A purification route of bio-acrylic acid by melt crystallization respectful of environmental constraints

作者：Mostefa Marie Le Page^*; Muhr Herve; P****ri Edouard; Fauconet Michel

来源：Powder Technology, 2014, 255: 98-102.

DOI：10.1016/j.powtec.2013.09.014

• Melt crystallization
• Falling film
• Acrylic acid
• Purification process
• Propionic acid

Bio-acrylic acid (AA) is produced from glycerol, a by-product of biodiesel production and oleochemistty. However, conventional purification techniques cannot purify this biobased AA owing to its impurity profile and the significant content of propionic add (PA). The liquid-solid phase diagram of the binary AA + PA shows that acrylic add crystallizes as a pure form from melts containing between 50 and 100% (mol/mol) of AA. Thus, a new falling film melt crystallization device has been developed and tested in which: %26lt;br%26gt;- supercooling is limited by the use of a crystallization surface made of 316L stainless steel, %26lt;br%26gt;- melt is thermostated, %26lt;br%26gt;- visual observation of the crystal layer is possible, and %26lt;br%26gt;- morphology of the crystal layer limits the retention of impure liquid. %26lt;br%26gt;Purification tests in this falling film device show that AA is separated from the PA in reduced crystallization cycle times and high crystallization yields.

• 出版日期2014-3