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Studies on Thermal Cracking and Catalytic Cracking Reactions during Catalytic Cracking Process

机译：催化裂化过程中热裂化和催化裂化反应的研究

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The thermal cracking reactions lead to excessive light gas yield and lower overall product values I during the present mode of commercial high-temperature FCC operation. Catalyst properties and operating parameters (reaction temperature, catalyst-to-oil ratio, contact time) have great influence on thermal and catalytic cracking reactions. Catalytic cracking reaction dominates below around 540 ℃, and the ratio of (C_1+C_2)/i-C_4 is less than 0.6. When the reaction temperature exceeds around 610 ℃, thermal cracking reaction is the key process and the ratio of (C_1+C_2)/i-C_4 is greater than 1.2. The rate of catalytic cracking reaction can increase with an increase in the catalyst to oil ratio relating to more amounts of active sites involved. The deposition of product coke on the catalyst arising from a severer thermal cracking reaction makes the active sites inaccessible for future participation in the catalytic cracking cycle. The short contact time of oil and catalyst may suppress the detrimental thermal cracking reaction dramatically.
机译：在商业高温FCC操作的当前模式期间，热裂解反应导致过量的轻质气体产率和较低的总产物值I。催化剂的性质和操作参数（反应温度，催化剂与油的比例，接触时间）对热裂解和催化裂解反应有很大影响。催化裂化反应在540℃以下占主导地位，（C_1 + C_2）/ i-C_4之比小于0.6。当反应温度超过610℃时，热裂解反应是关键过程，（C_1 + C_2）/ i-C_4之比大于1.2。催化裂化反应的速率可以随着涉及更多活性位点的催化剂与油的比率的增加而增加。由于剧烈的热裂化反应而产生的产物焦炭在催化剂上的沉积，使得活性位点不可接近，以供将来参与催化裂化循环之用。油和催化剂的短接触时间可以显着抑制有害的热裂解反应。

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