Regarding the butadiene content in catalytically liquefied gas

Generally, it is difficult to adjust the properties of a single component. Moreover, current gasoline standards require a reduction in the content of olefinic components, and the same applies to liquefied gas – there’s no other way but to increase certain values while decreasing others!

This requires the design and research of specialized catalysts tailored to the properties of the pyrolysis feedstock. Since catalytic cracking is a cracking reaction of hydrocarbons, the reaction products are influenced by factors such as the properties of the feedstock, the catalyst, and the operating conditions. It is extremely difficult to control the yield of a single component, and answers to this issue can only be found through very in-depth research into the catalytic mechanism. Since the main goal of the catalytic cracking process is to obtain lighter liquid hydrocarbons, namely light fuel oils, and fuel oils are mixtures of hydrocarbons, butadiene is not an important component among the cracking products. However, due to its conjugated structure, it is a relatively stable diene during the cracking process; its yield is low, but it is still produced.

Thank you very much. Although the yield is not high, after gas separation and the MTBE treatment process, the bromine content in the remaining liquefied gas increases. Downstream customers complain that the quality of the liquid is poor and require a bromine level of 0.2%, but the bromine content in our remaining C4 mixture remains around 0.5%.

It’s impossible to control the butadiene content with a catalytic device, right? Selective hydrogenation can remove dienes. An anti-autopolymerization agent can also be added to address the problem of butadiene autopolymerization.