摘要:
A method for the production of tetrahydrogeranylacetone is disclosed, whereby pseudoionone, geranylacetone and/or dihydrogeranylacetone in the liquid phase, in which particles of a catalyst, for the preferential hydrogenation of carbon-carbon double bonds before carbon-oxygen double bonds, are suspended, is fed through a device along in the presence of a gas comprising hydrogen, said device preventing the transport of the catalyst particles.
摘要:
A method for the production of tetrahydrogeranylacetone is disclosed, whereby pseudoionone, geranylacetone and/or dihydrogeranylacetone in the liquid phase, in which particles of a catalyst, for the preferential hydrogenation of carbon-carbon double bonds before carbon-oxygen double bonds, are suspended, is fed through a device along in the presence of a gas comprising hydrogen, said device preventing the transport of the catalyst particles.
摘要:
The invention relates to a method for continuously producing chromanol ester derivatives, particularly for continuously producing carboxylic acid esters of tocopherols and tocotrienols, by carrying out a continuous acylation with carboxylic acids or carboxylic acid anhydrides.
摘要:
The invention relates to a method for the hydrogenation of unsubstituted or at least monoalkyl substituted uni- or poly-nuclear aromatics by means of bringing the above at least one aromatic into contact with a gas containing hydrogen, in the presence of a catalyst comprising at least one metal of sub-group VIII of the periodic system as active metal, supported on a structured or monolithic support.
摘要:
The invention relates to a method for continuos distillative separation of mixtures containing tetrahydrofuran, η-butyrolactone and/or 1,4-butanediol into at least three fractions, wherein separation is carried out in an array of distillation columns containing at least one dividing wall column or at least one array of thermally-coupled conventional distillation columns.
摘要:
The invention relates to a method for producing 1,4-butanediol and possibly η-butyrolactone and tetrahydrofurane by oxidation of butane or benzol into a product flow containing maleic anhydride, absorption of maleic anhydride from the product flow by means of an inert, high-boiling solvent in an absorption stage, which yields a liquid absorption product, and esterification of said liquid absorption product with a C1-C5 esterification alcohol in an esterification step, yielding an esterification product containing the corresponding diester and high-boiling inert solvent. This is followed by hydrogenation of the esterification product, which results in an hydrogenation product containing the products 1,4-butanediol and optionally η-butyrolactone and tetrahydrofurane as well as the esterification alcohol. The hydrogenation product is separated by distillation into the products and the esterification alcohol and the esterification alcohol is returned to the esterification zone. Prior to hydrogenation the esterification product is separated by distillation under reduced pressured into the diester and the inert solvent, the inert solvent is returned to the absorption stage and the diester is hydrogenated in the liquid phase on a fixed-bed catalyst.
摘要:
The invention relates to a method for hydrogenating substituted or 5 unsubstituted mononuclear or multinuclear aromatics to form corresponding cycloaliphatics, especially benzole to form cyclohexane, by bringing the aromatic into contact with a gas containing hydrogen in the presence of a catalyst, using hydrogen containing residual gases.
摘要:
The invention relates to a method for producing cyclohexane dicarboxylic acids or derivatives thereof, e.g esters and anhydrides, wherein diene maleic acid anhydride mixtures, especially mixtures of butadiene maleic acid anhydrides or mixtures of maleic acid anhydride and C5 dienes, are reacted to form alkyl substituted or unsubstituted cyclohexene dicarboxylic acid anhydrides in a condensed phase; esters are formed and hydrogenation is carried out to obtain a corresponding cyclohexane dicarboxylic acid derivative. The invention also relates to the use of cyclohexane dicarboxylic acids or derivatives produced according to the inventive method as softeners for plastics. .
摘要:
The invention relates to a method for producing alkali methylates from an aqueous alkaline lye that is optionally mixed with methanol and methanol in a reaction column, said column comprising at least 5, preferably 15 to 30 theoretical trays between the inlet of the alkaline lye and the site of addition of the methanol. According to the inventive method, the vapor methanol-water mixture formed during the reaction is separated in a reaction column. According to an embodiment of the invention, the reaction column that is configured as a bubble-tray, valve-tray or sieve-plate column is provided with trays, each letting through maximally 5 %, preferably ≤ 1 % of the liquid. In another embodiment of the invention, the reaction column that is provided with a double jacket is configured as a column that is filled with fillers or oriented packings at a temperature in the double jacket that is 3 to 10 °C higher than the temperature in the inner of the column. In all sections of the column diameter that correspond to more than 2 % of the total column diameter, the average ratio of the liquid flow to the vapor flow with respect to the liquid is not exceeded by more than 15 %, preferably by not more than 3 %.
摘要:
The invention relates to a method for oxidizing an organic compound containing at least one C-C double bond or a mixture of two or more thereof, comprising the following steps: (I) production of a hydroperoxide; (II) reaction of an organic compound containing at least one C-C double bond or a mixture of two or more thereof with the hydroperoxide produced in step (I) in the presence of a zeolitic catalyst; (III) regeneration of the at least partially deactivated zeolitic catalyst used in step (II) and (IV) reaction according to step (II) using a zeolitic catalyst which contains the regenerated catalyst from step (III).