Production method of chromic chloride hexahydrate

A kind of technology of chromium chloride hexahydrate and production method, applied in the direction of chromium halide and the like, can solve the problems of heavy environmental pollution and great harm of hexavalent chromium, so as to reduce environmental pollution, reduce the harm of hexavalent chromium to human body, and achieve environmental protection of products. Effect

Inactive Publication Date: 2013-12-25
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a production method of chromium chloride hexahydrate, which

Method used

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  • Production method of chromic chloride hexahydrate
  • Production method of chromic chloride hexahydrate
  • Production method of chromic chloride hexahydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0048] In the enamel reaction kettle with a condenser, add 100Kg of 60w% chromic anhydride solution, slowly add 1.5Kg of 95w% ethanol into the reaction tank within 30 minutes, then mix 6Kg of ethanol and 190Kg of 35w% hydrochloric acid and slowly Add it into the reaction kettle, this process is about 2 hours to complete the process, continue to react for 1 hour to completely reduce the hexavalent chromium, evaporate and concentrate, cool and naturally crystallize, and then obtain the chromium chloride hexahydrate product through centrifugation;

[0049]

[0050] The product judgment result is a qualified product

Embodiment 2

[0052]In the enamel reaction kettle with condenser, add 200Kg of 60w% chromic anhydride solution, slowly add 3Kg of 95w% ethanol into the reaction tank within 40 minutes, then mix 12Kg of ethanol and 380Kg of 35w% hydrochloric acid and slowly add it under the condition of stirring In the reaction kettle, this process is completed in about 3 hours, and the reaction is continued for 1 hour to completely reduce the hexavalent chromium. After evaporation and concentration, cooling and natural crystallization, and then centrifuged to obtain chromium chloride hexahydrate product.

[0053]

[0054] The result of product judgment is first-class product

[0055] The chromium chloride of the present invention is a trivalent chromium salt, which can replace hexavalent chromium salt and be widely used in industries such as electroplating, dyeing agent and catalyst, and can effectively reduce environmental pollution and reduce the harm of hexavalent chromium to human body.

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Abstract

The invention discloses a production method of chromic chloride hexahydrate, which comprises the following steps that chromic anhydride is added to a reaction vessel; water with 60-80% of the mass of chromic anhydride is added for dissolving chromic anhydride; alcohol with 10-20% of the theory quantity is slowly added for prereducing chromic anhydride; hydrochloric acid with 1.1-1.3 times the theory quantity and residual alcohol with 90% of the theory quantity are uniformly mixed, and then slowly added to the reaction vessel; stirring and reaction are performed for 1h; a reacted material is evaporated and concentrated until a concentration reaches 45 baume; after the concentration of the material is qualified by evaporation, heating is stopped; natural cooling to a room temperature is performed; crystallization is performed for 8h in a slow stirring state; after the material is crystallized, a chromic chloride hexahydrate product is obtained by centrifugal separation; a mother solution is collected, returns to an evaporation system, and is continued to be condensed; and the product is crystallized and separated again. The method is clean in production, environment-friendly in product and simple in technology; and chromic chloride hexahydrate can replace heavy-pollution hexavalent chromic salt, is widely applied to the industries of electroplating, mordanting, catalysts and the like, and is a revolution of chromic salt development.

Description

technical field [0001] The invention belongs to the technical field of production of chromium chloride hexahydrate, in particular to a production method of chromium chloride hexahydrate. Background technique [0002] Chromium chloride hexahydrate (chemical formula: CrCl 3 ·6H 2 O) is dark green crystalline powder, soluble in water, soluble in ethanol, insoluble in ether. Heating decomposition. Mainly used in chrome plating, mordant dyeing, catalyst and other industries. This product is a trivalent chromium salt, so it is a general chemical and not regulated. [0003] At present, building resource-saving and environment-friendly projects, promoting the healthy development of circular economy, and increasing energy-saving and environment-friendly products have become the focus of enterprise development. [0004] The main methods of preparing chromium chloride are: chromium chloride is prepared by reduction of chromic anhydride with ethanol, chromium chloride is prepared b...

Claims

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Application Information

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IPC IPC(8): C01G37/04
Inventor 韩登仑张忠元张宏军谢希智
Owner GANSU JINSHI CHEM
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