Patents in Class 549/508

Matches 1 - 50 out of 82

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Match	Document	Document Title
1	7598404	Process for the production of ethers A process for the production of an ether optionally with a diol and/or a lactone, by reaction of a corresponding organic feed material selected from unsaturated dicarboxylic acids and/or...
2	RE39794	Process for the simultaneous production of maleic anhydride and its hydrogenated derivatives A process is described for the co-production of maleic anhydride and at least one C 4 compound selected from butane-1,4-diol, γ-butyrolactone, and tetrahydrofuran in which maleic anhydride is...
3	7214641	Catalyst and hydrogenation of carbonyl compounds in the liquid phase using the catalyst The present invention provides a process for hydrogenating carbonyl compounds, in particular C 4 -dicarboxylic acids to mixtures of tetrahydrofuran and gamma-butyrolactone, over supported rhenium...
4	7193091	Method for the simultaneous production of tetrahydrofurans and pyrrolidones A process for coproducing alkyl-substituted or unsubstituted THF and pyrrolidones by catalytically hydrogenating C4-dicarboxylic acids and/or derivatives thereof in the gas phase in the presence of...
5	6989455	Two-stage process for the hydrogenation of maleic acid to 1,4-butanediol In the process for the conversion of maleic acid to gamma-butyrolactone, 1.4-butanediol and/or tetrahydrofuran, a feedstream comprising maleic acid is hydrogenated in a first hydrogenation zone to...
6	6958404	Method for the hydrogenation of maleic anhydride and related compounds in a fluid bed reactor C 4 -dicarboxylic acids or derivatives thereof are hydrogenated in the gas phase in a fluidized-bed reactor. It is possible to use catalyst compositions known per se.
7	6936727	Process for the production of ethers, typically thf A process is described for the production of ethers, typically terahydrofuran, by reaction of a corresponding organic feed material selected from dicarboxylic acids and/or anhydrides, monoesters of...
8	6888011	Porous catalyst for the hydrogenation of maleic anhydride to tetrahydrofuran A hydrogenation catalyst which is suitable, in particular, for the hydrogenation of maleic anhydride and its derivatives to THF or its derivatives comprises copper oxide and at least one further...
9	6844452	Process for the co-production of aliphatic diols and cyclic ethers A process for the co-production of a diol product (e.g. butane-1,4-diol) and a cyclic ether (e.g. tetrahydrofuran) by hydrogenation of an aliphatic diester or lactone feedstock (e.g. dimethyl or...
10	6756501	Manufacture of 3-methyl-tetrahydrofuran from alpha-methylene-gamma-butyrolactone in a single step process Disclosed is a single step continuous hydrogenation process for the preparation of 3-methyl-tetrahydrofuran from alpha-methylene-gamma-butyrolactone, in the presence of a catalytic metal.
11	6730800	Method for the production of tetrahydrofuran Unsubstituted or alkyl-substituted THF is obtained by catalytic hydrogenation in the gas phase of C 4 -dicarboxylic acids and/or their derivatives using a catalyst comprising <80% by weight,...
12	6700003	Process for producing a saturated cyclic ether A method for producing a saturated cyclic ether from a fatty acid ester of an α, δ-diol stably in high yield over a long period of time, is presented. It is a process for producing a saturated...
13	6673946	Manufacture of 3-methyl-tetrahydrofuran from 2-methyl-gamma-butyrolactone Disclosed is a hydrogenation process for the preparation of 3-methyl-tetrahydrofuran from 2-methyl-gamma-butyrolactone. The above process enables the production of the objective highly pure...
14	6670490	Platinum-rhenium-tin catalyst for hydrogenation in aqueous solution An improved catalyst of platinum, rhenium and tin with an inert support used for hydrogenation of an hydrogenatable precursor in an aqueous solution and a method for using the catalyst in the...
15	6566539	Catalyst regeneration by treatment with an oxidizing agent A process for the production of tetrahydrofuran, gamma butyrolactone, 1,4-butane diol and the like from a hydrogenatable precursor such as maleic acid, succinic acid, corresponding esters and their...
16	6521765	Process for the preparation of 3-methyltetrahydrofuran Disclosed is a process for the preparation of 3-methyltetrahydrofuran (MeTHF) from 3-(hydroxymethyl)tetrahydrofuran (HOMeTHF) by contacting HOMeTHF with hydrogen in the presence of an acidic,...
17	6489493	Acyclic chiral derivatives of hibiscus acid and the process of preparing the same The present invention relates to a novel acyclic chiral derivatives of Hibiscus acid of formula I, wherein: R 1 =R 5 =lower aryl or alkyl ester or substituted aryl or alkyl alcohol R 3...
18	6479704	Hydrogenation with monolith reactor under conditions of immiscible liquid phases The present invention relates to an improved for the hydrogenation of an immiscible mixture of an organic reactant in water. The immiscible mixture can result from the generation of water by the...
19	6433193	Process to afford gamma butyrolactone and tetrahydrofuran A process for production of tetrahydrofuran and gamma butyrolactone by hydrogenation of maleic anhydride recovered from a process of conversion of a n-butane. The process consists essentially of...
20	6355814	Process for the preparation of 3-hydroxymethyl tetrahydrofuran The present invention relates to a catalytic process for the preparation of 3-hydroxymethyl tetrahydrofuran of formula IV with hydroformylation as one of the key steps. The process comprises...
21	6316640	Preparation of tetrahydrofuran In a process for preparing THF (tetrahydrofuran) by reaction of a 1,4-butanediol-containing reaction mixture over an acid catalyst, the reaction mixture comprises further alcohols different from...
22	6288245	Process for the production of tetrahydrofuran and gammabutyrolactone A two-stage process for producing tetrahydrofuran and gammabutyrolactone in varying proportions from maleic, succinic anhydride or fumaric acid esters, by vapor phase hydrogenation. The first stage...
23	6248906	Process for the production of tetrahydrofuran, gammabutyrolactone and butanediol Process for the production of tetrahydrofuran, gammabutyrolactone and butanediol starting from maleic anhydride esters, consisting of two subsequent hydrogenations.
24	6239292	Process for preparing gamma-butyrolactone, butane-1,4-diol and tetrahydrofuran A process for the production of at least one C 4 compound selected from 1,4-butanediol, gamma-butyrolactone and tetrahydrofuran, in which a solution of maleic anhydride in a high boiling ester is...
25	6225477	Process for regeneration of carbon-supported, rhenium-containing catalysts This invention relates to a method of improving the catalytic performance of palladium or ruthenium, rhenium-on-carbon hydrogenation catalysts operating in aqueous media where loss of soluble...
26	6204395	Process for the preparation of butane-1,4-diol, γ-butyrolactone and tetrahydrofuran A process is described for the production of butane-1,4-diol, γ-butyrolactone and/or tetrahydrofuran. A vaporous stream containing maleic anhydride, water, and carbon oxides is contact in an...
27	6191322	Process for the production of butanediol by liquid phase hydrogenation Process for the production of 1,4-butanediol by mixed phase catalytic hydrogenation of gamma-butyrolactone, succinic anhydride esters, or mixtures thereof.
28	6147233	Process for the preparation of 3-methyltetrahydrofuran Disclosed is a process for the preparation of 3-methyltetrahydrofuran (3-MeTHF) from 3-(hydroxymethyl)tetrahydrofuran (3-HOMeTHF) by a plurality of process steps comprising (1) esterifying...
29	6100410	Process for the production of 1,4-butanediol, γ-butyrolactone and tetrahydrofuran A process for the production of at least one C 4 compound selected from butane-1,4-diol, γ-butyrolactone and tetrahydrofuran comprises contacting a vaporous stream containing maleic anhydride...
30	6022984	Efficient synthesis of furan sulfonamide compounds useful in the synthesis of new IL-1 inhibitors An efficent synthesis of furan sulfonamide compounds of formula ##STR1## comprising reacting a compound of formula 11 with a Grignard reagent in a reaction inert solvent, wherein R' is (C 1 -C 6...
31	6008384	Method and Ru,Re,Sn/carbon catalyst for hydrogenation in aqueous solution An improved two step (dual stage catalysis) aqueous hydrogenation process and a novel trimetallic hydrogenation catalysts consisting essentially of highly dispersed, reduced ruthenium and rhenium...
32	5990324	Process for producing 3-methyltetrahydrofuran There is disclosed a process for producing 3-methyl-tetrahydrofuran which comprises the step 1 of subjecting the compound represented by the general formula [I] ROOC--CH(CH 3 )--CH 2 --CHO ...
33	5969164	Catalysts for the hydrogenation of maleic acid to 1,4-butanediol An improved catalyst for the hydrogenation of maleic acid, maleic anhydride or other hydrogenatable precursor to 1,4-butanediol and tetrahydrofuran has been discovered. This hydrogenation catalyst...
34	5892107	Method for the production of levulinic acid A method of producing dehydration products from one or more 5-carbon or 6-carbon sugars includes reacting said one or more sugars at 40°-240 ° C. for 1 to 96 hours in the presence of 10-90%...
35	5883266	Hydrogenated 5-carbon compound and method of making The present invention is based upon the surprising discovery that a 5-carbon compound selected from the group of 4-oxopentanoic acid, at least one lactone of 4-oxopentanoic acid, and combinations...
36	5856531	Preparation of 3-methytetra-hydrofuran from 2,3-dihydrofuran Disclosed is a two-step process wherein (1) 2,3-dihydrofuran is reacted with a trialkyl orthoformate in the presence of an acidic catalyst to produce a 2-alkoxy-3-(dialkoxymethyl)tetrahydrofuran...
37	5792875	Catalytic production of butyrolactone or tetrahydrofuran A process for the preparation of supported bimetallic catalyst useful for the hydrogenation of esters of dicarboxylic acids, which comprises impregnating activated alumina powder with transition...
38	5698749	Catalysts for the hydrogenation of aqueous maleic acid to 1,4-butanediol Maleic acid, maleic anhydride or other hydrogenatable precursor are catalytically hydrogenated to 1,4-butanediol and tetrahydrofuran. It has been discovered that high yields of 1,4-butanediol are...
39	5663382	Process for preparing 3-methyltetrahydrofuran A process for preparing 3-methyltetrahydrofuran is herein disclosed which comprises reacting a methacrylic acid ester with carbon monoxide and a lower aliphatic alcohol to obtain a methylsuccinic...
40	5618953	Process for producing 3-methyltetrahydrofuran A process for producing 3-methyltetrahydrofuran, wherein in a first step, prussic acid is reacted with methyl methacrylate to produce methyl 3-cyanoisobutyrate. The methyl 3-cyanoisobutyrate is...
41	5536854	Preparation of 2-methyl-1,4-butanediol and 3-methyltetrahydrofuran 2-Methyl-1,4-butanediol and 3-methyltetrahydrofuran are prepared by reacting a compound of the general formula I or II ##STR1## where R 1 and R 2 are each hydrogen or C 1 -C 8 -alkyl and the...
42	5371242	Preparation of products of the reduction of 4-hydroxybutyric acid derivatives Abstract of the Disclosure: Products of the reduction of 4-hydroxybutyric acid derivatives of the formula IIa ##STR1## where one of A and B is methylene and the other is cyclopropylidene, or of C 1...
43	5326889	Process for producing 1,4-butanediol and tetrahydrofuran There is disclosed a process for the production of 1,4-butanediol and tetrahydrofuran by the catalytic hydrogenation in the gas phase of γ-butyrolactone using a solid catalyst comprising copper...
44	5319111	Preparation of tetrahydrofuran and gamma-butyrolactone A process for the preparation of tetrahydrofuran or tetrahydrofuran and γ-butyrolactone from the product of the hydrogenation of maleic acid, succinic acid, maleic anhydride, succinic anhydride...
45	5128490	Isolation of tetrahydrofuran from mixtures which contain tetrahydrofuran, 1,4-butanediol, gamma-butyro-lactone and succinic acid esters A process is described for isolating tetrahydrofuran from mixtures containing tetrahydrofuran, 1,4-butanediol, -butyrolactone and succinic acid esters, in which the mixtures are heated to from...
46	5072009	Vapor-phase hydrogenation of maleic anhydride to tetrahydrofuran and gamma-butyrolactone Tetrahydrofuran and optionally gamma-butyrolactone are prepared from at least one of maleic anhydride or succinic anhydride in the absence of alcohols by catalytically hydrogenating vaporous maleic...
47	5055599	Process for the hydrogenation of maleic anhydride to tetrahydrofuran and gamma-butyrolactone Tetrahydrofuran and gamma-butyrolactone are prepared from at least one of maleic anhydride or succinic anhydride by catalytically hydrogenating vaporous maleic anhydride or vaporous succinic...
48	4973717	Production of alcohols and ethers by the catalysed hydrogenation of esters An alcohol and/or an ether is produced from a carboxylic acid ester by reacting the ester with hydrogen at elevated temperature in the presence as catalyst of a composition comprising an alloy of...
49	4810807	Hydrogenation of maleic anhydride to tetrahydrofuran A continuous process for the preparation of tetrahydrofuran comprises, in a single-stage process, catalytically hydrogenating the solution which results when at least one of maleic anhydride or...
50	4772729	Hydrogenation of citric acid and substituted citric acids to 3-substituted tetrahydrofuran, 3- and 4-substituted butyrolactones and mixtures thereof A process is disclosed for preparing 3-substituted tetrahydrofuran, 3- and 4-substituted butyrolactones and mixtures thereof comprising hydrogenating a hydrogenatable precursor in the presence of...

Matches 1 - 50 out of 82

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