Background and overview of preparation and application of calcium bicarbonate
Calcium bicarbonate (Ca(HCO3)2) is an unstable inorganic compound that is easily soluble in water and has a relative molecular mass of 162.06. Calcium bicarbonate can be used as calcium fortifier, emulsion stabilizer, dough conditioner, nutritional supplement, buffer, loosening agent, dough improver nutritional supplement, yeast food, emulsifier, solidifying agent, antioxidant synergist ,stabilizer.
Preparation and application of calcium bicarbonate
Report 1,
Dissolve calcium chloride dihydrate in acetone to a concentration of about 15mmol/L, then add triethylamine to an equal volume of acetone to a concentration of about 37.5mmol/L. After mixing evenly, add sufficient carbon dioxide gas into the solution containing triethylamine. Then mix the two solutions under stirring, centrifuge until white turbidity forms, and remove the supernatant. After the solvent evaporates at dry room temperature, high-purity calcium bicarbonate powder can be obtained.
Report 2,
Select the new wet acetylene carbide slag of a salinization company (moisture content 37.9%, peculiar odor, gray-black), commercially available canned liquid carbon dioxide, commercially available chlorine dioxide and cesium carbonate oxidant, and use commercially available stabilizers Using triethanolamine and sodium bicarbonate, prepare calcium bicarbonate from carbide slag as follows:
(1) Purification treatment: At room temperature of 10°C and normal pressure, make the carbide slag into a suspension slurry with a water/solid ratio of 7:1, and add chlorine dioxide oxidant dropwise under continuous stirring (the amount of carbide slag is 0.01% of mass) until the odor is completely eliminated;
(2) Carbonic acid liquefaction and solidification of impurities: Place the non-toxic suspension slurry obtained in step (1) into a pressure stirring tank, press in carbon dioxide at 10°C, and maintain the carbon dioxide pressure in the pressure stirring tank at 1.0MPa~3.0MPa React for 1.2h to obtain a mixture;
(3) Solid-liquid separation: Filter and separate the mixture obtained in step (2) while maintaining a carbon dioxide pressure of 1.0MPa to 3.0MPa to obtain filter residue and filtrate; the filter residue is detected to contain carbon, silicon, aluminum, iron, etc. A complex mixture of inorganic compounds with no peculiar smell and can be directly used as raw material for the production of cement and building materials products; the filtrate is a supersaturated solution of Ca(HCO3)2;
(4) Crystallization after homogenization of the stabilizer: While maintaining a pressure of 1.0MPa to 3.0MPa, add the stabilizer triethanolamine (the dosage is 0.55% of the mass of the filtrate) and sodium bicarbonate (the dosage is 0.8% of the mass of the filtrate) After adding to the filtrate obtained in step (3) and homogenizing, drain the pressure of carbon dioxide from 1.0MPa to 3.0MPa in the liquid tank to normal pressure, and let the resulting mixed solution stand for 3 hours at 5℃ boron trifluoride tetrahydrofuran complex at normal pressure. , crystallize and filter to obtain calcium bicarbonate solid.
Preparation and application of calcium bicarbonate
CN201510576313.6 reports a method for filling and clarifying the second-pressure juice of a sugar factory with calcium bicarbonate. The steps are: (1) heating the second-pressure juice to 55°C-75°C; (2) heating the second-pressure juice Add calcium bicarbonate to the juice at an amount of 120-500ppm; (3) Add lime milk to the second-pressure juice after adding calcium bicarbonate to make the pH value 8.5-10.5; (4) Add the pH value to 8.5-10.5 The second-pressed juice is clarified by air flotation to obtain floating mud juice and clear juice; (5) Heating the floating mud juice to 75℃-85℃; (6) Filtering the heated floating mud juice with a filter press to obtain filter mud and clear juice. Filter the juice; (7) Mix the clear juice and the filtered juice to complete the clarification of the second juice. The present invention uses calcium bicarbonate to fill and clarify the second-pressure juice of a sugar factory, so that the first-pressure juice and second-pressure juice split clarification processes and the semi-carbon process can be combined to improve the sugarcane juice clarification efficiency of the sugar factory, thereby improving the efficiency of my country’s sugarcane sugar industry. International Competitiveness.
CN201220372881.6 reports a solid fuel for civilian use, especially an environmentally friendly barbecue fuel rod containing charcoal powder, clay, and food-grade calcium bicarbonate. It includes a body, which is characterized in that the body has the shape of a right prism, and there is a through hole running through the upper bottom surface and the lower bottom surface along the axial direction of the right prism. The diameter of the virtual circumscribed circle of the upper bottom surface and the lower bottom surface is 4cm-6cm. , the diameter of the through hole is 1cm-2cm. Compared with the existing technology, the main raw material of this utility model is charcoal, which is waste and conforms to the concept of environmental protection. The clay raw material has almost no cost. Clays such as red earth, loess, and yellow clay can be used. Food-grade calcium bicarbonate has no toxic volatilization after calcination. And it can form and strengthen the skeleton support function, and the air passage during combustion will not be blocked by ashes, so there is no need to blow and fiddle with it like ordinary machine-made charcoal. The waste residue after combustion is easy to clean and can be returned to the field for utilization. The production process is simple and investment is low. few.
