Lignosulfonate system for inhibition of calcium salt deposits

Relevance. The need to create reagent systems based on raw materials of domestic origin. A feature of the developed inhibitory system is the use of lignosulfonate as a product of "green chemistry". Lignosulfonate is a byproduct of chemical processing of a natural polymer – wood. Depending on the type of processed wood and the method of its delignification, the characteristics of lignosulfonates vary in terms of tannidity (tanning properties 12–36%), in terms of reducing sugars (3–16%), in terms of solids (46–52%), in terms of concentrate color and inhibitory ability against calcium salts (from 45 to 60%). Aim. Selection of a lignosulfonate matrix modifier to produce a salt deposition inhibitor with protection of more than 90%. Methods. Turbiscan technology based on multiple optical scanning of vials with samples of the lignosulfonate system in height with registration of two profiles: transmission and backscattering of laser radiation. Results and conclusions.Thelignosulfonatematrix was modified with phosphonicfunctionalgroups oxyethylidendiphosphonic acid(ethidronicacid)capable of creatingcompoundswith the propanechain of the lignosulfonatemonomerunit(phenylpropaneunit). The effectiveness of the inhibitoryability of the lignosulfonatesystemiscalculatedbythevalueof the TSI(TurbiscanStabilityIndex), which characterizes the sedimentationstability of the testedsamples. The stability of the samples is determined by the obtainedprofiles of changes in the signalsreceivedalong the height of the sampleandduring the testand is usedtoquantify the changes taking placein the testsample. The bestresults(92%) were obtainedon the basisof a lignosulfonate neutral-sulfiteproductionmethodwith a highcontent of reducingsugars,with a salt deposition inhibitoradditivecontent of nomore than 50mg/l. Presumably, the obtainedcompounds are classifiedasesters of alcoholgroups of lignosulfonateandphosphonicgroups of the reagentmodifier.