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8771476 Methods for inhibiting polymerization of vinyl aromatic compounds during extractive distillation  
High temperatures and oxygen exposure during extractive distillation can result in polymerization of vinyl aromatic compounds. In various embodiments, the present disclosure relates to methods for...
8491758 Process for inhibiting polymerization of (meth)acrylic acid and/or (meth)acrylic esters  
A process for inhibiting polymerization of (meth)acrylic acid and/or (meth)acrylic esters by introducing an oxygenous gas into the (meth)acrylic acid and/or the (meth)acrylic ester, in which the...
8337671 Method for purifying polymerizable compounds  
Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed...
8157969 Method and apparatus for minimizing accumulation of polymer on process equipment, especially safety devices  
Accumulation of polymer on equipment, which is in contact with polymerizable material during normal process operation, is minimized by the method and apparatus of the present invention. The method...
8118995 Process for inhibiting fouling in hydrocarbon processing  
A method for inhibiting the formation of fouling materials including contacting hydrocarbon media containing aldehyde compounds with an antifoulant while treating the hydrocarbon media with a...
8080140 Process for debottlenecking a system for the separation of a conjugated diolefin  
A process for debottlenecking a system for the separation of a conjugated diolefin the system including a first extraction section having an extractive distillation column and a stripping column...
7981255 Method for producing (meth)acrylic acid and (meth)acrylic esters  
There is provided a method for rectifying a vinyl compound liquor. The method includes the steps of a) providing a rectification column operated at a temperature and pressure and b) feeding the...
7892403 Handling device and producing system of easy-to-polymerize compound  
A condenser includes: a top face of a tube plate on which acrylic acid may be condensed inside the condenser; a spray for spreading a polymerization inhibitor on the tube plate; a first...
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 (1a) provided on a side wall...
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...
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...
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...
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...
7235158 Perforated tray column without downcomer  
A perforated tray without downcomer having only a small deviation between the opening ratio based on the diameter of a column and the actual opening ratio and a perforated tray column without...
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...
7128826 Polymerization inhibitor for styrene dehydrogenation units  
Quinone methide derivatives such as 4-benzylidene-2,6-di-tert-butyl-cyclohexa-2,5 dienone are used to inhibit styrene monomer polymerization in the dehydrogenator portion of a styrene monomer...
7128813 Process for manufacturing high purity methacrylic acid  
A process for the high yield production of high purity glacial methacrylic acid (“HPMAA”) with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure,...
7125475 Nitrosophenols and C-nitrosoanilines as polymerization inhibitors  
Inhibitor blends that include both nitrosophenols and nitrosoanilines, optionally in combination with air or oxygen, reduce the premature polymerization of ethylenically unsaturated monomers....
7119224 Preparation of (METH) acrylic acid and (METH) acrylic esters  
A process for preparing and/or working up mixtures by (meth)acrylic acid and/or (meth)acrylic ester in the presence of at least one polymerization inhibitor and at least one oxygenous gas, which...
7081185 Purification apparatus provided with low heat conductive member  
The object of this invention to provide an improved arrangement that enables to prevent adhesion of polymer on or around the inner wall of a purification apparatus directly equipped on the outer...
7048834 Method for purification of acrylic acid  
The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing...
7029556 Method for purifying (meth)acrylic monomers by distillation  
The invention concerns a method of purifying a (meth) acrylic monomer selected among (meth) acrylic acids and their esters, by distillation in the presence of at least a polymerisation inhibitor...
7022220 C-nitrosoaniline compounds and their blends as polymerization inhibitors  
Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of at least one inhibitor...
7014736 Apparatus and process for purification of acrylic acid family  
An apparatus and a process for purification of an acrylic acid family. The apparatus is an apparatus for distillation purification of the acrylic acid family encompassing acrylic acid and its...
6926820 Inhibition of viscosity increase and fouling in hydrocarbon streams including unsaturation  
A method of inhibiting fouling and viscosity increase in hydrocarbon streams including ethylenically unsaturated monomers is disclosed. The method includes the step of adding to the hydrocarbon...
6878239 Process for inhibiting a polymerization in a vacuum section of an easily polymerizable compound purification system  
A process for inhibiting a polymerization of an easily polymerizable compound purification system is disclosed. According to the present invention, the polymerization of the easily polymerizable...
6863779 Distillation of styrene  
A process for the distillation of vinylaromatic monomers in the presence of 4-tert-butylcatechol (TBC) and oxygen, wherein no aromatic nitro or amino compound is present in any effective amount....
6835288 Method for preventing undesired polymerization in a mixture of substances containing ethylenically unsaturated compounds  
A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically...
6695928 Method for production of (meth) acrylic acid and/or (meth)acrylic esters  
A method for the production of (meth)acrylic acid and/or a (meth)acrylic ester is provided. This method for the production of (meth)acrylic acid and/or a (meth)acrylic ester includes washing the...
6676808 Method for starting up distilling column  
A method for starting up a distilling column destined to handle an easily polymerizing compound-containing solution characterized by supplying at the start of the operation of the distilling...
6673212 Polymerization-inhibited distillation  
Identified herein are inhibitors which may be added to the boiling pot portion of a distillation apparatus prior to or during the distillation of an alkylene carbonate. The inhibitors retard the...
6649028 Column treating process and apparatus thereof  
The present invention provides a column treating method by use of a distillation column and so on, which method enables to effectively remove solid impurities such as precipitates and polymers...
6641700 Purifying apparatus possessing vapor dispersing device  
A purifying apparatus characterized by being equipped with a vapor dispersing device possessing in a vapor inlet part owned by the apparatus on the lateral inside thereof an opening part facing...
6632329 Distillation apparatus and distilling method  
A distillation apparatus is provided with a distillation tower, a reboiler, a bottom outflow pipe for drawing a liquid from the bottom of the distillation tower, and a pot provided between the...
6627047 Method for preventing polymerization in thin-film type evaporating device  
A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating...
6613196 Method for stopping purifying column  
A method for stopping a purifying column handling an easily polymerizing compound-containing solution is disclosed, which method is characterized by lowering the inner oxygen concentration of the...
6599397 Method for preventing polymerization of (meth)acrylic acid and esters thereof and method for the production thereof  
This method of preventing polymerization of methacrylic acid inn the process of its production is characterized by comprising using, in a refining column, a combination of...
6596129 Distillation process for easily polymerizable substance-containing solution  
The present invention provides: a process can be preventive of a polymerization in a distillation apparatus when distilling a solution containing easily polymerizable substances such as...
6592722 Polymerization inhibitor for vinyl-containing materials  
This invention relates to a process of inhibiting the polymerization of vinyl-containing materials through the use of an effective amount of a polymerization inhibitor comprising quinone diimide...
6585862 Apparatus and method for handling easily polymerizable compound  
The present invention provides an apparatus for handling an easily polymerizable compound such as (meth)acrylic acid which includes a tubular member that is furnished to a side wall of the...
6540881 Method for refining (meth)acrylic acid  
This invention relates to a method for preventing (meth)acrylic acid from polymerizing during the course of distillation. The method provides for refining (meth)acrylic acid by a procedure...
6494996 Process for removing water from aqueous methanol  
A process for separating water from methanol in an aqueous methanol initial mixture, including subjecting said mixture to azeotropic distillation in the presence of sufficient added methyl...
6475348 Mixture of substances containing compounds with vinyl groups and stabilizers  
A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component...
6409887 Polymerization inhibitor  
A monomer composition, stabilized against premature polymerization, comprising: a) an ethylenically unsaturated monomer or mixture of monomers polymerizable by free radical initiation, and b) an...
6409886 Process for inhibiting the polymerization of easily-polymerizable compounds  
In distillation of easily polymerizable compounds such as (meth)acrylic acid and (meth)acrylic esters using a distillation unit, a liquid having substantially the same composition with that of a...
6395140 Method for producing (meth)acrylic acid  
In a process for the preparation of (meth)acrylic acid from a mixture which contains (meth)acrylic acid and a solvent having a boiling point above the boiling point of (meth)acrylic acid by...
6352619 Method for purifying acrylic acid  
Process for purifying acrylic acid in order to remove the polymer-type impurities in those places in the distillation columns in which they have a tendency to accumulate, and more particularly a...
6350352 Process for separating by distillation pure (meth)acrylic acid from mixtures  
A process for distillative separation of pure (meth)acrylic acid from mixtures which include comprise (meth)acrylic acid and dimers and oligomers of (meth)acrylic acid and are essentially free...
6348136 Method and apparatus for the purification of vinyl aromatic compounds  
The present invention is directed to an apparatus and method for the distillation of a readily polymerizable vinyl aromatic compound employing a polymerization inhibitor. The vinyl aromatic...
6348135 Process for the purification of (meth) acrylic acid and/or its ester  
In a process for the purification of (meth)acrylic acid and/or its ester using a distillation unit containing a distillation column, a multitubular reboiler and a pipe connecting these elements,...

Matches 1 - 50 out of 188 1 2 3 4 >