丙烯酸精制工艺流程（Acrylic refining process）.doc

丙烯酸精制工艺流程（Acrylic refining process） 1 process 1.1 principle of production process This position is responsible for the high purity acrylic products that are refined into 99.5 (wt) by dehydrating, acetic acid and recombinant of the acrylic aqueous solution of the former post of acrylic. Production process flow statement 1.2.1 light component fractionation system The acrylic aqueous solution in 2T ‐ 201 (crude acrylic tank) is delivered to 2C ‐ 210 (light component fractionator) by 2P ‐ 201A/B (acrylic acid charging pump). In this case, FC ‐ 2032 and FC ‐ 2031 are used to control the loading. 2C ‐ 210 is plate-type tower, with 17 pieces of tower board and upper layer of filler. In 2C ‐ 210, water and acetic acid are separated from acrylic by azeotropic distillation. The azeotropic agent used is toluene. Water, acetic acid, and toluene as azeotrope by vacuum distillation from 2 c ‐ 210 top steamed, steaming from the 2 e ‐ 212 (2 c ‐ 210 overhead condenser) by CTW partial condensation, condensate into 2 d ‐ 211 (2 c ‐ 210 tower tank), no condensate gas into 2 e ‐ 213 emissions (2 c ‐ 210 tower air condenser) by CTW further condensation, condensate into the 2 d ‐ 211, also from 2 e ‐ 213 out of the non-condensable gas by water ring vacuum pump 2 p ‐ 216 a/B (2 c ‐ 210 vacuum pump) by 2 pd ‐ 216 (2 p ‐ 216 empty cans recycling tank) by 2 e ‐ 216 216 gas condenser (2 p ‐) non-condensable gas discharge the waste incineration system (U ‐ 600). In this case, the 2D ‐ 211 air pressure is controlled by PC ‐ 2002. 2D ‐ 211 is divided into two zones: water phase and toluene. The inflow of condensate is stratified in the aqueous phase, and the superphenylene in the upper layer is overflowed to the toluene area. The toluene in toluene is delivered from 2P ‐ 211A/B (2C ‐ 210tp-toluene reflux pump), and all the way through 2FC ‐ 2003 regulating control from 2C ‐ 210 to the tower; The liquid level of the toluene region was controlled by LC ‐ 2003 adjustment to 2T ‐ 202 (toluene can)