US4547612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lubricant and/or heavy distillate range hydrocarbons by light olefin upgrading
Assignee: Mobil Oil AS
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Filing: 1984-09-25
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Granted: 1985-10-15
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Expires: 2004-09-25
Abstract
Abstract In a continuous process for upgrading lower olefin feedstock to higher hydrocarbons including the steps of combining olefinic feedstock with a pressurized liquid diluent stream comprising C5+ olefins, contacting the diluted feedstock with a shape selective medium pore acid zeolite catalyst under reaction conditions at elevated temperature in a pressurized reactor zone to convert olefins and recover reactor effluent at reaction conditions; an improvement has been found which comprises: heating and separating reactor effluent in a primary phase separation zone to vaporize light and middle distillate hydrocarbon components into a first vapor phase stream and recover a heavy liquid stream from the primary separation zone, said heavy liquid stream containing at least 50% of those C20+ hydrocarbons recovered in the reactor effluent; condensing a portion of the first vapor phase stream by cooling and recovering the dominant portion of a liquid olefinic recycle stream for combining with the feedstock, said recycle stream comprising a major portion of C6 to C18 hydrocarbons recovered in the reactor effluent; and further fractionating the heavy liquid stream from the primary separation zone to obtain a major lubricant product stream consisting essentially of substantially linear C20+ aliphatic hydrocarbons.
Inventors
- 👤 Samuel A. Tabak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:16
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/12; C10; C10G; C10G50/00; C10G50/02; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
A continuous process for producing heavy hydrocarbons comprising lubricant or heavy distillate range compounds having a substantially linear molecular conformation from lower olefins, comprising: contacting olefinic feedstock under oligomerization conditions at moderate reaction temperature and high pressure favorable to formation of high molecular weight aliphatic hydrocarbons with a shape selective medium pore acidic crystalline sillicate zeolite catalyst in a reaction zone maintained under low severity conditions to prevent excessive cracking; recovering oligomerized hydrocarbon effluent containing high boiling hydrocarbon product and lower boiling olefinic components; separating the high boiling product by partially fractionating the effluent in a continuous product fractionator including the step of heating a high boiling product liquid fraction at temperature substantially higher than the reaction temperature, thereby providing a vapor fraction rich in lower boiling olefinic components; recycling a stream comprising at least a portion of the lower boiling fraction for further reaction in the reaction zone; said fraction containing the major portion of C 6 to C 18 hydrocarbon components; recovering a high boiling product stream comprising at least 90 weight percent hydrocarbons boiling above 290° C.
Claim 2
Dependent Claim
180 words
A continuous process for producing heavy hydrocarbons comprising lubricant or heavy distillate range compounds having a substantially linear molecular conformation from lower olefins, comprising: contacting olefinic feedstock under oligomerization conditions at moderate reaction temperature and high pressure favorable to formation of high molecular weight aliphatic hydrocarbons with a shape selective medium pore acidic crystalline sillicate zeolite catalyst in a reaction zone maintained under low severity conditions to prevent excessive cracking; recovering oligomerized hydrocarbon effluent containing high boiling hydrocarbon product and lower boiling olefinic components; separating the high boiling product by partially fractionating the effluent in a continuous product fractionator including the step of heating a high boiling product liquid fraction at temperature substantially higher than the reaction temperature, thereby providing a vapor fraction rich in lower boiling olefinic components; recycling a stream comprising at least a portion of the lower boiling fraction for further reaction in the reaction zone; said fraction containing the major portion of C 6 to C 18 hydrocarbon components; recovering a high boiling product stream comprising at least 90 weight percent hydrocarbons boiling above 290° C.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the catalyst comprises HZSM-5 and the oligomerization effluent is recovered at a temperature below about 290° C.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the oligomerization is conducted at a pressure of at least 1000 kPa.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the major portion of C 20 + hydrocarbon components are contained in the high boiling liquid fraction.
Claim 6
Dependent Claim
55 words
The process of claim 1 wherein the feedstock and recycle streams are combined under process pressure, heated to reaction temperature and passed through a multi-zone reactor system comprising a series of operatively connected fixed bed adiabatic catalytic reactors, with inter-reactor cooling to maintain the average reaction temperature in the reactor beds below about 260° C.
Claim 7
Dependent Claim
35 words
The process of claim 5 wherein the weight hourly space velocity is about 0.1 to 1, based on fresh feedstock olefins, and wherein the feedstock olefins consist essentially of C 3 to C 6 mono-olefins.
Claim 8
Dependent Claim
198 words
In the continuous process for upgrading lower olefin feedstock to higher hydrocarbons including the steps of combining olefinic feedstock with a pressurized liquid diluent stream comprising C 5 + olefins, contacting the diluted feedstock with a shape selective medium pore acid zeolite catalyst under reaction conditions at elevated temperature in a pressurized reactor zone to convert olefins and recover reactor effluent at reaction conditions; the improvement which comprises: heating and separating reactor effluent in a primary phase separation zone to vaporize light and middle distillate hydrocarbon components into a first vapor phase stream and recover a heavy liquid stream from the primary separation zone, said heavy liquid stream containing at least 50% of those C 20 + hydrocarbons recovered in the reactor effluent; condensing a portion of the first vapor phase stream by cooling and recovering the dominant portion of a liquid olefinic recycle stream for combining with the feedstock, said recycle stream comprising a major portion of C 6 to C 18 hydrocarbons recovered in the reactor effluent; and further fractionating the heavy liquid stream from the primary separation zone to obtain a major lubricant product stream consisting essentially of substantially linear C 20 + aliphatic hydrocarbons.
Claim 9
Dependent Claim
198 words
In the continuous process for upgrading lower olefin feedstock to higher hydrocarbons including the steps of combining olefinic feedstock with a pressurized liquid diluent stream comprising C 5 + olefins, contacting the diluted feedstock with a shape selective medium pore acid zeolite catalyst under reaction conditions at elevated temperature in a pressurized reactor zone to convert olefins and recover reactor effluent at reaction conditions; the improvement which comprises: heating and separating reactor effluent in a primary phase separation zone to vaporize light and middle distillate hydrocarbon components into a first vapor phase stream and recover a heavy liquid stream from the primary separation zone, said heavy liquid stream containing at least 50% of those C 20 + hydrocarbons recovered in the reactor effluent; condensing a portion of the first vapor phase stream by cooling and recovering the dominant portion of a liquid olefinic recycle stream for combining with the feedstock, said recycle stream comprising a major portion of C 6 to C 18 hydrocarbons recovered in the reactor effluent; and further fractionating the heavy liquid stream from the primary separation zone to obtain a major lubricant product stream consisting essentially of substantially linear C 20 + aliphatic hydrocarbons.
Claim 10
Dependent Claim
34 words
The process of claim 7 wherein the catalyst comprises a silicate zeolite having a silica to alumina mole ratio of at least 12 to 1 and a constraint index of about 1 to 12.
Claim 11
Dependent Claim
35 words
The process of claim 8 wherein the catalyst comprises HZSM5, the feedstock olefin comprises a major amount of propylene and the lubricant product consists essentially of hydrocarbons having one methyl substituent per 4-5 carbon atoms.
Claim 12
Dependent Claim
97 words
The process of claim 7 wherein feedstock comprising a major amount of C 3 -C 6 is combined with the olefinic recycle stream in a ratio of at least about 0.5 moles of recycle per mole of feedstock olefin and contacted with a fixed bed of acid aluminosilicate zeolite catalyst having a constraint index of about 1 to 12 at a reaction temperature of about 200° C. to 290° C. at process pressure of about 4000 to 21,000 kPa and at a weight hourly space velocity less than 1 to convert a major amount of feedstock olefin.
Claim 13
Dependent Claim
15 words
A process of claim 7 further comprising the step of hydrotreating said lubricant product stream.
Claim 14
Dependent Claim
38 words
The process of claim 7 wherein the effluent is heated under process pressure between the reactor zone and the primary separation zone to a temperature at least 30° C. higher than the effluent temperature leaving the reactor zone.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |