Method of decomposing by-product during the production of (meth)acrylic ester
申请人:MITSUBISHI CHEMICAL CORPORATION
公开号:US20040225149A1
公开(公告)日:2004-11-11
A problem of the invention is to provide a method of decomposing a Michael addition reaction product formed as a by-product in the production step of a (meth)acrylic ester and recovering (meth)acrylic acid, a (meth)acrylic ester and an alcohol, in which the formation of an olefin as a by-product can be suppressed.
The invention relates to a method of thermally decomposing a by-product at the time of production of a (meth)acrylic ester using an alcohol bearing a branched chain and having 3 or more carbon atoms, wherein the decomposition reaction is carried out in the absence of a catalyst.
Method of recovering 2-ethylhexyl alcohol from a mixture comprising 2-ethylhexyl acrylate
申请人:——
公开号:US20040192957A1
公开(公告)日:2004-09-30
A process is disclosed for the production of 2-ethylhexyl acrylate which includes a method of recycling unreacted 2-ethylhexyl alcohol. A liquid side stream draw containing about or greater than 65% alcohol, is taken from the top one third of the light ends recovery tower. By employing a side stream, 2-ethylhexyl alcohol can be recovered and directly recycled to the 2-ethylhexyl acrylate reactor thereby increasing raw material efficiency and avoiding problematic emulsion issues associated with use of other in-process streams.
The invention provides a process for producing and/or purifying acrylic acid or methacrylic acid and an ester of these, wherein high-boiling heavy ingredients (high-boiling matters) discharged from individual step units are classified by the content therein of (meth)acrylic acid and/or of the dimer thereof and treated. According to the invention, even when high-boiling matters which have been discharged from distillation columns, high-boiling-matter cracking reactors, and the like in a plant for producing (meth)acrylic acid and/or an ester thereof and are alike in liquid nature are mixed with each other in the same tank, no polymer precipitation occurs. The handling and storage thereof are hence easy. Consequently, tanks can be united into one, and the process is extremely advantageous in reducing the construction cost and the area necessary for equipment.