Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
192 words
Process of preparing hydrocarbons rich in light monoolefins by: (a) activating a hydrogen-exchanged aluminosilicate catalyst having a silica to alumina ratio of less than 12 by treating with steam at a temperature of at least 400° C.; (b) contacting the steam-activated catalyst in a reaction zone, at a temperature of about 350° to about 600° C., with a gas stream consisting essentially of dimethyl ether or a mixture of methanol and dimethyl ether, as reactant, and sufficient water such that the mole ratio of water to ether in the reaction zone is at least 0.3, at a pressure of about 0.2 to about 30 atmospheres (about 20 to about 3000 kPa), and at a weight hourly space velocity (WHSV) of greater than about 0.5 h -1 , to convert at least 85 wt % of the reactant to hydrocarbons comprising at least 50 wt % ethylene and propylene, said 85% conversion being achieved before the contacting has exceeded 1 g of reactant per g of catalyst, until the catalyst is spent; and (c) regenerating the spent catalyst with a mixture comprising steam and oxygen at a temperature of at least 400° C.
Claim 2
Dependent Claim
192 words
Process of preparing hydrocarbons rich in light monoolefins by: (a) activating a hydrogen-exchanged aluminosilicate catalyst having a silica to alumina ratio of less than 12 by treating with steam at a temperature of at least 400° C.; (b) contacting the steam-activated catalyst in a reaction zone, at a temperature of about 350° to about 600° C., with a gas stream consisting essentially of dimethyl ether or a mixture of methanol and dimethyl ether, as reactant, and sufficient water such that the mole ratio of water to ether in the reaction zone is at least 0.3, at a pressure of about 0.2 to about 30 atmospheres (about 20 to about 3000 kPa), and at a weight hourly space velocity (WHSV) of greater than about 0.5 h -1 , to convert at least 85 wt % of the reactant to hydrocarbons comprising at least 50 wt % ethylene and propylene, said 85% conversion being achieved before the contacting has exceeded 1 g of reactant per g of catalyst, until the catalyst is spent; and (c) regenerating the spent catalyst with a mixture comprising steam and oxygen at a temperature of at least 400° C.
Claim 3
Dependent Claim
23 words
Process of claim 1 wherein the 85% conversion is achieved before the contacting has exceeded 0.3 g of reactant per g of catalyst.
Claim 4
Dependent Claim
23 words
Process of claim 1 wherein the 85% conversion is achieved before the contacting has exceeded 0.1 g of reactant per g of catalyst.
Claim 5
Dependent Claim
15 words
Process of claim 1 wherein steps (b) and (c) are repeated a plurality of times.
Claim 6
Dependent Claim
11 words
Process of claim 2 wherein the catalyst includes added metal cations.
Claim 7
Dependent Claim
11 words
Process of claim 3 wherein the catalyst includes added metal cations.
Claim 8
Dependent Claim
15 words
Process of claim 1 wherein air is used to provide the oxygen in step (c).
Claim 9
Dependent Claim
36 words
Process of claim 1 wherein the conversion of reactant into hydrocarbons is 100% and the hydrocarbons contain at least 75 wt % of the monoolefins ethylene and propylene, of which monoolefins at least 50% is ethylene.
Claim 10
Dependent Claim
54 words
Process of claim 1 wherein the contacting in step (b) is carried out at 450° to 520° C., the catalyst activation and catalyst regeneration temperatures in steps (a) and (c) are 450° to 520° C., the pressure is about atmospheric pressure (about 100 kPa), and the WHSV is 1 to 150 h -1 .
Claim 11
Dependent Claim
11 words
Process of claim 9 wherein the catalyst includes added metal cations.
Claim 12
Dependent Claim
16 words
Process of claim 10 wherein the added metal cation is a cation of barium or strontium.
Claim 13
Dependent Claim
14 words
Process of claim 1 which is carried out in a continuous mode of operation.
Claim 14
Dependent Claim
14 words
Process of claim 1 which is carried out in a semi-continuous mode of operation.
Claim 15
Dependent Claim
11 words
Process of claim 1 wherein the catalyst is a crystalline aluminosilicate.
Claim 16
Dependent Claim
11 words
Process of claim 14 wherein the crystalline aluminosilicate is a zeolite.