Cleaning type preparation method for medicinal basic magnesium carbonate

A technology of clean production and magnesium carbonate, applied in the direction of magnesium carbonate, etc., can solve the problems of high production cost, low environmental benefit, low economic efficiency, etc., and achieve the effect of low production cost, simple production process and clean production process technology

Inactive Publication Date: 2007-08-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that it uses expensive soda ash as raw material, and the production cost is high.
[0008] The above-mentioned methods all have the disadvantages of low purity, low economy and low environmental benefit.

Method used

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  • Cleaning type preparation method for medicinal basic magnesium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix bittern and condensate in a volume ratio of 3:4, add 30ml of bittern to a 250ml beaker, heat to 50°C, then slowly add 40m1 of condensate, stir, boil for 3min, cool and age for 24 hours, heat washed with deionized water, and dried at 120° C. for 6 hours to obtain 5.34 g of the product, with a yield of 85.3%.

Embodiment 2

[0020] Mix bittern and condensate in a volume ratio of 3:4, add 30ml of bittern to a 250ml beaker, heat to 60°C, then slowly add 40ml of condensate, stir, continue heating for 60min, cool and age for 24 hours, use Washed with hot deionized water and dried at 120° C. for 6 hours to obtain 5.46 g of product with a yield of 87.2%.

Embodiment 3

[0022] Mix bittern and condensate in a volume ratio of 3:4, add 30ml of bittern to a 250ml beaker, heat to 70°C, then slowly add 40ml of condensate, stir, continue heating for 60min, boil for 3min after heating, cool and Aged for 24 hours, washed with hot deionized water, and dried at 120° C. for 6 hours to obtain 5.4 g of the product with a yield of 86.3%.

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Abstract

The invention provides a method for clean preparation of medicinal basic magnesium carbonate, belonging to the art of fine chemical industry. The process contain: using salt-produced waste fluid bittern and the by-product incinerator condensate liquid in soda plant as raw material, the volumetric ratio of bittern to condensate liquid being 3: 4; adding bittern into a reactor, heating up to 50-80Deg. C, adding slowly the condensate liquid and with mixing, keeping temperature for 1 hour in reaction temperature; aging for 24 hours after finishing of reaction, filtering, washing with deionized water to wash out sulfate ion and chloride ion; and drying in 90-130Deg. C to prepare basic magnesium carbonate. The invention is characterized in that the product yield is as high as 79-88%, the cost is low, non contaminant is produced, and the production process is simple. The product can also be food-grade basic magnesium carbonate.

Description

(1) Technical field [0001] The invention relates to a clean production and preparation method of medicinal basic magnesium carbonate, which belongs to the technical field of fine chemicals. (2) Background technology [0002] Medicinal basic magnesium carbonate, also known as heavy magnesium carbonate, its molecular formula is xMgCO 3 ·yMg(OH) 2 ·zH 2 O, the chemical name is hydrated basic magnesium carbonate, which is a mixture of magnesium carbonate and magnesium hydroxide, and the content of magnesium oxide is about 40.0%-43.5%. It is generally white granular powder, non-toxic and odorless. Stable in air, almost insoluble in water or ethanol, but can make water weakly alkaline; release carbon dioxide in dilute acid and dissolve by boiling. It decomposes above 300°C, releases water and carbon dioxide, and generates magnesium oxide. The apparent specific volume is 1.4-2.5mL / g; it has good fluidity, excellent dispersibility and filling ability. [0003] The main raw mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24
Inventor 高灿柱张家明
Owner SHANDONG UNIV
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