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7612230 |
Method for producing acrylic acid
There is provided a novel process for producing acrylic acid by which acrylic acid can be obtained from a raw material independent of petroleum. The process for producing acrylic acid according to...
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7608734 |
Method of producing unsaturated acid in fixed-bed catalytic partial oxidation reactor with high efficiency
Disclosed is a process for producing unsaturated aldehydes and/or unsaturated acids from olefins or alkanes in a fixed bed shell-and-tube heat exchanger-type reactor by catalytic vapor phase...
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7588739 |
Fixed bed multitube reactor
A fixed-bed multitubular reactor, comprising a plurality of reaction tubes ( 3 ) filled with a catalyst and catalyst temperature measurers ( 4 ) measuring the temperatures of the reaction tubes...
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7566804 |
Process for preparing acrylic acid
A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C 3 precursor of acrylic acid is fractionally...
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7563927 |
Process for producing (meth)acrylic acid or (meth)acrolein
A producing method of (meth)acrolein or (meth)acrylic acid where by use of a multi-tubular reactor that has a plurality of reaction tubes filled with a catalyst, catalytic gas phase oxidation of...
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7544836 |
Process for producing (meth)acrolein or (meth)acrylic acid
An object of the invention is to provide a production method for (meth)acrolein or (meth)acrylic acid which can continue an operation without causing a decomposition reaction of acrolein or the...
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7541490 |
Method for production of acrylic acid and apparatus for production of acrylic acid
Chilled coolant is prepared by liquid coolant utilizing the latent heat generated by a gasification of liquefied propylene, for example, and this chilled coolant is used in heat exchangers which...
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7524987 |
Process for preparing acrolein or acrylic acid or a mixture thereof from propane
A process for preparing acrolein, or acrylic acid or a mixture thereof as a target product from propane, in which propane is partially dehydrogenated under heterogeneous catalysis in a reaction...
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7518015 |
Process for heterogeneously catalyzed gas phase partial oxidation of at least one organic starting compound
A process for heterogeneously catalyzed gas phase partial oxidation of an organic starting compound over a fixed catalyst bed freshly installed into a reaction chamber, in which the reduction in...
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7511172 |
Method for production of (meth)acrylic acid
A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of...
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7429678 |
Composite-oxide catalyst and process for production of acrylic acid using said catalyst
There are disclosed a catalyst and a process for production of acrylic acid using this catalyst, wherein, even under conditions where hot spots are formed, the catalyst is excellent in activity,...
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7414149 |
Non-routine reactor shutdown method
The non-routine (e.g., emergency) shutdown of a chemical reaction process is achieved by a method of safely operating a chemical reaction process which comprises the steps of detecting an...
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7332624 |
Method for production of acrylic acid
A method for the production of acrylic acid comprises (i) a step for introducing a polymerization inhibitor to a stage other than a stage for supplying a raw material and a stage for supplying a...
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7332139 |
Process and device for carrying out reactions in reactor with slot-shaped reaction spaces
Reactions between at least two fluid reactants are performed in a reactor comprising wall elements ( 1 ), slot-shaped reaction spaces ( 3 ) and cavities ( 5 ) for conducting a fluid heat-carrier...
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7326811 |
Method for production of (meth)acrylic acid by use of a shell-and-tube heat exchanger
A shell-and-tube type heat exchanger of the smallest possible length necessary for heat exchange is disclosed which is capable of obtaining uniform distribution of flow of a shell side fluid and...
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7326810 |
Method for starting up reactor
In the reaction of catalytic gas phase oxidation induced by the supply of at least a raw material to be oxidized and a molecular oxygen-containing gas to a reactor for catalytic gas phase...
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7321060 |
Method for production of acrylic acid
A method for the production of acrylic acid of high concentration by absorbing acrylic acid with high absorption ratio of acrylic acid is provided. In a method for producing acrylic acid by a...
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7304179 |
Method for producing methacrylic acid
The present invention provides a method for producing methacrylic acid through gas-phase catalytic oxidation of methacrolein or a methacrolein-containing gas with molecular oxygen or a gas...
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7300555 |
Method for the rectifying separation of liquids containing (meth)acrylic monomers in a rectification column
A process for rectificatively separating liquids containing (meth)acrylic monomers in a rectification column is provided, in which a stream is withdrawn from the rectification column and recycled...
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7297814 |
Multitube reactor, vapor phase catalytic oxidation method using the multitube reactor, and start up method applied to the multitube reactor
A multitube reactor, wherein tubes having smaller tolerance between a nominal size and actual sizes are used as reaction tubes to stably perform a high yield reaction for a long period, a catalyst...
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7294734 |
Process for converting a hydrocarbon to an oxygenate or a nitrile
This invention relates to a process for converting a hydrocarbon reactant to a product comprising an oxygenate or a nitrile, the process comprising: (A) flowing a reactant composition comprising...
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7258766 |
Method for collecting acrylic acid
A method for collecting acrylic acid is provided, which includes the step of collecting acrylic acid using an aqueous medium from a reaction gas containing acrylic acid obtained by catalytic...
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7253309 |
Method for production of methacrylic acid
This invention is related to a shell-and-tube type reactor provided with reaction tubes packed with a catalyst and adapted to circulate a heat medium to the fluid outside the tubes and is...
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7253308 |
Method for catalytic phase oxidation to (meth) acrolein and/or (meth) acrylic acid
A process for the continuous gas-phase oxidation of C 3 - and C 4 -precursors to (meth)acrolein and/or (meth)acrylic acid in the presence of a catalyst in a reactor which has a feed for the...
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7214821 |
Preparation of (meth)acrolein and/or (meth)acrylic acid by heterogeneously catalyzed partial oxidation of C3 and/or C4 precursor compounds
A process is proposed for preparing (meth)acrolein and/or (meth)acrylic acid by partially oxidizing C 3 and/or C 4 precursor compounds in the gas phase in the presence of a heterogeneous...
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7196217 |
Operation of a continuous heterogeneously catalyzed gas phase partial oxidation of at least one organic compound
Process for operating a continuous heterogeneously catalyzed gas phase partial oxidation of at least one organic compound using compressed air as the oxygen source which is filtered before its...
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7183428 |
Method for production of acrylic acid
A method for producing acrylic acid by using an acrylic acid-containing solution of high concentration without azeotropic distillation is provided. This method of producing acrylic acid comprises...
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7179875 |
Method for producing water-absorbent resins
In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene...
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7176335 |
Method for producing methacrolein from isobutane
A process prepares methacrolein from isobutane by subjecting isobutane to a partial catalytic dehydrogenation in the gas phase and using the isobutenic product gas mixture to charge an oxidation...
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7147048 |
Shell-and-tube type heat exchanger and method for production of (meth) acrylic acid by use of the exchange
A shell-and-tube type heat exchanger of the smallest possible length necessary for heat exchange is disclosed which is capable of obtaining uniform distribution of flow of a shell side fluid and...
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7144557 |
Multitube reactor, vapor phase catalytic oxidation method using the multitube reactor, and start up method applied to the multitube reactor
A multitube reactor, wherein tubes having smaller tolerance between a nominal size and actual sizes are used as reaction tubes to stably perform a high yield reaction for a long period, a catalyst...
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7119227 |
Process for catalytic vapor phase oxidation
The present invention provides a process for catalytic vapor phase oxidation which prevents runaway reaction or early deterioration of a catalyst, in the production of (meth)acrylic acid or the...
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7109374 |
Method for the continuous extraction of (meth)acrylic acid
A process for the continuous recovery of (meth)acrylic acid from the reaction gas of a catalytic gas-phase oxidation comprising the following process stages is proposed:
I quenching of the...
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7074955 |
Safe operation of a continuous heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound
A continuously operated heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound in an oxidation reactor is operated safely by a process in which an explosion diagram...
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7045657 |
Catalytic gas phase oxidation process
The object of the present invention is to provide a process in which, when the unsaturated carboxylic acid is produced, or when the unsaturated aldehyde and/or the unsaturated carboxylic acid are...
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7045482 |
Method for preparing a heteropolyacid catalyst from basic solvent treatments and method for preparing methacrylic acid using thererof
The present invention relates to a method for preparing a heteropolyacid catalyst and method for preparing methacrylic acid using thereof. More particularly, the present invention relates to a...
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7038080 |
Heterogeneously catalyzed gas-phase partial oxidation of acrolein to acrylic acid
A process for the heterogeneously catalyzed gas-phase partial oxidation of acrolein to acrylic acid over a multimetal oxide material having a specific structure, which contains the elements Mo and...
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7030269 |
Catalyst and process for production of acrylic acid
There are disclosed: a catalyst which can be used for production of acrylic acid and is excellent in the catalytic performances (e.g. conversion of starting material, selectivity of aimed product)...
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7012156 |
Preparation method of methacrylic acid
The present invention relates to a preparation method of methacrylic acid which improves reaction selectivity of methacrylic acid. The method may include producing methacrylic acid by gas phase...
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7005544 |
Method for preventing polymerization in an acrylic acid manufacturing process
A method for effectively preventing polymerization of acrylic acid during an azeotropic dehydration distillation in an acrylic acid manufacturing process and thus enabling stable operation of the...
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6969774 |
Method for producing methacrylic acid
In a method for synthesizing methacrylic acid by using a fixed bed tube type reactor provided with a catalyst bed into which a solid oxidation catalyst is filled and with a heat medium bath and by...
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6949675 |
Process for producing acrylic acid
The present invention provides a process for producing acrylic acid, by which process the problem, such that the catalyst placed on the gas inlet side deteriorates faster than that placed on the...
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6939991 |
Preparation of acrylic acid
In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a C 3 precursor of acrylic acid, after direct cooling...
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6930201 |
Process for producing methacrylic acid
In a method of producing methacrylic acid by passing a material gas containing methacrolein, oxygen and water vapor through a reactor packed with a catalyst containing as the main component a...
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6927307 |
Method for reactivating catalyst for methacrylic acid preparation
This invention provides a method of reactivating a catalyst for methacrylic acid production, which catalyst is used in production of methacrylic acid through vapor-phase oxidation of methacrolein...
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6921836 |
Multimetal oxide materials
Multimetal oxide materials containing molybdenum, vanadium, copper and antimony and one or more specific other metals and having a multicomponent structure are used for the gas-phase catalytic...
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6888026 |
Method for producing (meth)acrylic acid
An object of this invention is to provide a method for producing acrylic acid that enables to suppress adverse influence of byproducts during distillation and to accomplish long-term continuous...
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6878847 |
Catalyst for preparation of unsaturated aldehyde and unsaturated carboxylic acid
A catalyst useful for catalytic vapor-phase oxidation of isobutylene, t-butanol or propylene to produce respectively corresponding unsaturated aldehyde and unsaturated carboxylic acid is provided....
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6797839 |
Multi-metal oxide materials with a two-phase structure
Multimetal oxide materials containing molybdenum, vanadium, antimony, one or more of the elements W, Nb, Ta, Cr and Ce and nickel and, if required, one or more of the elements Cu, Zn, Co, Fe, Cd,...
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6794539 |
Method for producing multiple-phase multi-metal oxide materials
In a process for preparing a multiplephase multimetal oxide composition comprising Mo, V, Cu and, if desired, further elements, at least one phase is preformed separately and dispersed in a...
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