Search results
Results From The WOW.Com Content Network
Virtually all the aluminium hydroxide used commercially is manufactured by the Bayer process [10] which involves dissolving bauxite in sodium hydroxide at temperatures up to 270 °C (518 °F). The waste solid, bauxite tailings, is removed and aluminium hydroxide is precipitated from the remaining solution of sodium aluminate.
Different food preservation methods have different impacts on the quality of the food and food systems. Some traditional methods of preserving food have been shown to have a lower energy input and carbon footprint compared to modern methods. [3] [2] Some methods of food preservation are also known to create carcinogens.
Additives are used for many purposes but the main uses are: Acids Food acids are added to make flavors "sharper", and also act as preservatives and antioxidants. Common food acids include vinegar, citric acid, tartaric acid, malic acid, folic acid, fumaric acid, and lactic acid. Acidity regulators
The preservation of foods has evolved greatly over the centuries and has been instrumental in increasing food security. The use of preservatives other than traditional oils, salts, paints, [clarification needed] etc. in food began in the late 19th century, but was not widespread until the 20th century. [2] The use of food preservatives varies ...
In the Philippines, pickling is a common method of preserving food, with many commonly eaten foods pickled, traditionally done using large earthen jars. The process is known as buro or binuro . Pickling was a common method of preserving a large variety of foods such as fish throughout the archipelago before the advent of refrigeration, but its ...
Activated alumina is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 m 2 /g. The compound is used as a desiccant (to keep things dry by adsorbing water from the air) and as a filter of fluoride, arsenic and selenium in ...
Aluminium hydroxide is used as a gelatinous flocculant to filter out particulate matter in water treatment. Aluminium hydroxide is prepared at the treatment plant from aluminium sulfate by reacting it with sodium hydroxide or bicarbonate. Al 2 (SO 4) 3 + 6 NaOH → 2 Al(OH) 3 + 3 Na 2 SO 4 Al 2 (SO 4) 3 + 6 NaHCO 3 → 2 Al(OH) 3 + 3 Na 2 SO 4 ...
There are several side effects of the process, including a slight increase in a product's sweetness, but pascalization does not greatly affect the nutritional value, taste, texture, and appearance. Thus, high pressure treatment of foods is regarded as a "natural" preservation method, as it does not use chemical preservatives. [25]