What is the composition of the pyrolyzed ethylene when it enters the alkali scrubber?
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This post was last edited by lyn on 2010-4-1 15:24. What is the typical overall composition of the substances entering the alkali scrubber after the cracking of ethylene? Or where can I find it? I’ve looked for many books on ethylene but couldn’t find any. Thank you
There are many components: from hydrogen and methane to carbon 8, carbon 9, and carbon 10, as well as CO, CO2, and H2S. The alkali scrubber is used to remove acidic gases such as CO2 and H2S.
I want to know the typical distribution of all substances, such as what the H2 content is, what the methane content is, and so on
It depends on the type of device and the materials used; the various components differ from one another.
The distribution of the products depends on the feedstock used for cracking and the cracking conditions; an online chromatograph is required to determine the actual distribution. Additionally, the distribution of the product can be simulated using the Spyro software, but an online raw material analyzer is required for this.
The last edit to this post was made by j16119 on 2010-4-1 at 22:13. Taking naphtha as the raw material as an example: before entering the compressor, the pyrolysis gas passes through a quenching unit, where pyrolysis gasoline, heavy fuel oil, and light fuel oil are separated. The pyrolysis gas then enters a low-pressure stripping tower to separate the C4 components; therefore, what enters the alkali scrubbing tower is a small amount of components with four or more carbon atoms, mainly C2 and C3 components, along with a small amount of methane and trace amounts of hydrogen, as well as carbon dioxide and hydrogen sulfide
H2O H2 CH4 CO CO2 H2S C2H2 C2H4 C2H6 MAC PPD C3H6 C3H8 VAC C4H6 C4H8 C4H10 C5-cyclodiene Benzene C6 non-aromatics Toluene C7C8 non-aromatics Styrene Xylene Ethylbenzene **Styrene; those in bold indicate higher concentrations
Could you provide the typical content levels for these components? Thank you. I have a general idea of the components, but now I want to know the exact amounts, which of course depends on the raw materials used. I would like to ask everyone for the composition and content under certain raw material conditions.
Volume fraction: H2O 0.36%, H2 0.7%, CH4 12.69%, CO 0.17%, CO2 0.02%, H2S 0.08%, C2H2 0.4%, C2H4 36%, C2H6 8%, MAC PPD 0.8%, C3H6 16.3%, C3H8 0.4%, VACC4H6, C4H8 7.2%, C4H10 6%, C5 cyclodiene 1.8%, benzene 3.6%, C6 non-aromatics 0.72%, toluene 0.72%, C7C8 non-aromatics 0.36%, styrene, xylene, ethylbenzene; **ethylene in trace amounts; approximate values