Ru-catalysed domino hydroformylation/hydrogenation/esterification using imidazole ligands.

The present disclosure provides a catalyst for use in a process for methyl acetate and acetic acid production from renewable methanol and synthesis gas. The catalyst comprises at least a metal as an active site for the vapor phase carbonylation reaction, including those from the group VIII and lanthanides series of the periodic table and could be alone or mixed. The support comprises an activated carbon with a high surface area.

The present disclosure provides a catalyst for use in a process for methyl acetate and acetic acid production from renewable methanol and synthesis gas. The catalyst comprises at least a metal as an active site for the vapor phase carbonylation reaction, including those from the group VIII and lanthanides series of the periodic table and could be alone or mixed. The support comprises an activated carbon with a high surface area.

A carbonylation-dehydration dual-functional catalyst precursor, a preparation method thereof, a carbonylation-dehydration dual-functional catalyst and use thereof are provided. The carbonylation-dehydration dual-functional catalyst precursor includes a modified silica-aluminum molecular sieve having an 8-member ring channel structure; a modified metal oxie loaded on the modified silica-aluminum molecular sieve having an 8-member ring channel structure by coupling, the coupling being performed using a silane coupling agent, wherein a modified component in the modified silica-aluminum molecular sieve having an 8-member ring channel structure includes at least one selected from the group consisting of copper oxide, zing oxide and iron oxide, and has a loading amount of 0.5-5 wt %, based on a metal mass of the modified component; and the modified metal oxie is prepared by modifying a composite metal oxide with an acid solution or an alkali solution, wherein the composite metal oxide is prepared based on a co-precipitation-calcination method.

A carbonylation-dehydration dual-functional catalyst precursor, a preparation method thereof, a carbonylation-dehydration dual-functional catalyst and use thereof are provided. The carbonylation-dehydration dual-functional catalyst precursor includes a modified silica-aluminum molecular sieve having an 8-member ring channel structure; a modified metal oxie loaded on the modified silica-aluminum molecular sieve having an 8-member ring channel structure by coupling, the coupling being performed using a silane coupling agent, wherein a modified component in the modified silica-aluminum molecular sieve having an 8-member ring channel structure includes at least one selected from the group consisting of copper oxide, zing oxide and iron oxide, and has a loading amount of 0.5-5 wt %, based on a metal mass of the modified component; and the modified metal oxie is prepared by modifying a composite metal oxide with an acid solution or an alkali solution, wherein the composite metal oxide is prepared based on a co-precipitation-calcination method.

A process for producing acetic acid includes: (a) reacting, via a catalytic partial oxidation (CPO) reaction, a CPO reactant mixture in a CPO reactor to produce a hydrogen-lean syngas; wherein the hydrocarbons include equal to or greater than about 3 mol % C2+ alkanes; wherein the hydrogen-lean syngas includes hydrogen, carbon monoxide, carbon dioxide, and unreacted hydrocarbons; and wherein the hydrogen-lean syngas is characterized by a hydrogen to carbon monoxide (H2/CO) molar ratio of from about 0.7 to about 1.3. Also included is (b) feeding at least a portion of the hydrogen-lean syngas and dimethyl ether (DME) to a DME carbonylation unit to produce methyl acetate and a hydrogen-enriched syngas characterized by a H2/CO molar ratio of from about 1.8 to about 2.2; and (c) feeding at least a portion of the methyl acetate and water to a methyl acetate hydrolysis reaction zone to produce acetic acid and a methanol stream.

A process for producing acetic acid includes: (a) reacting, via a catalytic partial oxidation (CPO) reaction, a CPO reactant mixture in a CPO reactor to produce a hydrogen-lean syngas; wherein the hydrocarbons include equal to or greater than about 3 mol % C2+ alkanes; wherein the hydrogen-lean syngas includes hydrogen, carbon monoxide, carbon dioxide, and unreacted hydrocarbons; and wherein the hydrogen-lean syngas is characterized by a hydrogen to carbon monoxide (H2/CO) molar ratio of from about 0.7 to about 1.3. Also included is (b) feeding at least a portion of the hydrogen-lean syngas and dimethyl ether (DME) to a DME carbonylation unit to produce methyl acetate and a hydrogen-enriched syngas characterized by a H2/CO molar ratio of from about 1.8 to about 2.2; and (c) feeding at least a portion of the methyl acetate and water to a methyl acetate hydrolysis reaction zone to produce acetic acid and a methanol stream.

A method for directly producing methyl acetate and/or acetic acid from syngas, carried out in at least two reaction zones, including: feeding a raw material containing syngas into a first reaction zone to contact and react with a metal catalyst; allowing an obtained effluent to enter a second reaction zone directly or after the addition of carbon monoxide so as to contact and react with a solid acid catalyst; separating the obtained effluent to obtain product of acetate and/or acetic acid, and optionally returning a residual part to enter the first reaction zone and/or the second reaction zone to recycle the reaction. By the method above, the product selectivity of the product of methyl acetate or acetic acid is greater than 93%, and the quantity of methyl acetate and acetic acid may be adjusted according to processing.

A method for directly producing methyl acetate and/or acetic acid from syngas, carried out in at least two reaction zones, including: feeding a raw material containing syngas into a first reaction zone to contact and react with a metal catalyst; allowing an obtained effluent to enter a second reaction zone directly or after the addition of carbon monoxide so as to contact and react with a solid acid catalyst; separating the obtained effluent to obtain product of acetate and/or acetic acid, and optionally returning a residual part to enter the first reaction zone and/or the second reaction zone to recycle the reaction. By the method above, the product selectivity of the product of methyl acetate or acetic acid is greater than 93%, and the quantity of methyl acetate and acetic acid may be adjusted according to processing.

Provided are a molecular sieve catalyst, a preparation method therefor, an application thereof. The molecular sieve catalyst contains a modified Na-MOR molecular sieve, and the modification comprises: organic ammonium salt exchange, dealumination treatment, and ammonium ion exchange. The catalyst obtained by the method is used in dimethyl ether for one-step production of methyl acetate. The catalyst has high activity and stable performance, and the needs of industrial production can be satisfied.