How to improve liquefied gas yield
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This post was last edited by ghostlg on 2021-3-20 at 10:00. 720 How to increase the liquefied gas yield. Background: Coaxial catalytic cracking unit, pressure regeneration at 0.16, settling pressure at 0.13, outlet pressure of the riser at 510; the current yield of liquefied gas is around 14%, and currently only the catalyst-to-oil ratio can be adjusted to improve this figure
But most people would probably choose to replace the additives instead.
1. Amount of propylene additive to be added: At the current normal addition level, the octane rating of gasoline and the yield of liquefied gas increase significantly, while the yield of gasoline decreases. Increasing the amount of propylene additive further will lead to an increase in the volume of dry gas, affecting the load on the compressors and the absorption units; as a result, the yield of gasoline will decline. It is recommended to maintain the current addition level. 2. Catalyst micro-reactivity: The catalyst’s micro-reactivity remains around 60. Due to the high content of heavy metals in the raw materials, and considering the amount of catalyst used per unit volume, the total amount of heavy metals in the catalyst stays at a high level, which affects the catalyst’s activity. Increasing the amount of catalyst used helps to boost its activity, thereby enhancing its ability to crack diesel and improving the yields of gasoline and liquefied gas. 3. Reaction temperature: Increasing the reaction temperature raises the reaction rate and accelerates thermal cracking; as a result, the reaction rate of gasoline converting to gas increases, which in turn boosts gas yield while reducing gasoline yield. The productive LPG production scheme features operation conditions characterized by \"one short and three highs\", namely: short reaction time, high reaction temperature, high catalyst activity, and high catalyst-to-oil ratio.
Increase the reaction temperature, enhance catalyst activity, or replace the additive
Why can a shorter reaction time produce more liquefied gas?