Patents in Class 549/509

Matches 1 - 50 out of 78

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Match	Document	Document Title
1	7598405	Method for the distillative processing of tetrahydrofuran The present invention provides a process for distillatively purifying tetrahydrofuran in the presence of a polar solvent.
2	7465816	Production of tetrahydrofuran from 1,4-butanediol Provided is a method for the production of tetrahydrofuran (THF) from 1,4-butanediol (BDO) using a zirconium sulfate (Zr(SO 4 ) 2 .nH 2 O) catalyst. The method of the present invention can achieve...
3	7396945	Method of preparing tetrahydrofuran The present invention relates to a process for preparing tetrahydrofuran from 1,4-butandiol. According to the process in the present invention, a metal sulfate catalyst selected from the group...
4	7351311	Method for purifying tetrahydrofuran by distillation Crude water-containing tetrahydrofuran is purified by passing the crude tetrahydrofuran through three distillation columns, withdrawing water from the bottom of the first column, recycling...
5	7148318	Method for producing polytetrahydrofurane having a low color indices The invention provides a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, their monoesters or diesters and the monoesters or diesters of polytetrahydrofuran having a low color...
6	7098349	Method for producing tetrahydrofuran The invention relates to a process for the continuous preparation of THF by reaction of a 1,4-butanediol-containing reaction mixture over a heteropolyacid catalyst which has not been predried,...
7	7019155	Hydrogenation of tetrahydroxybutane to tetrahydrofuran Disclosed is a method for the hydrogenation of tetrahydroxybutane in the presence of supported rhenium catalysts and an acid to form tetrahydrofuran and its precursors.
8	6852869	Method for the production of polytetrahydrofuran with low color index In a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers having a low color number, the polymers obtained by cationic polymerization of...
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	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...
11	6593481	Hydrogenation of 3,4-tetrahydrofurandiol to tetrahydrofuran Disclosed is a method whereby 3,4-tetrahydrofurandiol is hydrogenated in the presence of Rh, Re, Pd, Ru and Ni catalysts, optionally supported, to form tetrahydrofuran and its precursors.
12	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,...
13	6429321	Depolymerization of polytetrahydrofuran derivatives The invention discloses a method for depolymerization of a mixture containing polytetrahydrofuran derivatives, including heating the mixture comprising polytetrahydrofuran derivatives at 100-250°...
14	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...
15	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...
16	6262280	Shilov-type reactions The functionalization of compounds containing carbon-hydrogen bonds utilizing platinum compounds in Shilov-type reactions is improved by using hydrogen peroxide or selected Pt[IV] compounds as an...
17	6204399	Process and arrangement for producing tetrahydrofuran Process and arrangement for producing tetrahydrofuran from a hydrous butane diol solution contaminated by light volatile, organic compounds, comprising the following process stages: a)...
18	6201137	Process for purifying tetrahydrofurans used as starting material for polyether polyols Tetrahydrofurans suitable for use as starting materials in the synthesis of polyether polyols without causing coloration in the product polyether polyols can be obtained by contacting crude...
19	6169189	Process for preparing tetrahydrofuran from dialkoxybutenes A process for preparing tetrahydrofuran, which comprises reacting 1,4-butenediol diethers of the formulae I and/or II RO--CH 2 --CHCH--CH 2 --OR I RO--CH 2 --CH 2 CH--CH 2 --OR II,...
20	6159345	Method and apparatus for recovering and/or recycling solvents A method and apparatus for recycling and recovering potentially explosive solvents includes providing a contaminated solvent to a distillation tank, vaporizing the solvent in the distillation tank,...
21	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...
22	6066746	Radiation curing of dihydrofuran derivatives Process for producing coatings or moldings by radiation curing, which involves using high-energy light to irradiate radiation-curable compositions containing 1-100% by weight, based on the total...
23	5917061	Process for producing cyclic ethers by liquid phase reaction This invention is directed to a process for producing cyclic ethers by liquid phase reaction, which comprises using a crystalline aluminosilicate zeolite as the catalyst, and subjecting an...
24	5874652	Process for hydrogenating aqueous aldehyde mixtures A process for hydrogenating aqueous mixtures of 4-hydroxybutanal and 3-hydroxy-2-methylpropanal is disclosed. The process uses a metallic Pt--Ru catalyst supported on γ-alumina. The process gives...
25	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...
26	5565581	Epoxidation of olefins The present invention relates to the epoxidation of olefins using cyclohexyl hydroperoxide as reactant, the improvement being using a secondary or tertiary alcohol such as cyclohexanol or tertiary...
27	5559254	Separation of a mixture of methanol and tetrahydrofuran into its constituents A process is disclosed for separating a mixture of methanol and tetrahydrofuran into its components. The separation is carried out in the liquid or gaseous phase through an organophilic membrane,...
28	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...
29	5166370	Preparation of tetrahydrofuran using a supported transition metal A process for producing tetrahydrofuran, 1,4-butanediol, and 2-methyl-1,3,-propanediol is disclosed. A mixture containing 4-hydroxybutanal and 3-hydroxy-2-methylpropanal is hydrogenated in the...
30	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...
31	5099039	Production of the from 1,4-butanediol using a polybenzimidazole catalyst A process for converting 1,4-butanediol to tetrahydrofuran using polybenzimidazole to catalyze the reaction. The conversion is accomplished by heating the 1,4-butanediol in the presence of the PBI....
32	5008408	Preparation of 1,4-butanediol and tetrahydrofuran Mixtures which contain 1,4-butanediol and tetrahydrofuran are prepared by heating 4-hydroxybutyraldehyde of the formula ##STR1## at 20°-300° C. in the presence or absence of 1,4-butanediol and...
33	4919765	Process for the purification of tetrahydrofuran Tetrahydrofuran is recovered by a two stage distillation procedure from a crude hydrogenation product resulting from vapor phase hydrogenation of diethyl maleate and containing water, ethanol and a...
34	4918204	Tetrahydrofuran purification Purification of tetrahydrofuran from the dehydrocyclization of 1,4-butanediol in the presence of an organic acid catalyst has been accomplished by the extractive distillation of crude...
35	4912236	Purification of tetrahydrofuran by distillation Crude water-containing tetrahydrofuran is purified by distillation by a process in which the crude tetrahydrofuran is passed through three distillation columns, water being removed from the bottom...
36	4904806	Preparation of tetrahydrofurans from butane-1,4-diols Tetrahydrofurans are prepared in the gas phase from butane-1,4-diols which may be substituted by alkyl, alkenyl and/or aryl radicals in the carbon skeleton. The reaction is carried out in the...
37	4879420	Preparation of mixtures of butanediols Process for preparing 2-alkyl-1,4-butanediols and mixtures with 1,4-butanediol which comprises bringing together, at an initial alkaline pH, and at a temperature and pressure suitable for reaction,...
38	4859801	Synthesis of mixtures of butanediols Process for preparing 2-alkyl-1,4-butanediols and mixtures with 1,4-butanediol which comprises bringing together, at an initial alkaline pH, and at a temperature and pressure suitable for reaction,...
39	4665205	Process for preparing tetrahydrofuran A process for preparing tetrahydrofuran which comprises steps of; (i) subjecting 1,4-butanediol to dehydration reaction, and (ii) subjecting the reaction product obtained from the dehydration...
40	4590285	Process for preparing a mixture of tetrahydrofuran and 3-alkyl tetrahydrofuran and copolymers thereof A mixture of 1,4-butanediol and 2-alkyl-1,4-butanediol is produced by catalytic hydrogenation and reaction with an aldehyde. Such mixture is cyclized to a mixture of tetrahydrofuran and 3-alkyl...
41	4590312	Process for preparing 2-alkyl-1,4-butanediols 2-Alkyl-1,4-butanediols are prepared from 1,4-butynediol or 1,4-butenediol by catalytic hydrogenation and reaction with an aldehyde.
42	4588827	Preparation of tetrahydrofuran Tetrahydrofuran is prepared from a crude alkaline aqueous solution of butane-1,4-diol, as obtained by reaction of acetylene with aqueous formaldehyde and catylytic hydrogenation of the resulting...
43	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...
44	4474973	Acidic mixed oxide catalytic dealkylation to produce 1,4-butanediol and tetrahydrofuran A coproduct continuous dealkylation process is described in which 4-t-butoxy-n-butanol is contacted with acidic silica-alumina catalyst at temperatures in the 160°-200° C. range (reactor wall...
45	4413136	Purification of tetrahydrofuran The amount of methacrolein impurity in tetrahydrofuran made from acetylene and formaldehyde can be significantly reduced by treating it with hydrogen peroxide during an interval in the multi-stage...
46	4387236	Liquid phase oxidation A process of removing solids from an aqueous redox catalyst system which solids are formed in the production of furan compounds from butadiene or a butadiene derivative by heating at 180°-280° C....
47	4380657	Conversion of alkanols to ethers Alkanols are converted to ethers by contact at temperature of 150° C.-550° C. with a novel siliceous composition prepared by impregnating porous silica with aluminum hydride and subsequently...
48	4363924	Depolymerization of polytetramethylene glycol ethers A process for depolymerizing polytetramethylene glycol ethers, wherein the latter are heated at from 90° to 180° C. in the presence of a bleaching earth.
49	4288369	Production of cyclic ethers A process for the preparation of cyclic ethers which comprises reacting an alkanediol in which the hydroxyl groups are separated by a chain of at least four carbon atoms in the liquid phase of a...
50	4287127	Production of tetrahydrofuran Tetrahydrofuran is produced by converting allyl alcohol to an allyl t-alkyl or -cycloalkyl ether of the general formula: ##STR1## wherein R 1 and R 2 each, independently of the other, represent a...

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