Solvent extraction of nitrogen compounds from catalytically cracked diesel oil was studied by using a volatile carboxylic acid, such as acetic acid. The complexes of nitrogen compounds with acetic acid could be thermally decomposed, yielding nitrogen compounds and the volatile acid for recycle. Catalytically cracked diesel oil from Shengli Petrochemical Corporation was used as feed oil. Nitrogen compounds, especially basic nitrogen compounds, were effectively separated with aqueous acetic acid solution by solvent extraction based on chemical complexation. The stability of catalytically cracked diesel oil was greatly improved. Experimental conditions for the separation of nitrogen compounds were investigated. The recovery of catalytically cracked diesel oil was quite high, and chemicals were not consumed, avoiding pollution of environment. The new method sees a promising potential in industry.

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The effects of oxygen pressure, temperature, catalyst loading, and particle size of the catalyst support on the cooxidation reaction of mixed thiols were studied systematically in gas−liquid−solid systems. The results have shown that the pore diffusional resistance is the main factor limiting the reaction and the overall cooxidation reaction kinetics is zero order in oxygen and first order in mercaptan. The diffusion-controlled rate law can be represented as r = k obs C RSH. A discussion is presented for the industrial sweetening operation based on the research.