Chromic anhydride is purple acicular or flake crystal. The specific gravity of 2.70. The melting point of 196 DEG C, in the molten state, slightly decomposition. Chromic anhydride is easy to absorb moisture in the air and deliquescent, soluble in water. The solubility of 15 ℃ to 160 grams /100 grams of water, soluble in water and produce dichromate, also soluble in ethanol, ether and sulphuric acid.
Initial water: 4% requirements: 0.1% with moisture material density: 1.3
Xanthan gum also known as yellow gum, xanthan gum, Xanthomonas polysaccharide, is a kind of fermentation produced by false Xanthomonas single spore polysaccharide, cabbage black rot by Xanthomonas campestris to carbohydrates as the main raw material, through the aerobic fermentation of biological engineering technology, cut off the 1, 6- the glycosidic bond, open branched, at 1, an acidic extracellular 4- bond to the synthesis of amylose is composed of an outer polysaccharide.
Xanthan gum as its special molecular structure and colloid properties, and has many functions, can be used as emulsifier, stabilizer, gel thickening agent, wetting agent, film forming agent, widely used in various fields of the national economy. Xanthan gum in our country is in great demand, but the production is still in its initial stage, it should pay attention to its production and application.
Gellan gum (GellanGum) is a kind of microbial American Kelco company in twentieth Century 80 time development of edible gum. After the xanthan gum kelco developed another new microbial extracellular polysaccharide, the gel properties of xanthan gum is more superior than that. It is the brain by Pseudomonas Elodea (Pseudomonaseloden) in the neutral condition, with glucose as carbon source, ammonium nitrate as the nitrogen source and inorganic salts are woven into the culture medium, which are produced by aerobic fermentation of extracellular polysaccharide gum, is a new type of transparent gel.
The gel properties of gellan gum superior, use at present has gradually replaced the agar, carrageenan.
Application of gellan gum is widely in food, such as Boudin, jelly, sugar, beverage, dairy products, jam, bread stuffing, smooth surface agent, candy, sugar, seasoning, etc.. Also used in non food industries, such as microbial culture medium, the slow release of medicine, toothpaste, etc..
Potassium sorbate is a colorless to white scaly crystal or crystalline powder, odorless or slight odor. Instability in the air, can be oxidized coloring, molecular weight 150.22, hygroscopicity easy soluble in water, ethanol.
Corrosion resistance: potassium sorbate could effectively inhibit molds, yeasts and aerobic bacteria activity, but also can prevent the growth and reproduction of botulinum toxin, Staphylococcus aureus, Salmonella and other harmful microorganisms, but the anaerobic bacillus and Lactobacillus acidophilus and other beneficial microorganisms is almost invalid, which restrain the development of a stronger role than sterilization, in order to effectively prolong food preservation time, and maintain the original flavor of food. The antiseptic effect is 5-10 times that of similar products of sodium benzoate. Sorbic acid (potassium) are acidic preservative, in near neutral (PH6.0-6.5) still have antiseptic effect good food.
Range of use: it has been widely used in food, beverage, pharmaceutical, tobacco, pickles, cosmetic, agricultural products, pet poultry feed and other industries, from the development trend, its scope of application is still expanding.
Double cone rotary vacuum dryer can be used in chromic anhydride, gellan gum, potassium sorbate in chemical engineering.
Double cone rotary vacuum dryer is a double conical rotary tank, equipment the middle cylindrical, both ends is conical, conical top head is designed to open the feeding (and manhole), another end for discharging valve. The tank body, is divided into three layers, the intermediate jacket heating medium can be steam, hot water or heat conducting oil circulation, heat preservation layer of alkaline superfine glass cotton, energy consumption; the inner layer on the material. When the tank in a vacuum state, the jacket is filled with heat conducting oil, hot water or steam, heat medium is heated, heat transfer to the wet material through the inner wall of the tank.
Because the vacuum state in the tank, the solvent of various materials (including water) under the condition of vacuum can be rapidly vaporized in temperature lower, and the rotary material is constantly on, both inside and outside the flip, material to continuously update the surface in contact with the wall, so as to make full use of the wall by conduction heat, drying speed, improve the drying efficiency, and can achieve the purpose of uniform drying.
Solvent wet materials after heat absorption evaporation (water vapor), through the vacuum pump vacuum suction tube is withdrawn. Midway through the low temperature condensation system (use tap water or frozen brine) for cooling, in order to achieve the purpose of recycling, saving the production cost, and improve the vacuum pump working conditions, but also reduce the pollution of the environment. |
