Study on Performance of Wax Warm Mix Asphalt Cracked by Mixed Polyethylene Waste Plastics

In order to study the modified performance of polyethylene waste plastic cracking wax on asphalt, this paper prepared polyethylene wax (PE wax) by catalytic cracking using waste polyethylene as raw material and Ni-based zeolite as catalyst in a pressure reactor under closed conditions. 70# base asphalt was modified with PE wax, and the properties of pyrolysis wax on asphalt under different catalytic cracking time were studied by three indexes test, Brinoll rotary viscosity test, DSC test and dynamic shear rheology test. The test results show that the cracking products of mixed polyethylene waste plastic cracking wax have good viscosity reduction effect on asphalt under different cracking time. After modification, the high temperature performance of asphalt is improved, and the low temperature performance has a certain influence, but it still meets the specification requirements; In the temperature range of 0°C~60°C, the addition of pyrolysis wax can make the phase transformation of matr-ix asphalt more stable.

CATALYTIC CRACKING OF HEAVY OIL OF ALIF FIELD – MARIB- YEMEN

The study presents the results of the catalytic cracking process of heavy oil of the Alif – Marib field in Yemen. The best conditions of the process, pressure, temperature, and using zeolite HZSM-5 as catalyst were selected. Based on the characteristics of the heavy oil, the analyses were done using a gas chromatography technique and catalytic cracking unit designed in the laboratory of Chemical Engineering and Petrochemical faculty at Al-Baath University- Syria., refining process was done in Refining Company- Homs. The results of simple distillation of the cracking products at different range of temperature were (Gasoline= 19.5%; Kerosene=15%; Light gas oil= 36%; Distillate residue= 29.5%) and gases (CH4= 67.55 %; C2H4= 14.66 %; C2H6= 7.48 %; H3H8= 9.24%; C4H10=1.06 %). Extraction by sulfuric acid was done. An 84.044% oil-free aromatic has been gotten. In order to remove total paraffins from the oily cut that has a high pour point, different solvents were used. The properties of the oily cut from which the paraffin wax was removed gave encouraging results.

Experimental Evaluation of Hydrotreated Vegetable Oils as Novel Feedstocks for Steam-Cracking Process

Hydrotreated vegetable oils (HVOs) are currently a popular renewable energy source, frequently blended into a Diesel-fuel. In the paper, HVO potential as feedstock for the steam-cracking process was investigated, since HVOs promise high yields of monomers for producing green polymers and other chemicals. Prepared HVO samples of different oil sources were studied experimentally, using pyrolysis gas chromatography to estimate their product yields in the steam-cracking process and compare them to traditional feedstocks. At 800 °C, HVOs provided significantly elevated ethylene yield, higher yield of propylene and C4 olefins, and lower oil yield than both atmospheric gas oil and hydrocracked vacuum distillate used as reference traditional feedstocks. The HVO preparation process was found to influence the distribution of steam-cracking products more than the vegetable oil used for the HVO preparation. Furthermore, pyrolysis of HVO/traditional feedstock blends was performed at different blending ratios. It provided information about the product yield dependence on blending ratio for future process design considerations. It revealed that some product yields exhibit non-linear dependence on the blending ratio, and therefore, their yields cannot be predicted by the simple principle of additivity.

The Effect of Pre-Ozonation of Natural Bitumen on the Rate of Cracking Reactions

The effect of bitumen ozone-oxygen mixture pretreatment followed by cracking on thermolysis processes was investigated. Pretreatment of natural bitumen allowed to intensify the process of destruction of high-molecular components of raw materials, the content of which decreased by 8–15% wt. In the resulting liquid cracking products, oils predominate from 70 to 80% wt. Based on the formalized model of the thermal transformation of high-molecular components of the raw material, the rate constants of the bitumen thermolysis reactions (k) and the effect of pretreatment of the ozoneoxygen bitumen mixture on the cracking reactions are calculated