【Daily Question】1.22 Quinoline insolubles in hydrogenation (Reply with +1 wealth automatically)

Effect of quinoline insolubles on hydrogenation (reaction) catalyst d

It will deactivate the catalyst, cause clogging of the catalyst bed, and increase the pressure drop in the bed

If there is a high amount of insoluble matter, it can also cause the catalyst bed to become clogged, increasing the pressure drop across the bed.

Coal tar pitch is a by-product of tar refining; it is a mixture of various complex compounds, most of whose polymer components have 6 or more rings, with hundreds of isomers present. Therefore, when studying asphalt, it is necessary to abandon the method of separating each compound individually and adopt other viable methods instead. One of these approaches is to use the distributed leaching method to separate coal tar pitch into various components, to relate the properties of these components to those of the treated coal tar pitch, and to study the relationship between them and the manufacturing processes as well as the quality of carbon products; certain patterns have been identified in this process. In our country, toluene and quinoline are commonly used as solvents to separate coal tar pitch into components such as toluene-soluble substances (TS), toluene-insoluble substances (TI), toluene-insoluble and quinoline-soluble substances (β-resin, TI-QS), and quinoline-insoluble substances (QI). The specific procedure involves first using toluene for extraction to obtain the toluene-soluble fraction (TS); the insoluble fraction (TI) is then separated using quinoline as a solvent, yielding the toluene-insoluble and quinoline-soluble fraction (β-resin, TI-QS) as well as the quinoline-insoluble fraction (QI).