<?xml version="1.0" encoding="UTF-8" standalone="no"?><xbrli:xbrl xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:in-capmkt="https://www.sebi.gov.in/xbrl/2024-05-31/in-capmkt" xmlns:in-capmkt-ent="https://www.sebi.gov.in/xbrl/Notice_Of_Shareholders_Meeting/2024-05-31/in-capmkt/in-capmkt-ent" xmlns:in-capmkt-roles="https://www.sebi.gov.in/xbrl/Notice_Of_Shareholders_Meeting/2024-05-31/in-capmkt-roles" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:xlink="http://www.w3.org/1999/xlink"><link:schemaRef xlink:href="in-capmkt-ent-2024-05-31.xsd" xlink:type="simple"/><xbrli:context 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scheme="https://www.sebi.gov.in/in-capmkt/NSESymbol">SPIC</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:instant>2026-04-08</xbrli:instant></xbrli:period><xbrli:scenario><xbrldi:typedMember dimension="in-capmkt:ResolutionOrAgendaAxis"><in-capmkt:ResolutionOrAgendaDomain>ResolutionOrAgendaDomain4</in-capmkt:ResolutionOrAgendaDomain></xbrldi:typedMember></xbrli:scenario></xbrli:context><xbrli:unit id="INR"><xbrli:measure>iso4217:INR</xbrli:measure></xbrli:unit><xbrli:unit id="pure"><xbrli:measure>xbrli:pure</xbrli:measure></xbrli:unit><in-capmkt:NSESymbol contextRef="MainI">SPIC</in-capmkt:NSESymbol><in-capmkt:NameOfTheCompany contextRef="MainI">SOUTHERN PETROCHEMICALS INDUSTRIES CORPORATION  LIMITED</in-capmkt:NameOfTheCompany><in-capmkt:TypeOfAnnouncement contextRef="MainI">New</in-capmkt:TypeOfAnnouncement><in-capmkt:DateOfOccurrenceOfEvent contextRef="MainI">2026-04-08</in-capmkt:DateOfOccurrenceOfEvent><in-capmkt:TimeOfOccurrenceOfEvent contextRef="MainI">15:04:00</in-capmkt:TimeOfOccurrenceOfEvent><in-capmkt:EventForNoticeOfShareholdersMeeting contextRef="MainI">Postal Ballot</in-capmkt:EventForNoticeOfShareholdersMeeting><in-capmkt:ModeOfShareholdersMeeting contextRef="MainI">Postal Ballot</in-capmkt:ModeOfShareholdersMeeting><in-capmkt:NumberOfShareholdersMeeting contextRef="MainI">1/2026-27</in-capmkt:NumberOfShareholdersMeeting><in-capmkt:DayOfShareholdersMeeting contextRef="MainI">Thursday</in-capmkt:DayOfShareholdersMeeting><in-capmkt:DateOfShareholdersMeeting contextRef="MainI">2026-04-09</in-capmkt:DateOfShareholdersMeeting><in-capmkt:ShareholdersMeetingCommencementTime contextRef="MainI">09:00:00</in-capmkt:ShareholdersMeetingCommencementTime><in-capmkt:PlaceOfShareholdersMeeting contextRef="MainI">Chennai</in-capmkt:PlaceOfShareholdersMeeting><in-capmkt:EndDateOfPostalBallotVoting contextRef="MainI">2026-05-08</in-capmkt:EndDateOfPostalBallotVoting><in-capmkt:NumberOfAgendaOrBusinessToBeTransacted contextRef="MainI" decimals="0" unitRef="pure">4</in-capmkt:NumberOfAgendaOrBusinessToBeTransacted><in-capmkt:TypeOfResolution contextRef="I_DetailofResolution1">Special Resolution</in-capmkt:TypeOfResolution><in-capmkt:CategoryOfResolution contextRef="I_DetailofResolution1">Appointment/Re-appointment/Removal/Ratification/Retirement/Remuneration</in-capmkt:CategoryOfResolution><in-capmkt:SubCategoryOfResolution contextRef="I_DetailofResolution1">Appointment</in-capmkt:SubCategoryOfResolution><in-capmkt:BriefDetailsOfResolution contextRef="D_DetailofResolution1">Appointment of Mr. Manikkan Sangameswaran, (DIN: 00121885) as Independent Director of the Company for a period of five (5) years.</in-capmkt:BriefDetailsOfResolution><in-capmkt:DesignationOfDesignatedPerson contextRef="I_DetailofResolution1">Non-Executive - Independent Director</in-capmkt:DesignationOfDesignatedPerson><in-capmkt:NameOfDesignatedPerson contextRef="D_DetailofResolution1">Mr. Manikkan Sangameswaran</in-capmkt:NameOfDesignatedPerson><in-capmkt:DirectorIdentificationNumberOfDirector contextRef="D_DetailofResolution1">00121885</in-capmkt:DirectorIdentificationNumberOfDirector><in-capmkt:DateOfStartOfTenure contextRef="D_DetailofResolution1">2026-02-13</in-capmkt:DateOfStartOfTenure><in-capmkt:DateOfEndOfTenure contextRef="D_DetailofResolution1">2031-02-12</in-capmkt:DateOfEndOfTenure><in-capmkt:NumberOfTimesAppointed contextRef="D_DetailofResolution1" decimals="0" unitRef="pure">1</in-capmkt:NumberOfTimesAppointed><in-capmkt:TypeOfResolution contextRef="I_DetailofResolution2">Ordinary Resolution</in-capmkt:TypeOfResolution><in-capmkt:CategoryOfResolution contextRef="I_DetailofResolution2">Appointment/Re-appointment/Removal/Ratification/Retirement/Remuneration</in-capmkt:CategoryOfResolution><in-capmkt:SubCategoryOfResolution contextRef="I_DetailofResolution2">Appointment</in-capmkt:SubCategoryOfResolution><in-capmkt:BriefDetailsOfResolution contextRef="D_DetailofResolution2">Appointment of Mr. K R Anandan, (DIN: 00314502), as a Director of the Company under Section 160 of the Act.</in-capmkt:BriefDetailsOfResolution><in-capmkt:DesignationOfDesignatedPerson contextRef="I_DetailofResolution2">Executive Director</in-capmkt:DesignationOfDesignatedPerson><in-capmkt:NameOfDesignatedPerson contextRef="D_DetailofResolution2">Mr. K R Anandan</in-capmkt:NameOfDesignatedPerson><in-capmkt:DirectorIdentificationNumberOfDirector contextRef="D_DetailofResolution2">00314502</in-capmkt:DirectorIdentificationNumberOfDirector><in-capmkt:PANOfDesignatedPerson contextRef="D_DetailofResolution2">AAZPA1582C</in-capmkt:PANOfDesignatedPerson><in-capmkt:DateOfStartOfTenure contextRef="D_DetailofResolution2">2026-02-13</in-capmkt:DateOfStartOfTenure><in-capmkt:DateOfEndOfTenure contextRef="D_DetailofResolution2">2029-02-12</in-capmkt:DateOfEndOfTenure><in-capmkt:NumberOfTimesAppointed contextRef="D_DetailofResolution2" decimals="0" unitRef="pure">1</in-capmkt:NumberOfTimesAppointed><in-capmkt:TypeOfResolution contextRef="I_DetailofResolution3">Ordinary Resolution</in-capmkt:TypeOfResolution><in-capmkt:CategoryOfResolution contextRef="I_DetailofResolution3">Appointment/Re-appointment/Removal/Ratification/Retirement/Remuneration</in-capmkt:CategoryOfResolution><in-capmkt:SubCategoryOfResolution contextRef="I_DetailofResolution3">Appointment</in-capmkt:SubCategoryOfResolution><in-capmkt:BriefDetailsOfResolution contextRef="D_DetailofResolution3">Approval for appointment and remuneration of Mr. K R Anandan (DIN: 00314502) as Whole-Time Director of the Company from 13th February 2026 to 12th February 2029</in-capmkt:BriefDetailsOfResolution><in-capmkt:DesignationOfDesignatedPerson contextRef="I_DetailofResolution3">Executive Director</in-capmkt:DesignationOfDesignatedPerson><in-capmkt:NameOfDesignatedPerson contextRef="D_DetailofResolution3">Mr. K R Anandan</in-capmkt:NameOfDesignatedPerson><in-capmkt:DirectorIdentificationNumberOfDirector contextRef="D_DetailofResolution3">00314502</in-capmkt:DirectorIdentificationNumberOfDirector><in-capmkt:DateOfStartOfTenure contextRef="D_DetailofResolution3">2026-02-13</in-capmkt:DateOfStartOfTenure><in-capmkt:DateOfEndOfTenure contextRef="D_DetailofResolution3">2029-02-12</in-capmkt:DateOfEndOfTenure><in-capmkt:NumberOfTimesAppointed contextRef="D_DetailofResolution3" decimals="0" unitRef="pure">1</in-capmkt:NumberOfTimesAppointed><in-capmkt:TypeOfResolution contextRef="I_DetailofResolution4">Ordinary Resolution</in-capmkt:TypeOfResolution><in-capmkt:CategoryOfResolution contextRef="I_DetailofResolution4">Appointment/Re-appointment/Removal/Ratification/Retirement/Remuneration</in-capmkt:CategoryOfResolution><in-capmkt:SubCategoryOfResolution contextRef="I_DetailofResolution4">Remuneration</in-capmkt:SubCategoryOfResolution><in-capmkt:BriefDetailsOfResolution contextRef="D_DetailofResolution4">Payment of Special Incentive to Mr. E Balu, Whole-Time Director (DIN: 08773795) for the Financial Year 2024-25</in-capmkt:BriefDetailsOfResolution><in-capmkt:DesignationOfDesignatedPerson contextRef="I_DetailofResolution4">Executive Director</in-capmkt:DesignationOfDesignatedPerson><in-capmkt:NameOfDesignatedPerson contextRef="D_DetailofResolution4">Mr. E Balu (late)</in-capmkt:NameOfDesignatedPerson><in-capmkt:DirectorIdentificationNumberOfDirector contextRef="D_DetailofResolution4">08773795</in-capmkt:DirectorIdentificationNumberOfDirector><in-capmkt:PANOfDesignatedPerson contextRef="D_DetailofResolution4">AECPB3928G</in-capmkt:PANOfDesignatedPerson><in-capmkt:DateOfStartOfTenure contextRef="D_DetailofResolution4">2024-04-01</in-capmkt:DateOfStartOfTenure><in-capmkt:DateOfEndOfTenure contextRef="D_DetailofResolution4">2025-03-31</in-capmkt:DateOfEndOfTenure><in-capmkt:AmountOfRemuneration contextRef="D_DetailofResolution4" decimals="0" unitRef="INR">1500000</in-capmkt:AmountOfRemuneration></xbrli:xbrl>