Cradle to Gate
Identity ID
f9b18a24-3347-44ea-bcc2-419f0ad030f5
Materials
Associated ID
2c449ca5-8d68-4110-afbe-c9e91bc4563a
Included activities starts
Included activities ends
Description
Crude pyrolysis gasoline is mainly used in aromatics extraction and hydrofining systems, and can be further used to produce benzene, toluene, xylene and high-value-added chemical raw materials. The dataset contains the main raw and auxiliary materials, energy, waste and atmospheric emissions of the production process, in which the preliminary treatment of wastewater in the auxiliary units and the waste gas treatment process are included within the dataset boundary, and infrastructure such as the manufacture of production equipment and the construction of plant buildings is not included within the dataset boundary; the data inventory is formed by merging data from multiple sources; the production activities of this product include feedstock cracking, separation and waste heat recovery; the dataset contains multiple products, allocated by mass.
Activity Description
The production activities of this product include raw material cracking, separation, waste heat recovery and other processes.
Process Description
Crude cracked gasoline is a liquid hydrocarbon fraction produced by a steam cracking unit. It is mainly composed of unsaturated hydrocarbons in the C5-C9 range, aromatic hydrocarbons and a small amount of paraffins. The typical characteristics are high aromatic potential, high olefin content, density and distillation range within the gasoline range. This material is usually a light yellow to brown liquid with obvious volatility, and the risks of polymerization and oxidation during storage and transportation need to be controlled. Crude pyrolysis gasoline is mainly used in aromatic hydrocarbon extraction and hydrorefining systems to further produce benzene, toluene, xylene and high value-added chemical raw materials.
Time period
2016
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
This dataset models a feedstock mix of naphtha, propane, and liquefied petroleum gas. At 800-900°C in a cracking furnace, longer-chain saturated hydrocarbons are broken down into shorter unsaturated compounds. The main products include ethylene and propylene, with hydrogen, mixed C4 hydrocarbons, and other co-products. Cracking-unit designs are broadly similar and require only minor modifications for local conditions. Naphtha remains the principal feedstock, although the shares of light components such as propane and butane and liquid feedstocks such as liquefied petroleum gas have increased in recent years. A portion of the by-product fuel gas is used in the cracking furnaces.
1. Cracking: Feedstocks entering the plant are preheated, mixed with dilution steam, and heated before cracking in the radiant section of the furnace. Liquid-feed furnaces use highly selective radiant coils for high-severity cracking, while gas-feed furnaces use multi-pass coils. Cracked gas is sent to the downstream separation section. Both liquid- and gas-feed furnaces are bottom-fired.
2. Separation: Heat is recovered from the cracked gas in a waste-heat boiler, after which the gas serves as stripping medium in the gasoline fractionator. The fractionator bottoms leave the plant as crude fuel oil, while the overhead stream is quenched in a quench-water tower and sent to compression. The demethanizer bottoms are sent to the deethanizer, and the deethanizer overhead enters an acetylene converter, where acetylene is selectively hydrogenated to ethylene and ethane.