Aromatic hydrocarbon

About: Aromatic hydrocarbon is a research topic. Over the lifetime, 5814 publications have been published within this topic receiving 55499 citations. The topic is also known as: arene & arenes.

Sulfur production process

Abstract: A process is provided for the removal of trace amount of aromatic hydrocarbons from a waste feed gas stream comprising sulfur compounds and the aromatic hydrocarbons. An adsorption process employing an adsorbent such as a high silica zeolite adsorbent having a framework silica to alumina ratio greater than about 15 and having a pore size greater than about 6.2 Angstroms is used to remove from the feed gas mixture aromatic hydrocarbon contaminants and permit the recovery of a high purity sulfur product from the treated effluent stream. The adsorption zone comprises at least 2 adsorption beds wherein one of the first adsorption beds is operating in an adsorption mode and the other is being regenerated at a desorption pressure higher than the adsorption pressure. The regeneration is performed in a closed system or partially closed system, and prior to returning a regenerated adsorption zone to adsorption conditions the waste feed gas stream is used to cool and purge the regenerated zone. Purge effluent from the regeneration zone is passed to a bed undergoing adsorption in a lead/trim configuration to prevent a slug of aromatic hydrocarbons from entering the adsorption effluent. The use of the present invention removes aromatic hydrocarbon contaminants which are responsible for the degeneration of the performance of the downstream sulfur recovery zone.

Phenol-free and chlorinated hydrocarbon-free photoresist stripper comprising surfactant and hydrotropic aromatic sulfonic acids

Abstract: Stripping solutions, free from phenol and chlorinated hydrocarbon compounds, comprising a surfactant alkylarylsulfonic acid having 12-20 carbons, a hydrotropic aromatic sulfonic acid having 6-9 carbons and a halogen-free aromatic hydrocarbon solvent with a boiling point above 150° C. The stripping compositions effectively remove organic polymeric substances from inorganic substrates and are substantially clear water rinsable.

Acetylenic polymers, trimers thereof and the production thereof

Abstract: A polymer having one of the general formulae ##EQU1## and ##EQU2## wherein Ar1, Ar2, Ar3, Ar4, Ar5, Ar6, Ar8, Ar9 and Ar10 are the same or different bivalent aromatic hydrocarbon radicals containing six to ten carbon atoms, Ar7 is a trivalent aromatic hydrocarbon radical containing 6 to 10 carbon atoms, and n is 30 to 120.

Relationships of quantum mechanical calculations, relative mutagenicity of benzom anthracene diol epoxides, and “bay region” concept of aromatic hydrocarbon carcinogenicity

Abstract: Evidence supporting the conclusion that 7,8‐dihydroxy‐9,10‐epoxy‐7,8,9,10‐tetra‐hydrobenzo[a]pyrenes are ultimate mutagenic and carcinogenic forms of benzo[a]‐pyrene (BP) is summarized. Quantum mechanical calculations that predict reactivity of diol epoxides derived from BP and other polycyclic aromatic hydrocarbons are described. The calculations predict that diol epoxides in which the oxirane ring forms part of a “bay region” of a tetrahydrobenzo ring should be the most reactive for a given aromatic hydrocarbon. Experiments with dihydrodiols and diol epoxides from benzo[a]anthracene (BA) are described. The ability to metabolically activate BA 3,4‐dihydrodiol to species much more mutagenic than those obtained from other BA dihydrodiols and the much greater mutagenicity of the diastereoisomeric 3,4‐diol‐1,2‐epoxides of 1,2,3,4‐tetrahydro BA relative to other diol epoxides of BA are in accord with predictions of the quantum mechanical calculations.