The method for cleaning a reactor of the present invention comprises passing a solvent through a wax-fraction hydrocracking apparatus which is charged with a catalyst and to which supply of a wax fraction is stopped, wherein the solvent comprising at least one oil selected from a group consisting of hydrocarbon and vegetable oils, and having a sulfur content of less than 5 ppm and being in a liquid state at 15 C.

The method for cleaning a reactor of the present invention comprises passing a solvent through a wax-fraction hydrocracking apparatus which is charged with a catalyst and to which supply of a wax fraction is stopped, wherein the solvent comprising at least one oil selected from a group consisting of hydrocarbon and vegetable oils, and having a sulfur content of less than 5 ppm and being in a liquid state at 15 C.

A method for producing a dicyclopentadiene-modified phenolic resin. The method including reusing a fluorine-based ion-exchange resin as a catalyst in a reaction between a phenol and a dicyclopentadiene, the fluorine-based ion-exchange resin having been used as a catalyst when a phenol and a dicyclopentadiene are allowed to react with each other to produce a first dicyclopentadiene-modified phenolic resin. In the method, the fluorine-based ion-exchange resin is washed with an organic solvent. The dicyclopentadiene-modified phenolic resin obtained by the method has a stable quality, has a high purity, and is inexpensive.

Disclosed are novel processes for making cyclohexanone compositions, from a mixture comprising phenol, cyclohexanone, and cyclohexylbenzene. The process includes hydrogenation of a feed stream comprising phenol, cyclohexanone, and cyclohexylbenzene. The feed stream may be subjected to one or more pre-hydrogenation treatments, such as passing through one or more sorbents, addition of basic chemical agents, and/or addition of water, so as to improve catalyst activity, minimize undesired side reactions, and/or remove catalyst poisons from the feed stream. The feed stream may be provided to a hydrogenation reaction zone in the vapor phase, with periodic alterations to hydrogenation reaction conditions such that the feed is provided in mixed liquid and vapor phase in order to carry out liquid washing of a hydrogenation catalyst bed within the hydrogenation reaction zone.

Disclosed herein are methods for recovering phosphorus-containing ligand from mixtures comprising organic mononitriles and organic dinitriles, using liquid-liquid extraction. Also disclosed are treatments to enhance extractability of the phosphorus-containing ligand.

Disclosed herein are methods for recovering phosphorus-containing ligand from mixtures comprising organic mononitriles and organic dinitriles, using liquid-liquid extraction. Also disclosed are treatments to enhance extractability of the phosphorus-containing ligand.

Compositions and methods for the removal of hydrogen sulfide, vapor phase thiols, carbonyl sulfide, and combinations thereof, from gas/vapor streams are provided through the utilization of a regenerable formulated media. The compositions may include a bound complex treated-activated carbon media (BCT-AC media). The compositions and methods provide advantages over current known technologies by reducing the number of required process steps and resulting reduction in capital and operating costs, as well as elimination of aqueous phase processes that are expensive to operate and generate unwanted waste by products. Additionally, the compositions and methods provided remove hydrogen sulfide as recoverable elemental sulfur and are ideally suited for gas/vapor phase applications where carbon dioxide may be present as it has no process or economic impact on the compositions or methods.

Compositions and methods for the removal of hydrogen sulfide, vapor phase thiols, carbonyl sulfide, and combinations thereof, from gas/vapor streams are provided through the utilization of a regenerable formulated media. The compositions may include a bound complex treated-activated carbon media (BCT-AC media). The compositions and methods provide advantages over current known technologies by reducing the number of required process steps and resulting reduction in capital and operating costs, as well as elimination of aqueous phase processes that are expensive to operate and generate unwanted waste by products. Additionally, the compositions and methods provided remove hydrogen sulfide as recoverable elemental sulfur and are ideally suited for gas/vapor phase applications where carbon dioxide may be present as it has no process or economic impact on the compositions or methods.

The present invention relates to a method for reactivating an anthraquinone hydrogenation catalyst for the preparation of hydrogen peroxide, comprising at least one step of bringing said catalyst into contact with an aqueous solution comprising ammonia. The invention also relates to the use of an aqueous ammonia solution for reactivating an anthraquinone hydrogenation catalyst for the preparation of hydrogen peroxide.

The present invention relates to a method for reactivating an anthraquinone hydrogenation catalyst for the preparation of hydrogen peroxide, comprising at least one step of bringing said catalyst into contact with an aqueous solution comprising ammonia. The invention also relates to the use of an aqueous ammonia solution for reactivating an anthraquinone hydrogenation catalyst for the preparation of hydrogen peroxide.