Veba-Chemie Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Huels Aktiengesellschaft

Wilhelm Heitmann

August Sommer

Rainer Brucker

Wilhelm Ester, Deceased

Hans-Werner Michalczak

Gerd Bohmholdt

Peter Kirchner

Wolfgang Ester, Heir

Brigitte Louis Nee Ester, Heir

By Brigitte Lovis, Nee Ester, Heir

By Wolfgang Ester, Heir

Norbert Wozny

Margarete Ester, Heir

A method for recovering ammonia and organic compounds from offgases contaminated with organic materials, carbon dioxide, and ammonia, using a combined absorption and rectification column is disclosed. Carbon dioxide is washed out with aqueous alkali, ammonia is drawn off as an overhead product, and the organic compounds are recovered in pure form from the bottoms product following separation-out of the alkali carbonate.

Method of recovering ammonia and compounds from offgases contaminated

A continuous multistage process for the preparation of (cyclo)aliphatic diisocyanates comprising a) condensing urea with a (cyclo)aliphatic diamine in the presence of an alcohol solvent to make a (cyclo)alkylenebisurea in a distillation reactor; b) reacting the crude (cyclo)alkylenebisurea with alcohol in a pressurized distillation reactor to make (cyclo)biscarbamate; c) removing the ammonia formed in the pressurized distillation reactor; d) cleaving the (cyclo)biscarbamate in the presence of a catalyst in a combined cleavage and rectifying column to make crude (cyclo)alkylene diisocyanate; e) reacting a diverted portion of the cleavage products with the alcohol to form a recycling mixture; f) and distilling the crude (cyclo)alkylene diisocyanate formed in step d.

Continuous multi-stage process for the preparation of (cyclo) aliphatic

A distillation process for the production of dehydrated ethanol from dilute aqueous solutions of ethanol characterized in that the distillation is performed in a two-column system wherein the first column--for rectification--is operated under such a pressure that the second column--for dehydration--is heated exclusively with the vapors of the first column; in the first column the concentration of the dilute aqueous ethanol is effected to an ethanol concentration below the composition of the binary ethanol-water azeotrope; the separation of water is effected from the lower layer of the condensed head product of the second column; the separation of impurities and entrainers, having a lower boiling point than ethanol, is effected at the head of the first column and that of impurities, having a higher boiling point, above the feed point of the dilute aqueous solution in the first column; and, in the second column, the dehydration is effected by means of entrainers, with the addition of a fuel component or fuel, to which the ethanol is to be added, if required, while separating the aqueous phase as a head product.

Distillation process for the production of dehydrated ethanol

A method for producing a carrier for a catalyst comprising the steps of mixing solutions of a soluble salt of aluminum and a soluble salt of silicic acid in a ratio that gives a precipitate comprising aluminum silicate having a weight ratio of Al.sub.2 O.sub.3 :SiO.sub.2 of 1:5 to 1:7, forming the precipitate into a carrier body, consolidating the carrier body by heating, and contacting the carrier body with an acid to reduce the Al.sub.2 O.sub.3 content to 1-5%. Thus produced carrier bodies are useful for catalyzing the hydration of olefins to alcohols when impregnated with phosphoric acid.

Method for producing a catalyst for the hydration of olefins

A method is disclosed of preparing alcohols having 2 to 4 carbon atoms by catalytic hydration of the corresponding olefins on acid catalysts at elevated temperature and elevated pressure, characterized in that byproducts of the hydration, namely corresponding ethers and/or low-polymerized hydrocarbons and/or undesired alcohols, which form upon the passage of the input product through catalyst bed, are fed to the input product before entry into the reactor, said method being characterized in that:

Method of preparing alcohols having two to four carbon atoms by

A method for producing a catalyst comprising phosphoric acid and a carrier, for the hydration of olefins with 2-3 carbon atoms to the corresponding alcohols, the method comprising:

Method of producing a catalyst from clay minerals for the hydration of

A process for the hydration of olefins to prepare alcohol is disclosed, the hydration being effected in the presence of a phosphorus acid-containing catalyst. There is disclosed a process in which vaporized phosphoric acid is admixed with a gas mixture before the same is added to the reactor, the phosphoric acid being in an amount corresponding to the amount of phosphoric acid discharged during the hydration. In such amount the process can be carried out without further phosphoric acid addition.

Hydration of olefins using vaporized phosphoric acid

Improvement in the known process for producing organic cyclic hydroperoxides, which process includes oxidizing a compound of the formula ##STR1## wherein Ar is an aromatic or saturated cycloaliphatic radical and each R is an aliphatic hydrocarbon radical or a hydrogenated bicyclic terpene hydrocarbon hydroperoxide with an oxygen-containing gas at a temperature of about 80.degree.-150.degree. C under a pressure of about atmospheric up to about 10 atms., wherein the product, when produced by this process, has an improved activity on the catalysis of olefin polymerization if the oxidation reaction is halted at the point where the produced hydroperoxide has a concentration in the reaction mass of about one to less than 5%.

Preparation of organic hydroperoxides

Pure C.sub.1 -C.sub.3 alkanols are prepared from crude water containing alcohols in a continuous distillation process which includes an extractive distillation zone into which water and crude alcohols are introduced and from which is removed an impurities stream and a dilute aqueous alcohol stream; an alcohol concentration zone into which is introduced a dilute alcohol stream from the extractive distillation zone from which is withdrawn pure concentrated alcohols, a low boiling impurities stream and a high boiling impurities stream; and an impurities concentration zone into which is introduced the impurities stream from the extractive distillation zone and the high and low boiling impurities streams from the alcohol concentration zone from which is withdrawn high and low boiling impurities and an alcohol containing stream which is recycled to the extractive distillation zone with the crude alcohols. Aqueous alkali solution is injected into the alcohol concentration zone above the point at which the high boiling impurities stream is withdrawn and below the point from which pure concentrated alcohols are withdrawn. In addition, the sump product from the alcohol concentration zone is discarded or neutralized and recycled to the upper portion of the extractive distillation zone.

Growing community of inventors

Herne, Germany

Wilhelm Heitmann