METHOD FOR OLEFIN PRODUCTION FROM BUTANES
Systems and processes for producing one or more olefins are provided. In one or more embodiments, a C 4 containing feed can be dehydrogenated to provide a first product containing butene. The first product can be bypassed around an etherification reactor for converting isobutylene to methyl tert-butyl ether. All or any portion of the first product can be cracked to provide a second product containing propylene, ethylene and butane.
1 ) A process for producing one or more olefins, comprising:
dehydrogenating a feed comprising one or more C 4 -containing compounds to provide a first product comprising butene;
bypassing the first product around an etherification reactor for converting isobutylene to methyl tert-butyl ether; and
cracking at least a portion of the first product to provide a second product comprising propylene, ethylene, and butane.
2 ) The process of claim 1 further comprising:
selectively separating at least a portion of the second product to provide a third product comprising propylene and a first recycle comprising butane; and
recycling at least a portion of the first recycle to the first product prior to cracking the first product.
3 ) The process of claim 1 further comprising:
selectively separating at least a portion of the second product to provide a third product comprising propylene and a first recycle comprising butane; and
recycling at least a portion of the first recycle to the feed prior to dehydrogenating the feed.
4 ) The process of claim 1 further comprising:
selectively separating at least a portion of the second product to provide a third product comprising propylene and a first recycle comprising butane;
recycling at least a portion of the first recycle to the first product prior to cracking the first product; and
recycling at least a portion of the first recycle to the feed prior to dehydrogenating the feed.
5 ) The process of claim 1 , wherein the first product is heated to a temperature from 90° C. to 370° C. prior to cracking the first product.
6 ) The process of claim 1 , wherein cracking at least a portion of the first product occurs at a temperature from 590° C. to 675° C.
7 ) The process of claim 1 , wherein cracking at least a portion of the first product occurs at a pressure from 40 kPa to 700 kPa.
8 ) The process of claim 1 , wherein the feed comprises a mixture having of from 40% to 95% by weight paraffinic hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight olefinic hydrocarbons having 4 or more carbon atoms.
9 ) The process of claim 1 , wherein the first product comprises a mixture having of from 40% to 95% by weight olefinic hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight paraffinic hydrocarbons having 4 or more carbon atoms.
10 ) The process of claim 1 , wherein a fluidized catalyst is used to crack all or any portion of the first product to provide the second product.
11 ) The process of claim 10 , wherein cracking the first product utilizes a catalyst to oil ratio of from about 5:1 to about 70:1.
12 ) The process of claim 10 , wherein cracking the first product occurs at a temperature from 550° C. to 650° C. when the first product comprises at least 90% by weight hydrocarbons having 4 carbon atoms.
13 ) A process for retrofitting a methyl tert-butyl ether process, comprising:
bypassing at least a portion of a first product around an existing etherification reactor for converting isobutylene to methyl tert-butyl ether, the first product comprising C 4 hydrocarbons; and
cracking at least a portion of the first product to provide a second product comprising ethylene, propylene, and butane.
14 ) The process of claim 13 , further comprising:
selectively separating at least a portion of the second product to provide a third product comprising propylene and a first recycle comprising butane; and
recycling at least a portion of the first recycle to the first product prior to cracking the first product.
15 ) The process of claim 13 , wherein the first product is heated to a temperature from 90° C. to 370° C. prior to cracking the first product.
16 ) The process of claim 13 , wherein cracking at least a portion of the first product occurs at a temperature from 590° C. to 675° C.
17 ) The process of claim 13 , wherein cracking at least a portion of the first product occurs at a pressure from 40 kPa to 700 kPa.
18 ) The process of claim 13 , wherein the first product comprises a mixture having from 40% to 95% by weight paraffinic hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight olefinic hydrocarbons having 4 or more carbon atoms.
19 ) The process of claim 13 , wherein the second product comprises a mixture having from 40% to 95% by weight olefinic hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight paraffinic hydrocarbons having 4 or more carbon atoms.
20 ) The process of claim 13 , wherein a fluidized catalyst is used to crack all or any portion of the first product to provide the second product.
21 ) The process of claim 20 , wherein cracking the first product utilizes a catalyst to oil ratio of from about 5:1 to about 70:1.
22 ) The process of claim 20 , wherein cracking the first product occurs at a temperature of from about 550° C. to about 650° C. when the first product comprises at least 90% by weight hydrocarbons having 4 carbon atoms.
23 ) A process for making propylene, comprising:
dehydrogenating a feed comprising butane to provide a first product comprising one or more C 4 hydrocarbons;
cracking at least a portion of the first product to provide a second product comprising propylene, ethylene, and butane;
selectively separating at least a portion of the second product to provide a third product comprising propylene and a first recycle comprising butane; and
recycling at least a portion of the first recycle to the feed prior to dehydrogenating the feed; and
recycling at least a portion of the first recycle to the first product prior to cracking the first product.
24 ) The process of claim 23 , wherein cracking at least a portion of the first product comprises contacting the first product with a catalyst consisting essentially of a zeolite.
25 ) The process of claim 23 , wherein the cracking is performed at conditions sufficient to provide a paraffin hydrocarbon conversion per pass of less than 50%.
26 ) The process of claim 23 , wherein the cracking occurs at a pressure from 40 kPa to 700 kPa.
27 ) The process of claim 23 , wherein the cracking occurs at a temperature from 590° C. to 675° C.
28 ) The process of claim 24 , wherein a catalyst to oil ratio is from 5:1 to 70:1.
29 ) The process of claim 23 , wherein the feed comprises a mixture having from 40% to 95% by weight paraffinic hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight olefinic hydrocarbons having 4 or more carbon atoms.
30 ) The process of claim 23 , wherein the first product comprises a mixture having from 40% to 95% by weight olefinic hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight paraffinic hydrocarbons having 4 or more carbon atoms.