Three-phase catalytic oxidation preparation technology of soluble chromate

A catalytic oxidation and soluble technology, applied in the direction of chromate/dichromate, etc., can solve the problems that cannot satisfy the diversified production of chromium salt enterprises, and achieve the effect of reduced reaction pressure, high reaction effect, and small equipment investment

Active Publication Date: 2013-11-27
CHONGQING MINFENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only produce a single chromium oxide green product, and a series of chromium compound products such as chromic anhydride and chrome powder tanning agent produced from sodium dichromate cannot be manufactured by this method, which cannot meet the diversified production requirements of chromium salt enterprises. needs

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  • Three-phase catalytic oxidation preparation technology of soluble chromate

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Effect test

Embodiment 1

[0030] Such as figure 1 Shown, the present invention provides a kind of technique that three-phase catalytic oxidation prepares soluble chromate, comprises the following steps:

[0031] A. Heat the sodium carbonate solution with a concentration of 20% to 150°C, and then follow the Cr 2 o 3 : Na 2 CO 3 =1:1.5 mass ratio mixed chromite or carbon ferrochrome to form a suspension, and the suspension was passed into the reaction kettle;

[0032] B. Air or oxygen heated to 150°C is continuously fed into the bottom of the reactor through the pipeline;

[0033] C. According to the catalyst in the reactor: Cr 2 o 3 =0.1:100 mass ratio to set the catalyst, the catalyst is a mixture of ferrate, nitrate, manganese oxide, manganate and permanganate, maintain the upper pressure inside the reactor at 0.1 MPa, and maintain the suspension in the reactor The liquid temperature is 150°C, and the gas-liquid-solid three-phase bubbling reaction takes 4 hours to generate soluble sodium chrom...

Embodiment 2

[0037] Concrete steps are basically the same as in Example 1, and the difference is the change of reaction conditions and parameters:

[0038] A. Heat the sodium hydroxide solution with a concentration of 60% to 300°C, and then follow the Cr 2 o 3 : NaOH = 1: 10 mass ratio mixed carbon ferrochromium to form a suspension, the suspension is passed into the reactor;

[0039] B. Air or oxygen heated to 300°C is continuously fed into the bottom of the reactor through the pipeline;

[0040] C. According to the catalyst in the reactor: Cr 2 o 3 =15:100 mass ratio to set the catalyst, the catalyst is a mixture of manganese oxide, persulfide, peroxide and ferrate, the inside of the reactor is not pressurized, and the temperature of the suspension in the reactor is maintained at 300 ° C. Liquid-solid three-phase bubbling reaction for 0.5 hours to generate soluble sodium chromate crude product and chromium residue;

[0041] D. Obtain pure sodium chromate through filtration, crystall...

Embodiment 3

[0044] Concrete steps are basically the same as in Example 1, and the difference is the change of reaction conditions and parameters:

[0045] A. Heat the sodium hydroxide solution with a concentration of 40% to 50°C, and then follow the Cr 2 o 3 : The mass ratio of NaOH=1:5 is mixed with chromite to form a suspension, and the suspension is passed into the reaction tower;

[0046] B. Continuously input the air or oxygen heated to 50°C into the bottom of the reaction tower through the pipeline;

[0047] C. According to the catalyst in the reaction tower: Cr 2 o 3 =8:100 mass ratio to set the catalyst, the catalyst is a mixture of peroxide, sodium chromate and chromic anhydride, maintain the pressure above the inside of the reactor at 0.5 MPa, and maintain the temperature of the suspension in the reactor at 50 °C, the gas-liquid-solid three Phase bubbling reaction for 6 hours to generate soluble sodium chromate crude product and chromium slag;

[0048] D. Obtain pure sodium...

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Abstract

The invention relates to a preparation technology of chromate, specifically to a three-phase catalytic oxidation preparation technology of soluble chromate. The technology comprises the following steps of: heating alkali liquor with concentration of 20-60% to 50-300 DEG C, then, mixing chromite or carbon ferrochrome with the alkali liquor according to mass ratio of Cr2O3 : alkali liquor = 1 : 1.5-10 to form suspending liquid, and introducing the suspending liquid into a reactor; continuously inputting the air or the oxygen heated to 50-300 DEG C to the bottom of the reactor through a pipeline; setting a catalyst in the reactor according to the mass ratio of catalyst : Cr2O3 = 0.1-1.5 : 100, maintaining the temperature of the suspending liquid in the reactor at 50-300 DEG C, executing gas-liquid-solid three-phase bubbling reaction for 0.5-6 hours to generate soluble chromate raw products and chromium residues; removing impurities through filtering and crystallization to obtain the chromate. With the three-phase catalytic oxidation preparation technology of the soluble chromate, Cr2O3 conversion rate is high, reaction speed is fast, energy consumption is low, residue quantity is low, environment pollution is less, equipment investment is low and corrosion is low.

Description

technical field [0001] The invention relates to a process for preparing chromate, in particular to a process for preparing soluble chromate by three-phase catalytic oxidation. Background technique [0002] Sodium chromate and potassium chromate are common soluble chromates and basic raw materials in the chromium salt industry, among which sodium chromate is an important raw material for preparing sodium dichromate, and potassium chromate is an important raw material for preparing potassium dichromate , Sodium dichromate is the most widely used and most produced chromium compound product. 10% of the world's total consumer goods are related to chromium series products. In a certain sense, the production of chromium salts has a certain strategic position. my country is the world's largest producer and consumer of sodium dichromate, accounting for about 30% of global production capacity. At present, my country's sodium dichromate production capacity is 370,000 t / a, and the outp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/14
Inventor 袁代建王增祥余冰谢继云高波曾尚平杨菲张杨王海红刘光华
Owner CHONGQING MINFENG CHEM
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