Methylamines Production - 15,000 metric tons/year
Methylamines are produced from the reactions of methanol with an excess of ammonia in the vapor phase over a fixed bed of silica alumina catalyst.
Liquefied anhydrous ammonia and methanol are mixed with recycle amines and the combined feed is vaporized at (280 psig) 19.7 KG/CM2G in a succession of heat exchangers using waste heat streams. The feed vapor is further heated to about 370°C using heat interchange with the reaction product and is then passed through a reactor containing 5 fixed beds of a silica alumina catalyst. The reaction is exothermic and the product vapor leaves the reactor at 430°C as a mixture of the three methylamines MMA, DMA & TMA together with excessammonia. The reaction product vapor is used to pre-heat and partially vaporize the feed and is itself cooled to just below the dew point at about 145°C.
The reaction product is then passed to a series of distillation columns for separation of the three methylamines.
The ammonia column removes all of the excess ammonia together with some MMA and TMA as an overhead produce which is recycled to the recycle feed tank.
The TMA column removes the T'MA as an overhead produce by extractive distillation, using extract water as a supplementary feed to the top section of the column. TMA is drawn off to run down tanks and any product which is surplus to sales requirements is passed to the column recycle tank for recycle to reaction.
The dehydration column removes the remaining MMA and DMA as an overhead product from the extract water which is filtered and cooled using the vaporizing reaction product. The extract water is recycled to the TMA column and that which is surplus to requirements is discharged to drain via a tundish.
The DAM column makes the final separation between pure MMA and DMA which are drawn off to respective run down tanks. MMA surplus to sales requirements is recycled to the column recycle tank.
The distillation columns operate at successively lower pressures so that product flows from the reactor to the DMA column without the need for further pumping.
Gaseous vents and purges are piped to the vent absorber which absorbs amines and ammonia using water. Final vent gases are discharged to atmosphere. Amine solution from the vent absorber and the drains tank is passed to the stripper from which recovered amines are recycled to the recycle feed tank.
The three methylamine products are passed to final storage tanks as liquefied anhydrous products for filling into (cylinders? and) pressurized road tankers. A proportion of each product is also made up into agreed solutions for filling to drums and road tankers.
SOLUTION CHANGER AQUEOUS T.M.A COOLERS OF AQUEOUS M.M.A. COOLERS OF AQUEOUS M.M.A. COOLERS OF AQUEOUS D.M.A. INITIAL VAPORIZERFEED VAPORIZER AND BACKGROUND COOLER E-103N .LOAD AUXILIARY VAPORIZERFINAL CARPENT VAPORIZER.CHANGER POWER OUTPUT D-101.CHANGER POWER OUTPUT D-101.CHANGER POWER OUTPUT D-101.ELECTRIC HEATER LOAD D-101.ELECTRIC HEATER LOAD D-101.ELECTRIC HEATER LOAD D-101.COLUMN IRON E-101.CONDENSER COLUMN E-101.NH3 COOLER.TUMBLE COLUMN HOLDERTMA COLUMN CONDENSER.TMA COOLER PRODUCT.DEHYDRATION COLUMN BOILER.COLUMN CONDENSER E-103N.E-104 COLUMN HOLDER.DMA COLUMN CONDENSER.COOLING MACHINE PRODUCT.COOLER D.M.A PRODUCT.RECYCLE INTERMEDIATE TANK COOLER.COOLER FUND E-107 (STRIPPER).FUND COOLER E-107. (STRIPPER).CHANGEER POWER SUPPLY E- 107.CHANGEER POWER SUPPLY E- 107.CHANGEER POWER SUPPLY E-107.CHANGEER POWER SUPPLY E-107.CONDENSER OF E-107.COOLER STRIPPER HEAD.DMA COOLER PRODUCT.VAP. AMMONIA RECYCLE/COND. E-103.COND. E-102 VAP. FUNDS E-104.
REACTOR OF AMINES
AMMONIA COLUMN T.M.A. COLUMNDEHYDRATION COLUMND.M.A. COLUMNVENT GASES ABSORBORSTRIPPER.
MEOH FEED TANK.NH3 POWER TANK.FINAL TANK OF ANHYDROUS M.M.A. FINAL TANK OF ANHYDROUS D.M.A. FINAL TANK OF M.M.A.FINAL TANK OF AQUEOUS D.M.A. FEED TANK ACME TO DMAc.FINAL TANK OF DMAc.FINAL TANK OF DMF.TANK FOOD MEONa AND DMAX.FINAL TANK AQUEOUS M.M.A.FINAL TANK AQUEOUS D.M.A. 40%.AMMONIA STORAGE.REC. RESIN ELIM. Acetaldehydes AcMe.RECEPTOR HEAD COLUMN REC. MeOH.RECYCLE POWER TANK.INTERMEDIATE TANK OF T.M.A.INTERMEDIATE TANK OF T.M.A.INTERMEDIATE TANK OF M.M.A.INTERMEDIATE TANK OF M.M.A.INTERMEDIATE TANK OF D.M.A.INTERMEDIATE TANK OF D.M.A.INTERMEDIATE RECYCLING TANK.CONDENSED EXPANSION CONTAINER.SEPARATOR OF VAPORIZORS.CONDENSED CONTAINER C-105.CONDENSED CONTAINER C-118.DRAIN UNDERGROUND TANK.
FILTER ENTRY NH3 A F-002.
PUMP DISCHARGE TANKS MeOH A F-001.DMA POWER PUMP DMF / DMAc.PUMP TRANSFER ANHYDROUS MMA F-003.PUMP TRANSFER ANHYDROUS DMA F-004.TRANSFER PUMP ANHYDROUS TMA F-005.TRANSFER PUMP AQUEOUS DMA F-007.TRANSFER PUMP AQUEOUS TMA F-008.DISCHARGE PUMP FMe F-010.NH3 TRASBASE PUMPNH3 PUMP DOWNLOADMETHANOL PUMP F-070.AQUATIC MMA PUMP.AQUA DMA PUMP.POWER PUMP NH3 TO UNIT.POWER PUMP NH3 TO UNIT.MEOH POWER PUMP TO UNIT.MEOH POWER PUMP TO UNIT.RECYCLE POWER PUMP.RECYCLE POWER PUMP.TRANSFER PUMP T.M.A. PRODUCT.PUMP TRANSFER M.M.A. PRODUCT.PUMP TRANSFER D.M.A. PRODUCT.TRANS PUMP. RECYCLE F-105 TO F-101.TRANS PUMP. RECYCLE F-105 TO F-101.POWER SUPPLY PUMP FROM E-106 TO E-107.FEED PUMP CONDENSED FROM F-107 TO UNIT.FEED PUMP CONDENSED FROM F-107 TO UNIT.FEED PUMP CONDENSED F-110 A F-107.FEED PUMP CONDENSED F-109 A F-107.BOTTOMS PUMP COLUMN E-103NBOTTOMS PUMP COLUMN E-103NFEED PUMP DRAININGS TO E- 106.EJECTOR ZONE REACTION AND DEST. AMINESRECYCLE AMMONIUM PUMP.BOTTOMS PUMP E-104.
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