摘要:
Disclosed is a process for the manufacture of dialkyl cyclohexanedicarboxylates by the low pressure, catalytic hydrogenation of the corresponding dialkyl benzenedicarboxylate wherein the formation/accumulation of carbon monoxide is suppressed to maintain the activity of the precious metal catalyst.
摘要:
Disclosed is a process for the preparation of a dimethyl cyclohexanedicarboxylate by the hydrogenation of the analogous dimethyl benzenedicarboxylate ester in the presence of a class of palladium on alumina catalysts which have a unique combination of characteristics. The use of the catalysts permits the process to be carried out at significantly lower process pressures.
摘要:
Disclosed is a process for recovering rhodium catalyst values from ''tars'' formed during the preparation of acetic anhydride by the rhodium catalyzed carbonylation of a mixture of methyl iodide and methyl acetate and/or dimethyl ether. The disclosed process provides a means for the recovery of rhodium values which normally are not extracted from the tars by treating a methyl iodide solution of such tars with certain oxidants.
摘要:
Disclosed are modified PET polymer compositions and process for making modified PET polymer compositions by reacting purified terephthalic acid and non-hydrogenated isophthalic acid with ethylene glycol. Compositions with acceptable visual appearance, such as clarity and color, can be made at typical modification levels for many packaging application. Disclosed are also shaped articles and the process for making shaped articles of the modified PET polymer composition.
摘要:
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is para-xylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.
摘要:
Processes for producing higher molecular weight ketones are disclosed that include the steps of feeding an aldol catalyst solution, a lower molecular weight aldehyde, and a lower molecular weight ketone, through a reactor provided with a solid hydrogenation catalyst and hydrogen gas; recovering a liquid reactor effluent containing the higher molecular weight ketone as a reaction product; and recycling a portion of the recovered liquid reactor effluent back through the reactor.
摘要:
Disclosed is an improved process for the continuous production ofaromatic carboxylic acids such as terephthalic acid by the liquid-phase oxidation of an alkyl aromatic compound using an oxygen-containing gas. Operation of the process is improved by providing a spray of recycled reaction medium at or near the top of a columnar oxidation vessel to minimize entrainment of liquid and/or solid components of the reactor in the process off-gas.
摘要:
Disclosed is a process for the preparation of a dimethyl cyclohexanedicarboxylate by the hydrogenation of the corresponding dimethyl benzenedicarboxylate ester in the presence of a class of supported catalysts comprising palladium and a second Group VIII metal selected from nickel, platinum, ruthenium or a mixture thereof deposited on an alumina support which have a unique combination of characteristics. The use of the catalysts permits the process to be carried out at significantly lower process pressures.