A process for preparing methanol from carbon dioxide and hydrogen in a methanol synthesis unit and working up the reaction mixture obtained stepwise to isolate the methanol, wherein the carbon dioxide, carbon monoxide, dimethyl ether and methane components of value from the streams separated off in the isolation of the methanol from the methanol reaction stream are combusted with an oxygenous gas, and the carbon dioxide in the resultant flue gas is separated off in a carbon dioxide recovery unit and recycled to the methanol synthesis unit.

The present disclosure relates to the technical field of hexanediol production, and provides a production method and a production device of high-purity 1,6-hexanediol. A dipic acid and a C.sub.6 mixed alcohol are mixed to conduct esterification to obtain a product feed liquid including an adipic acid diester, and the high-purity 1,6-hexanediol is obtained through hydrogenation reduction and distillation. In addition to being used as a reaction raw material, the C.sub.6 mixed alcohol further acts as a water-carrying agent; water produced by the esterification is removed by azeotropy, thereby promoting a smooth reaction process to realize the esterification without a catalyst. The method does not need the catalyst during esterification, and the subsequent hydrogenation reduction can be directly conducted with no complicated post-treatment procedure required after the esterification. In addition, the method has simple preparation steps, recyclable C.sub.6 mixed alcohol, less wastewater production, desirable environmental protection, and high product purity and yield.

The present disclosure relates to the technical field of hexanediol production, and provides a production method and a production device of high-purity 1,6-hexanediol. A dipic acid and a C.sub.6 mixed alcohol are mixed to conduct esterification to obtain a product feed liquid including an adipic acid diester, and the high-purity 1,6-hexanediol is obtained through hydrogenation reduction and distillation. In addition to being used as a reaction raw material, the C.sub.6 mixed alcohol further acts as a water-carrying agent; water produced by the esterification is removed by azeotropy, thereby promoting a smooth reaction process to realize the esterification without a catalyst. The method does not need the catalyst during esterification, and the subsequent hydrogenation reduction can be directly conducted with no complicated post-treatment procedure required after the esterification. In addition, the method has simple preparation steps, recyclable C.sub.6 mixed alcohol, less wastewater production, desirable environmental protection, and high product purity and yield.

A method for producing neopentyl glycol comprising a step of perforning a hydrogenation reaction by injecting a hydroxypivaldehyde (HPA) solution and hydrogen into a hydrogenation reactor, and a step of adjusting the content of H.sub.2O contained in the hydroxypivaldehyde solutionto 6.0% by weight or less before the hydroxypivaldehyde solution being injected into the hydrogenation reactor.

A method for producing neopentyl glycol comprising a step of perforning a hydrogenation reaction by injecting a hydroxypivaldehyde (HPA) solution and hydrogen into a hydrogenation reactor, and a step of adjusting the content of H.sub.2O contained in the hydroxypivaldehyde solutionto 6.0% by weight or less before the hydroxypivaldehyde solution being injected into the hydrogenation reactor.

A precious metal-supported eggshell catalyst with a preparation method and an application are provided. The precious metal-supported eggshell catalyst includes a carrier, a precious metal and a promoter. As an active component, the precious metal and the promoter are evenly distributed on surface of the carrier, wherein the promoter includes one or more than two of a precious metal, an alkaline earth metal, a transition metal lanthanide series metal, an actinium series metal and/or a metal oxide thereof. With a highly utilization of the precious metal, the precious metal-supported eggshell catalyst showed high conversion, good selectivity and excellent stability, and the precious metal-supported eggshell catalyst is used more than 300 hours with no obvious loss of activity in preparing 1,3-propanediol through hydrogenation of 3-hydroxypropionaldehyde aqueous solution. Furthermore, with large particles the precious metal-supported eggshell catalyst is easily separated from reaction products.

A precious metal-supported eggshell catalyst with a preparation method and an application are provided. The precious metal-supported eggshell catalyst includes a carrier, a precious metal and a promoter. As an active component, the precious metal and the promoter are evenly distributed on surface of the carrier, wherein the promoter includes one or more than two of a precious metal, an alkaline earth metal, a transition metal lanthanide series metal, an actinium series metal and/or a metal oxide thereof. With a highly utilization of the precious metal, the precious metal-supported eggshell catalyst showed high conversion, good selectivity and excellent stability, and the precious metal-supported eggshell catalyst is used more than 300 hours with no obvious loss of activity in preparing 1,3-propanediol through hydrogenation of 3-hydroxypropionaldehyde aqueous solution. Furthermore, with large particles the precious metal-supported eggshell catalyst is easily separated from reaction products.

Separation of carbon dioxide from the exhaust of an internal combustion engine, the production of hydrogen from water, and reformation of carbon dioxide and hydrogen into relatively high-octane fuel components.

Separation of carbon dioxide from the exhaust of an internal combustion engine, the production of hydrogen from water, and reformation of carbon dioxide and hydrogen into relatively high-octane fuel components.

The invention provides a process for producing methanol, which process comprises contacting H.sub.2 and CO.sub.2 with a solid catalyst, at a temperature of from 200° C. to 300° C. and at a reactant pressure of from 150 bar to 500 bar, which reactant pressure is the sum of the partial pressures of the H.sub.2 and the CO.sub.2, wherein: the molar ratio of the H.sub.2 to the CO.sub.2 is x:1.0, wherein x is from 2.5 to 3.5; and the catalyst comprises: (i) a copper component which is Cu, CuO or Cu.sub.2O, or a mixture of two or three thereof, and (ii) ZnO, wherein the catalyst has a specific copper surface area of at least 10 m.sup.2/g-catalyst.