H-Bio

Key takeaways

H-Bio belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect H-Bio to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of H-Bio from memory before moving on to harder problems.

Reference excerpt

H-Bio is an oil-refining processes which involves converting vegetable oil into high-quality diesel via hydrogenation. Hydrogenation is a chemical reaction in which a substance is treated with hydrogen, resulting in a new product. In H-Bio, hydrogen is added to vegetable oil and mineral oil, making a usable diesel that is made up of diesel oil and 10% vegetable oil. The process was first developed in 2006 by the Brazilian state-owned gas company Petrobras, and was primarily established for commercial use. H-Bio can be used to power many cars that already use diesel, therefore it can be widely sold in fuel stations. The process has many advantages when compared to traditional methods, but also has drawbacks. H-Bio has been tested and confirmed as a viable method to supply diesel globally.

Process The procedure requires that the diesel pass through a hydrodesulfurization (HDS) chamber, which removes the majority of the sulfur content from the diesel. The hydrocarbons are broken up in a cracking unit, and the diesel is then mixed with HDS light cycle oil.

Hydrodesulfurization Diesel first passes through a distillation unit to undergo hydrodesulfurization. This is the process of removing sulfur from petroleum-based products by chemically combining it with hydrogen, resulting in hydrogen sulfide. Hydrogen and sulfur are combined in a hydrodesulfurization reactor, usually under the presence of a metal catalyst, where pressure is added to the bond and it is heated to temperatures ranging from 300 to 400 °C (572 to 752 °F), resulting in hydrogen sulfide molecules that are not included in the diesel.

Cracking The diesel is then passed through the cracking unit. This breaks up the hydrocarbons that make up the diesel into smaller sizes.

Mixing with HDS light cycle oil Next, the diesel is mixed with HDS light cycle oil (LCO). This is a poor diesel fuel due to its high sulfur content and poor engine ignition performance, thus it is mixed with H-Bio. The two are combined to produce the maximum amount of high-quality fuel from the given amount of supply. When LCO and H-Bio are blended, the fluid viscosity is modified for maximum performance, resulting in high-quality diesel. The resulting diesel has great ignition performance with very little sulfur content. Finally, the diesel is mixed with other components that do not require the hydrogenation process, and this mixture results in H-Bio.

Application H-Bio is compatible with any vehicle that already uses diesel as its main fuel source, without requiring modifications to the engine or transmission. Additionally, H-Bio can be sold to consumers in local fuel stations, unlike its counterpart, biodiesel.

Pros The main advantages of the H-Bio are that:

The process does not generate waste. No special efforts are needed to keep the diesel usable, such as separate storage. Cars that currently use diesel can use H-Bio without modification. The diesel has better ignition performance and a lower density. It is a higher-quality diesel with very little sulfur content. Compared to other methods, it therefore emits less sulfur dioxide, a main component of acid rain and a greenhouse gas. Drivers retain the same fuel economy as using diesel. The hydrogen used is recycled throughout the process. The vegetable oil used for the process can be from various sources, which can reduce the product's price.

Cons H-Bio also has drawbacks:

The high cost of the production process has created setbacks. In 2008, Petrobras stopped production because one barrel of H-Bio, produced from soy oil, cost $180; this compared to a regular diesel cost at the time of $104. Although the process releases less sulfur dioxide into the atmosphere, other potent greenhouse gases are released, such as carbon dioxide and water vapor. In the exhaust of a diesel engine, 2%-12% of emissions are carbon dioxide concentrations, and another 2%-12% are water vapor concentration.

Future outlook Petrobras filed for patents to the National Industrial Property Institute (Brazil) to mass-produce H-Bio and distribute it globally. Its short-term goal was to create two refineries and eventually expand to five refineries. It planned to test this process, with different types of vegetable oils, in other refineries.

References

External links http://www.petrobras.com.br/pt/

Worked examples

Example 1 — a first encounter with H-Bio

Start with the simplest possible case. Write down what H-Bio claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to H-Bio before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about H-Bio ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of H-Bio

In research: H-Bio appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses H-Bio in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: H-Bio is common in secondary-school and first-year university syllabi. It links to neighbouring topics Biofuels, so understanding it makes those chapters shorter.
In everyday life: Look for H-Bio outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study H-Bio in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what H-Bio means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain H-Bio out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is H-Bio in simple terms?

H-Bio is an oil-refining processes which involves converting vegetable oil into high-quality diesel via hydrogenation. Hydrogenation is a chemical reaction in which a substance is treated with hydrogen, resulting in a new product.

Why does H-Bio matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study H-Bio?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on H-Bio.