Recovery, balance adjustment and comprehensive utilization technology for mixing alkali in indigo blue production

A technology of mixing alkali and oxidizing alkali, which is applied in the direction of indigo dyes, organic dyes, chemical instruments and methods, etc., can solve the problems of waste of resources and underutilization of potassium resources, and achieve small investment, strong practicability, and huge benefits Effect

Active Publication Date: 2013-02-13
JIANGSU TAIFENG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the serious imbalance of potassium-sodium ratio in the existing production, the potassium resources are not fully utilized, and the resources are seriously wasted. Therefore, the excess sodium hydroxide in the mixed alkali is separ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Crystallization experiment at 70°C

[0022] Weigh 200.00g of three-effect concentrate (mixed alkali) (K / Na=0.62:1, CO 3 2- =15.54g / L, alkalinity (mixed alkali) =692.41g / L), pass 15.00g CO into the mixed alkali 2 , There is white Na immediately 2 CO 3 Is generated and exothermic is obvious, with CO 2 The continuous introduction of the crystallization increases, when the reaction to CO 2 After the specified amount is introduced, the reaction temperature reaches about 62°C, stop CO 2 Inlet, keep the temperature at 70℃, continue to stir for 2 hours, after fully crystallization and cooling, hot filter to obtain mother liquor 154.00g (K / Na = 1.08, CO 3 2- =41.45g / L, alkalinity (mixed alkali) =446.99g / L, potassium ion content 3.82%) and crude Na 2 CO 3 38.79g(K / Na=0, CO 3 2- = 51.03g / L, alkalinity (mixed alkali) = 7.53%).

Embodiment 2

[0023] Example 2 Crystallization experiment at room temperature (20°C)

[0024] Weigh 200.00g of three-effect concentrated solution (K / Na=0.62:1, CO 3 2- =15.54g / L, alkalinity (mixed alkali) =692.41g / L), pass 15.00g CO into the mixed alkali 2 , There is white Na immediately 2 CO 3 Is generated and exothermic is obvious, with CO 2 The continuous introduction of the crystallization increases, when the reaction to CO 2 After the specified amount is introduced, the reaction temperature reaches about 62°C, stop CO 2 The mixture is cooled to room temperature, stirred for 2 hours to fully crystallize, and filtered to obtain 155.00g of mother liquor (K / Na=1.08:1, CO 3 2- =41.93g / L, alkalinity (mixed alkali) =442.59g / L, potassium ion content 3.82%) and crude Na 2 CO 3 36.40g(K / Na=0, CO 3 2- = 51.63g / L, alkalinity (mixed alkali) = 6.51%).

Embodiment 3

[0025] Example 3 Crystallization experiment at room temperature (0℃)

[0026] Weigh 200.00g of three-effect concentrated solution (K / Na=0.62:1, CO 3 2- =15.54g / L, alkalinity (mixed alkali) =692.41g / L), pass 15.00g CO into the mixed alkali 2 , There is white Na immediately 2 CO 3 Is generated and exothermic is obvious, with CO 2 The continuous access to the crystallization increases, when the reaction to CO 2 After the specified amount is introduced, the reaction temperature reaches about 62°C, stop CO 2 Into the water, cool in ice water, stir for 2 hours to fully crystallize, and filter to obtain 154.00g of mother liquor (K / Na=1.08:1, CO 3 2- =43.22g / L, alkalinity (mixed alkali) =444.76g / L, potassium ion content 3.81%) and crude Na 2 CO 3 35.40g(K / Na=0, CO 3 2- =50.76g / L, alkalinity (mixed alkali)=49.50%).

[0027] Implementation column 4

[0028] Weigh 200.00g of three-effect concentrated solution (K / Na=0.62:1, CO 3 2- =15.54g / L, alkalinity (mixed alkali) =692.41g / L), pass 11.25g CO...

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PUM

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Abstract

A purpose of the invention is to achieve sodium reduction, potassium retention, and no use or less use of potassium hydroxide based on recovery utilization of mixing alkali and potassium-sodium balance adjustment in an indigo blue production process. According to the present invention, waste alkali residue, washing alkali water and surplus sodium hydroxide in oxidation alkali in the existing production are utilized, bicarbonate or carbon dioxide, and a plurality of ways are applied and introduced to the concentrate, and difference between dissolubility of sodium carbonate and potassium carbonate and a common ion effect are delicately utilized to generate sodium carbonate precipitate and separate, such that removal of surplus sodium hydroxide in the liquid alkali is achieved without introduction of new impurities, the sodium carbonate product is co-produced, about 0.5 ton of the potassium hydroxide is saved and about 1 ton of the sodium carbonate is by-produced when per ton of the indigo blue product is produced, and a new process route with characteristics of alkali resource comprehensive utilization and delicate potassium and sodium balance is developed. With the present invention, characteristics of low investment, resource saving, cleaning, environmental protection, economy, novelty, strong practicality and wide generalization application value are provided, significant theory and application values are provided for the circular economy and sustainable development strategy, ??and wide social benefits, economic benefits and ecological benefits are provided.

Description

Technical field [0001] The invention belongs to the field of dye chemical raw material production, and is a clean production and resource comprehensive utilization technology of indigo and other vat dyes. Background technique [0002] Indigo is a green and environmentally friendly primary color dye with a long history. It is widely used in the coloring of cotton, linen and viscose fabrics, especially in the warp dyeing of indigo denim. [0003] The current industrial production is to prepare indigo through the oxidation of 3-indoxylate. The reaction process includes a certain amount of anilinoacetate, sodium amide, and a mixed alkali of sodium hydroxide and potassium hydroxide at 220-250℃. Through the reaction, 20-30% of the alkali melt of 3-indoxylate is obtained, which is dissolved in a large amount of water, oxidized by air, and then filtered, washed, and granulated to obtain indigo. [0004] The molar ratio of KOH to NaOH in the oxidized dilute lye is about 0.6:1, which is far l...

Claims

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Application Information

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IPC IPC(8): C09B7/00C01D7/12
Inventor 尹应武张正西喻宏贵吴德生栾敏红董泽高尹建炉朱建
Owner JIANGSU TAIFENG CHEM
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