PHTHALIC ANHYDRIDE (1)

PHTHALIC ANHYDRIDEPRESENTED BY:

RODINSON R. ARRIETA PÉREZJESSICA E. BARRIOS BUSTILLOALEXANDER E. ELLES MONTEROCESAR A. GARCÍA ECHEVERRYADRIAN F. GUERRA BENEDETTIMARIA M. GUERRA NUÑEZ

Ftalic anhidride is produced by oxidation reaction between O-xylene and air. Reaction ocurrs in a PBR reactor, where it´s used V2O5

like catalyst. The operation conditions inside reactor for pressure and temperature are 3 atm and 300°C, respectively.

To achieve this conditions inside reactor, is necessary blend between o-xylene and air get pressure and pre-heat before input to reactor. Next, it´s shown the reactions involve in production process of ftalic anhydride:

PROCESS DESCRIPTION

PROCESS DESCRIPTION

CONTROL SPECIFICATIONS

A loop control is necessary to keep the temperature at 146ºC in the outlet flow of leaving of the first heat exchanger. If the temperature is lower than 144 oC, a visible alarm is generated, the o-xileno pump is shutdown

1)

TT-O1

PID

FCV-01

Stop

PIPE AND INSTRUMENTATION DIAGRAM


2)

If the temperature of o-xileno in the outlet of second heat exchanger is higher than 305 oC, the steam valve is closed. If the temperature is lower than 295 oC, the steam valve is open to allow the temperature rise



3)

The concentration of o-xylene in the mixer must remain at 33% mol. If the concentration is over 33,5% mol, a visible alarm is generated and the valve o-xylene should be locked

SL-

02



4)

The pressure exerted by o-xileno in the reactor must be monitored. Is necessary to keep the pressure at 3 atm. If the pressure in the reactor is above this value, a relief valve opens to decrease



5)

The reactor outlet temperature must be maintained between 390 º C and 400 º C. If the temperature is higher than 400 º C, Hitec valve is opened. If the temperature is below 390 º C the valve should be closed Hitec



6)

In the distillation column is required distillate concentration is between 95% and 99% of phthalic anhydride. If the concentration is below 95%, it generates a visible alarm, opening a recirculation valve and valve blocks the distillate



7)

The production of ftalic anhydride should be monitored for knowing the total discharge monthly.

FT-

01



8)

Maleic anhydride is a pollutant to the environment thus it is necessary to monitor and register the concentration. A visible alarm is generated if maleic anhydride concentration is higher than 10 ppm

AT-03



9)

The distillation tower needs a continuous stream flow feeding with phthalic anhydride and maleic anhydride, for this there are two pumps in parallel, the first is always ON, and the second is ON when the first pump fails

Start Output

Stop MOTOR Interlock

Status FB

Auto FB Fail PUMP 02

FAIL

1

PU-02STA

PU-02AU

PU-02S/S

Start Output

Stop MOTOR Interlock

Status FB

Auto FB Fail

PU-03STA

PU-03AU

PU-03S/S

PUMP 02 FAIL


INPUT AND OUTPUT LISTINPUT LIST

• Temperature Transmitter

01


02


03

• Analite Transmitter 01



• Flow Transmitter 01

• Pressure Transmitter 01

OUTPUT LIST

•Strobe Light 01

•Strobe Light 02

•Strobe Light 03

•Strobe Light 04

•Flow Control Valve 01








•Pu-01 S/S

•Pu-02 S/S•Pu-03 S/S

INPUT AND OUTPUT LIST

TOTAL ANALOG INPUT CARDS REQUIRES

•Temperature Transmitter 01



•Analite Transmitter 01



•Flow Transmitter 01

•Pressure Transmitter 01

It´s necessary one analog input card of 8 instruments for 8 instruments.

TOTAL DISCRETE INPUT CARDS REQUIRES

No exist

INPUT AND OUTPUT LIST

TOTAL ANALOG OUTPUT CARDS REQUIRES



It´s necessary one analog output card of 8 instruments for 2 instruments.

TOTAL DISCRETE OUTPUT CARDS REQUIRES

•Strobe Light 01

•Strobe Light 02

•Strobe Light 03

•Strobe Light 04







•Pu-01 S/S

•Pu-02 S/S•Pu-03 S/S

It´s necessary two discrete output card of 8 instruments for 13 instruments

Documents

PHTHALIC ANHYDRIDE (1)