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US 5,347,064 AGranted
Multiple split feed isoparaffin-olefin alkylation
AssigneeMobil Oil Corporation
InventorsJonathan E. Child, Kenneth J. Del Rossi, Albin Huss, Jr., Robert S. Kurtas
Life of this patent
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Abstract
An isoparaffin-olefin alkylation process is disclosed which improves alkylate quality by segregating the olefin feed into intermediate feedstreams which are enriched in propene, 1-butene, and/or 2-butenes with respect to the olefin feed, and alkylating these intermediate feedstreams in separate reaction zones at reaction temperatures specific to the olefin feed to increase the ratio of trimethylpentanes to dimethylhexanes in the resulting alkylate product.
Claims19
An isoparaffin-olefin alkylation process comprising the steps of:
- (a) providing a feed comprising propene, 1-butene, and 2-butenes;
- (b) separating a first intermediate stream from said feed, said first intermediate stream being enriched in propene in comparison to said feed;
- (c) separating a second intermediate stream from said feed, said second intermediate stream being enriched in 1-butene in comparison to said feed;
- (d) separating a third intermediate stream from said feed, said third intermediate stream being enriched in 2-butenes in comparison to said feed;
- (e) contacting said first intermediate stream with excess isobutane in a first reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under isobutane-propene alkylation conversion conditions including temperature T.sub.1 to produce a first alkylate product enriched in isoparaffins having more than 4 carbon atoms;
- (f) contacting said second intermediate stream with excess isobutane in a second reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under isobutane-1-butene alkylation conversion conditions including temperature T.sub.2, wherein T.sub.2 <T.sub.1, to produce a second alkylate product enriched in isoparaffins having more than 5 carbon atoms;
- (g) contacting said third intermediate stream with excess isobutane in a third reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under isobutene-2-butenes alkylation conversion conditions including temperature T.sub.3, wherein T.sub.3 <T.sub.2 <T.sub.1, to produce a third alkylate product enriched in isoparaffins having more than 5 carbon atoms;
- and
- (h) recovering said alkylate products from steps (e), (f), and (g).
6 more elements
An isoparaffin-olefin alkylation process comprising the steps of:
- (a) providing a feed comprising propene, 1-butene, 2-butenes, and isobutene;
- (b) separating a first intermediate stream from said feed, said first intermediate stream being enriched in propene in comparison to said feed, to evolve a second propene-lean intermediate stream, said second propene-lean intermediate stream being lean in propene in comparison to said feed;
- (c) contacting said second propene-lean intermediate stream with methanol in a first reaction zone containing an etherification catalyst under conversion conditions to selectively convert isobutene to methyl tertiary butyl ether;
- (d) recovering methyl tertiary butyl ether from said second propene-lean intermediate stream;
- (e) separating a third intermediate stream from said feed, said third intermediate stream being enriched in 1-butene in comparison to said feed;
- (f) separating a fourth intermediate stream, said fourth intermediate stream being enriched in 2-butenes in comparison to said feed;
- (g) contacting said first intermediate stream with excess isobutane in a first reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under isobutane-propene alkylation conversion conditions including temperature T.sub.1 to produce a first alkylate product enriched in isoparaffins having more than 4 carbon atoms;
- (h) contacting said third intermediate stream with excess isobutane in a second reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under isobutane-1-butene alkylation conversion conditions including temperature T.sub.2, wherein T.sub.2 <T.sub.1, to produce a second alkylate product enriched in isoparaffins having more than 5 carbon atoms;
- (i) contacting said fourth intermediate stream with excess isobutane in a third reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under isobutane-2-butenes alkylation conversion conditions including temperature T.sub.3, wherein T.sub.3 <T.sub.2 <T.sub.1, to produce a third alkylate product enriched in isoparaffins having more than 5 carbon atoms;
- and
- (j) recovering said alkylate products from steps (g), (h), and (i).
8 more elements
A process for alkylating an isoparaffin with an olefin comprising the steps of:
- (a) providing a feed comprising propene, 1-butene, and 2-butenes;
- (b) separating a first intermediate stream from said feed, said first intermediate stream being enriched in propene and 1-butene in comparison to said feed;
- (c) separating a second intermediate stream from said feed, said second intermediate stream being enriched in 2-butenes in comparison to said feed;
- (d) contacting said first intermediate stream with excess isobutane in a first reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under a first set of alkylation conversion conditions including temperature T.sub.1 to produce a first alkylate product enriched in isoparaffins having more than 4 carbon atoms;
- (e) contacting said second intermediate stream with excess isobutane in a second reaction zone containing BF.sub.3 and H.sub.3 PO.sub.4 in BF.sub.3 :H.sub.3 PO.sub.4 molar ratios of from about 0.5:1 to about 1.5:1 under a second set of alkylation conversion conditions including temperature T.sub.2, wherein T.sub.2 <T.sub.1, to produce a second alkylate product enriched in isoparaffins having more than 5 carbon atoms;
- and
- (g) recovering said alkylate products from steps (d) and (e).
4 more elements
Dependencies are inferred from the claim text.