Automatic control of fluid blending

Claim 1

A PROCESS FOR CONTROLLING THE FILTERING OF A MIXTURE OF SOLUTION AND CATALYST WHICH COMPRISES FORMING A SOLUTION COMPRISING (1) THE POLYMERIC FORM OF AN OLEFIN THAT HAS BEEN POLYMERIZED BY CONTACING THE OLEFIN WITH A CATALYST COMPRISING CHROMIUM OXIDE AND AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, ZIRCONIA AND THORIA, AT LEAST A PART OF THE CHROMIUM BEING IN THE HEXAVAALENT STATE, AND (2) A SOLVENT FOR THE POLYMER, AND WHEREIN AT LEAST A PART OF THE SOLVENT IS ADDED TO SUCH A MIXTURE UPSTREAM OF A CATALYST FILTER ZONE, PASSING SUCH SOLUTION TO SAID CATALYST FILTERING ZONE, WITHDRAWING A FILTRATE THAT COMPRISES SAID SOLUTION FROM SAID FILTER ZONE, FLOWING AT LEAST A PORTION OF HTE FILTRATE SO WITHDRAWN BETWEEN THE PLATES OF A CAPACITOR WHILE APPLYING AN ALTERNATING CURRENT TO SAID PLATES AND THEREBY PRODUCING A FIRST SIGNAL THAT IS REPRESENTATIVE OF THE CONCENTRATION OF THE ABOVE-DESCRIBED POLYMER IN THE FILTRATE; CONVERTING SAID FIRST SIGNAL INTO A CONTROL SIGNAL; TRANSMITTING SAID CONTROL SIGNAL TO, AND APPLYING IT TO, A MEANS FOR ADDING SOLVENT TO A MIXTURE UPSTREAMOF SAID CATALYST FILTER ZONE; AND, IN RESPONSE TO SAID CONTROL SIGNAL, ADUSTING THE MEANS FOR ADDING TO CHANGE THE AMOUNT OF SOLVENT PASSED THERETHROUGH IN DIRECT PROPORTION TOT HE RATIO OF THE CONCENTRATION OF THE POLYMER AS DETERMINED BY SAID FLOWING WHILE APPLYING STEP TO PRESELECTED CONCENTRATION OF POLYMER.