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A kind of comprehensive utilization method of electrolysis of naphthoquinone raffinate

A technology for naphthoquinone residue and naphthoquinone is applied in the field of comprehensive treatment and utilization of naphthoquinone residue, which can solve the problems of high energy consumption, increased production cost, low electrolysis current efficiency, etc., and achieves high chromium recovery rate, low energy consumption, low The effect of pollution

Active Publication Date: 2017-08-29
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that chromium is always recycled in the naphthoquinone production process, which is beneficial to reduce the band loss and increase the yield of naphthoquinone, but the disadvantages are also obvious. Due to the low efficiency of the electrolytic current, the energy consumption is large and the production cost is increased. , not conducive to production application

Method used

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  • A kind of comprehensive utilization method of electrolysis of naphthoquinone raffinate

Examples

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Effect test

Embodiment 1

[0032] Take 4L of naphthoquinone raffinate and filter it through a filter cloth with a pore size of 10um, and return the filter residue to the naphthoquinone production line for ingredients; take 2L of the filtrate and add concentrated sulfuric acid to make anolyte, Cr 6+ Content is 0.25mol / L, sulfuric acid mass ratio (as H 2 SO 4 Calculate) 10%, add the anode circulation tank of electrolytic cell; Get 2L filtrates and add boric acid, acetamide, sodium acetate to be mixed with catholyte in addition, chromium content (as Na 2 Cr 2 o 7 total) 0.30mol / L, boric acid 50g / L, acetamide 10g / L, sodium acetate 10g / L, add to the cathode circulation tank of the electrolytic cell; At 65°C, start the circulating pump, the cathode and anode liquids enter the corresponding cathode and anode chambers for circulation respectively, and pass 500A / m to the cathode and anode plates of the electrolytic cell 2 direct current, cell voltage 3-6V, Cr in the anolyte after electrolysis for 20 hours 3...

Embodiment 2

[0036]Take 4L of naphthoquinone raffinate and filter it through a filter cloth with a pore size of 10um, and return the filter residue to the naphthoquinone production line for ingredients; take 2L of the filtrate and add concentrated sulfuric acid to make anolyte, Cr 6+ Content is 0.3mol / L, sulfuric acid mass ratio (as H 2 SO 4 Calculate) 30%, add the anode circulation tank of electrolytic cell; Get 2L filtrates and add boric acid, acetamide, sodium acetate to be mixed with catholyte in addition, chromium content (as Na 2 Cr 2 o 7 Add 0.30mol / L, 100g / L boric acid, 30g / L acetamide, and 30g / L sodium acetate to the cathode circulation tank of the electrolytic cell; start the constant temperature system of the cathode and anode circulation tank to keep the temperature of the cathode and anode liquid at 65°C, Start the circulation pump, the cathode and anode liquids enter the corresponding cathode and anode chambers for circulation respectively, and pass 800A / m to the cathode a...

Embodiment 3

[0040] Take 8L of naphthoquinone raffinate and filter it through a filter cloth with a pore size of 20um, and return the filter residue to the naphthoquinone production line for ingredients; take 4L of the filtrate and add concentrated sulfuric acid to prepare anolyte, Cr 6+ Content is 0.28mol / L, sulfuric acid mass ratio (as H 2 SO 4 Calculate) 20%, add the anode circulation tank of electrolytic cell; Get 4L filtrate and add boric acid, acetamide, sodium acetate to be mixed with catholyte in addition, chromium content (as Na 2 Cr 2 o 7 0.30mol / L, boric acid 80g / L, acetamide 50g / L, sodium acetate 60g / L, add to the cathode circulation tank of the electrolytic cell; start the cathode and anode circulation tank constant temperature system to make the temperature of the cathode and anode liquid at 60 ° C, Start the circulation pump, the cathode and anode liquids enter the corresponding cathode and anode chambers for circulation respectively, and pass 500A / m to the cathode and an...

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Abstract

The invention discloses an electrolytic comprehensive utilization method of naphthoquinone raffinate. The method comprises filtering the raffinate and dividing it into two parts. One part of the raffinate is prepared by adding sulfuric acid in proportion to make anolyte and enters the anode circulation tank. Proportional addition of boric acid, amide compound, and carboxylate to prepare catholyte into the cathode circulation tank, through electrolysis, the Cr6+ content in the anolyte increases and can be returned to the naphthoquinone production line for recycling, and the metal chromium flakes obtained on the cathode plate are washed, dried, and crushed to obtain Metallic chrome powder. The invention uses an electrolytic circulation tank to electrolyze the naphthoquinone raffinate, not only can return the treated raffinate to the naphthoquinone production line, but also can obtain high-quality metal chromium powder, and the method has the advantages of low energy consumption, low pollution, and chromium recovery The advantage of high rate.

Description

technical field [0001] The invention relates to a method for comprehensive treatment and utilization of naphthoquinone raffinate, in particular to a method for synchronously realizing oxidation and reduction of menadione raffinate through electrolysis so as to be able to comprehensively utilize it. Background technique [0002] 2-methyl-1,4 naphthoquinone (2-MNQ) also known as vitamin K 3 (VK 3 ), because of its anti-hemorrhagic activity, it is widely used as a medicine and feed additive, and it is also a synthetic water-soluble, stable VK 3 and other basic raw materials for vitamins. The synthesis method of 2-MNQ varies with different raw materials, and the chemical oxidation method using 2-methylnaphthalene (2MN) as raw material is widely used because of its cheap and easy-to-obtain raw materials and simple process. But the process uses CrO 3 or Na 2 Cr 2 o 7 As an oxidizing agent, a large amount of Cr-containing 6+ and Cr 3+ The waste liquid (i.e. raffinate) cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/02C25C5/02C25C1/10C25B3/23
CPCC25C1/10C25C5/02C25B3/23Y02P10/20
Inventor 李先荣陈宁董明甫王方兵黄玉西郑新星
Owner SICHUAN YINHE CHEM
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