How does ethylene is produced?
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Ethylene is produced through various methods. One common approach is the catalytic dehydration of ethanol, although it may not always yield the desired purity of 99.97% . Another method involves dehydrogenation of ethane, followed by low-temperature separation and rectification to obtain ethylene and ethane fractions . Additionally, a process involves pyrolyzing a compression stream, distillation, and separation steps to produce ethylene . Furthermore, a process includes catalytically cracking a hydrocarbon feedstock to obtain propylene, separating it into a C3 component, and disproportionating it to obtain ethylene . Lastly, an ethylene production method includes feeding hydrocarbon material into an olefin cracking unit, disproportionating C3 components, and utilizing ethane and propylene streams to enhance ethylene yield .
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| Papers (5) | Insight |
|---|---|
| Ethylene is produced by feeding hydrocarbon material into an olefin cracking unit to obtain C3 components, ethane, and more, enhancing ethylene yield and economic efficiency in the process. | |
| Ethylene is produced by catalytically cracking a hydrocarbon feedstock to obtain propylene, separating it into a C3 component stream, and then disproportionating the C3 component stream to obtain ethylene. | |
| Ethylene is produced by supplying pyrolyzed compression stream to a first distillation apparatus with deethane or depropane towers, then passing the upper discharge stream to a second distillation apparatus. | |
| Ethylene is produced by catalytic dehydration of ethanol as an alternative to steam cracking of naphtha, aiming for high purity levels suitable for various industrial applications. | |
| Ethylene is produced by dehydrogenation of ethane in a method involving low-temperature separation, rectification, and pressure-change adsorption to obtain ethylene and ethane fractions with high purity. |
Related Questions
What are emissions for ethanol to ethylene processing?5 answersEmissions associated with ethanol to ethylene processing include environmental impacts such as soil and water pollution, greenhouse gas emissions, acidification, and air pollution. Additionally, the conversion of ethanol to ethylene involves anaerobic fermentation of ethanol to produce the intermediate compound, ethanol, which is then further converted to ethylene. Furthermore, the process of producing ethylene from ethanol involves catalytic conversion of hydrocarbons, resulting in a high concentration of ethylene in the gas product and a conversion rate of ethylene not less than 99%. Overall, the ethanol to ethylene processing emits pollutants and greenhouse gases, but advancements in technology aim to reduce emissions and improve the efficiency of the conversion process.
Can ethylene be produced from ethanol?4 answersYes, ethylene can be produced from ethanol through various methods. One approach involves the electrochemical oxidation of ethanol to 2-chloroethanol, followed by alkaline cyclization, utilizing chloride ions as catalysts. Another method utilizes a supported heteropolyacid salt catalyst in the dehydration of ethanol to produce ethylene at relatively low temperatures, enhancing ethanol conversion and ethylene selectivity. Additionally, a process involving a mordenite molecular sieve catalyst, selectively dealuminated, enables high ethylene selectivity and conversion rates under low-temperature conditions. Zeolites with BEA structure, particularly HAlBEA, can also facilitate ethylene production from ethanol, with Ni addition improving ethylene selectivity and stability, especially when using diluted bioethanol solutions. Furthermore, modified HZSM-5/SAPO-11 molecular sieves show high ethanol conversion and ethylene selectivity, making them effective catalysts for continuous ethylene production from ethanol.
What is ethylene?5 answersEthylene is a gaseous plant hormone that plays a crucial role in various physiological and biochemical processes in plants. It is involved in plant growth, development, ripening, and senescence of fruits, vegetables, and ornamental crops. Ethylene can freely diffuse across membranes and is generated at or near its site of action. It affects blooming induction, flower bud opening, abscission, adventitious root production, stem and petiole elongation, and stomatal aperture opening and closing. Ethylene is important for extending the storage and shelf life of climacteric fruits, but its accumulation can lead to fruit decay and waste during the postharvest stage. In leafy vegetables, ethylene can induce physiological disorders that compromise visual and nutritional quality. Understanding the regulation of ethylene and its interaction with other signaling molecules can contribute to improving plant functionality and adaptation to adverse environmental conditions.
What is the process to make graphene?5 answersGraphene can be produced using various methods. One method is mechanical exfoliation, where graphene layers are separated from bulk graphite. Another method is chemical vapor deposition (CVD) synthesis, which involves a reaction between a gaseous hydrocarbon and a solid substrate to promote graphene growth. The modified Hummer's method is another approach, which uses oxidizing and reducing agents to obtain graphene oxide (GO) from graphene flakes, followed by synthesis of graphene as the final product. Another process involves preparing a mixed solution from graphene oxide, a dispersant, a reducer, and a structure reinforcer, and then subjecting it to freezing and heat treatment to obtain graphene. A physical method includes high temperature shaping, delaminating graphite, stripping and dispersing delaminated graphite, preparing slurry, removing functional groups, and vacuum-drying the product. Another method involves forming a graphite/water mixture and introducing it into a cavitation reactor using offset nozzles, resulting in graphene with high carbon content. Additionally, graphene can be produced by subjecting graphite particles to electrodynamic liquefaction in a vacuum, causing them to split into graphene layers during brittle fracture.
What are the main uses of ethylene and propylene?5 answersEthylene and propylene have various uses in different industries. Ethylene is used as fuel for combustion engines, where it is fed into the combustion chamber and burned. It is also used in the production of ethylene copolymers, which contain photochemically activatable groups and can be used in various applications. Additionally, ethylene copolymers containing carboxyl groups are used in the production of materials for material separation. Propylene, on the other hand, is commonly used in the production of ethylene-propylene polymers (EPDM or EPM), which are synthetic rubbers known for their excellent resistance to ozone and aging. EPDM is used in automotive weatherstrip profiles, radiator hoses, building and construction materials, cable and wire insulation, and as an impact modifier for thermoplastics. Overall, ethylene and propylene find applications in fuel, polymer production, material separation, and the rubber industry.
How are ethylene plants used in the chemical industry?5 answersStep 1: Ethylene plants are used in the chemical industry for the production of various materials and chemicals, including plastics, ethanol, detergents, and more. They are also involved in the production of polyethylene for plastic bags and trashcan liners, as well as in the production of ethylene oxide used in the production of detergents and surfactants, and polystyrene used for packaging and insulation. Additionally, ethylene can be converted to gasoline-like molecules, showcasing its versatility. The production of ethylene from renewable resources such as CO2 and biomass is of great interest due to the environmental and financial costs associated with the current production methods. Furthermore, there is ongoing research on improving ethylene productivity using microbial pathways, particularly via the ethylene-forming enzyme (EFE), which has the potential for bioethylene production.
Step 3: "Ethylene plants are used in the chemical industry for the production of various materials and chemicals, including plastics, ethanol, detergents, and more. They are also involved in the production of polyethylene for plastic bags and trashcan liners, as well as in the production of ethylene oxide used in the production of detergents and surfactants, and polystyrene used for packaging and insulation. Additionally, ethylene can be converted to gasoline-like molecules, showcasing its versatility.". "The production of ethylene from renewable resources such as CO2 and biomass is of great interest due to the environmental and financial costs associated with the current production methods.". "Furthermore, there is ongoing research on improving ethylene productivity using microbial pathways, particularly via the ethylene-forming enzyme (EFE), which has the potential for bioethylene production.".