Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including external recycle loop
Patent
1988-07-13
1991-04-16
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Including external recycle loop
422187, 422211, 422235, B01J 800
Patent
active
050080881
ABSTRACT:
A process for introducing exothermic reactant vapor stream to an adiabatic catalyst zone comprising the steps of: preheating a volatile liquid exothermic reactant stream below its autogenous temperature under process pressure; contacting the preheated liquid reactant stream in a saturator unit with a hot diluent gas to vaporize the reactant stream in gaseous mixture with the diluent stream; directing the gaseous mixture from the saturator unit to the catalyst zone for exothermic conversion of the reactant under substantially adiabatic reaction conditions in the presence of diluent gas; recovering reaction products and diluent gas from the catalyst zone; separating diluent gas from the products, compressing and recycling the diluent gas to the saturator unit. Methods and apparatus are provided for use in a continuous catalytic MTG process for making gasoline boiling range hydrocarbons exothermically from a methanol-containing reactant stream diluted with a methane-rich recycle gas stream by contacting the diluted feedstock with a fixed bed of crystalline aluminosilicate zeolite catalyst having a silica to alumina ratio of at least 12 and a constraint index of about 1 to 12 in an adiabatic reaction zone at elevated temperature and pressure. The improved MTG system includes contacting compressed recycle gas with preheated liquid feedstock at a temperature substantially below the autogenous temperature of methanol under process conditions to vaporize methanol into the recycle gas stream, thereby providing methanol vapor tot he catalyst bed only in the presence of diluent gas.
The recycle gas may be contacted with the liquid feedstock in a counter-current vertical tower operatively connected through an upper gas outlet to the reaction zone and wherein liquid feedstock flows downwardly under gravity through a saturation zone.
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Sze, M. C., and Campagnolo, J. F., "A Method for Designing the Steam Recovery System in Carbon Monoxide-Steam `Shift` Reaction Units"; Chemical Engineering Progress; Mar. 1956; pp. 121-126.
Chemical Engineer' Handbook, Section 18 "Liquid-Gas Systems".
Fremuth Dietmar R. A.
Rogers Alan E.
Zahner John C.
Griffith Jr. D. John
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Warden Robert J.
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