the tower body in an inverted conical shape; the lower opening of the bottom discharge pipe corresponds to the inverted-cone shaped lower part of the conical head, and the upper opening of the bottom discharge pipe from the inner side of the tower body penetrates through the lateral wall of the tower body higher than the upper inverted-cone shaped conical head; the circulating suction pipe is connected to the tower body higher than the upper opening of the bottom discharge pipe in a penetrating manner, and is communicated with the inner side of the tower body; the circulating suction pipe and the liquid inlet pipe are connected with the circulating pump; the circulating pump is communicated with the sprayer through the circulating pipe. The tower body adopting the hollow tower structure sprays mixed alkali liquor mist to react with CO2, so that the ratio of potassium to sodium in the alkali system can be adjusted, and the Na2CO3 crystal can be reclaimed.

Description

technical field [0001] The invention relates to a spray absorption tower type reaction device, in particular to a spray absorption tower type carbonization reaction device for alkali balance in indigo production. Background technique [0002] The current industrial synthesis process of indigo is: potassium aniline acetate / sodium salt and sodium amide undergo an alkali fusion reaction in a system in which a mixed alkali of KOH and NaOH is used as a solvent to generate potassium / sodium indoxylate, ammonia gas and sodium hydroxide. The alkali melt is diluted with water, oxidized by air, and indigo is obtained after pressure filtration, and the mother liquor after pressure filtration is a mixed alkali solution of KOH and NaOH containing 12% alkali. [0003] During the alkali fusion reaction, the mixed base K:Na=1:1 of KOH and NaOH, since the sodium in the sodium amide is converted into NaOH during the reaction, the potassium-sodium ratio in the mother liquor is 0.6:1, and the so...

AI Technical Summary

Problems solved by technology

The existing method is: adding potassium hydroxide to the mixed alkali to adjust the ratio of potassium to sodium, which results in a surplus of mixed alkali, and part of the excess alkali is carbonized in the subsequent oxidation section to become sodium carbonate alkali slag, which is used as a solid waste; part of the excess alkali is lost with the washing water of indigo, and the dilute alkali in the washing water is neutralized by sulfuric acid to become salt and finally waste water, which not only pollutes the environment, but also causes the loss of potassium and wastes potassium resources

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