Title: Recovery of noble light products in distillation residues obtd. during manufacture of acrylic acid or its ester
Application Number: 95121423 Application Date: 1995.12.12
Publication Number: 1140162 Publication Date: 1997.01.15
Approval Pub. Date: 2002.10.16 Granted Pub. Date: 2002.10.16
International Classifi-cation: C07C51/347;C07C57/04;C07C67/475;C07C69/54
Applicant(s) Name: Elf Atochem SA Address:
Inventor(s) Name: M. Fauconet;N. Richard;P. Delafin
Attorney & Agent: WU DAJIAN
Abstract:
    To recover these noble products consisting of acrylic acid monomer, acrylic ester monomers and alcohols, a thermal cracking is performed in the absence of catalyst on a mixture of heavy distillation residues originating, from the manufacture of acrylic acid and, from the manufacture of the esters, the light fraction originating from the dissociation reactions is continuously vaporized during the cracking operation and this light fraction is distilled in order to recover, after condensation, the required products. The process according to the invention may consist in conducting the cracking of the mixture of heavy residues, optionally preheated, in a reactor (R1); feeding a distillation column (C1) with the light cracking products; recovering the required mixture of light noble products at the head of column (C1); recycling the flow recovered at the foot of column (C1) into the reactor (R1); recovering the heavy residue from the reactor (R1) and sending it to a removal treatment.
Time: 4
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