A hydropyrolysis catalyst and a process using that catalyst are described. The catalyst comprises a support and an active metal component wherein the catalyst is an eggshell type catalyst having the active metal component located in the outer portion of the support.

A hydropyrolysis catalyst and a process using that catalyst are described. The catalyst comprises a support and an active metal component wherein the catalyst is an eggshell type catalyst having the active metal component located in the outer portion of the support.

The disclosure includes a process and a plant for separating a suspension C from a suspension A, wherein the fraction of particles P.sub.C in the suspension C, which have a diameter smaller than a defined limit grain diameter, is greater than in the suspension A by at least the factor of 2. The suspension A is introduced into a container extending from the bottom to the top and a suspension B is withdrawn from the container, whose fraction of particles with a diameter greater than the defined limit grain diameter is increased with respect to suspension A. Due to the fact that suspension C is withdrawn from the container in a second partial stream above the first partial stream, in that the flow velocity of the suspension C is greater than the sinking velocity of the particles P.sub.C contained therein, an effective separation can be achieved.

The disclosure includes a process and a plant for separating a suspension C from a suspension A, wherein the fraction of particles P.sub.C in the suspension C, which have a diameter smaller than a defined limit grain diameter, is greater than in the suspension A by at least the factor of 2. The suspension A is introduced into a container extending from the bottom to the top and a suspension B is withdrawn from the container, whose fraction of particles with a diameter greater than the defined limit grain diameter is increased with respect to suspension A. Due to the fact that suspension C is withdrawn from the container in a second partial stream above the first partial stream, in that the flow velocity of the suspension C is greater than the sinking velocity of the particles P.sub.C contained therein, an effective separation can be achieved.

The present invention provides a method for allowing a used inert material that has been subjected to a reaction once, which is disposed of in the background art, to be used again as well as a brand-new one. A method of recovering an inert material of the present invention is characterized by in the fixed-bed reactor, the inert material is loaded in an inert material layer provided between a first-stage catalyst layer and a second-stage catalyst layer, the first-stage catalyst layer is loaded with a first-stage catalyst for producing acrolein from propylene, and the second-stage catalyst layer is loaded with a second-stage catalyst for producing acrylic acid from acrolein, the method comprising the steps of: extracting the inert material from the fixed-bed reactor; washing the extracted inert material; and screening the washed inert material.

A hydropyrolysis catalyst and a process using that catalyst are described. The catalyst comprises a support and an active metal component wherein the catalyst is an eggshell type catalyst having the active metal component located in the outer portion of the support.

A hydropyrolysis catalyst and a process using that catalyst are described. The catalyst comprises a support and an active metal component wherein the catalyst is an eggshell type catalyst having the active metal component located in the outer portion of the support.

A method for separation of at least one catalyst or adsorbent from a homogeneous mixture of catalysts or adsorbents, used in a method for treatment of gas or hydrocarbon feedstock, in which the grains of catalysts or adsorbents are separated according to a sorting threshold corresponding to a content of the constituent element that is sought and defined by the user.

A method for separation of at least one catalyst or adsorbent from a homogeneous mixture of catalysts or adsorbents, used in a method for treatment of gas or hydrocarbon feedstock, in which the grains of catalysts or adsorbents are separated according to a sorting threshold corresponding to a content of the constituent element that is sought and defined by the user.

A method and a device for separation of at least one catalyst and/or adsorbent from a homogeneous mixture of catalysts and/or adsorbents containing one or more metal, semi-metal or non-metal contaminant(s) deposited thereon, making it possible to separate catalysts or adsorbents according to the presence or absence of contaminant and also according to the contaminant content, starting from a sorting threshold that corresponds to a content and that is defined by the operator.