Main applications of heavy magnesium carbonate_industrial additives

Main application background and overview of heavy magnesium carbonateDi-tert-butyl dicarbonate

Heavy magnesium carbonate is also called basic magnesium carbonate, its chemical formula is 3MgCO₃·Mg(OH)₂·4H₂ O, mainly used in food, cosmetics and pharmaceutical industries. In recent years, heavy magnesium carbonate has been widely used in flour improvers. As an auxiliary ingredient, it can improve the dispersion and fluidity of flour improvers and is an anti-caking and loosening agent. At present, the domestic demand for heavy magnesium carbonate is increasing year by year, showing good development prospects. The heavy magnesium carbonate produced under appropriate conditions is white granular crystals with uniform size, high packing density and good fluidity. It is an ideal food additive.

Main Application Preparation of Heavy Magnesium Carbonate

Method 1: The preparation principle of heavy magnesium carbonate is shown in the equation (the theoretical mass fraction of magnesium oxide in the product is 42%): 4MgCl2+boron trifluoride tetrahydrofuran complex 4Na2CO3+4H2O=8NaCl+3MgCO3·Mg (OH)2·4H2O↓+CO2↑. The preparation process is shown in Figure 1.

Experimental method: Add refined brine to the soda ash solution at a volume ratio of 1:1, control a certain temperature, stir slowly, fully react, insulate and age the precipitation for 3 to 4 hours, and then use a circulating vacuum pump Filtrate with suction and wash the precipitate repeatedly with deionized water until the filtrate does not appear turbid when tested with a mixture of 2 mol/L silver nitrate solution and 2 mol/L nitric acid solution, indicating that there is no free Cl-. Then place the precipitate in an oven and dry it at 100-110°C. After drying to constant weight, weigh it and calculate the yield. Determination of MgO mass fraction: Weigh a certain amount of sample, treat it with hydrochloric acid to form a solution, adjust pH=10 with NH4Cl-NH3·H2O buffer solution, use chrome black T as indicator, titrate with EDTA standard solution, and calculate Mg2+ Mass fraction, thereby calculating the mass fraction of MgO in the product. Determination of bulk density: Use a 10 mL graduated cylinder. Wash the measuring cylinder, dry it to constant weight, and weigh it to obtain mass b. Then add the sample dried to constant weight to the measuring cylinder to the mark, and weigh it to obtain mass a. The bulk density of the product is (a-b)/10(g/ mL).

Method 2:

Operation process: First, add a certain amount of Na2CO3 solution to the reactor, and add an equal molar concentration and equal volume of MgCl2 solution into the Na2CO3 solution while stirring at room temperature. After the dropwise addition is completed, put it into a constant temperature bath, control the constant temperature for pyrolysis and stir from time to time. After pyrolysis for a certain period of time, vacuum filter while hot, wash with deionized water until the filtrate no longer contains Cl-, drain, and dry in an oven. After drying to constant weight, weigh and calculate the yield. Grind the product finely, pass through a 200-mesh sieve, and put it into a sample bottle for testing. Determination of MgO content: Weigh a certain amount of sample, treat it with hydrochloric acid to prepare a solution, adjust pH=10 with NH4Cl-NH3·H2O buffer solution, use K-B as indicator, and titrate the Mg2+ content with EDTA standard solution to obtain MgO content in the product. Determination of bulk density: Use a 50ml measuring cylinder. First, wash the measuring cylinder, dry it to constant weight, and weigh it to get B. Then put the sample into the measuring cylinder to the mark, dry it to constant weight, and weigh it to get A. The bulk density of the product is (A-B)/50(g/ ml).

Main applications of heavy magnesium carbonate

As an important product in the magnesium salt industry, heavy magnesium carbonate is widely used in the food, cosmetics and pharmaceutical industries. In recent years, with the continuous advancement of application technology, the application fields of heavy magnesium carbonate have been continuously broadened, and many new uses have been developed, such as: used in rubber, medicine, insulation materials, dental preparations, high-grade glass, food and various chemicals. Product additives and improvers, etc. At present, the demand for heavy magnesium carbonate in various countries around the world is increasing, and the market of heavy magnesium carbonate in my country is also in the development stage, with broad application prospects.

1) Prepare a compound preparation containing aspirin, which is characterized by an inner and outer multi-layer preparation composed of aspirin and an alkaline drug such as aluminum glycol and heavy magnesium carbonate. There is an isolation layer between the inner and outer layers of drugs to block aspirin and Direct contact with alkaline drugs. Aluminum glycerol can neutralize gastric acid, improve clinical symptoms such as increased gastric acidity and upper abdominal pain, and has astringent and hemostatic effects; heavy magnesium carbonate is an antacid, which can reduce the adverse stimulation of the stomach by aspirin and significantly reduce gastric mucosal erosion. and the incidence of ulcers, thereby protecting the stomach.

2) Prepare compound Chenxiangwei medicine. The preparation method is: 1. Extract dried tangerine peel with 60%-85% ethanol, recover the ethanol, and concentrate it into a liquid extract; 2. Extract volatile oils from Acosta and Acorus by steam distillation, filter the distillate, and concentrate it into a liquid extract; 3. .Use ultrafine grinding of rhubarb, and use ultrafine powder for later use; 4. Crush sodium bicarbonate, heavy magnesium carbonate, and aluminum hydroxide into fine powders respectively, and mix well; 5. Combine tangerine peel extract with costus and calamus extracts, Add ultrafine pulverized rhubarb powder, sodium bicarbonate, heavy magnesium carbonate, and aluminum hydroxide fine powder, granulate, dry, spray into the volatile oils of Acosta and Acorus, mix well, and make tablets/capsules. The compound Chenxiangwei medicine of the present invention has pharmacological effects on the central nervous system, especially sedative, analgesic, hypnotic and anticonvulsant effects.