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Indigo blue oxidation filter cake post-treatment process

A technology of filter cake and indigo, which is applied in the field of production technology of traditional dye indigo

Inactive Publication Date: 2014-01-15
韩扶军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is to overcome the deficiencies of the post-treatment of the indigo oxidation filter cake in the traditional process, and adopt three core steps to design a new process for the post-treatment of the indigo oxidation filter cake, and oxidize the wasted hydrogen in the traditional process Potassium / sodium recycling and significant reduction in wastewater discharge

Method used

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  • Indigo blue oxidation filter cake post-treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: Get 1.86 kilograms of indigo oxidation filter cake, add 2000g water to dilute, pass into 220 grams of carbon dioxide in the form of bubbling gradually under stirring state, most of carbon dioxide is absorbed, a small amount of discharge system. Filter the reaction solution again to obtain the neutralized filter cake and the neutralized filtrate, get 1000g of water to wash the neutralized filter cake, and obtain the neutralized washing liquid, and the neutralized washed liquid is prepared to be used as dilution water next time, and the neutralized filter cake after washing is directly Go to the drying and granulation section for processing. Add 340 grams of fine powdered quicklime to the neutralized filtrate, fully stir and react under reflux for 36 hours, and filter after the reaction to obtain causticizing filter cake and causticizing filtrate. The single-pass recovery rate of potassium hydroxide reaches more than 60%. The content of each component is li...

Embodiment 2

[0014] Embodiment 2: Get 1.86 kilograms of indigo oxidation filter cake, add 2000g water to dilute, pass into 280 grams of hydrogen chloride gradually under stirring state. Filtrate again to obtain a neutralized filter cake and a neutralized filtrate, take 1000 g of water to wash the neutralized filter cake, and obtain a neutralized washing liquid. The content of each component is listed in the table below. The filtrate can be refined and electrolyzed to produce potassium hydroxide, with a single-pass recovery rate of over 80%.

[0015]

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Abstract

The present invention relates to a new post-treatment process for an indigo blue oxidation filter cake obtained in an oxidation work section during an indigo blue dye production process. The process comprises that: an indigo blue oxidation filter cake in a plate frame with no washing or proper washing is taken out and placed into a stirring kettle; a proper amount of dilution water is poured; an acid substance is added while stirring to carry out a complete neutralization reaction, wherein the acid substance comprises four substances such as hydrogen chloride, sulfuric acid, phosphoric acid and carbon dioxide and concurrently comprises aqueous solutions of the four substances; and the neutralization reaction produces corresponding salts, and a filtration method is adopted to separate the salts and the indigo blue, wherein the indigo blue is slightly washed and is added to a finished product work section, the salts can be treated by adopting targeted methods according to the added different acids, hydroxides can be recovered from carbonates by adopting a causticization method, hydroxides can be recovered from chlorides by adopting an electrolysis method, and sulfates and phosphates can be sold after refinement. According to the invention, alkali consumption can be substantially reduced, an indigo blue yield can be increased, and the total amount of wastewater can be reduced.

Description

technical field [0001] The invention relates to the production process of traditional dye indigo in fine chemical industry. It specifically relates to the post-treatment process of the filter cake obtained in the indigo oxidation workshop section. Background technique [0002] Indigo is a traditional vat dye with a molecular formula of C16H10O2N2 and a CAS number of 482-89-3. It is firstly reacted with potassium / sodium anilinoacetate, potassium hydroxide and sodium amide to form potassium / sodium indoxylate, and then in Oxidation with air or oxygen in dilute alkaline aqueous solution. The indigo oxidation filter cake mentioned in the present invention refers to the crude indoxylate produced from the oxidation of potassium indoxylate / sodium through pressure filtration. Because the indigo filter cake in the just-filtered frame contains a large amount of potassium hydroxide and sodium hydroxide, some of these strong bases exist in the free state, and some exist in the form of ...

Claims

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Application Information

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IPC IPC(8): C09B7/02C01B25/30C01D5/02C01D5/00
Inventor 韩扶军
Owner 韩扶军
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