What are the stages of steam cracking?
The process shown in Figure 1 is a steam-cracking process for ethylene production from an ethane-propane mixture. The process can be divided into three main parts: cracking and quenching; compression and drying; and separation.
How does steam cracking work?
Steam cracking is a petrochemical process in which saturated hydrocarbons are broken down into smaller, often unsaturated, hydrocarbons. After the cracking temperature has been reached, the gas is quickly quenched to stop the reaction in a transfer line exchanger.
How do you process a flow diagram?
The 6 steps to making a business process flow diagram
- Determine the main components of the process.
- Order the activities.
- Choose the correct symbols for each activity.
- Make the connection between the activities.
- Indicate the beginning and end of the process.
- Review your business process diagram.
What is process with diagram?
A process diagram consists of activities, events, and gateways, which a sequence flow puts in a flow sequence. Activities, events, and gateways are summarized under the term flow object.
What pressure is used in steam cracking?
Since ethylene production is energy intensive, much effort has been dedicated to recovering heat from the gas leaving the furnaces. Most of the energy recovered from the cracked gas is used to make high pressure (1200 psig (8300 kPa)) steam.
Why is broken porcelain used in cracking?
As the porcelain chips are heated the vapour from the paraffin is ‘cracked’, or broken down into smaller hydrocarbons. Cracking them into smaller hydrocarbons makes them easier to use.
What is the difference between catalytic cracking and steam cracking?
Catalytic cracking uses a temperature of approximately 550°C and a catalyst known as a zeolite which contains aluminium oxide and silicon oxide. Steam cracking uses a higher temperature of over 800°C and no catalyst.