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7622607 |
Method for purifying (meth)acrylic acid obtained by oxidizing a gaseous substrate
The present invention relates to a method for purifying (meth)acrylic acid obtained by catalytic or redox oxidation of a gaseous substrate constituting propane, propylene, acrolein, isobutane,...
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7612231 |
Method for recovering acrylic acid
Disclosed is a simplified method for recovering acrylic acid from a mixture containing acrylic acid, acrylic acid dimer and impurities with high boiling point, in a stable and efficient manner. The...
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7601866 |
Process for removing methacrolein from liquid phase comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component
A process for removing methacrolein from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component in which the removal is effected...
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7601865 |
Recovery of organic acids
A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. A tertiary amine and CO 2 are introduced to...
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7589236 |
Process for separating acrylic acid and benzoic acid present in a product gas mixture of a partial heterogeneously catalyzed gas phase oxidation of a C3 precursor compound of acrylic acid
A process for separating acrylic acid and benzoic acid present in the product gas mixture of a partial oxidation to acrylic acid, in which the acrylic acid and the benzoic acid are first converted...
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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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7560590 |
Rectificative separation of an acrylic acid-containing liquid
A process for rectificatively separating an acrylic acid-containing liquid, by withdrawing an acrylic acid-rich stream from the rectification column above the feed point and...
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7557246 |
Method for the purification of (meth)acrylic acid
The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously...
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7557245 |
(Meth)acrylic acid crystal and process for producing aqueous (meth)acrylic acid
The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of...
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7541417 |
Process for the purification of dihydric phenols
A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal...
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7540884 |
Method for performing the purifying separation of crystals out their suspension in a mother liquor
A process for purifying removal of crystals from their suspension in mother liquor by means of a washing column having forced transport in which the process chamber is encased by a metal wall...
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7538245 |
Process for the manufacture of an enantiopure compound
Process for the manufacture of an enantiopure compound comprising at least one functional group capable of reacting with an activated carboxyl group, starting from a mixture of enantiomers of the...
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7528210 |
Method of purification of dihydric phenols
A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an...
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7520964 |
Method for the rectifying separation of fluids containing (meth)acryl monomers
A process for rectificatively separating at least one (meth)acrylic monomer-containing fluid by feeding the fluid into a rectification column containing at least one sieve tray without a runoff...
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7514581 |
Method for purifying and producing acrylic acid
The objective of the present invention is to provide methods of efficiently purifying and producing acrylic acid by removing solid acrylic acid polymers dissolving and existing in crude acrylic...
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7495129 |
Purification of a monomer by extraction with a phase former and crystallization
The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an...
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7476299 |
Vessel for easily polymerizable compound
A decomposition reaction apparatus or distillation apparatus for acrylic acid in which a column bottom liquid heated in a reboiler ( 5 ) is supplied from a supply port ( 1 a ) provided on a side...
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7414150 |
Method for purifying (meth)acrylic acid
A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid...
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7396957 |
Process for producing (meth)acrylic acids and process for distilling the same
In the stopping and starting operations of a distillation column used for producing (meth)acrylic acids according to the present invention, upon stopping the operation of the distillation column,...
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7393976 |
Process for manufacturing reduced water content (meth)acrylic acid
A method is provided herein for purifying (meth)acrylic acid to provide a purified (meth)acrylic acid product having a low aldehyde concentration and not more than 0.2 wt % water. One embodiment of...
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7393436 |
Thermal separating process for removing at least one stream containing enriched (meth) acrylic monomers
A thermal separating process for removing a stream containing enriched (meth)acrylic monomers from a mixture containing (meth)acrylic monomers, in which the liquid phases retained in the separating...
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7381839 |
Method for producing acrylic acid
The objective of the present invention is to provide method for acrylic acid in which a generation of polymerized substance is prevented while acrylic acid is stored in a storage tank. A method of...
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7368602 |
Process for producing (meth) acrylic acid
There is provided a process for producing (meth)acrylic acid including an absorption step of bringing a (meth)acrylic acid-containing gas obtained by a gas phase catalytic oxidation method into an...
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7351396 |
Extraction process for removal of impurities from an aqueous mixture
A method for removing impurities from an aqueous mixture or purified aqueous by extracting the aqueous mixture or purified aqueous mixture with an extraction solvent in an extraction zone to form...
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7351310 |
Rectificative separation of fluids comprising (meth) acrylic monomers
A process for rectificatively separating fluids including (meth)acrylic monomers in a rectification column by directly cooling the vapor including (meth)acrylic monomers rising to the top of the...
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7342130 |
Method for producing acrylic acid
A method for producing acrylic acid, comprising (a) a absorption step of absorbing acrylic acid-containing gas obtained by oxidizing raw material gas in gas phase as crude acrylic acid-containing...
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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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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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7326323 |
High capacity purification of thermally unstable compounds
Separations processes and apparati capable of purifying thermally sensitive materials at high capacity. An apparatus having a rectification section and a stripping section with the stripping...
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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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7319169 |
Method for producing (meth) acrylic acid
The present invention relates to a method for producing (meth)acrylic acid comprising a process of recovering (meth)acrylic acid as an aqueous (meth)acrylic acid from a (meth) acrylic...
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7319168 |
Process for producing aliphatic carboxylic acid
It is an object of the present invention to provide a process for producing aliphatic carboxylic acid, which can stabilize operation of a distillation column upon production of aliphatic carboxylic...
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7319167 |
Method for distilling (meth)acrylic acid and/or the ester thereof
A method for distilling (meth)acrylic acid and/or the ester thereof by withdrawing vapor generated in a distillation column by distillation from the top of the column, condensing the vapor to give...
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7319166 |
Method of purifying a raw melt of at least one monomer by crystallization
The invention relates to a method for purifying a raw melt of at least one monomer by crystallization, wherein suspension crystallization is initially used and the resulting remaining melt or the...
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7307189 |
Method for discontinuous purification of crude acrylic acid by means of crystallization
Crude acrylic acid is purified batchwise by crystallization by a process which comprises at least one purification stage and at least one stripping stage and in which at least the first stripping...
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7307132 |
Method for producing low-odor hydrogel-forming polymers
This invention relates to a process for preparing a low-odor hydrogel-forming acrylic acid polymer, which comprises the steps of: a) preparing a polymeric hydrogel by free-radically polymerizing a...
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7304176 |
Process for producing easily polymerizable substance
It is an object of the present invention to provide a process for producing easily polymerizable substance, which can realize stable operation of a purification system, and can stably maintain a...
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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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7282118 |
Method for production of easily polymerizable substance and purification apparatus
This invention resides in providing a method for the prevention of possible polymerization of the easily polymerizable substance during the purification thereof by a column provided with (a) at...
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7279598 |
Process for separating and recovering 3-hydroxypropionic acid and acrylic acid
Disclosed is a process for separating and recovering 3-hydroxypropionic acid from an aqueous solution comprising 3-hydroxypropionic acid and acrylic acid, comprising counter current extracting the...
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7279075 |
Thermal separating process between at least one gaseous and at least one liquid stream, of which at least one comprises (meth)acrylic monomers
In a thermal separating process between at least one gaseous and at least one liquid stream, of which at least one comprises (meth)acrylic monomers, in a separating column containing sieve trays as...
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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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7253314 |
Method for refining easily polymerizable matter-containing substance and apparatus therefor
A method for refining an easily polymerizable matter while preventing an easily polymerizable matter-containing substance from being polymerized and an apparatus for use in the method are...
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7253313 |
Method for purifying (meth)acrylic acid by oxidising a gaseous substrate
The present invention relates to a method for purifying (meth)acrylic acid obtained by oxidizing propane, propylene, acrolein, isobutane, isobutene, ter-butyl alcohol, (meth)acrolein and mixtures...
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7244863 |
Process for producing (meth)acrylic acid compound
The invention provides a process for producing and/or purifying acrylic acid or methacrylic acid or an ester of any of these, wherein mixtures of high-boiling heavy ingredients (high-boiling matter...
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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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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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7157598 |
Method for producing an aqueous alkali acrylate solution
A process prepares an aqueous alkali metal acrylate solution by distillatively removing acrylic acid from a mixture as vapors and taking up the vapors immediately from the gas phase into an aqueous...
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7151194 |
Method for production of acrylic acid
A method for producing acrylic acid from an acrylic acid-containing solution of high concentration without performing azeotropic distillation is provided. This method of producing acrylic acid...
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