| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 560215000 | Preparing esters from nitriles or amides | 7 |
| 20130338396 | PROCESS FOR PRODUCTION OF METHACRYLIC ACID ESTER HAVING INCREASED YIELD - This invention provides a method for producing α,β-unsaturated carboxylic acid esters in high yield from acetone cyanohydrin and sulfuric acid through the separation and concurrent catalytic conversion of reaction side products to additional α,β-unsaturated carboxylic acid ester product. The catalyst comprises at least one Group IA element and may include a porous support and/or a promoter element selected from at least one of phosphorous, boron, titanium, zinc, zirconium, tin, bismuth, cerium, and alkaline earth metals. The method for producing methacrylic acid esters, such as methylmethacrylate (MMA), comprises the steps of: i) providing an alkyl alcohol and an organic traction comprising an alkyl methacrylate, an alkyl α-hydroxyisobutyrate and an alkoxyisobutyrate; ii) vaporizing at least a portion of the organic fraction and at least a portion of the alkyl alcohol; iii) contacting the vaporized organic fraction and alcohol with a catalyst comprising at least one element selected from the group consisting of lithium, sodium, potassium, rubidium, cesium and francium, to convert the alkyl ahydroxyisobutyrate and alkyl alkoxyisobutyrate to additional alkyl methacrylate and produce a mixture comprising alkyl methacrylate, methacrylic acid, alkyl alcohol, and water. | 12-19-2013 |
| 20150045577 | METHOD FOR HYDROLYSING ACETONE CYANOHYDRIN - The present invention relates to a process for hydrolysis of acetone cyanohydrin (ACH) by means of sulphuric acid within the ACH sulpho process for preparation of methacrylic acid (MAA) or methyl methacrylate (MMA). | 02-12-2015 |
| 20110077424 | Process for recovering valued compounds from a stream derived from purification of methyl methacrylate - The present invention provides a method for extractive recovery and conversion of selected compounds, such as methacrylic acid (MAA) and 2-methacrylamide (MAM), from a stream derived from purification of methyl methacrylate (MMA) or methacrylic acid (MAA) produced via a conventional ACH route process. | 03-31-2011 |
| 20110060159 | PROCESS FOR PREPARING CARBOXAMIDES BY HYDROLYSING CARBONITRILES IN THE PRESENCE OF A CATALYST COMPRISING MANGANESE DIOXIDE - The present invention relates to a process for preparing carboxamides by hydrolysing carbonitriles in the presence of a catalyst comprising manganese dioxide, wherein the reaction mixture added to the catalyst comprising manganese dioxide has a pH in the range of 6.0 to 11.0 and the hydrolysis is performed in the presence of an oxidizing agent. | 03-10-2011 |
| 20100249449 | METHOD FOR AMIDATING OF NITRILE IN THE PRESENCE OF SULFURIC ACID - The present invention relates to a process for preparing carboxamides by amidating nitriles in the presence of sulphuric acid, wherein the reaction is performed in a Taylor reactor. The process enables a simple and inexpensive preparation of these compounds. The present invention further provides processes for preparing (meth)acrylamides and alkyl(meth)acrylates, which comprise an inventive amidation reaction. | 09-30-2010 |
| 20100069662 | INTEGRATED PROCESS AND APPARATUS FOR PREPARING ESTERS OF METHACRYLIC ACID FROM ACETONE AND HYDROCYANIC ACID - The subject-matter of the present invention relates in principle to a process for preparing alkyl esters of methacrylic acid and its conversion products, which can be used in a multitude of chemical synthesis processes which can lead to a wide variety of different further processing products, and to an apparatus for performing this process. | 03-18-2010 |
| 20110306784 | METHOD FOR PRODUCING A CARBOXYLIC ACID AMIDE FROM A CARBONYL COMPOUND AND HYDROCYANIC ACID - The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above. | 12-15-2011 |
