thermal cracking

简明释义

热分解

英英释义

例句

1.Research indicates that thermal cracking 热裂解 can produce valuable byproducts like ethylene and propylene.

研究表明，热裂解可以产生有价值的副产品，如乙烯和丙烯。

2.The process of thermal cracking 热裂解 is essential in refining crude oil into usable fuels.

热裂解的过程对于将原油精炼成可用燃料至关重要。

3.During the thermal cracking 热裂解 process, large hydrocarbons are broken down into smaller molecules.

在热裂解过程中，大型碳氢化合物被分解成较小的分子。

4.The thermal cracking 热裂解 unit in the refinery operates at high temperatures to maximize output.

炼油厂的热裂解装置在高温下运行，以最大化产出。

5.Engineers are studying the effects of thermal cracking 热裂解 on different types of plastics.

工程师们正在研究热裂解对不同类型塑料的影响。

作文

Thermal cracking is a crucial process in the petroleum industry, primarily used to break down large hydrocarbon molecules into smaller, more useful ones. This method involves heating the crude oil at high temperatures, which causes the long chains of hydrocarbons to break apart. The significance of thermal cracking (热裂解) cannot be overstated, as it plays a vital role in producing gasoline, diesel, and other valuable fuels from heavy crude oil. The process of thermal cracking (热裂解) can be traced back to the early 20th century when the demand for lighter and more efficient fuels began to rise. As automobiles became more popular, the need for gasoline increased, prompting refiners to find ways to convert heavier oils into lighter fractions. This led to the development of various thermal cracking techniques, including the simple thermal cracking process and more advanced methods like visbreaking and coking.In simple thermal cracking, crude oil is heated to temperatures between 450 to 750 degrees Celsius in the absence of a catalyst. This high temperature helps to break the chemical bonds in the hydrocarbons, resulting in a mixture of lighter hydrocarbons and gases. The products of thermal cracking (热裂解) include alkenes, which are essential for producing plastics and other chemicals, as well as lighter fuels that are more suitable for engines.Visbreaking, on the other hand, is a milder form of thermal cracking (热裂解) that aims to reduce the viscosity of heavy oils without significantly altering their molecular structure. This process involves heating the oil to lower temperatures, typically around 400 degrees Celsius, which allows for a more controlled breakdown of the hydrocarbons. The primary goal of visbreaking is to produce a more fluid product that can be processed further in the refining process.Coking is another advanced technique related to thermal cracking (热裂解), where heavy residues from crude oil are subjected to high temperatures and pressures. This process not only produces lighter hydrocarbons but also generates petroleum coke, a solid carbon material that can be used in various industrial applications, such as in aluminum production or as a fuel source.Despite its advantages, thermal cracking (热裂解) has some drawbacks. The high temperatures required for the process can lead to the formation of unwanted byproducts, such as sulfur compounds and heavy metals, which can complicate the refining process and require additional treatment steps. Moreover, the energy-intensive nature of thermal cracking (热裂解) raises concerns about its environmental impact, particularly in terms of greenhouse gas emissions.In conclusion, thermal cracking (热裂解) is an essential process in modern petroleum refining that enables the conversion of heavy crude oil into valuable lighter products. As the world continues to seek more efficient and sustainable energy sources, advancements in thermal cracking (热裂解) technologies will play a critical role in meeting future energy demands while addressing environmental challenges.