Ax and proteins extraction section control system description . 130

• The water feed to W-301, stream 3001, is regulated by a flowrate ratio control, reading the flowrate in the same stream and in streams 2009/2010

• The flowrate out of D-302 is regulated by a weight reading cell

• The flowrate of solvent in stream 3018 is regulated by a throttoling valve, with a flowrate ratio control reading the flowrates in stream 3018 and the signal from the load cell of D-302

• The feed of water to D-305 is regulated on the basis of the level in the same tank

• The velocity of the rotary valve RV-301 is reguated on the basis of the pH in D-305

• A level controller reads the level in D-304 and regulates the solvent feed to the tank, stream 3017

• A level controller reads the level in D-303 and regulates the outlet flowrate, streams 3017

• The flowrate on stream 3028, out of D-306, is regulated reading the flowrate on said stream and operating a throttling valve on the same stream.

• The feed flowrate of citric acid to tank D-307, stream 3029, is regulated on the basis of a flowrate ratio control, reading the flowrated in stream 3028 and 3029

• The flowrate out of D-307, stream 3030, is regulated by a throttling valve based on the level in tank D-307

• The speed of the progressive cavity pump HP-302 is regulated based on the flowrate of its stream

• The flowrate on stream 3032, out of CD-302, is regulated reading the flowrate on said stream and operating a throttling valve on the same stream.

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• The feed flowrate of alkaline solution to tank D-308, stream 3033, is regulated on the basis of a flowrate ratio control, reading the flowrated in stream 3032 and 3033

• The flowrate on stream 3034, out of D-308, is regulated reading the flowrate on said stream and operating a throttling valve on the same stream.

• The feed flowrate of ethanolic solution to tank D-309, stream 3035, is regulated on the basis of a flowrate ratio control, reading the flowrated in stream 3034 and 3035

• The speed of the progressing cavity pump HP-303 is regulated based on the flowrate on stream 3038

• The flowrate on stream 3037, out of CD-303, is regulated reading the flowrate on said stream and operating a throttling valve on the same stream.

• The flowrate of the LPS feed of DD-302, stream 3044, is regulated on the basis of the cylinders’ skin temperature of DD-302

• The flowrate of the LPS feed of DD-301, stream 3052, is regulated on the basis of the cylinders’ skin temperature of DD-301

• The cooling water feed flowrate to HX-301, stream 3054, is regulated on the basis on the temperature of the condensed liquid out of HX-301, stream 3055

1.19.4 Recovery section control system description

• The flowrate out of D-401, stream 4001, is regulated reading the flowrate on said stream and operating a throttling valve on the same stream.

• The LPS feed flowrate to RB-401, stream 4019, is regulated on the basis of the temprature on a pilot tray in CC-401

• The flowrate out of RB-401 is regulated by a throttling valve on the basis of the level reading on the bottom of the column CC-401

• The cooling water feed flowrate to HX-401, stream 4015, is regulated on the basis of the pressure reading on the top oc the column CC-401

• The reflux flowrate to column CC-401, stream 4017, is regulated by a throttling valve on the basis of the flowrate reading in the same stream

• The flowrate of the outlet stream of D-402, stream 4018, is regulated based on the the level reading in D-402

• The flowrate out of the buffer tank D-403, stream 4005, is regulated by a throttling valve on the same stream, on the basis of the level read in d-403

• The speed of the solids’ screw conveyor XF-401, stream 4054, is based on a flowrate reading on the same stream

• The LPS feed flowrate to RB-402, stream 4027, is regulated on the basis of the temprature on a pilot tray in CC-402

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• The flowrate out of RB-402 is regulated by a throttling valve on the basis of the level reading on the bottom of the column CC-402

• The cooling water feed flowrate to HX-402, stream 4023, is regulated on the basis of the pressure reading on the top oc the column CC-402

• The reflux flowrate to column CC-402, stream 4025, is regulated by a throttling valve on the basis of the flowrate reading in the same stream

• The flowrate of the outlet stream of D-403, stream 4026, is regulated based on the the level reading in D-403

• The LPS feed flowrate to the ejector E-201, stream 4029, is regulated on the basis of the pressure in the second stage of the multiple effect

evaporator, EV-402

• The gas flowrate out of EV-401, stream 4032, is regulated basis on the pressure in EV-401

• The liquid flowrate out of EV-401, stream 4010, is regulated by a throttling valve on the basis on the level read in EV-401

• The flowrate of the spilled vapour out of EV-402, stream 4050, is regulated by a flowrate ratio control, reading the flowrates in streams 4050 and 4009 (feed of EV-401)

• The flowrate of the liquid out of EV-402, stream 4011, is regulated by a throttling valve, on the basis of the level read in EV-402

• The speed of the screw-feeder XF-401 is regulated on the basis of the pH in the citric acid tank TK-403

• The flowrate of stream 4052, out of TK-402, is regulated by a throttling valve on the basis of the ethanol fraction in TK-401

• The flowrate of stream 4053 (ethanolic solution used for the precipitation of NaCl), is regulated by a throttling valve on the basis of the flowrate ratio between stream 4053 and 4004

Plot plan