분馏蒸馏: 증발 및 응축을 통해 분리
도입됨| English | 의미 |
|---|---|
| fraction/ˈfrækʃn/ | 분획 |
| feedstock/ˈfiːdstɒk/ | 원료 |
What would explain this observation?
- A distillation column can collect a fuel fraction 馏分 containing many compounds. Separating a useful boiling range does not make every molecule in that collected liquid identical.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Crude oil is heated so many components evaporate. Vapour enters a fractionating column that is hotter at the bottom and cooler at the top. Components condense in regions cool enough for them to become liquid. Higher-boiling hydrocarbons condense lower down; lower-boiling ones travel farther up before condensing. Each collected fraction contains molecules with similar carbon numbers and a range of boiling points, rather than one pure substance.
- fraction: A separated mixture of hydrocarbons with similar carbon numbers and boiling ranges; feedstock 化工原料: A starting material used to manufacture other chemicals or materials.
높은 끓는점을 가진 성분이 일반적으로 기둥 하단에서 응축되는 이유는 무엇입니까?
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칼럼 하단이 가장 뜨겁습니다. 높은 끓는점 성분이 증기가 끓는점 이하로 냉각되면 바로 응축되는데, 이는 칼럼 하단에서 발생합니다. 낮은 끓는점 증기는冷凝되기 전에 차가운 영역까지 상승합니다.
각 전문 용어에 대한 정확한 의미를 매칭하시오.
난이도 2/5 · 140 코인 + 오늘 첫 완료 시 소액 보너스
정의를 사용하여 유사한 양과 과정을 구분하시오.
Choose evidence that can test it
- Evaporation and condensation are physical changes: molecules are separated without breaking their carbon chains. A sufficiently volatile fraction can remain gaseous at the top; heavy material can remain near the base. Fuels include petrol, diesel oil, kerosene, heavy fuel oil and liquefied petroleum gases. Fractions also provide feedstock for the petrochemical industry, producing materials such as solvents, lubricants, polymers and detergents. Carbon atoms can bond to each other in families of related structures; this helps explain the wide variety of natural and synthetic carbon compounds.
- Trace a labelled vapour through the temperature-gradient diagram and explain where it condenses using its supplied boiling range. Compare a fraction’s intended fuel use with a feedstock use. Do not replace an explanation with a memorised order of names alone; names of other specific fractions are not required. School demonstrations must use an approved substitute apparatus and risk assessment, not a sealed heated crude-oil container.
이 경우 조사 또는 모델이 더 타당하게 만들 수 있는 두 가지 습관은 무엇인가?
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조건과 가정을 명시하면 다른 사람이 정확히 작업을 재현할 수 있으며, 근거 증거를 기록하면 결론을 검증할 수 있습니다. 반대되는 결과를 숨기는 것은 잘못된 결론을 반박할 수 있는 증거를 제거하는 것이며, 한 번의 측정으로는 더 넓은 주장을 입증할 수 없습니다.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: an illustrative column region is at 180 °C. A component with a supplied boiling point of 250 °C can condense as vapour cools into this region; one with a boiling point of 100 °C can remain gaseous and rise farther. The difference between those supplied boiling points is ΔT=250−100=150 °C. These fictional values demonstrate the separation principle, not official fraction boundaries.
Two supplied component boiling points are 220 °C and 80 °C. Find their difference. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
두 공급 성분의 비점은 220 °C와 80 °C이다. 두 값의 차이를 구하시오.
난이도 2/5 · 140 코인 + 오늘 첫 완료 시 소액 보너스
결과는 140 °C입니다.已知: 끓는점은 각각 220과 80 °C입니다. 차이 = 220 - 80 = 140 °C입니다. 끓는점 차이가 클수록 칼럼에서 분획이 쉬워집니다.
Check the conclusion and its limits
- Do not say large molecules rise farther because they are heavier or that the column creates new alkanes. Position depends on boiling behaviour within a temperature gradient. A collected fraction is not necessarily pure, and industrial temperatures vary. Cracking is a later chemical process, not another name for fractional distillation.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Fractional distillation breaks carbon–carbon bonds to make smaller molecules. This claim is false: Fractional distillation is physical separation: molecules evaporate and condense unchanged. Breaking carbon-carbon bonds to make smaller molecules is CRACKING - a chemical process done separately.
Fractional distillation: separate by evaporation and condensation: Evaporation and condensation are physical changes: molecules are separated without breaking their carbon chains. A sufficiently volatile fraction can remain gaseous at the top; heavy material can remain near the base. Fuels include petrol, diesel oil, kerosene, heavy fuel oil and liquefied petroleum gases. Fractions also provide feedstock for the petrochemical industry, producing materials such as solvents, lubricants, polymers and detergents. Carbon atoms can bond to each other in families of related structures; this helps explain the wide variety of natural and synthetic carbon compounds.
분류 증류는 작은 분자를 만들기 위해 탄소-탄소 결합을 끊습니다.
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분류 증류는 물리적 분리입니다: 분자는 증발하고 응축해도 변하지 않습니다. 작은 분자를 만들기 위해 탄소-탄소 결합을 끊는 것은 크랙킹이며, 이는 별개의 화학 과정입니다.
탄소 수와 끓는점 범위가 유사한 탄화수소의 분리된 혼합물: 이 기술 용어를 적으십시오.
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분류(fraction)란 탄소 수와 끓는점 범위가 유사한 탄화수소의 분리된 혼합물을 의미합니다.