Disclosed herein are embodiments of aryl compounds and polymers thereof that are made using methods that do not require harsh conditions or expensive reagents. The methods disclosed herein utilize precursor compounds that can be polymerized to form polycyclic aromatic hydrocarbons and polymers, such as carbon-based polymers like nanostructures (e.g., graphene or graphene-like nanoribbons).

Disclosed herein are embodiments of aryl compounds and polymers thereof that are made using methods that do not require harsh conditions or expensive reagents. The methods disclosed herein utilize precursor compounds that can be polymerized to form polycyclic aromatic hydrocarbons and polymers, such as carbon-based polymers like nanostructures (e.g., graphene or graphene-like nanoribbons).

The present invention relates to a process for the continuous production of nitrobenzene by the nitration of benzene with nitric acid and sulphuric acid under adiabatic conditions, not the entire production plant being shut down during a production stop, but the production plant being entirely or at least partly operated in recirculation mode. The invention further relates to a plant for producing nitrobenzene and to a method for operating a plant for producing nitrobenzene.

The present invention relates to a process for the continuous production of nitrobenzene by the nitration of benzene with nitric acid and sulphuric acid under adiabatic conditions, not the entire production plant being shut down during a production stop, but the production plant being entirely or at least partly operated in recirculation mode. The invention further relates to a plant for producing nitrobenzene and to a method for operating a plant for producing nitrobenzene.

The present invention discloses a cobalt compound of formula (I), a process for the preparation and use thereof. The present invention further relates to a pharmaceutical composition and a method inhibition of Tau Aggregation in a subject in need thereof using compound of formula (I). ##STR00001##

A nitration reactor (10) incorporating sections of downward flow for use in preparing nitrated organic compounds. It comprises a first vertically-oriented reactor section (12), a second vertically-oriented reactor section (14), a connecting section (16) between the two reactor sections, one or more inlets (20, 22) for introducing nitration reactants into the reactor, an outlet (24) for the removal of nitration reaction products, a vertically-downward flowpath (26) for the nitration reactants in one of the reactor sections or the connecting section, and operating conditions that produce a flow regime in the vertically-downward flowpath that is a dispersed flow regime or a bubbly flow regime. The invention overcomes the limitations of prior art nitration reactors of the type in which fluids flow largely in a vertically upward direction, with respect to hydrostatic demands and plant layout considerations.

A nitration reactor (10) incorporating sections of downward flow for use in preparing nitrated organic compounds. It comprises a first vertically-oriented reactor section (12), a second vertically-oriented reactor section (14), a connecting section (16) between the two reactor sections, one or more inlets (20, 22) for introducing nitration reactants into the reactor, an outlet (24) for the removal of nitration reaction products, a vertically-downward flowpath (26) for the nitration reactants in one of the reactor sections or the connecting section, and operating conditions that produce a flow regime in the vertically-downward flowpath that is a dispersed flow regime or a bubbly flow regime. The invention overcomes the limitations of prior art nitration reactors of the type in which fluids flow largely in a vertically upward direction, with respect to hydrostatic demands and plant layout considerations.

Highly efficient nanosized mesoporous CuMgAl ternary oxide catalysts are provided.

Highly efficient nanosized mesoporous CuMgAl ternary oxide catalysts are provided.

The present invention relates to zeolite adsorbents based on agglomerated zeolite X crystals comprising barium, potassium and sodium. These adsorbents find applications in the separation of aromatic C8 isomer fractions and especially xylene.