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Составить 5 во к тексту As a raw product, crude oil is of limited use. Refineries must separate and process the mix of hydrocarbons which make up crude oil before they can be transformed into hundreds of useful products such as gasoline, diesel and jet fuels. The first and most important step is to separate it into various component or fractions. This takes place in a fractionating column, also known as an atmospheric distillation tower. This is a tall steel tower with perforated trays. Since each fraction has a different boiling range, a distillation tower is able to separate the various fractions using heat and cooling. Heavier hydrocarbons boil at much higher temperatures than lighter hydrocarbons. They settle in trays at the bottom of the tower closest to furnace. The lighter fractions collect at the top. Distillation is a continuous process which begins by heating crude oil in a furnace. Then it turns into a vapor. The vapor rises through perforations in the trays that are fitted with bubble caps. These caps force the vapor to pass through a previously liquefied fraction in the tray. This cools the vapor enough for it to shed that fraction. The remaining vapor repeats this process as it continues upwards. As each fraction reaches the tray where the temperature is just below its own boiling point, it condenses, liquefies and is drawn off the tray by pipes. A number of trays are needed to collect the liquids from each fraction. The products of distillation can be divided into four categories: 1 Gases and light gasoline The gases (methane, ethane, propane and butane) are commonly used to fuel refinery furnaces while the light gasoline is routed to gasoline blending. 2 Light distillates (naphta, kerosene) Naphta is used in the production of gasoline and petrochemicals. Kerosene is used as a jet fuel and stove oil 3 Middle distillates (light and heavy gas oils) Light gas oils are made into jet, diesel and furnace fuels. Heavy gas oils undergo further chemical processing such as cracking to produce naphta and other products. 4 Residual products Residual products are further processed to produce refinery fuels, heavy fuel oil, waxes, greases and asphalt. The next step is conversion. During this process fractions from distillation towers are transformed into streams (intermediate components) that eventually become finished products. The most widely used conversion method is called cracking because it uses heat and pressure to “crack” heavy hydrocarbon molecules into lighter ones. A cracking unit consists of one or more tall, thick-walled, bullet-shaped reactors and a network of furnaces, heat exchangers and other vessels. Fluid catalytic cracking, or “cat cracking”, is the basic gasoline-making process. Using intense heat, low pressure and a powdered catalyst (a substance that accelerates chemical reactions), the cat cracker can convert most relatively heavy fractions into smaller gasoline molecules. Hydrocracking applies the same principles but uses a different catalyst, slightly lower temperatures, much greater pressure and hydrogen to obtain chemical reactions. Cracking and coking are not the only forms of conversion. Other refinery processes, instead of splitting molecules, rearrange them to add value. Alkylation, for example, makes gasoline components by combining some of the gaseous byproducts of cracking. The process, which essentially is cracking in reverse, takes place in a series of large, horizontal vessels and tall, skinny towers that loom above other refinery structures. Reforming uses heat, moderate pressure and catalysts to turn naphtha, a light, relatively low-value fraction, into high- octane gasoline components.

Английский язык

Ответы

Альберт Луиза1595

Answer

Объяснение:

I have bought a house this year. - Я купил дом в этом году.

I have done the exercise, and now I can play football. - Я выполнил упражнение, и теперь я могу играть в футбол.

I have never eaten anything from McDonald's. - Я никогда не ел ничего из McDonald's.

My mom has lost her key. - Моя мама потеряла свой ключ.  

I have run away. - Я сбежал.

My friend and I have swum in this river already. - Мой друг и я уже плавали в этой реке.

Where is this exercise taken from? - Откуда взято это упражнение?

I have not won, but I am still happy. - Я не выиграл, но я все равно счастлив.

I have written the dictation well. - Я хорошо написал диктант.

sve34166163
Слово «праздник» происходит от слов «священный день». Первые праздники были религиозными. Сегодня же многие праздники не имеют ничего общего с религией. Почти в каждой стране есть праздники, которые отмечают важные события в ее истории.
Некоторые праздники имеют фиксированную дату, например, Новый год или Рождество, другие нет. Некоторые, например, Пасха, — переходные праздники.
Новый Год очень популярен во всем мире. Это и мой любимый праздник. Мы обычно собираемся все вместе. Мы любим отмечать этот праздник дома.
Мы празднуем Рождество 7 января. 6 января убирают дом, готовят много вкусных блюд потому что на следующий день работать нельзя, следует отдыхать. В этот день — Святой вечер (Сочельник). Он начинается с первой звездой, ведь легенда гласит, что эта звезда означает рождение Сына Божьего. Мы празднуем Рождество два дня. Вечером мальчики приходят щедровать. Они поют песни. Этими песнями они всех поздравляют с праздником, желают хорошего урожая, долгой жизни, здоровья. Интересно, что щедровать могут только мальчики.
8-го марта мы празднуем Женский День.
Потом 1 мая идет следующий праздник — День Труда.
Другой религиозный праздник — Пасха. У этого праздника нет фиксированной даты, она меняется. В России есть специальные атрибуты Пасхи: пасхальные яйца и пасхальные куличи («пасхи»). Пасха — очень хороший весенний праздник.
9 мая — День Победы. Это священный праздник для каждого российского гражданина. Мы благодарны нашим дедам за победу во второй мировой войн

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Составить 5 во к тексту As a raw product, crude oil is of limited use. Refineries must separate and process the mix of hydrocarbons which make up crude oil before they can be transformed into hundreds of useful products such as gasoline, diesel and jet fuels. The first and most important step is to separate it into various component or fractions. This takes place in a fractionating column, also known as an atmospheric distillation tower. This is a tall steel tower with perforated trays. Since each fraction has a different boiling range, a distillation tower is able to separate the various fractions using heat and cooling. Heavier hydrocarbons boil at much higher temperatures than lighter hydrocarbons. They settle in trays at the bottom of the tower closest to furnace. The lighter fractions collect at the top. Distillation is a continuous process which begins by heating crude oil in a furnace. Then it turns into a vapor. The vapor rises through perforations in the trays that are fitted with bubble caps. These caps force the vapor to pass through a previously liquefied fraction in the tray. This cools the vapor enough for it to shed that fraction. The remaining vapor repeats this process as it continues upwards. As each fraction reaches the tray where the temperature is just below its own boiling point, it condenses, liquefies and is drawn off the tray by pipes. A number of trays are needed to collect the liquids from each fraction. The products of distillation can be divided into four categories: 1 Gases and light gasoline The gases (methane, ethane, propane and butane) are commonly used to fuel refinery furnaces while the light gasoline is routed to gasoline blending. 2 Light distillates (naphta, kerosene) Naphta is used in the production of gasoline and petrochemicals. Kerosene is used as a jet fuel and stove oil 3 Middle distillates (light and heavy gas oils) Light gas oils are made into jet, diesel and furnace fuels. Heavy gas oils undergo further chemical processing such as cracking to produce naphta and other products. 4 Residual products Residual products are further processed to produce refinery fuels, heavy fuel oil, waxes, greases and asphalt. The next step is conversion. During this process fractions from distillation towers are transformed into streams (intermediate components) that eventually become finished products. The most widely used conversion method is called cracking because it uses heat and pressure to “crack” heavy hydrocarbon molecules into lighter ones. A cracking unit consists of one or more tall, thick-walled, bullet-shaped reactors and a network of furnaces, heat exchangers and other vessels. Fluid catalytic cracking, or “cat cracking”, is the basic gasoline-making process. Using intense heat, low pressure and a powdered catalyst (a substance that accelerates chemical reactions), the cat cracker can convert most relatively heavy fractions into smaller gasoline molecules. Hydrocracking applies the same principles but uses a different catalyst, slightly lower temperatures, much greater pressure and hydrogen to obtain chemical reactions. Cracking and coking are not the only forms of conversion. Other refinery processes, instead of splitting molecules, rearrange them to add value. Alkylation, for example, makes gasoline components by combining some of the gaseous byproducts of cracking. The process, which essentially is cracking in reverse, takes place in a series of large, horizontal vessels and tall, skinny towers that loom above other refinery structures. Reforming uses heat, moderate pressure and catalysts to turn naphtha, a light, relatively low-value fraction, into high- octane gasoline components.
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