The present invention relates to a molding catalyst and a method for producing the same, wherein the molding catalyst is used in the Deacon process for commercial production of chlorine using hydrogen chloride oxidation reaction, exhibits only a small reduction in catalytic activity even when exposed to harsh reaction conditions to thus be durable, and has superb mechanical strength to be suitable for use in a fixed bed catalytic reactor.

The invention relates to a method for producing isocyanates and optionally polyurethanes by at least: synthesising (1) phosgene (20) from carbon monoxide (21) and chlorine (22); reacting (2) phosgene (20) with diamines (23) to form diisocyanates (24) and hydrogen chloride (25); providing a carbon dioxide gas flow (31); and cleaning (4) the carbon dioxide gas flow (31) of additional components, wherein the carbon dioxide is converted by means of an RWGS reaction (6) to form carbon monoxide (21) and hydrogen (29), which are used as raw materials for the polyurethane production, as well as optionally reacting (3) the diisocyanates (24) with polyether polyol (35a) and/or polyester polyol (35b) to form polyurethanes (37).

A molding catalyst satisfying the following formula (1):

0.800≤W.sub.AV/W.sub.C≤0.875  (1) wherein W.sub.AV is determined by the following formula (2) and W.sub.C is determined by the following formula (3):

W.sub.AV=W.sub.tot/n  (2) wherein W.sub.tot is a total weight of freely-selected n pieces of the molding catalyst,

W.sub.C=(V.sub.AV.Math.ρ)/(1+V.sub.P.Math.ρ)  (3) wherein V.sub.AV is an average of volumes of virtual cylinders each respectively having, as its height and diameter, a major axis (L) and a minor axis (D) of each of the freely-selected n pieces of the molding catalyst, ρ is a true density of the molding catalyst, and V.sub.P is a pore volume per unit weight of the molding catalyst.

A molding catalyst satisfying the following formula (1):

0.800≤W.sub.AV/W.sub.C≤0.875  (1) wherein W.sub.AV is determined by the following formula (2) and W.sub.C is determined by the following formula (3):

W.sub.AV=W.sub.tot/n  (2) wherein W.sub.tot is a total weight of freely-selected n pieces of the molding catalyst,

W.sub.C=(V.sub.AV.Math.ρ)/(1+V.sub.P.Math.ρ)  (3) wherein V.sub.AV is an average of volumes of virtual cylinders each respectively having, as its height and diameter, a major axis (L) and a minor axis (D) of each of the freely-selected n pieces of the molding catalyst, ρ is a true density of the molding catalyst, and V.sub.P is a pore volume per unit weight of the molding catalyst.

A catalyst for halogen production for oxidizing a hydrogen halide with oxygen to produce a halogen, the catalyst for halogen production including 4% or less by volume of water with respect to a pore volume of the catalyst for halogen production while the catalyst is encapsulated in a package, and the package encapsulating therein the catalyst for halogen production for oxidizing a hydrogen halide with oxygen to produce a halogen, wherein the catalyst for halogen production includes 4% or less by volume of water with respect to a pore volume of the catalyst for halogen production.

A catalyst for halogen production for oxidizing a hydrogen halide with oxygen to produce a halogen, the catalyst for halogen production including 4% or less by volume of water with respect to a pore volume of the catalyst for halogen production while the catalyst is encapsulated in a package, and the package encapsulating therein the catalyst for halogen production for oxidizing a hydrogen halide with oxygen to produce a halogen, wherein the catalyst for halogen production includes 4% or less by volume of water with respect to a pore volume of the catalyst for halogen production.

The present invention relates to a method for producing a molding catalyst for obtaining chlorine (Cl.sub.2) through an oxidation reaction of hydrogen chloride (HCl), and more specifically, to a method for producing an oxidation reaction molding catalyst by adding heterogeneous material to a ruthenium oxide (RuO.sub.2)-supported catalyst having titanium oxide (TiO.sub.2) as a supporting body, and molding so as to be usable in a fixed bed reactor to produce chlorine (Cl.sub.2) from hydrogen chloride (HCl).

A method for preparing chlorine gas through catalytic oxidation of hydrogen chloride is carried out by one-time hydrogen chloride feeding and multi-stage oxygen feeding, one-time oxygen feeding and multi-stage hydrogen chloride feeding, or both, returning a product gas stream without separation thereof, and optionally carrying out heat insulation means. In the present invention, excessive reaction heat concentration is prevented, therefore, the method of the present invention is a chlorine gas recovery method implemented through the Deacon catalytic oxidation of hydrogen chloride that may be industrialized.

A method for preparing chlorine gas through catalytic oxidation of hydrogen chloride is carried out by one-time hydrogen chloride feeding and multi-stage oxygen feeding, one-time oxygen feeding and multi-stage hydrogen chloride feeding, or both, returning a product gas stream without separation thereof, and optionally carrying out heat insulation means. In the present invention, excessive reaction heat concentration is prevented, therefore, the method of the present invention is a chlorine gas recovery method implemented through the Deacon catalytic oxidation of hydrogen chloride that may be industrialized.

The present invention relates to a catalyst for producing chlorine by oxidation of hydrogen chloride and a method for preparing the same. The catalyst comprises a support and active ingredients that comprise 1-20 wt % of copper, 0.01-5 wt % of boron, 0.1-10 wt % of alkali metal element(s), 0.1-15 wt % of one or more rare earth elements, and 0-10 wt % of one or more elements selected from magnesium, calcium, barium, manganese, iron, nickel, cobalt, zinc, ruthenium or titanium based on the total weight of the catalyst. The catalyst is prepared by a two-step impregnation method. Comparing with the available catalysts of the same type, the catalyst according to the present invention has greatly improved conversion and stability.