Hydrogenation of oils and fats refers to the process in which unsaturated double bonds in oils and fats undergo an addition reaction with hydrogen under certain conditions of temperature, pressure, and mechanical stirring under the action of a catalyst to saturate the double bonds in the oils and fats. The main purposes of hydrogenating oils are: ① Increase the melting point and increase solid fat content; ② Improve the antioxidant capacity and thermal stability of oils, improve the color, odor and taste of oils and prevent aftertaste; ③ Change the plasticity of oils and obtain appropriate physical and chemical properties performance, expanded uses. Therefore, oil hydrogenation is an effective means of oil modification and has high economic value. Although the hydrogen atoms that are missing from the double bonds of unsaturated fatty acids in oil cannot be added directly, under the action of a catalyst, hydrogen is added to the double bonds of unsaturated fatty acids to make them saturated. This process is It's called hydrogenation. After hydrogenation of oil, not only the degree of saturation is greatly improved, but also the color and odor of the oil can be improved, thereby increasing the use value of the oil in industry and food. ?
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Oil hydrogenation technology
Hydrogenation process
Popular Science China | This entry is from the "Popular Science China" science encyclopedia Entry writing and application work project review
Reviewer He Xiaoyun
Hydrogenation of oils refers to the degeneration of unsaturated double bonds of oils under certain conditions of temperature, pressure, and mechanical stirring under the action of a catalyst. A process in which an addition reaction occurs with hydrogen to saturate the double bonds in fats and oils. The main purposes of hydrogenating oils are: ① Increase the melting point and increase solid fat content; ② Improve the antioxidant capacity and thermal stability of oils, improve the color, odor and taste of oils and prevent aftertaste; ③ Change the plasticity of oils and obtain appropriate physical and chemical properties performance, expanded uses. Therefore, oil hydrogenation is an effective means of oil modification and has high economic value.
Chinese name
Oil hydrogenation technology
Foreign name
Fats and Oils hydrogenation
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Hydrogenation process Hydrogenation technology development and application status
Hydrogenation principle
The hydrogen atoms missing from the double bonds of unsaturated fatty acids in oils , although hydrogen cannot be added directly, under the action of a catalyst, hydrogen is added to the double bonds of unsaturated fatty acids to saturate them. This process is called hydrogenation. After hydrogenation of oil, not only the degree of saturation is greatly increased, but also the color and odor of the oil can be improved, thereby increasing the use value of the oil in industry and food.
Hydrogenation process
Process flow
Squeezing oil - degassing, dehydration, preheating - hydrogenation reaction - cooling - filtering - catalyst (reuse ) and pure oil (post-refining)
Production process
The oil hydrogenation process is divided into intermittent and continuous according to the different movement states of the raw materials passing through the reactor; according to the hydrogen The characteristics of the reactor
can be divided into hydrogenation and hydrogenation processes with hydrogen charging and hydrogenation and hydrogenation processes with external circulation of hydrogen. Oil hydrogenation is only a section in the production process of edible hydrogenated oil. The process can be divided into three parts: pre-treatment, hydrogenation and post-hydrogenation treatment. The quality of pre-treatment for oil hydrogenation directly affects the operation of the hydrogenation unit and the production cost of hydrogenation. Whether it is edible-grade hydrogenated oil or industrial-grade hydrogenated oil, it must undergo strict pre-treatment before hydrogenation; the depth of hydrogenation post-treatment should be based on Depending on the purpose of the hydrogenated oil or the specific requirements of the user, the treatment method is decolorization and/or deodorization. ?
Search for entries
Oil hydrogenation technology
Hydrogenation process
Popular Science China | This entry is from the "Popular Science China" science encyclopedia Entry writing and application work project review
Reviewer He Xiaoyun
Hydrogenation of oils refers to the degeneration of unsaturated double bonds of oils under certain conditions of temperature, pressure, and mechanical stirring under the action of a catalyst. A process in which an addition reaction occurs with hydrogen to saturate the double bonds in fats and oils.
The main purposes of hydrogenating oils are: ① Increase the melting point and increase solid fat content; ② Improve the antioxidant capacity and thermal stability of oils, improve the color, odor and taste of oils and prevent aftertaste; ③ Change the plasticity of oils and obtain appropriate physical and chemical properties performance, expanded uses. Therefore, oil hydrogenation is an effective means of oil modification and has high economic value.
Chinese name
Oil hydrogenation technology
Foreign name
Fats and Oils hydrogenation
Fast
Navigation
Hydrogenation process Hydrogenation technology development and application status
Hydrogenation principle
The hydrogen atoms missing from the double bonds of unsaturated fatty acids in oils , although hydrogen cannot be added directly, under the action of a catalyst, hydrogen is added to the double bonds of unsaturated fatty acids to saturate them. This process is called hydrogenation. After hydrogenation of oil, not only the degree of saturation is greatly increased, but also the color and odor of the oil can be improved, thereby increasing the use value of the oil in industry and food.
Hydrogenation process
Process flow
Squeezing oil - degassing, dehydration, preheating - hydrogenation reaction - cooling - filtering - catalyst (reuse ) and pure oil (post-refining)
Production process
The oil hydrogenation process is divided into intermittent and continuous according to the different movement states of the raw materials passing through the reactor; according to the hydrogen The characteristics of the reactor
can be divided into hydrogenation and hydrogenation processes with hydrogen charging and hydrogenation and hydrogenation processes with external circulation of hydrogen. Oil hydrogenation is only a section in the production process of edible hydrogenated oil. The process can be divided into three parts: pre-treatment, hydrogenation and post-hydrogenation treatment. The quality of pre-treatment for oil hydrogenation directly affects the operation of the hydrogenation unit and the production cost of hydrogenation. Whether it is edible-grade hydrogenated oil or industrial-grade hydrogenated oil, it must undergo strict pre-treatment before hydrogenation; the depth of hydrogenation post-treatment should be based on Depending on the purpose of the hydrogenated oil or the specific requirements of the user, the treatment method is decolorization and/or deodorization. [1]
Status quo of development and application of hydrogenation technology
Development
1897-1905, Sabatier et al. used nickel as a catalyst to successfully add gaseous olefins In 1903, Normann obtained a patent for the hydrogenation technology of oils. In 1902, due to the shortage of margarine base oils, in order to alleviate this situation, German scientist Wilhelm used nickel as a catalyst to successfully add hydrogen to the double bonds in oils, and successively Patents were obtained in Germany and the United Kingdom; from 1906 to 1911, some companies in the United Kingdom and the United States applied hydrogenation technology to industrial production, such as processing whale oil, hydrogenating cottonseed oil to prepare shortening, etc., and thus began to use hydrogenation technology on a large scale to produce various products. Special grease. In the early 1960s, lightly hydrogenated and winterized first-grade soybean oil began to be widely used in the United States