| Patent Number |
Title Of Patent |
Date Issued |
| 6951967 |
Process for the preparation of tertiary alcohols by the hydration of tertiary olefins in a react |
October 4, 2005 |
| Tertiary alcohols can be prepared by the hydration of tertiary olefins having the same number of carbon atoms on an acidic ion exchanger using special structured multi-purpose packings for heterogeneous reactive rectification. An excellent yield and purity of the alcohol and an exten |
| 6074982 |
Catalyst agent for etherifying, hydrogenating and isomerizing crude . C.sub4 -C.sub.8 - hyd |
June 13, 2000 |
| A catalytic agent for etherifying, hydrogenating and isomerizing crude C.sub.4 -C.sub.8 -- hydrocarbon mixtures having a sulfur content, comprising a macroporous or gel cation exchanger having SO.sub.3 H groups and being charged with a mixture of a metal selected from the group consi |
| 5969205 |
Process for preparing C.sub.4 --C.sub.6 --alkenes having an internal double bond comprising recy |
October 19, 1999 |
| C.sub.4 -C.sub.6 -alkenes having an internal double bond can be produced by hydroisomerization of C.sub.4 -C.sub.6 -alkenes having a terminal double bond in the presence of H.sub.2 on a catalyst having a content of a noble metal of group VIII of the Periodic Table of the Elements (Mendel |
| 5789643 |
Process for oligomerizing I-butene comprising hydroisomerizing portion of condensate and recycli |
August 4, 1998 |
| The i-butene present in a C.sub.4 raffinate I is subjected in a first step to a first hydroisomerization. The hydroisomerization product is subjected to fractional distillation, with essentially 2-butene and n-butane being obtained as bottom product and i-butene and i-butane being obtain |
| 5378668 |
Process for reactivating ammoxidation catalysts |
January 3, 1995 |
| Molybdenum/bismuth-based fluid-bed catalysts which are used for the ammoxidation of olefins can be reactivated by addition of a mixed oxide of formulawherein, besides Mo, one element from component group (P, Cr) and one or more metals from component group (Bi, Ni, Fe, Co) are present, an |
| 5141732 |
Process for the removal of ammonium sulphate from tarrich waste streams from the production of ( |
August 25, 1992 |
| The ammonium sulphate contained in tar-rich waste streams from the production of (meth)acrylonitrile can be precipitated out by adding 1 to 30 times the amount by weight of methanol, relative to the water content of the waste stream, and additionally 0.05 to 10% the amount by weight of |
| 5141525 |
Process for producing high-octane, low-olefin motor fuels and motor fuel components |
August 25, 1992 |
| High-octane, low-olefin motor fuels and motor fuel components having a content of alkyl tert.-alkyl ethers can be produced by reacting a crude hydrocarbon stream, which contains tertiary C.sub.5 -C.sub.8 -olefins in addition to saturated and olefinically, diolefinically and acetylenicall |
| 5095164 |
Process for cleaving alkyl tert.-alkyl ethers |
March 10, 1992 |
| Alkyl tert.-alkyl ethers can be cleaved into the underlying alkanols and tert.-olefins in the presence of strongly acidic substances in a column apparatus, the strongly acidic substance being made available at the foot of the column. A particularly advantageous process design results whe |
| 5091093 |
Process for purifying acrylonitrile effluent |
February 25, 1992 |
| The effluent arising in the production of acrylonitrile can be purified by adjusting it to a pH value from 4 to 9 and then subjecting it to reverse osmosis at a membrane at a temperature from 10.degree. to 50.degree. C. and a differential pressure of 10 to 80 bar. The flow velocity at th |
| 5008466 |
Process for the isomerization of alkenes having a terminal double bond to give alkenes having an |
April 16, 1991 |
| Alkenes having a terminal double bond can be isomerized to give alkenes having an internal double bond if alkenes having a terminal double bond or hydrocarbon feedstock having a content of alkenes of this type having a terminal double bond are subjected to treatment, in the presence of |
| 4960961 |
Process for the preparation of tert.-amyl alcohol (TAA) |
October 2, 1990 |
| Tert.-Amyl alcohol (TAA) can be prepared in an advantageous manner by hydrating of i-amylenes on an acid cation exchanger by carrying out the reaction in the vicinity of the boiling point of the i-amylenes under the appropriate reaction pressure. A higher content of TAA is thereby obtain |
| 4950820 |
Process for the hydrogenation of olefinic hydrocarbons in hydrocarbon mixtures containing tert.- |
August 21, 1990 |
| Olefinic hydrocarbons present in mixtures containing tert.-alkyl alkyl ethers and, if appropriate, other saturated aliphatic or aromatic hydrocarbons can be hydrogenated with substantial preservation of the ethers if the catalyst used has an active component for hydrogenation on a ca |
| 4910046 |
Paint resin and its use for powder coating |
March 20, 1990 |
| A paint resin for powder coating is described which consists of modified high-pressure polyethylene (LDPE) and is characterized by(a) a content from 0.1 to 1 mol %, based on the total number of moles of all monomers, of unsaturated carboxylic acids present as copolymerized units, and/or |
| 4856985 |
Device for feeding gases into combustion chambers and process for diminishing pollutants during |
August 15, 1989 |
| The invention relates to a device for feeding gases, aerosols and/or mixtures of gases and solids into the combustion of a steam boiler or other combustion chambers using heat, and a process for diminishing pollutants, which are formed when burning gases, aerosols and/or mixtures of |
| 4804704 |
Crosslinked organic resins containing SiO.sub.2 and sulphonic acid groups |
February 14, 1989 |
| Crosslinked organic resins, containing SiO.sub.2 and sulphonic acid groups, having an SiO.sub.2 content of 0.1-10% by weight, relative to the total weight of the SiO.sub.2 -containing resins, are prepared by steeping crosslinked organic resins, containing sulphonic acid groups, in the |
| 4751343 |
Process for the preparation of tertiary olefins |
June 14, 1988 |
| Tertiary olefins are obtained in pure form by cleavage of the pertinent tert.alkyl ethers with simultaneous formation of the pertinent alcohols on strongly acidic cation exchangers in the H.sup.+ form. This cleavage is carried out at elevated temperature and atmospheric to superatmosphe |
| 4712434 |
Device for emission-free sampling of volatile liquids |
December 15, 1987 |
| A device for emission-free sampling of volatile liquids comprises a 4-way tap from which lead two lines, which can be connected together, from and to the container holding the liquid to be tested and two other lines, which can also be connected together, lead to a sample bottle which can |
| 4655798 |
Process for removing acetylene from a C.sub.2 -stream |
April 7, 1987 |
| Acetylene is removed from a crude C.sub.2 -stream by scrubbing with an absorbent in an absorption column, a liquid, substantially acetylene-free C.sub.2 -stream being fed into the absorption column between the feed points for the crude C.sub.2 -stream and for the absorbent. |
| 4504688 |
Process for the preparation of pure alkyl tert-alkyl ethers and hydrocarbon raffinates which are |
March 12, 1985 |
| A process for the preparation of pure alkyl tertiary alkyl ethers and hydrocarbon raffinates which are substantially free from tertiary olefins and alkanols. An alkanol and a hydrocarbon mixture containing at least one tertiary olefin are contacted with the alkanol being present in a |
| 4503265 |
Process for the production of methyl tert.-butyl ether (MTBE) and of hydrocarbon raffinates subs |
March 5, 1985 |
| In the reaction of methanol and of i-butene which is contained in a hydrocarbon mixture on an acid cation exchange material to give methyl tert.-butyl ether (MTBE), methanol and i-butene can be used in essentially equimolar amounts if simultaneously to the distillative separation of the |
| 4431528 |
Process for the hydrogenation of hydrocarbons |
February 14, 1984 |
| Unsaturated hydrocarbons and mixtures in which the latter are present are treated with anion exchangers prior to hydrogenation and are then hydrogenated catalytically in a known manner. The treatment with anion exchangers is carried out at 0.degree.-120.degree. C. and at a space velo |
| 4409421 |
Process for the preparation of pure tert.-olefins |
October 11, 1983 |
| Pure tert.-olefins are prepared from mixtures of hydrocarbons, which contain at least one such tert.-olefin, by reaction with an alkanol to give the corresponding alkyl tert.-alkyl ethers, and subsequent cleavage of these ethers back to the corresponding pure tert.-olefins and the al |
| 4405500 |
Halogen compound promoted Al.sub.2 O.sub.3 and/or SiO.sub.2 for the preparation of isoalkenes |
September 20, 1983 |
| n-Alkenes can be converted catalytically into isoalkenes, when a mixture containing at least one n-alkene and hydrogen is brought into contact at a temperature of 400.degree. to 600.degree. C. and a residence time of 0.2 to 20 seconds with an Al.sub.2 O.sub.3 or SiO.sub.2 catalyst which |
| 4400308 |
Silver-containing supported catalysts and catalyst intermediate products, processes for their pr |
August 23, 1983 |
| Silver-containing supported catalyst, catalyst intermediates, processes for their preparation and the use of such catalysts in the preparation of alkaline oxides is described. By the preparatory technique of the invention there is obtained an improved catalyst which is especially use |
| 4377393 |
Process for the preparation of a mixture consisting essentially of iso-butene oligomers and meth |
March 22, 1983 |
| A fuel for a carburetor type engine consisting essentially of isobutene oligomers and methyl tert.-butyl ether, said fuel prepared by a process comprising:(a) in a first step contacting a mixture of straight chain and branched butanes and butenes with an acid catalyst whereby to oligomer |
| 4371725 |
Process for the preparation of tertiary olefins and n-alkanols |
February 1, 1983 |
| Process for the preparation of tertiary olefins by catalytic cleavage of their n-alkyl ethers at elevated temperature and with simultaneously recovery of the corresponding n-alkanols, characterized in that the cleavage is carried out in the presence of acidic molecular sieves, which |
| 4349416 |
Process and device for the separation of mixtures which form an azeotrope |
September 14, 1982 |
| A process and apparatus for the separation of components from a mixture which forms an azeotrope is disclosed by subjecting the mixture to extractive distillation to remove one of the components and regeneration to separate another component from the extracting agent added to the ext |
| 4330679 |
Process for the preparation of alkyl tert.-alkyl ethers |
May 18, 1982 |
| In a process for the preparation of an alkyl tert.-alkyl ether by reaction of an isoolefin branched at the double bond and an alkanol in the presence of a cation exchanger, the improvement which comprises:(a) Employing as the cation exchanger a macroporous or gelatinous acid cation excha |
| 4328382 |
Process for separating off olefins from gases containing olefins |
May 4, 1982 |
| An improved process for the absorption of an olefin in a silver salt solution and the recovery thereof by desorption is disclosed wherein the silver salt of the silver salt solution is silver trifluoroacetate. |
| 4297512 |
Process for the preparation of triethylamine |
October 27, 1981 |
| An improved process for the preparation of triethylamine by gas phase catalytic hydrogenation of acetonitrile is disclosed, the improvement residing in employing as the catalyst a supported noble metal of Group VIII of the periodic system catalyst where the support comprises lithium |
