PROCESSO E DISPOSITIVO PARA O PREPARO DE ÁCIDO ACRÍLICO, ÁCIDO ACRÍLICO E USO DO MESMO, PROCESSO E DISPOSITIVO PARA O PREPARO DE POLIACRILATOS, POLIACRILATO, FIBRAS, FILMES, COMPOSIÇÕES MOLDÁVEIS, AUXILIARES TÊXTEIS E DE COUROS, AGENTES FLOCULANTES, REVESTIMENTO OU LACAS BASEADOS EM ÁCIDO ACRÍLICO

摘要

The invention relates to a process for the preparation of acrylic acid and a process for the preparation of polyacrylic acid comprising the process steps: (a1) preparation of 3-hydroxypropionic acid from a biological material to give a fluid, in particular aqueous, phase containing 3-hydroxypropionic acid; (a2) dehydration of the 3-hydroxypropionic acid to give a fluid, in particular aqueous, solution containing acrylic acid; (a3) purification of the solution containing acrylic acid by a suspension crystallization or a layer crystallization to give a purified phase; and corresponding devices for carrying out these processes, and acrylic acid and polyacrylates. The invention is distinguished in that acrylic acid and polyacrylates can thereby be prepared efficiently, inexpensively, and sustainably with simple means and with a high purity on the basis of regenerable raw materials.