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Production process of calcium chloride

A production process, calcium chloride technology, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, multi-effect evaporation, etc., can solve the problem that the purity of calcium chloride cannot be guaranteed well, Achieve the effects of avoiding uneven heating, increasing production, and being easy to operate and control

Active Publication Date: 2019-03-29
台山市新宁制药有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature is lower than 50 degrees or the concentration of calcium chloride is lower than 58%, calcium chloride tetrahydrate will crystallize, and the temperature is higher than 175 degrees or the concentration is greater than 75% calcium chloride monohydrate will also crystallize. For pharmaceutical grade calcium chloride, the purity of calcium chloride cannot be well guaranteed

Method used

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  • Production process of calcium chloride
  • Production process of calcium chloride
  • Production process of calcium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take 2kg of purified water to dissolve 1kg of industrial calcium chloride, fully stir and dissolve to form a calcium chloride solution, then add lime water to the solution to adjust the pH of the solution to 10, heat the temperature to 50 degrees, and then pass 30% into the solution Concentration of 10.2g of hydrogen peroxide is used for oxidation reaction. During the oxidation process, calcium hydroxide solution is used to keep the pH of the solution at 9-10, and then hydrogen sulfide gas is introduced into it, and the reaction is stirred for 10-20 minutes. Finally, polyacrylic acid is used for adsorption Precipitation was obtained by filtration to obtain the filtrate.

[0047] Take the filtrate and add hydrochloric acid to adjust the pH of the solution to 7-8, then enter the multi-effect evaporator for evaporation and concentration, and obtain a calcium chloride solution with a mass fraction of 68% after concentration. Then the concentrated solution is sent to the cry...

Embodiment 2

[0052] Take 2kg of purified water to dissolve 1kg of industrial calcium chloride, fully stir and dissolve to form a calcium chloride solution, then add lime water to the solution to adjust the pH of the solution to 11, and heat up to 60 degrees, and then pass 35% into the solution The concentration of hydrogen peroxide is 5.83g for oxidation reaction. During the oxidation process, the pH of the solution is kept at 9-10 by calcium hydroxide solution, and then hydrogen sulfide gas is passed into it, and the reaction is stirred for 10-20 minutes, and finally the reaction is carried out with polyacrylamide. The precipitate was adsorbed, and the filtrate was obtained by filtration.

[0053] Take the filtrate and add hydrochloric acid to adjust the pH of the solution to 7-8, then enter the multi-effect evaporator for evaporation and concentration, and obtain a calcium chloride solution with a mass fraction of 70% after concentration. Then the concentrated solution is sent to the cry...

Embodiment 3

[0058] Take 2kg of purified water to dissolve 1kg of industrial calcium chloride, fully stir and dissolve to form a calcium chloride solution, then add lime water to the solution to adjust the pH of the solution to 11, and heat up to 60 degrees, and then pass 35% into the solution The concentration of hydrogen peroxide is 7.23g for oxidation reaction. During the oxidation process, the pH of the solution is kept at 9-10 by calcium hydroxide solution, and then hydrogen sulfide gas is passed into it, and the reaction is stirred for 10-20 minutes, and finally it is carried out with polyacrylamide. The precipitate was adsorbed, and the filtrate was obtained by filtration.

[0059] Take the filtrate and add hydrochloric acid to adjust the pH of the solution to 7-8, then enter the multi-effect evaporator for evaporation and concentration, and obtain a calcium chloride solution with a mass fraction of 60% after concentration. Then the concentrated solution is sent to the crystallizati...

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Abstract

The invention relates to a production process of calcium chloride. The production process of the calcium chloride comprises the following steps: a, dissolving; b, purification; c, neutralizing; d, primary concentration; e, crystallization; f, secondary concentration; and g, cooling, smashing and packaging. A first heating device, a second heating device, a main oil heating furnace and an auxiliaryoil heating furnace are included in secondary concentration; and a secondary concentration device comprises the first heating device and the second heating device connected with the first heating device, and further comprises a controller and a liquid level sensor, wherein the heating temperature of the first heating device is kept to be 115-125 DEG C, and the heating temperature of the second heating device is kept to be 135-145 DEG C. According to the production process of the calcium chloride, by setting two-time concentration operation and adopting an evaporator, the yield of the calciumchloride of crystallization water of the two times in a finished calcium chloride product can be 98% or above.

Description

technical field [0001] The invention belongs to the technical field of calcium chloride production, and more specifically, relates to a calcium chloride production process. Background technique [0002] Industrial calcium chloride is divided into anhydrous calcium chloride, dihydrate calcium chloride and liquid calcium chloride. Industrial calcium chloride is generally produced from the distillation waste liquid in the production of soda ash by the ammonia-soda method, and it is also produced by the reaction of hydrochloric acid and limestone. Industrial calcium chloride is mainly used as refrigerant, antifreeze, ice-melting and snow-melting agent, fog-eliminating and dust-removing agent, etc. Among them, calcium chloride dihydrate is generally used as calcium chloride dihydrate, and its molecular formula is CaCl 2 2H 2 O, molecular weight: 147.02, white, hard fragments or granules; odorless, slightly bitter taste; easily deliquescent, easily soluble in water, easily solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/30C01F11/32B01D1/26
CPCB01D1/26C01F11/30C01F11/32
Inventor 叶宏裕杨庆辉邝冠英肖国寅
Owner 台山市新宁制药有限公司