Intratec Chemical Process Library is the first free online encyclopedia of chemical process technologies. Our Library covers not only processes description themselves, but also the economics surrounding chemicals production, providing real-world knowledge on the production of several chemical commodities. Click here to check all chemicals covered.
In this page you will find free data about Butadiene, including:
- What is Butadiene
- How to make Butadiene
- Butadiene uses and applications
This page presents brief synopsis of Butadiene production technology, describing, in a concise way, relevant technical and economic aspects. Each manufacturing process description will consist of:
- Major process steps
- Simplified, schematic flow diagram & key equipment
- Important safety or environmental considerations
- Economic perspective, comprising capital expenditures and/or operating expenses
Extracting 1,3-Butadiene from a C4 Stream
The organic compound 1,3-butadiene is a petrochemical commodity used as a raw material for the production of rubbers and plastics, such as polybutadiene rubber (PR), styrene butadiene rubber (SBR), and acrylonitrile butadiene styrene (ABS). These materials are mainly applied in themanufacture of automotive parts, tires and cables. Also, 1,3-butadiene is used as an intermediate in the manufacture of several chemicals, such as adiponitrile, the raw material for nylon production.
1,3-Butadiene is generally recovered from C4 streams that are generated as byproducts of ethylene manufacture by naphthabased steam cracking. These C4 mixtures are composed mostly of butadiene and butenes, with smaller amounts of butanes and acetylenes. To obtain the 1,3-butadiene product stream, it must be extracted from the C4 mixture. This can be accomplished using several technologies, such as separation by solvent extraction.
The process depicted in the diagram below is similar to BASF’s process for butadiene extraction using aqueous N-methylpyrrolidinone (NMP) as a solvent.
The C4 mixture containing butadiene, butenes, butanes and acetylenes is fed to the first extractive column, where recycled NMP solvent is added to the top section. The column overhead stream, which consists of butanes and butenes (raffinate-1), is sent to storage. The bottom stream, containing butadiene, acetylenes and some butenes absorbed in NMP, is fed to the top of the rectifier column. In this column, remaining butenes are separated in the top stream and recycled to the first extractive column, while the bottoms stream, containing mainly NMP, is sent to the degassing section. Butadiene and some acetylenes are separated as a side stream of the rectifier column, which is fed to the second extractive column. There, recycled NMP solvent is added to the top to absorb the acetylenes, which are recovered in the bottoms and returned to the rectifier column. Crude butadiene is recovered in the overheads and sent to the butadiene-purification section.
In this section, the crude butadiene stream is fed to the propyne column...
An economic evaluation of the process was conducted, taking into consideration a unit processing a C4 stream to produce 100,000 ton/yr of 1,3-butadiene erected on the U.S. Gulf Coast ...