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Method for improving quality of chromic anhydride

A chromic anhydride, high-quality technology, applied in the field of inorganic chemical raw materials, can solve problems such as restrictions, high impurity content of chromic anhydride, and poor product quality

Active Publication Date: 2021-05-18
四川省绵阳市华意达化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the chromic anhydride prepared by the traditional method contains more impurities, the product quality is poor, and the application is limited.

Method used

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  • Method for improving quality of chromic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for improving the quality of chromic anhydride, comprising the steps of:

[0024] Step 1. Add 1 ton of pure water to the reactor, heat it to 90°C, then add 2 tons of chromic anhydride to the reactor, keep it for 3 hours, and pass the feed liquid through the resin column equipped with iron remover; Times iron remover volume / hour flow through iron remover; Described iron remover is CH27 iron remover resin;

[0025] Step 2: Filter the feed liquid passing through the resin column, send the filtrate to the electrolyzer, electrolyze for 5 minutes, send the electrolyzed anolyte into the concentration tank, and evaporate and concentrate to the solution at a temperature of 95°C and a stirring speed of 90r / min The Baume degree is 62, static crystallization begins for 48 hours, when the temperature of the solution drops to 25°C, use a centrifuge to dehydrate under normal pressure, dry at 90°C for 6 hours, and pack after natural cooling to obtain high-purity crystalline ch...

Embodiment 2

[0030] A method for improving the quality of chromic anhydride, comprising the steps of:

[0031] Step 1. Add 1 ton of pure water to the reactor, heat it to 85°C, then add 1.8 tons of chromic anhydride to the reactor, keep it for 3 hours, and pass the feed liquid through the resin column equipped with iron remover; Times iron remover volume / hour flow through iron remover; Described iron remover is CH27 iron remover resin;

[0032] Step 2: Filter the feed liquid passing through the resin column, send the filtrate to the electrolyzer, electrolyze for 5 minutes, send the electrolyzed anolyte into the concentration tank, and evaporate and concentrate to the solution at a temperature of 95°C and a stirring speed of 90r / min The Baume degree is 61, static crystallization begins for 48 hours, when the solution temperature drops to 25°C, use a centrifuge to dehydrate under normal pressure, dry at 105°C for 6 hours, and pack after natural cooling to obtain high-purity crystalline chromi...

Embodiment 3

[0037] A method for improving the quality of chromic anhydride, comprising the steps of:

[0038] Step 1. Add 1 ton of pure water to the reactor, heat it to 80°C, then add 1.6 tons of chromic anhydride to the reactor, keep it for 3 hours, and pass the feed liquid through the resin column equipped with iron remover; Times iron remover volume / hour flow through iron remover; Described iron remover is CH27 iron remover resin;

[0039] Step 2. Filter the feed liquid passing through the resin column, send the filtrate to the electrolyzer, electrolyze for 5 minutes, send the electrolyzed anolyte into the concentration tank, and evaporate and concentrate to the solution at a temperature of 100°C and a stirring speed of 90r / min The Baume degree is 61, static crystallization begins for 48 hours, when the solution temperature drops to 25°C, use a centrifuge to dehydrate under normal pressure, dry at 105°C for 6 hours, and pack after natural cooling to obtain high-purity crystalline chrom...

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Abstract

The invention discloses a method for improving quality of chromic anhydride, which comprises the following steps of: 1, adding pure water into a reaction kettle, performing heating to 70-115DEG C, then adding chromic anhydride into the reaction kettle, keeping the state for 2-4h, and enabling the obtained feed liquid to pass through a resin column filled with an iron removal agent; 2, filtering the material liquid passing through the resin column, electrolyzing the filtrate, evaporating and concentrating the electrolyzed anode liquid, and conducting crystallizing, dehydrating and drying to obtain high-purity crystal chromic anhydride; wherein the mass ratio of the pure water to the chromic anhydride is 1:1.3-2.2. The production process is green and clean, chromic anhydride is not decomposed in the preparation process, the product purity is high, the quality is stable, the crystal dissolution speed is high, the fluidity is good, the particle size is uniform, and dust is not raised; the process is simple and low in cost.

Description

technical field [0001] The invention relates to inorganic chemical raw materials, more specifically to a method for improving the quality of chromic anhydride, and the prepared crystal chromic anhydride has higher purity. Background technique [0002] Chromic anhydride is an important inorganic chemical raw material. The largest use of chromic anhydride is to make water-soluble wood preservative chromium copper arsenate, followed by metal finishing (mainly electroplating), catalyst production, chromium trioxide and magnetic material chromium dioxide, and as an oxidant. Chromic anhydride is also used in the production of chromium trioxide, the largest user of chromic anhydride, followed by electroplating, catalysts, oxidants, and other chromium salts and reagents. [0003] Chromic anhydride is one of the main products of chromium salt series in inorganic salts. It is mainly used in the production of chromium compounds, oxidants, and catalysts. It is also used in wood preserv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/033
CPCC01G37/033C01P2006/80Y02P20/54
Inventor 尹春林白礼太程梅冷建军宋亚林樊诗贤杜威
Owner 四川省绵阳市华意达化工有限公司