AR010258A1 - Proceso continuo en lecho fluidificado para la polimerizacion de olefinas en fase gaseosa y la tobera que se usa en dicho proceso - Google Patents

Proceso continuo en lecho fluidificado para la polimerizacion de olefinas en fase gaseosa y la tobera que se usa en dicho proceso

Info

Publication number
AR010258A1
AR010258A1 ARP970105052A ARP970105052A AR010258A1 AR 010258 A1 AR010258 A1 AR 010258A1 AR P970105052 A ARP970105052 A AR P970105052A AR P970105052 A ARP970105052 A AR P970105052A AR 010258 A1 AR010258 A1 AR 010258A1
Authority
AR
Argentina
Prior art keywords
nozzle
liquid
olefins
polymerization
fluidized bed
Prior art date
Application number
ARP970105052A
Other languages
English (en)
Original Assignee
Bp Chem Int Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bp Chem Int Ltd filed Critical Bp Chem Int Ltd
Publication of AR010258A1 publication Critical patent/AR010258A1/es

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1818—Feeding of the fluidising gas
    • B01J8/1827—Feeding of the fluidising gas the fluidising gas being a reactant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/26—Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/265—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being symmetrically deflected about the axis of the nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/267—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being deflected in determined directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
    • B05B7/0458—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber the gas and liquid flows being perpendicular just upstream the mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00026—Controlling or regulating the heat exchange system
    • B01J2208/00035—Controlling or regulating the heat exchange system involving measured parameters
    • B01J2208/00044—Temperature measurement
    • B01J2208/00061—Temperature measurement of the reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00106—Controlling the temperature by indirect heat exchange
    • B01J2208/00168—Controlling the temperature by indirect heat exchange with heat exchange elements outside the bed of solid particles
    • B01J2208/00256—Controlling the temperature by indirect heat exchange with heat exchange elements outside the bed of solid particles in a heat exchanger for the heat exchange medium separate from the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00106—Controlling the temperature by indirect heat exchange
    • B01J2208/00265—Part of all of the reactants being heated or cooled outside the reactor while recycling
    • B01J2208/00274—Part of all of the reactants being heated or cooled outside the reactor while recycling involving reactant vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00327—Controlling the temperature by direct heat exchange
    • B01J2208/00336—Controlling the temperature by direct heat exchange adding a temperature modifying medium to the reactants
    • B01J2208/00353—Non-cryogenic fluids
    • B01J2208/00362—Liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00548—Flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/0061—Controlling the level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/901—Monomer polymerized in vapor state in presence of transition metal containing catalyst

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Polymerisation Methods In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Nozzles (AREA)

Abstract

Un proceso continuo en lecho fluidificado por gas para la polimerizacion de olefinas, especialmente etileno, propileno o mezclas de las mimsas conotras alfa-olefinas, mediante enfriamiento de la corriente de gas de reciclo para condensar partede líquido (por ejemplo, un comonomero), separacion de almenos parte del líquido y pulverizacion del mismo a presion a través de una tobera directamente al lecho fluidificado por presurizacion del líquido yalimentacion del mismo a una toberapulv erizadora que tiene un dispositivo mecánico para atomizar el líquido, bajo condiciones tales que la pulverizacionse forma dentro de una zona formadora de pulverizacion de la salida de la tobera. La zona formadora de la pulverizacionestá p rotegida preferentementede las partículas del lecho fluidifcado mediante una pared o paredes que pueden ser, por ejemplo, un tubo o una placa. También se describe una toberaque tiene dos o más series de salidas, siendo alimentada ycontrolada cada una de las series de manera independiente para permitir un aumento/reduccionmejorado del suministro de líquido al lecho.
ARP970105052A 1996-10-31 1997-10-30 Proceso continuo en lecho fluidificado para la polimerizacion de olefinas en fase gaseosa y la tobera que se usa en dicho proceso AR010258A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9622715.2A GB9622715D0 (en) 1996-10-31 1996-10-31 Nozzle

Publications (1)

Publication Number Publication Date
AR010258A1 true AR010258A1 (es) 2000-06-07

Family

ID=10802254

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP970105052A AR010258A1 (es) 1996-10-31 1997-10-30 Proceso continuo en lecho fluidificado para la polimerizacion de olefinas en fase gaseosa y la tobera que se usa en dicho proceso

Country Status (30)

Country Link
US (1) US6214943B1 (es)
EP (1) EP0938372B1 (es)
JP (1) JP2001503318A (es)
KR (1) KR100466302B1 (es)
CN (1) CN1115193C (es)
AR (1) AR010258A1 (es)
AT (1) ATE222799T1 (es)
AU (1) AU715615B2 (es)
BG (1) BG64078B1 (es)
BR (1) BR9712612A (es)
CA (1) CA2270049C (es)
DE (1) DE69715027T2 (es)
DZ (1) DZ2342A1 (es)
EA (1) EA002084B1 (es)
EG (1) EG21518A (es)
ES (1) ES2183143T3 (es)
GB (1) GB9622715D0 (es)
HU (1) HU224477B1 (es)
ID (1) ID21359A (es)
MY (1) MY122144A (es)
NO (1) NO992078L (es)
NZ (1) NZ335267A (es)
PL (1) PL189074B1 (es)
PT (1) PT938372E (es)
SK (1) SK283622B6 (es)
TR (1) TR199900937T2 (es)
TW (1) TW413684B (es)
UA (1) UA51743C2 (es)
WO (1) WO1998018548A1 (es)
ZA (1) ZA979619B (es)

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Publication number Priority date Publication date Assignee Title
US6306981B1 (en) 1999-04-02 2001-10-23 Union Carbide Chemicals & Plastics Technology Corporation Gas phase polymerization process
FR2792853B1 (fr) 1999-04-30 2001-07-06 Bp Chemicals Snc Buse a ressort avec fente de 360 degres, pour l'injection de liquide dans un reacteur a lit fluidise
FR2792852B1 (fr) * 1999-04-30 2002-03-29 Bp Chemicals Snc Buse a ressort avec orifices
DE10052606A1 (de) * 2000-10-24 2002-08-08 Xcellsis Gmbh Vorrichtung zur Rückführung kondensierter Flüssigkeit in einen Gasstrom
JP5166662B2 (ja) * 2001-09-27 2013-03-21 出光興産株式会社 α−オレフィン低重合体の製造方法
WO2008042182A1 (en) * 2006-10-03 2008-04-10 Univation Technologies, Llc Method for preventing catalyst agglomeration based on production rate changes
EP2118151B1 (en) * 2007-03-06 2011-11-30 Univation Technologies, LLC Methods and devices for polymerization
EP2288579B1 (en) * 2008-04-04 2016-12-14 Neos International, Llc System of water treatment
WO2010077606A1 (en) * 2008-12-08 2010-07-08 Rensselaer Polytechnic Institute Redox-initiated cationic polymerization using vapor-state reducing agents
US8921627B2 (en) * 2008-12-12 2014-12-30 Uop Llc Production of diesel fuel from biorenewable feedstocks using non-flashing quench liquid
EP2441512A1 (en) * 2010-10-14 2012-04-18 Linde Aktiengesellschaft Injector
US8900443B2 (en) 2011-04-07 2014-12-02 Uop Llc Method for multi-staged hydroprocessing using quench liquid
EP2766096A4 (en) * 2011-10-14 2015-11-18 Utc Fire & Security Corp SPRAY SYSTEM COMPRISING A MIXING DEVICE BEFORE A SPRAYER
CA2878582C (en) * 2012-07-31 2021-02-16 Univation Technologies, Llc Methods and systems for olefin polymerization
KR101534149B1 (ko) 2013-11-29 2015-07-03 롯데케미칼 주식회사 폴리올레핀의 정제 방법
CN103980084B (zh) * 2014-06-03 2016-03-09 上海华畅环保设备发展有限公司 乙叉降冰片烯的连续异构合成方法及装置
CN106422984B (zh) * 2015-08-07 2019-01-18 中国石油天然气股份有限公司 液体进料雾化装置、气相流化床反应器及聚烯烃生产装置
CN105646758B (zh) * 2016-03-25 2017-12-26 浙江大学 一种制备聚合物的方法
CN107063907A (zh) * 2017-03-31 2017-08-18 浙江理工大学 一种用于测量固液两相磨损的试验装置
US10710109B2 (en) * 2017-11-14 2020-07-14 General Electric Company Spray nozzle device for delivering a restorative coating through a hole in a case of a turbine engine
US11161128B2 (en) 2017-11-14 2021-11-02 General Electric Company Spray nozzle device for delivering a restorative coating through a hole in a case of a turbine engine
US11534780B2 (en) 2017-11-14 2022-12-27 General Electric Company Spray nozzle device for delivering a restorative coating through a hole in a case of a turbine engine
CN108948248B (zh) * 2018-06-26 2020-12-01 中国石油天然气股份有限公司 一种气相法生产聚烯烃弹性体的方法、装置及聚烯烃弹性体的应用

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628734A (en) * 1970-03-11 1971-12-21 Georgia Pacific Corp Nozzle for dispersing viscous fluids
US4238453A (en) * 1978-12-04 1980-12-09 National Distillers And Chemical Corporation Catalyst spray nozzle
CA1241525A (en) * 1984-08-24 1988-09-06 Larry L. Simpson Fluidized bed polymerization reactors
ZA943399B (en) * 1993-05-20 1995-11-17 Bp Chem Int Ltd Polymerisation process
GB9524038D0 (en) * 1995-11-23 1996-01-24 Bp Chem Int Ltd Nozzle

Also Published As

Publication number Publication date
NO992078D0 (no) 1999-04-29
KR100466302B1 (ko) 2005-01-13
EP0938372B1 (en) 2002-08-28
CN1115193C (zh) 2003-07-23
AU715615B2 (en) 2000-02-03
AU4717397A (en) 1998-05-22
CA2270049A1 (en) 1998-05-07
SK283622B6 (sk) 2003-10-07
BG103431A (en) 2000-01-31
NO992078L (no) 1999-06-30
TW413684B (en) 2000-12-01
DE69715027D1 (de) 2002-10-02
GB9622715D0 (en) 1997-01-08
EG21518A (en) 2001-11-28
BR9712612A (pt) 1999-10-26
TR199900937T2 (xx) 1999-08-23
JP2001503318A (ja) 2001-03-13
ID21359A (id) 1999-05-27
EA002084B1 (ru) 2001-12-24
CA2270049C (en) 2006-07-25
MY122144A (en) 2006-03-31
HUP9904298A2 (hu) 2000-04-28
US6214943B1 (en) 2001-04-10
HU224477B1 (hu) 2005-09-28
UA51743C2 (uk) 2002-12-16
ZA979619B (en) 1998-05-21
KR20000052958A (ko) 2000-08-25
PL333020A1 (en) 1999-11-08
NZ335267A (en) 2000-10-27
DZ2342A1 (fr) 2004-06-20
ATE222799T1 (de) 2002-09-15
PT938372E (pt) 2002-12-31
PL189074B1 (pl) 2005-06-30
HUP9904298A3 (en) 2000-05-29
SK53799A3 (en) 2000-02-14
EP0938372A1 (en) 1999-09-01
BG64078B1 (bg) 2003-12-31
CN1242716A (zh) 2000-01-26
WO1998018548A1 (en) 1998-05-07
DE69715027T2 (de) 2002-12-19
EA199900386A1 (ru) 1999-12-29
ES2183143T3 (es) 2003-03-16

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