摘要:
The present disclosure relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of a 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the presence of a ruthenium-promoted cobalt-based catalyst.
摘要:
The present invention relates to the production of 2,2,4,4-tetramethylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of 2,2,4,4-tetramethylcyclobutane-1,3-diol by hydrogenation of 2,2,4,4-tetramethylcyclobutane-1,3-dione in the presence of a cobalt-based catalyst.
摘要:
The present disclosure relates to the production of 2,2,4,4-tetraalkylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the presence of a promoted copper-based catalyst.
摘要:
The present disclosure relates to the production of 2,2,4,4-tetraalkylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the presence of a promoted copper-based catalyst.
摘要:
The present invention relates to the production of 2,2,4,4-tetramethylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of 2,2,4,4-tetramethylcyclobutane-1,3-diol by hydrogenation of 2,2,4,4-tetramethylcyclobutane-1,3-dione in the presence of a cobalt-based catalyst.
摘要:
The present disclosure relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of a 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the presence of a ruthenium-promoted cobalt-based catalyst.
摘要:
The present disclosure relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of a 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the presence of an iridium-promoted cobalt-based catalyst.
摘要:
The present disclosure relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol. In one embodiment, the present invention relates to the production of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of a 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the presence of an iridium-promoted cobalt-based catalyst.
摘要:
Disclosed are catalysts comprising copper chromite, palladium and lanthanum having hydrogenation activity. The combination of copper chromite with palladium and lanthanum enhances catalyst activity more than the presence of either palladium alone or palladium in combination with alkali or alkaline earth metals. The catalysts are useful for the preparation of methanol from carbon monoxide and hydrogen and for the hydrogenation of carbonyl compounds such as, for example, aldehydes, ketones, and esters, to their corresponding alcohols. The catalysts may be used for the preparation of cyclohexanedimethanols from dialkyl cyclohexanedicarboxylates or of ethylene glycol from alkyl glycolates.
摘要:
The present invention provides methods and an apparatus for the manufacture of an L-ascorbic acid product in high yield by direct conversion of an aqueous solution containing 2-keto-L-gulonic acid by contact with an acid catalyst or under thermal self-catalyzed conditions at a conversion level that maximizes the formation of L-ascorbic acid and minimizes decomposition of the L-ascorbic acid thus formed. The separation process for L-ascorbic acid and KLG is operated in such a way that an efficient separation process allows the majority of the KLG to be recycled for further conversion. The product stream from the separation process is then subjected to a recovery step to obtain crystalline L-ascorbic acid product.