This document relates to oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and iron; oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and aluminum; and oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, iron, and aluminum.

A method for producing a multiphase mixed-oxide catalyst including at least one active phase based on bismuth molybdate and one co-catalyst based on iron molybdate and at least one amongst the two elements cobalt and nickel, includes the following steps:

preparing a mixture of the precursors of said-mixed oxides in a solvent,

making said precursors react through a microwave-assisted hydrothermal reaction, and

isolating the mixed oxides to obtain the catalyst.

A catalyst and a catalytic system prepared in this manner are related to the method as well as the uses of this catalyst and of this catalytic system, in particular in the oxidation of propene into acrolein.

A process for the production of formaldehyde from methanol comprising the steps of: feeding to a reactor a feed stream comprising the methanol and an oxygen-containing gas; reacting the methanol in the gas phase with the oxygen-containing gas in the reactor in the presence of a catalyst comprising oxides of iron and molybdenum; and recovering a formaldehyde reactor outlet stream from the reactor, the formaldehyde reactor outlet stream comprising formaldehyde and carbon monoxide. The catalyst comprises copper in an amount of at least 0.025 wt %, or at least 0.05 wt %, of the catalyst and in that the molar ratio of carbon monoxide to formaldehyde in the formaldehyde reactor outlet stream is at least 5% less than the molar ratio of carbon monoxide to formaldehyde in the formaldehyde reactor outlet stream in the same process using a catalyst containing essentially no copper.

The present invention has as its object the provision of a method for producing 1,3-butadiene capable of efficiently purifying an absorption solvent while a high productivity is assured.

A method for producing 1,3-butadiene includes: a step (A) of obtaining a produced gas containing 1,3-butadiene; a step (B) of cooling the produced gas; a step (C) of separating the produced gas, which has been subjected to the step (B); a step (D1) of separating the absorption solvent, that has absorbed an absorption component comprising the other gases containing 1,3 -butadiene into an absorption solvent that does not substantially contain the absorption component and an absorption solvent that contains the absorption component; a step (D2) of separating the absorption solvent that contains the absorption component into an absorption solvent that contains a reaction by-product and a 1,3-butadiene liquid; and a step (E) of purifying the absorption solvent, that contains the reaction by-product.

A process for the production of formaldehyde is disclosed. The process comprises feeding a feed stream comprising methanol to a reactor; converting the methanol to formaldehyde in the reactor using a mixed oxide catalyst to produce a process stream comprising formaldehyde; separating formaldehyde from the process stream to create a product stream comprising formaldehyde and a waste gas stream; feeding at least part of the waste gas stream to a steam condenser to raise the temperature of the at least part of the waste gas stream to create a heated waste gas stream; and feeding the heated waste gas stream to a catalytic combustion bed to catalytically combust components of the heated waste gas stream to create a combusted waste gas stream.

The invention relates to a method for producing butadiene from n-butenes having the steps: A) providing an n-butene-comprising feed gas stream a; B) feeding the n-butene-comprising feed gas stream a and an oxygen-comprising gas into at least one oxidative dehydrogenation zone and oxidatively dehydrogenating n-butenes to butadiene, wherein a product gas stream b comprising butadiene, unreacted n-butenes, steam, oxygen, low-boiling hydrocarbons, high-boiling minor components, optionally carbon oxides and optionally inert gases is obtained; Ca) cooling the product gas stream b by contacting it with a refrigerant and condensing at least a part of the high-boiling minor components; Cb) compressing the remaining product gas stream b in at least one compression step, wherein at least one aqueous condensate stream c1 and a gas stream c2 comprising butadiene, n-butenes, steam, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases is obtained; Da) separating off non-condensable and low-boiling gas components comprising oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases as gas stream d2 from the gas stream c2 by absorbing the C.sub.4 hydrocarbons comprising butadiene and n-butenes in an absorption medium, wherein an absorption medium stream loaded with C.sub.4 hydrocarbons and the gas stream d2 are obtained, and Db) subsequently desorbing the C.sub.4 hydrocarbons from the loaded absorption medium stream in a desorption column, wherein a C.sub.4 product gas stream d1 is obtained, Dc) separating off the steam condensate from the absorption medium in a phase separator and vaporizing it in a steam generator and providing it again as stripping gas in the desorption column,
wherein, the steam condensate before the vaporization in a steam generator, is subjected to a pretreatment in a further method step.

An object of the present invention is to provide a method for regenerating a catalyst for butadiene production, for removing a coke-like substance which is generated by oxidative dehydrogenation of n-butene in the presence of a catalyst for butadiene production and which is attached to the catalyst and the inside of a reactor. After the catalyst is used in oxidative dehydrogenation of butenes, the catalyst regeneration method of the present invention removes a coke-like substance in a reactor which is charged with the catalyst for butadiene production, the catalyst having a prescribed composition before being used in the oxidative dehydrogenation.

The invention relates to a method for producing butadiene from n-butenes having the steps: A) providing a feed gas stream a comprising n-butenes; B) feeding the feed gas stream a comprising the n-butenes and an oxygen-comprising gas into at least one oxidative dehydrogenation zone and oxidatively dehydrogenating n-butenes to butadiene, wherein a product gas stream b comprising butadiene, unreacted n-butenes, steam, oxygen, low-boiling hydrocarbons, high-boiling minor components, possibly carbon oxides and possibly inert gases is obtained; Ca) cooling the product gas stream b by contacting it with a refrigerant and condensing at least a part of the high-boiling minor components; Cb) compressing the remaining product gas stream b in at least one compression stage, wherein at least one aqueous condensate stream c1 and a gas stream c2 comprising butadiene, n-butenes, steam, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases are obtained; Da) separating off non-condensable and low-boiling gas components comprising oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases as gas stream d2 from the gas stream c2 by absorbing the C.sub.4 hydrocarbon-comprising butadiene and n-butenes in an absorbent, wherein an absorbent stream loaded with C.sub.4 hydrocarbons and the gas stream d2 are obtained, and Db) subsequent desorption of the C.sub.4 hydrocarbons from the loaded absorbent stream in a desorption column, wherein a C.sub.4 product gas stream d1 is obtained,
wherein a polymerization inhibitor is added in step Db) at the column head of the desorption column.

This document relates to oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and iron; oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and aluminum; and oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, iron, and aluminum.

The invention relates to a method for producing butadiene from n-butenes having the steps: A) providing an n-butene-comprising feed gas stream a; B) feeding the n-butene-comprising feed gas stream a and an oxygen-comprising gas into at least one oxidative dehydrogenation zone and oxidatively dehydrogenating n-butenes to butadiene, wherein a product gas stream b comprising butadiene, unreacted n-butenes, steam, oxygen, low-boiling hydrocarbons, high-boiling minor components, optionally carbon oxides and optionally inert gases is obtained; Ca) cooling the product gas stream b by contacting it with a refrigerant and condensing at least a part of the high-boiling minor components; Cb) compressing the remaining product gas stream b in at least one compression step, wherein at least one aqueous condensate stream c1 and a gas stream c2 comprising butadiene, n-butenes, steam, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases is obtained; Da) separating off non-condensable and low-boiling gas components comprising oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases as gas stream d2 from the gas stream c2 by absorbing the C.sub.4 hydrocarbons comprising butadiene and n-butenes in an absorption medium, wherein an absorption medium stream loaded with C.sub.4 hydrocarbons and the gas stream d2 are obtained, and Db) subsequently desorbing the C.sub.4 hydrocarbons from the loaded absorption medium stream in a desorption column, wherein a C.sub.4 product gas stream d1 is obtained, Dc) separating off the steam condensate from the absorption medium in a phase separator and vaporizing it in a steam generator and providing it again as stripping gas in the desorption column,
wherein, the steam condensate before the vaporization in a steam generator, is subjected to a pretreatment in a further method step.