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Define The Process Of Hydrogenation: Explain How It Works

Referencing Styles : MLA | Pages : 1

Hydrogenation is the process that helps in the saturation of organic compounds by making use of hydrogen molecules in the presence of catalyst. Catalyst are the agent that helps in spending up the rate of chemical reaction without changing themselves. For running this particular process and the chemical reaction, catalyst plays an essential role.  During hydrogenation, there are some common catalyst that is used and this includes platinum and nickel. Presence of atom of hydrogen is considered the important requirement in the process of hydrogenation beside the existence of catalyst. The objective of the hydrogen atom in the hydrogenation process is to remove the triple or double bond between the atoms. In other words, it can be said that the unsaturated hydrocarbon is turned into a saturated one with the help of hydrogen atoms. Therefore, the process of hydrogenation is the severe form of hydrogen treatment as it represents the chemical addition of hydrogen to the hydrocarbon in the presence of catalyst. It is required by the process of hydrogenation to maintain high pressures in the reaction vessel. In some cases, it is required to have additional seal integrity by giving problems around agitators over maintaining seals or upgrading the incorporation of system of magnetic coupling.

The results of hydrogenation requires and demand the control in temperature as it tends to be a high exothermic reaction. Such system helps in providing flexibility in the manner in which repeatable and accurate control of environment of hydrogenation is achieved and it incorporates various features. These involves control of sequence for purging and testing of the vessel pressure along with addition of hydrogen. For the pressure and temperature, there is a price loop control along with securing the on line data collection from the evidence and analysis of the process of hydrogenation. The small scale vessels of hydrogenation operates in clinical trial environment and research and development are the facilities that must be catered for several products having precise requirements defined for the addition of hydrogen itself and the associated temperature profile.  

Hydrogenation can be either non-destructive or destructive and the place where the breaks have occurred, the chain of hydrocarbons have occurred and addition of hydrogen is done. The designation of the hydrogenation process for the conversion of petroleum and petroleum products. Hydrogen is added to the molecule in the later stage and such molecule is unsaturated with respect to the hydrogen. The resulting molecules are highly stable in both the cases. Under destructive hydrogenation, higher molecular weight is converted with its constituents in the feedstock is converted to a lower boiling product. In addition to this, there are various processing conditions that is required by such treatments along with minimizing the condensation and polymerization by using high hydrogen pressures. Non-destructive hydrogenation on other hand, is generally used for the purpose of improving the quality of product without altering the boiling range. For removing the unstable contaminants of constituents containing such as sulphur, nitrogen and oxygen as hydrogen sulphide, ammonia and water respectively, the process employs mild processing conditions. Moreover, the process also converts the unstable compounds to more stable compounds and the unstable compounds contribute to the fouling of the product by the formation of insoluble material such as sludge and sediment or gum.

In most of the industries, there are wide usage of hydrogenation for preserving or purifying, solidifying many products, ingredients and raw materials. The product that are treated using the process of hydrogenation involves pharmaceuticals, polyols, margarine, ammonia, alcohol, fuels, chemicals such as hydrogen peroxide and hydrogen chloride and various polymers. Vegetable oil is the most common hydrogenated product as the vegetable oil is converted to a semi solid or solid fat from liquid. Hydrolysis of starches is used for making D-sorbitol syrup for making dextrose and this is then hydrogenated to create sugar alcohol or sorbitol. There is a process used in the petroleum industry known as hydrocracking where hydrogenation is used for breaking heavy crude of long hydrogen carbon that is chained into a lighter product of petroleum such as gasoline, diesel and jet fuel.

There are different types of industrial hydrogen having different hydrogen requirements.

A continuous fixed bed reactor- It is a reactor that is of tube shape with a fixed bed of catalyst and an integrated heating element. The introduction of hydrogen is done at the high pressure and is distributed as a gas through substance. At pressure, circulation of heated substrate is done by exposing the substance and hydrogen to the catalyst of bed. There is recycling of unused hydrogen and is fixed bed reactor is considered to be the most efficient design of hydrogenation reactor that is employed in the application of large and small scale application of pharmaceutical manufacturing and purification of petroleum. In this particular model process, hydrogen is purchased by the owner from the industrial company having a surplus supply of hydrogen and hydrogen is produced as by product in the process.

A batch hydrogenation reactor- This reactor has a large pressurized vessel containing an agitator and a heating jacket or element that suspend the catalyst in the substrate after it is heated. There is introduction of hydrogen is pressure and there is a complete blending of hydrogen, chemical starting material and catalyst particles that is ensured by agitation. Some of the most common use of this particular method of hydrogenation is manufacturing pharmaceuticals and processing of edible fats. It is required by the batch reactors that there is variation in the rate of delivery of hydrogen on the stage of completeness.

Furthermore, it has been found that hydrogenation is related to the risk of health regarding the consumption of oils and hydrogenated fats. Such risks has many things to do with the mechanism of these ingredients. The double bond of the hydrocarbon is converted to a single hydrocarbon when the molecules of hydrocarbon is attached to the unsaturated hydrocarbon. There is rearranging of double bond during hydrogenation at high temperatures and such rearranging take place in unsaturated hydrocarbons.


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