Matches 51 - 82 out of 82 < 1 2
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4723016 Preparation of anhydrous organic acid salts  
One-step process for preparing anhydrous, organic acid alkali or alkaline earth metal salts by contacting and reacting an organic or polymeric acid fluoride, anhydride or ester and an organic...
4656297 Coproduction of butanediol and tetrahydrofuran and their subsequent separation from the reaction product mixture  
Mixtures of tetrahydrofuran and 1,4-butanediol at a predetermined mole ratio are produced by the hydrogenation of dimethylsuccinate in the presence of a copper chromite catalyst wherein said ratio...
4652685 Hydrogenation of lactones to glycols  
Lactones, particularly gamma-butyrolactone, are hydrogenated in the vapor phase to glycols over a copper chromite catalyst.
4609636 Pd/Re hydrogenation catalyst for making tetrahydrofuran and 1,4-butanediol  
Palladium/rhenium-on-carbon catalyst; a method employing said catalyst to produce tetrahydrofuran, 1,4-butanediol or mixtures thereof in selectable ratios from a number of starting reactants; and a...
4550185 Process for making tetrahydrofuran and 1,4-butanediol using Pd/Re hydrogenation catalyst  
Palladium/rhenium-on-carbon catalyst; a method employing said catalyst to produce tetrahydrofuran, 1,4-butanediol or mixtures thereof in selectable ratios from a number of starting reactants; and a...
4536584 Process for the thermochemical conversion of biomass  
A process is provided for the thermochemical conversion of biomass to useful gaseous and liquid organic products. The inventive process utilizes a catalyst to obtain increased yields of gaseous and...
4336195 Preparation of cyclic ethers  
Cyclic ethers such as tetrahydrofuran, dioxane, and tetrahydropyran are produced by reacting dimethyl carbonate with an appropriate primary dihalide in the presence of a quaternary ammonium or...
4301077 Process for the manufacture of 1-4-butanediol and tetrahydrofuran  
Oxygenated C 4 hydrocarbons, such as maleic anhydride, are hydrogenated to tetrahydrofuran and/or 1,4-butanediol by a process comprising contacting the hydrocarbon with hydrogen at hydrogenation...
4268447 Process for producing tetrahydrofuran and 1,4-butanediol  
A process for producing simultaneously tetrahydrofuran and 1,4-butanediol in any desired proportion which comprises (a) reacting the acetic ester of 1,4-butanediol with a theoretical or smaller...
4261900 Preparation of tetrahydrofuran  
A process for the preparation of tetrahydrofuran by heating a carboxylic acid diester of butane-1,4-diol in the gas phase at above about 160° C. in the presence of an aluminum oxide catalyst which...
4156685 Process for producing a hydrofuran and a 1,4-diol  
A process is disclosed in which hydrolysis and cyclization of an acetate ester of a 1,4-diol are carried out in separate reaction zones in the pressure of a solid acid catalyst and unreacted...
4155919 Process for the production of 1,4-butanediol and tetrahydrofuran  
Process for the catalytic hydrogenolysis of maleic anhydride to give 1,4-butanediol and tetrahydrofuran in a single-stage operation by means of hydrogen under heat and pressure, in the presence of...
4140704 Process for producing cyclic ether  
This invention relates to an improved process for producing cyclic ether from an acetic acid ester of 1,4-glycol and water by cyclization reaction which is characterized by solidifying a high...
4124600 Preparation of tetrahydrofuran  
Tetrahydrofuran is prepared by the vapor phase reaction of a compound selected from 1,4-butanediol, monoesters of 1,4-butanediol, diesters of 1,4-butanediol and mixtures thereof in the presence of...
4105679 Process for producing a cylic ether from an acetic ester of a 1,4-glycol  
A process for producing tetrahydrofuran or dihydrofuran from an acetic ester of 1,4-butanediol or 1,4-dihydroxybutene-2 is disclosed in which the raw material liquid acetic ester and steam are...
4094887 Process for preparing cyclic ethers  
This invention relates to a process for preparing tetrahydrofuran or dihydrofuran by reacting an acetic acid ester of 1,4-butanediol or 1,4-dihydroxybutene-2 and water in the presence of an acid...
4080366 Conversion of esters of 1,4-butanediol to tetrahydrofuran  
An improved process for producing tetrahydrofuran by dehydroacyloxylation or hydrolysis-dehydroacyloxylation of carboxylic acid mono- and diesters of 1,4-butanediol, the improvement comprising...
4079068 Manufacture of tetrahydrofuran from the diacetate of 1,4-butanediol  
Tetrahydrofuran is prepared from a compound containing butanediol or capable of generating butanediol. The butanediol-donating compound is an ester of butanediol which is reacted with hydrolysis...
4048196 Manufacture of butanediol and/or tetrahydrofuran from maleic and/or succinic anhydride via γ- butyrolactone  
A process for the manufacture of 1,4-butanediol and/or tetrahydrofuran, wherein maleic acid or succinic acid is used as the starting material, butyrolactone is produced in defined stages and is...
4011244 Process for preparing tetrahydrofuran  
A process for preparing tetrahydrofuran which comprises heating a carboxylic acid monoester of 1,4-butanediol in the vapor phase in the presence of a dehydroacyloxylation catalyst.
4006104 Process for converting γ-butyrolactone into tetrahydrofuran  
A process for converting γ-butyrolactone to tetrahydrofuran by treating the lactone with hydrogen in the presence of a cobalt-copper chromite catalyst at elevated pressures and temperatures.
4005112 Multistep method for preparation of tetrahydrofuran starting from propylene, oxygen and a carboxylic acid  
A process for preparing tetrahydrofuran which comprises heating a carboxylic acid monoester of 1,4-butanediol in the presence of a dehydroacyloxylation catalyst.
4005113 Multi-step process for preparation of tetrahydrofuran starting from propylene, oxygen and a carboxylic acid  
A process for preparing tetrahydrofuran the last step of which comprises heating a carboxylic acid of 1,4-butanediol with water in the presence of a hydrolysis-dehydroacyloxylation catalyst.
3894054 Process for production of tetrahydrofuran  
Tetrahydrofuran is produced by catalytically hydrogenating and dehydrating maleic anhydride at a temperature of 200°-300°C under a pressure of 10-50 kg/cm 2 in a molar ratio of hydrogen:maleic...
3890361 Production of gamma-butyrolactone  
An aliphatic gamma-dicarboxylic compound which is a precursor for hydrogenation into a corresponding gamma-butyrolactone is caused to contact hydrogen in the presence of a hydrogenation catalyst...
3853922 PROCESS FOR PRODUCING TETRAHYDROFURAN  
Tetrahydrofuran is produced in high yields by hydrogenation of maleic or fumaric acid or their derivatives or γ-butyrolactone in the presence of a catalyst which is an intimate mixture of metallic...
3492314 PROCESS FOR CATALYTIC HYDROGENATION OF DICARBOXYLIC ACID ANHYDRIDE AND CATALYST THEREFOR  
3408388 Process for preparing esters of unsaturated alcohols from monoesters of saturated 2, 2, 4-trisubstituted-1, 3-diols  
3370067 Hydrogenolysis of butyrolactone and gamma-valerolactone to the corresponding cyclic ethers  
3157710 Process for the preparation of 1, 1, 4, 4-tetraalkyl-1, 3-butadiene  
3829448 Title is not available  
3758512 Title is not available  
Matches 51 - 82 out of 82 < 1 2