羧酸对重油热反应的影响

以减压渣油、催化油浆和延迟焦化装置循环油及三者按一定比例配制的混合原料为对象，研究了羧酸对重油热反应的影响。分析了羧酸促进重油热裂解反应的机理，对混合原料热反应前后进行了FT-IR分析，并对混合原料沥青质进行了XPS分析。结果表明：混合原料中存在-C=O、-CHO、-COOH、-C-O-C-等含氧官能团；经过热反应后羧基和-C-O-C-发生分解反应；混合原料沥青质表面含有大量的C-O；羧酸能促进重油热反应中的裂化反应，抑制缩合反应，使重油热反应后的生焦率降低，液体收率升高；高酸重油生焦率高与重油酸含量高无关，仅由重油的胶质、沥青质含量等因素决定。

Effects of Carboxylic Acids on Thermal Cracking Reactions of Heavy Oils#br#

As the processing of acid-containing and high-acid crude oil increases, the effect of oxygenates on heavy oil processing is increasingly apparent. Taking vacuum residue, catalytic oil slurry and delayed coking unit circulating oil and the mixed feed prepared in a certain proportion as the research object, the effect of carboxylic acid on the thermal reaction of heavy oil was studied. The mechanism of carboxylic acid promoting thermal cracking reaction of heavy oil was analyzed. The FT-IR analysis was carried out before and after the thermal reaction of the mixed feed, and the mixed feed asphaltene were subjected to XPS analysis. The results show that there are oxygen-containing functional groups such as -C=O, -CHO, -COOH, -C-O-C in the mixed feed, and the decomposition reaction of carbonyl and -C-O-C after thermal reaction. Mixed feed asphaltene surface contains a large amount of C-O. Carboxylic acid can promote the cracking reaction in the thermal reaction of heavy oil, inhibit the condensation reaction, reduce the coke yield after heavy oil thermal reaction, and increase the liquid yield. The high coke yield of high acid heavy oil has nothing to do with the high acid content of heavy oil, and is determined only by other factors such as the gum content of the heavy oil and the asphaltene content.