Abstract
The catalytic cracking of the off-spec polyisoprene rubber thermolysis products over a mesoporous zeolite has been studied on a laboratory unit with a fixed-bed reactor. The effect of the reaction temperature and the feed space velocity on the feedstock conversion degree and the yield of gas and gasoline has been studied. The data obtained has shown that at rates below 2 h-1, a high gas generation and a low yield of liquid products are observed, while at rates above 3 h-1, the total yield of gas and gasoline decreases. In the course of the work, it has been noted that the reduction in conditional conversion occurs with an increase in the feed rate. The maximum yield of gasoline observed at a feed rate of 3 h-1 and amounted to 35.6 %, gas yield was inversely proportional to the feed rate, and the coke yield changed slightly. With an increase in the feed rate, the content of C3-C4in gas increases. To achieve high conversion or a high gasoline yield, the optimal feed rate should be 2 and 3 h-1, respectively. The products obtained in this process can be used as the motor fuel components.
Highlights
Catalytic cracking is one of the most important processes ensuring the deeper oil refining and increased yield of light fractions: high-octane gasoline and light gas oil
The conventional raw materials for catalytic cracking units are oil fractions boiling within 200550 °C [1], some units may process heavier materials [2, 3] such as vacuum gas oil, tar, fuel oil, hydrocracking residue, deasphaltizate, etc
Some catalytic cracking units using gasoline fractions as raw materials are aimed at producing light products [4]
Summary
Catalytic cracking is one of the most important processes ensuring the deeper oil refining and increased yield of light fractions: high-octane gasoline and light gas oil. The ever-growing production of polymeric materials leads to the growth of their waste at landfills that occupy large areas causing damage to the environment. This requires qualified processing and disposal of this waste [9], which has great environmental and economic significance. It is advisable to carry out the process in several stages: at the first stage, the feedstock is thermally cracked and further sent to the second-stage catalytic reactor and fractionated. It should be noted that many polymer feedstocks such as synthetic rubber and its production waste do not virtually contain sulfur and heavy metals negatively affecting the catalyst activity [15] that allows their environment-friendly processing. This issue has been considered on the example of polyisoprene rubber production waste
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