PEQUIVEN Petroquímica de Venezuela, S.A. Complejo Zulia C!"ACI#N $I"EC%A Planta &VC II
&ANUA $E !PE"ACI#N
Pro'rama de Adie(tramiento en el %ra)ajo %ra)ajo *A.E.%+
&arzo -
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&ANUA $E !PE"ACI#N E C!N%ENI$! C!N%ENI$! $E ES%E &ANUA ES ES UNA "EC!PIACI!N "EC!PIACI!N $E !S SI/UIEN%ES &ANUAES0 1.
&ANUA &ANUA E1EC E1ECUCI UCI#N #N $E A P"!$U P"!$UCCI CCI#N #N *IS! *IS!
222+. &ANUA %3CNIC! *IS!222+ 3. &ANUA $E "IES/!S P!" PUES%!S $E %"A4A1! $E A PAN%A &VC II. 2.
N!%A0 A IN5!"&ACI!N IN5!"&A CI!N AQU6 P"ESEN% P"ESEN %A$A QUE 5!"&A PA"%E $E !S &ANUAES $E IS! S!2222 S!N S!N C!PIAS N! C!N%"!A$AS, P!" ! CUA C!NS%I%U7EN $!CU&EN%!S "E5E"ENCIAES. A &!&EN%! $E SU U%IIZACI#N PA"A 5INES $E A$IES% A$IES%"A& "A&IEN IEN%! %! $E4E"8 $E4E"8 C!NSU C!NSU% %A"SE A"SE $E SIS% SIS%E& E&A A $E A CAI CAI$A $A$, $, QU QUE E INC INCU7 U7EN EN E SE SE! ! $E 9$ 9$!C !CU& U&EN EN% %! C! C!N% N%"! "!A A$! $!:, :, ! CUA /A"AN%IZA QUE ES ;%I&A VE"SI#N $E !S &IS&!S.
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Cloraci! Direc"a Direc"a
UNIDAD %00 INDICE
P<'. I. $E5INICI#N $E %E"&IN!S
=
II. %E!"IA $E P"!CES!
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III. $ESC"IPCI#N $E P"!CES!
--
IV. VA"IA4ES $E P"!CES!
-?
-. Composición del Etileno
-?
Composición del Cloro @. Co
-
?. Relación alimentación Etileno/Cloro
-
. Temperatura del Reactor Principal R-101
-
B. Presión del Reactor principal R-101.
-B
C oncentración de Catalizador . Co
-B
=. Producción de EDC hacia puriicación
-B
>. Temperatura del reactor R-102
-B
. Presión del reactor R-102
-
-2. Concentración de Etileno en los !enteos de los reactores "R-101 # R-102$
-
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V. A""ANQUE $E A UNI$A$
-
-. Pur'a de los E(uipos
-
@. )ecado de la *nidad
-=
?. Preparación para la introducción del ni!el de 1+2 dicloroetano "EDC$
. ,ntroducción de limentación de Cloro # etileno VI. !PE"ACI#N N!"&A 7 C!N%"! $E P"!CES!
- @2 @-
-. ,ntroducción
@-
@. peración ormal
@@
@.-. Condiciones de peración
@@
@.@. Puntos de !eriicación
@
?. Pro'rama de uestras VII. P"!CE$I&IEN%! $E PA"A$A N!"&A
@B @
-. Preparati!os Preliminares
@
)ección de Reacción @. )e
@
VIII. P"!CE$I&IEN%!S $E E&E"/ENCIA
@=
-. ,n ,ntroducción
@=
@. alla de aire de instrumentos
@>
?. alla de a'ua de enriamiento
@>
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MANUAL DE OPERACIONES OPERACIONES MVC II
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B.INS%"UCCI!NES $E %"A4A1!S directa.
peraciones preliminares para el arran(ue de la unidad de cloración
peraciones preliminares para el arran(ue de los compresores -101-1 # -101-2. rran(ue de los compresores -101-1 # -101-2 -
rran(ue de la unidad cloración directa
-
peración normal de la unidad de cloración directa
-
peración no normal de lo los co compresores -101-1 # -101-2
-
Parada normal de la unidad de cloración directa
-
Parada normal de los compresores -101-1 # -101-2
-
Toma de muestras en el 4rea de cloración directa
-
Desmonta5e distri6uidor de etileno del reactor R-101
-
Preparación para la!ado # entrada del reactor R-101
-
Prue6a de presión # secado del reactor R-101
-
Preparación para el arran(ue del reactor R-101
-
Preparación para la!ado # entrada del D-101
-
Prue6a de presión # secado del D-101
-
Prue6a de presión # secado del D-101
-
Preparación para la!ado # entrada del D-102
-
Prue6a de presión # secado del D-102
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MANUAL DE OPERACIONES OPERACIONES MVC II
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. ANED!S -
Descripción de e(uipo
-
74l!ulas de se'uridad
-
,dentiicación de ries'os por puesto de tra6a5o
-
Especiicaciones t8cnicas
-
PD9)/ P # ,D
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MARCO TEORICO
I. $E5INICI#N $E %E"&IN!S -. Con(umo de Cloro Es la cantidad de cloro consumida en el proceso de cloración+ la cual es suministrada hacia la planta de 7C ,, en orma 'aseosa por la planta de Cloro )oda+ a una presión de :.0-:.; './cm2.
@. Con(umo de Etileno Es la cantidad de Etileno consumida en el proceso de cloración. Es suministrada hacia la planta de 7C ,, en orma 'aseosa 'aseosa por la planta de leinas+ leinas+ a una presión 2 de 1; './cm .
?. -.@ $icloroetano *E$C+ Es el producto (ue se orma de la reacción del Cloro
. Catalizador El catali catalizado zadorr utiliz utilizado ado es clorur cloruro o 8rri 8rrico co "eCl "eCl3$ el cual cual hace hace reacc reaccio ionar nar select selecti!a i!amen mente te el cloro cloro # el etilen etileno o hacia hacia la ormaci ormación ón de EDC= EDC= minimi minimizan zando do reacciones secundarias (ue 'eneran compuestos como> tricloroetano+ cloruro de etilo # tetracloro etano.
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1.- a corriente de ondo del reactor+ la cual es recirculada por medio de la 6om6as P-101 +@ ó ). 2.- El EDC de retorno del tam6or de !aporización D-101. 3.- El EDC de retorno del reher!idor E-30:.
. /a( de Venteo Es la corriente 'aseosa (ue es en!iada hacia el incinerador "unidad A00$. Esta corriente ha sido pre!iamente enriada en el intercam6iador E-10? entre "1; a-2?BC$ con la inalidad de condensar # separar todo el EDC.
=. %iempo de re(idencia Es deinido como el tiempo (ue los compuestos reaccionantes permanecen en el reactor. El tiempo de residencia puede estimarse al di!idir el !olumen del reactor por la tasa de lu5o.
II. %E!"6A $E P"!CES! El proceso de ormación de 1+2 dicloroetano "EDC$ re(uiere como materia prima+ cloro "Cl2$ # Etile Etileno no "C "C2:$+ en ase 'aseosa+ en medio de una circulación circulación de EDC l&(uido+ l&(uido+ utilizando utilizando cloruro cloruro 8rrico 8rrico "eCl3$ como catalizador se'n la si'uiente ecuación>
eCl3
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"2$
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Propa'ación
Cl3 eCl"-$ Cl"$ C2 F "3$
VIGENCIA VIGENCIA
C2
C2ClC2 "$ eCl:"-$
Terminación
C2ClC2"$ eCl:"-$
C2ClC2Cl eCl3
El cloruro 8rrico se asocia con una mol8cula de cloro ormando una mol8cula polarizada "1$+ la parte positi!a de esta mol8cula se adiciona al do6le enlace del Etileno ormando el car6anión de cloruro de etilo "2$. Este a su !ez se com6ina con el anión de tetracloruro 8rrico para producir EDC # re'enerar el catalizador "3$. a e%periencia ha demostrado (ue son pe(ueGas las cantidades de catalizador necesarias para alcanzar alta selecti!idad del Etileno hacia el EDC. El proceso de cloración directa a alta temperatura re(uiere de una concentración apro%imadamente de 1000 ppm de catalizador en la primera ase de reacción. )imu )imult lt4n 4nea eame ment ntee con la adic adició ión n de cata catali liza zado dorr+ el proc proces eso o re(u re(uie iere re el suministro de cloruro de sodio "aCl$ en una proporción e(uimolar con el catalizador aGadido. El cloruro de sodio es aGadido en orma de micro sal. El cloruro de sodio reacciona con el cloruro 8rrico se'n la si'uiente ecuación> aCl eCl3
aeCl:
eCl:"-1$ a"$
a disociación del producto ormado 'enera el anión de tetracloruro 8rrico+ el cual como se di5o pre!iamente induce la ormación de EDC en el mecanismo de reacción+ e!itando la reacción secundaria del ión car6anión.
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-. AI&EN%ACI#N AI&EN%ACI#N a unidad de cloración directa de la planta de monocloruro de !inilo 7C ,,+ tiene una capacidad de producción de :?0 toneladas por d&a "TD$+ e(ui!alentes a 1?0 mil toneladas m8tricas anuales de 1+2 dicloroetano "EDC$. a alimentación se compone de las si'uientes corrientes>
C!""IEN%E
%$&
P"!CE$ENCIA
Cloro
32A
Planta Cloro )oda
Etileno
12;
Planta leinas
@. "EACCI#N El proceso de cloración es del tipo alta temperatura+ sistema CER "recuperación de la ener'&a de cloración$+ consistiendo de los si'uientes sistemas # reactores> Reactor R-101 CER. )istema de recirculación del reactor. )istema de e!aporación instant4nea. )istema de !enteo del reactor. Reactor R-1 R-102 de la la se' se'unda eta etapa con con con cone%iones de !e !enteo # sistema de circulación.
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,,,. $ESC"IPCI#N $E P"!CES! El cloro es suministrado desde la planta Cloro )oda entre :-:.; '/cm 2'+ este 'as alimenta tanto al reactor R-101+ como al reactor R-102. El etileno es reci6ido desde la planta de leinas a 1; '/cm2'+ siendo reducida su presión mediante el controlador de presión P,C-1102+ hasta la presión normal de alimentación A+2-A+; '/cm2'. El cloro # etileno se in#ectan a la recirculación de EDC del reactor R-101 mediante la 6o(uilla de mezcla -101. os lu5os de cloro # etileno son re'ulados mediante el controlador de cloro C-1103 # el de etileno C-1101. El sistema posee un controlador de lu5o ino de etileno+ C-1102 el cual a5usta autom4ticame autom4ticamente nte el lu5o de etileno al reactor reactor R-101 de acuerdo con el resultado del analizador de etileno en el !enteo del reactor+ ,C-1202. ,C-1202. a recirculación de EDC est4 conormada por tres corrientes> 1.- a recirculación del reactor R-101 por intermedio de las 6om6as P-101 /@/). 2.- El EDC de retorno del tam6or de !aporización D-101+ por intermedio de las 6om6as P-102 /). 3.- El EDC de retorno del reher!idor E-30:.
El reactor R-101 opera a una temperatura de 11? a 120BC # presión de 2+?-
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el lu5o de EDC producto+ disminu#e el ni!el del tam6or de !aporización D-101 lo cual permite ma#or salida de EDC del reactor R-101. El EDC producido en el reactor R-101 se en!&a hacia el tam6or de !aporización D-101+ donde de6ido a la disminución de presión # a la alta temperatura+ el EDC se !aporiza parcialmente. El EDC 'aseoso se en!&a hacia la columna C-302+ el EDC l&(uido es recirculado hacia el reactor R-101 por medio de las 6om6as P-102 /)+ # una pe(ueGa racción se en!&a hacia el reactor R-102 con la inalidad de mantener la concentración de catalizador en este ltimo. El tam6or de !aporización D-101 opera a una presión de 0+?-0+J '/cm2' # HABC. El EDC (ue lu#e hacia el reher!idor E-30: de la columna de pesados C-302+ es en!iado por las 6om6as P-101 /@/). El EDC de estas 6om6as es di!idido en dos lu5os. El primero !a hacia el reher!idor E-30: a5ust4ndose el lu5o mediante el controlador ,C-110J. El se'undo pasa a tra!8s del enriador E-102 # es en!iado como recirculación al reactor R-101= esta corriente permite el control de temperatura del reactor mediante el T,C-1101+ al !ariar el lu5o de des!&o al enriador E-102 de acuerdo con la seGal de temperatura del reactor. os 'ases de !enteo del reactor R-101 reci6en una dilución de nitró'eno con la
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os 'ases de !enteo del reactor secundario pasan a tra!8s del condensador de !enteo E-10: "temp.salida F :0BC$ donde se condensa parte del EDC el cual es retornado al reactor secundario por 'ra!edad. os !apores (ue salen del E-10: se en!&an hacia el enriador E-10? "temp.salida F 1; a-2?BC$ donde se condensa todo el EDC+ retorn4ndose al reactor R-102. a corriente de incondensa6les+ principalmente por nitró'eno+ o%&'eno # etileno+ se en!&a hacia el incinerador.
IV. IV. VA"IA4 VA"IA4ES ES $E $ E P"!CES! as !aria6les m4s rele!antes del proceso son las si'uientes> 1.- Composición de Etileno El etileno es suministrado por la Planta de leinas. a especiicación del etileno es la si'uiente>
Etileno
HH.H?I 7ol.
&nimo
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Cloraci! Direc"a Direc"a
3.- Relación de alimentación etileno/cloro os lu5os de etileno # cloro de6en i5arse en una relación e(uimolar "un mol cloro por cada mol de etileno$. El cloro es re'ulado por el controlador C-1103+ # el Etileno por el C 1101+ el cual se alimenta al reactor de orma e(uimolar mediante la si'uiente e%presión T Cl2 K 2;/A1 F T C2:. Con la inalidad de 'arantizar una completa reacción del cloro alimentado al reactor+ se mantiene un li'ero e%ceso de etileno a5ustado por el lazo de control del ,C-1202+ el cual analiza etileno en el 'as de !enteo del reactor # en!&a una seGal a la !4l!ula de control ino de etileno ,C-1102. :.- Temperatura del Reactor Principal R-101 El react reactor or R-10 R-101 1 es del tipo tipo clor cloraci ación ón a alta alta temp temper erat atur ura+ a+ sist sistem emaa CER CER "recuperaci "recuperación ón de la ener'&a ener'&a de cloración$+ cloración$+ el cual de6e operar entre una temperatura temperatura de 11?-120BC+ 8sta se mantiene constante al eliminarse continuamente el calor de reacción en>
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PAG. PAG.%' de 30 PEQUIVEN PROCESO
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a concentración de catalizador en los reactores de6e ser la si'uiente> -
Reactor Primario "R-101$ 1000 ppm peso Reactor )ecundario "R-102 100 ppm peso
En las la6ores de arran(ue+ se adiciona el cloruro 8rrico # la sal hasta alcanzar la concentración de 1000 ppm de cloruro 8rrico. Este catalizador permanece en el sistema+ # por lo tanto no son necesarias nue!as in#ecciones de catalizador. De6ido a la li'era corrosión en el reactor por la reacción del cloro con el hierro # la corrosión por la presencia de a'ua # Cl+ la concentración de cloruro 8rrico puede incrementarse le!emente. a concentración de cloruro 8rrico en el EDC de reciclo+ no de6e e%ceder de 1?00 ppm. Para controlarla por de6a5o de dicho !alor+ se de6e retirar re'ularmente una pe(ueGa cantidad de EDC hacia la columna de !ac&o+ C-303 "esta pur'a se realiza en la descar'a de la P-102/)$. A.- Producción EDC hacia puriicación El EDC producto "'aseoso$ se 'enera en el tam6or de !aporización D-101 de6ido a la 6rusca disminución de presión entre el reactor primario # el tam6or de
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PAG. PAG.%( de 30 PEQUIVEN PROCESO
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Etileno en
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PAG. PAG.%) de 30 PEQUIVEN PROCESO
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l comp comple leta tarr el seca secado do++ las las cone cone%i %ion ones es de e(ui e(uipo poss ad#a ad#ace cent ntes es de6e de6en n pur'arse completamente con EDC caliente. nte ntess del del arra arran( n(ue ue de los los e(ui e(uipo pos+ s+ de6e de6en n re! re!is isar arse se las las !4l! !4l!ul ulas as en la tu6er&a de a'ua de enriamiento al condensador+ as& como las !4l!ulas de !enteo+ !ac&o # ali!io de presión. Todas odas las 6om6 6om6as as de6e de6en n int inter erca cam6 m6iiars arse con con r recue ecuenc nciia dur duran ante te el el secado para (ue al inalizar el mismo no (uede rastro al'uno de EDC hmedo. De la misma manera+ los des!&os de las !4l!ulas de control de6en limpiarse recuentemente durante el secado. 2.- )ecado de la *nidad
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El primer llenado con EDC seco se realiza desde el tan(ue de EDC crudo seco T-;12. El reactor R-101+ el tam6or de separación D-101 # el reactor R-102 con el e(uipo asociado se llenan con EDC seco pro!eniente del sistema de secado. El !enteo del tope del sistema sistema de reacción est4 parcialmente a6ierto. l llenar el reactor reactor R-102 es necesa necesario rio tener cuidado cuidado con los lechos lechos de empa(u empa(ue+ e+ por esto de6en de6en e!itar e!itarse se !ariaciones demasiado r4pidas en el ni!el de l&(uido "menos de ?I por minuto$. a l&nea de 'as de desecho hacia la unidad A00 de incineración se 6lo(uea con disco cie'o.
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Para una operación li6re de pro6lemas de corrosión+ se de6e secar este sistema cuidadosamente. 1. El rea reactor R-101 se llena con EDC seco desde el sistema DN "cone%ión en el tope del reactor$ hasta un J0I ":0 T apro%.$= cuando el ni!el en el reactor alcanza ?0I+ se arranca la 6om6a de circulación P101/@/) # se a5usta el lu5o de circulación a una razón apro%imada de J00 m3/hr. /hr. a circulación circulación ocurre a tra!8s tra!8s del enriador enriador E-102. a !4l!ula !4l!ula al rehe reher! r!id idor or E-30 E-30:+ :+ de la colu column mnaa de pesa pesado doss C-302 C-302 se encue encuent ntra ra an an cerrada.
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H. Por medio de control manual+ se introduce etileno # cloro lentamente en el reactor R-101 a tra!8s de la 6o(uilla de mezcla -101 del reactor. reactor. a reacción molar etileno/cloro de6e ser de 1>1. 10. Cuando se esta6ilice una car'a apro%imada de ?0I # se ha alimentado cloro al reactor R-102+ en relación con el etileno indicado por el controlador *C-1301+ el e%ceso de etileno en el 'as de !enteo del reactor R-10 R-102 2 se opti optimi miza za++ para para (ue (ue am6a am6ass corr corrie ient ntes es de 'as 'as dese desech chos os se encuentren li6res de cloro.
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13. 13. El lu5 lu5o o de !apo !apore ress de EDC EDC haci haciaa la *nid *nidad ad de puri purii ica caci ción ón "col "colum umna na C-302 C-302$$ comi comienz enzaa cuan cuando do los los par4 par4me metr tros os de reacc reacció ión n se encuentran dentro del ran'o re(uerido para iniciar producción> -
Temper emperat atur uraa 11? 11?-1 -120B 20BC. C. Presió Presión n en el tam6o tam6orr de separ separaci ación ón D-101 D-101 "0.? "0.?2 2 '/cm '/cm2'$ i!el i!el de am6o am6oss reacto reactores res R-10 R-101 1 # R-102 R-102 "30-A "30-A0I$ 0I$.. Cantid Cantidad ad de clor cloro o li6re> li6re> 0 en el EDC de de recicl reciclo o
1:. Para Para la la esta6 esta6il iliz izaci ación ón de la la presi presión ón # la tem temper perat atur uraa de la reac reacci ción ón++ el enriador de recirculación E-102 del reactor R-101 CER de6e estar en
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Para e!itar pro6lemas pro6lemas de operación+ operación+ tales como ormación ormación de espuma+ espuma+ se de6e realiz realizar ar mu# lentam lentament entee una reducc reducción ión en la presi presión ón de operac operación ión mediant mediantee el
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a temperatura temperatura en el reactor reactor R-101 se a5usta+ a5usta+ mediante mediante el controlador controlador T,C-1101+ a 11?-120BC. a misma se mantiene constante al eliminar el calor de
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Presión del reactor R 102
0 ?A '/cm2'
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no *C FBCl+
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De6en De6en cerra cerrarse rse las !4l!ula !4l!ulass manual manuales es rele rele!ant !antes. es.
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