The method for increasing the stripping capacity of the stripping column is to increase the crude aldehyde feed temperature; increase the syngas feed flow rate; and increase the syngas feed temperature.
Through technological transformation, the amount of syngas feed is increased from that, that is, the syngas feedstock participating in the oxo synthesis reaction is all used as the stripping gas of the stripper. The syngas feed temperature is increased, and the crude aldehyde feed temperature is also improved. The reformed stripper works well, the stripping capacity is greatly improved, and the propylene and propane dissolved in the crude butyraldehyde can be substantially completely stripped. The top no longer has a flow indicating that there is no flow in the flow meter. After the transformation, the gas composition of the stable overhead gas is shown in the table. After the transformation, the gas composition of the stable gasification tower is stabilized. The stable top-top compressor is shut down, and the steam volume of the stabilizer tower reboiler is reduced from the original to save a large amount of steam. And electric energy, saving operating costs (steam, electricity, maintenance costs, spare parts, etc.) up to 10,000 yuan per year. The comparison of the operating parameters before and after the transformation is shown in the table. Comparison of the operating parameters before and after the transformation. Crude aldehyde feed synthesis gas synthesis gas bottom temperature temperature tower top temperature stability top temperature feed amount feed temperature venting flow transformation before transformation from the table It can be seen that after the reformation, the stripper is in good working condition and the stripping capacity is greatly improved.
The reason for the remodeling of the n-butyraldehyde column and the design of the recombination in the raffinate such as the terpolymer and tetramer of butyraldehyde, and the phosphide (mainly triphenylphosphine and its degradation products) will affect the normality of the hydrogenation catalyst. Used, these materials have a high molecular weight and a high viscosity.
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