Patent RU-2513741-C2 (RU)
Inventor: SHLIPKHAKE FOL KER
IPC: C07C51/377
Filed: 2009-11-30
Granted: 2014-04-20
Abstract: FIELD: chemistry. 
     SUBSTANCE: invention relates to method of reverse splitting of Michael adducts, contained in fluid F with weight part ≥ 10 wt %, counted per liquid F weight, which were formed in the process of obtaining acrylic acid or its esters, in installation of reverse splitting, which includes, at least, one pump P, separation column C, which from bottom to top consists of bottom part, separating part, which is adjacent to bottom part and contains internal devices with separating effect, and head part, which follows it, in which pressure in gaseous phase decreases from bottom to top, as well as indirect heat exchanger with circulation of heat carrier UW, which has, at least, one secondary volume and, at least, one primary volume, separated from said, at least, one secondary volume by means of real separating wall D, in which fluid F with supply temperature T Z  is continuously introduced into separation column C in point of supply I, which is located in said separation column C above the lowest internal device with separating effect; expenditure flow        M   ˙         
 of fluid F with temperature T SU , flowing into bottom part through internal devices with separating effect, containing Michael adducts, is continuously taken away in located at the lowest level of bottom part of column C by means of pump P, in such a way that in bottom part as bottom fluid set is level S of fluid, flowing into it, which constitutes less than half of distance A, measured from point of separating column C, located at the lowest level, to lower surface of the lowest internal device with separating effect in separation column C, while in the remaining volume of bottom part, located above said level of fluid, pressure of gas GD exists, as well as, at least, one partial flow I from expenditure flow          M   ˙     *         
 is passed through, at least, one secondary volume of indirect heat exchanger with circulation of heat carrier UW, and by indirect heat exchange with liquid heat carrier, passed simultaneously through, at least, one primary volume of said indirect heat exchanger with circulation of heat carrier UW, is heated to temperature of reverse splitting T RS , which is above temperature T SU ; and from removed from, at least, one secondary volume of indirect heat exchanger with circulation of heat carrier UW with temperature T RS  flow of substance        M   ˙         
 in point of supply II, which is below the lowest internal element with separating effect of separation column C and above level S of bottom fluid, at least, one partial flow II is supplied back into bottom part of separation column C in such a way that said, at least, one partial flow II in bottom part of separation column C is not directed on bottom fluid, and, at least, from one of two flows         M   ˙         
,          M   ˙     *         
 discharged is partial flow as residual flow on condition that temperature of reverse splitting T RS  is set in such a way that, on one hand, in the process of passage of, at least, one secondary volume of indirect heat exchanger with circulation of heat carrier UW, at least, part of Michael adducts, contained in, at least, one partial flow I, are split with formation of respective to them products of reverse splitting, as well as, on the other hand, at least, one partial flow II, supplied back into separation column C, under existing in bottom part in point of supply II gas pressure GD, is boiling, and gaseous phase, which is formed in the process of boiling, containing, at least, partial amount of product of reverse splitting, is supplied into head part of column C as gas flow G, containing product of reverse splitting, following decreasing towards head part of column C gas pressure, and said gas flow G by direct and/or indirect cooling is partially condensed still in head part of separation column C and/or being discharged from head part of separation column C, condensate, formed in this process is, at least, partially returned to separation column C as reflux fluid, and gas flow, remaining in the process of partial condensation, is discharged, with pump P representing radial centrifugal pump with semi-open radial working wheel. Coefficient of efficiency Q of claimed method constitutes at least 20%. 
     EFFECT: improvement of method. 
     14 cl, 9 dwg