US4546206A
Expired / Lapsed
US
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Process for producing methyl tert. alkyl ether
Assignee: Sasol Germany GmbH
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Filing: 1984-06-14
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Granted: 1985-10-08
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Expires: 2004-06-14
Abstract
Abstract Methyl t-butyl ether and methyl t-amyl ether are produced by reacting methanol with isobutene and isoamylene, respectively, at a total methanol/isoolefine mole ratio of 1-1.2:1 in a series of reaction stages such that in the first reaction stage, the total amount of olefin component is reacted with as much methanol as is required to ensure that the methanol/isoolefine mole ratio in the first reaction stage does not drop to less than 0.65:1, and that the methanol concentration in the effluent stream does not exceed 0.4% wt. The residual amount of methanol is then fed either all at once to another reaction stage, or in portions to several additional reaction stages.
Inventors
- 👤 Wilhelm Neier
- 👤 Werner Webers
- 👤 Michael Dettmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/05; C07C41/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
145 words
The process for producing methyl t-alkyl ether selected from the group consisting of methyl t-butyl ether and methyl t-amyl ether by the reaction of isobutene and isoamylene, respectively, with methanol in the presence of acidic solid catalyst in several reaction stages which comprises passing to the first reaction stage the total amount of isoolefine charge and a first portion of the methanol charge; controlling the rate of feed of the first portion of methanol to the first reaction stage whereby the concentration of methanol in the effluent therefrom does not exceed 0.4 w% and the mole ratio of methanol to isoolefine admitted to said first reaction stage does not fall below 0.65:1; adding the residual portion of methanol to the effluent from the first reaction stage in at least an additional reaction stage; and maintaining the total mole ratio of methanol to isoolefine at 1-1.2:1.
Claim 2
Dependent Claim
145 words
The process for producing methyl t-alkyl ether selected from the group consisting of methyl t-butyl ether and methyl t-amyl ether by the reaction of isobutene and isoamylene, respectively, with methanol in the presence of acidic solid catalyst in several reaction stages which comprises passing to the first reaction stage the total amount of isoolefine charge and a first portion of the methanol charge; controlling the rate of feed of the first portion of methanol to the first reaction stage whereby the concentration of methanol in the effluent therefrom does not exceed 0.4 w% and the mole ratio of methanol to isoolefine admitted to said first reaction stage does not fall below 0.65:1; adding the residual portion of methanol to the effluent from the first reaction stage in at least an additional reaction stage; and maintaining the total mole ratio of methanol to isoolefine at 1-1.2:1.
Claim 3
Dependent Claim
53 words
The process for producing methyl t-alkyl ether selected from the group consisting of methyl t-butyl ether and methyl t-amyl ether as claimed 1 wherein the mole ratio of methanol to isoolefine in the charge to the first reaction stage is controlled to yield effluent therefrom containing not more than about 0.1 w% methanol.
Claim 4
Dependent Claim
40 words
The process for producing methyl t-alkyl ether selected from the group consisting of methyl t-butyl ether and methyl t-amyl ether as claimed in claim 1 wherein the mole ratio of methanol to isoolefine in the first reaction stage is 0.65-0.9:1.
Claim 5
Dependent Claim
40 words
The process for producing methyl t-alkyl ether selected from the group consisting of methyl t-butyl ether and methyl t-amyl ether as claimed in claim 1 wherein the mole ratio of methanol to isoolefine in the first reaction stage is 0.70-0.85:1.
Claim 6
Dependent Claim
25 words
The process for producing methyl t-butyl ether as claimed in claim 1 wherein the isobutene charge is present in an isobutene-containing C 4 hydrocarbon stream.
Claim 7
Dependent Claim
25 words
The process for producing methyl t-amyl ether as claimed in claim 1 wherein the isoamylene charge is present in an isoamylene-containing C 5 hydrocarbon stream.
Claim 8
Dependent Claim
157 words
The process for producing methyl t-butyl ether by the reaction of isobutene, in a charge C 4 hydrocarbon stream, with charge methanol in the presence of acidic solid catalyst in several reaction stages which comprises passing to the first reaction stage the total amount of isobutene charge and a portion of the methanol charge; controlling the rate of feed of methanol to the first reaction stage whereby the concentration of methanol in the effluent therefrom does not exceed 0.4% and the mole ratio of methanol to isoolefine admitted to said first reaction stage does not fall below 0.65:1; adding the residual portion of methanol to the effluent from the first reaction stage in at least one additional reaction stage; and maintaining the total mole ratio of methanol to isobutene at 1-1.2:1; thereby producing product stream containing product methyl t-butyl ether and unreacted isobutene; and recycling a recycle portion of said product stream to said first reaction stage.
Claim 9
Dependent Claim
157 words
The process for producing methyl t-butyl ether by the reaction of isobutene, in a charge C 4 hydrocarbon stream, with charge methanol in the presence of acidic solid catalyst in several reaction stages which comprises passing to the first reaction stage the total amount of isobutene charge and a portion of the methanol charge; controlling the rate of feed of methanol to the first reaction stage whereby the concentration of methanol in the effluent therefrom does not exceed 0.4% and the mole ratio of methanol to isoolefine admitted to said first reaction stage does not fall below 0.65:1; adding the residual portion of methanol to the effluent from the first reaction stage in at least one additional reaction stage; and maintaining the total mole ratio of methanol to isobutene at 1-1.2:1; thereby producing product stream containing product methyl t-butyl ether and unreacted isobutene; and recycling a recycle portion of said product stream to said first reaction stage.
Claim 10
Dependent Claim
38 words
The process for producing methyl t-butyl ether as claimed in claim 7 wherein the ratio of (i) said recycle portion of said product stream to (ii) said charge hydrocarbon stream plus charge methanol is greater than about 2.
Claim 11
Dependent Claim
69 words
The process for producing methyl t-butyl ether as claimed in claim 7 wherein said reaction is carried out in at least two reaction stages in addition to the first reaction stage and there is admitted to the second reaction stage a second portion of methanol the amount of which is controlled to yield a methanol content in the effluent from the second stage of less than about 0.4 w%.
Claim 12
Dependent Claim
69 words
The process for producing methyl t-butyl ether as claimed in claim 7 wherein said reaction is carried out in at least two reaction stages in addition to the first reaction stage and there is admitted to the second reaction stage a second portion of methanol the amount of which is controlled to yield a methanol content in the effluent from the second stage of less than about 0.1 w%.
Claim 13
Dependent Claim
45 words
The process for producing methyl t-butyl ether as claimed in claim 7 wherein a portion of the product stream from each reaction stage is recycled to said reaction stage and the charge methanol is admitted to each reaction stage with the recycle to that stage.
Claim 14
Dependent Claim
25 words
The process for producing methyl t-butyl ether as claimed in claim 7 wherein said reaction is carried out at 35° C.-70° C. and 5-50 bar.
Claim 15
Dependent Claim
157 words
The process for producing methyl t-amyl ether by the reaction of isoamylene, in a charge C 5 hydrocarbon stream, with charge methanol in the presence of acidic solid catalyst in several reaction stages which comprises passing to the first reaction stage the total amount of isoamylene charge and a portion of the methanol charge; controlling the rate of feed of methanol to the first reaction stage whereby the concentration of methanol in the effluent therefrom does not exceed 0.4% and the mole ratio of methanol to isoolefine admitted to said first reaction stage does not fall below 0.65:1; adding the residual portion of methanol to the effluent from the first reaction stage in at least one additional reaction stage; and maintaining the total mole ratio of methanol to isoamylene at 1-1.2:1; thereby producing product stream containing product methyl t-amyl ether and unreacted isoamylene; and recycling a recycle portion of said product stream to said first reaction stage.
Claim 16
Dependent Claim
157 words
The process for producing methyl t-amyl ether by the reaction of isoamylene, in a charge C 5 hydrocarbon stream, with charge methanol in the presence of acidic solid catalyst in several reaction stages which comprises passing to the first reaction stage the total amount of isoamylene charge and a portion of the methanol charge; controlling the rate of feed of methanol to the first reaction stage whereby the concentration of methanol in the effluent therefrom does not exceed 0.4% and the mole ratio of methanol to isoolefine admitted to said first reaction stage does not fall below 0.65:1; adding the residual portion of methanol to the effluent from the first reaction stage in at least one additional reaction stage; and maintaining the total mole ratio of methanol to isoamylene at 1-1.2:1; thereby producing product stream containing product methyl t-amyl ether and unreacted isoamylene; and recycling a recycle portion of said product stream to said first reaction stage.
Claim 17
Dependent Claim
38 words
The process for producing methyl t-amyl ether as claimed in claim 13 wherein the ratio of (i) said recycle portion of said product stream to (ii) said charge hydrocarbon stream plus charge methanol is greater than about 2.
Claim 18
Dependent Claim
69 words
The process for producing methyl t-amyl ether as claimed in claim 13 wherein said reaction is carried out in at least two reaction stages in addition to the first reaction stage and there is admitted to the second reaction stage a second portion of methanol the amount of which is controlled to yield a methanol content in the effluent from the second stage of less than about 0.4 w%.
Claim 19
Dependent Claim
69 words
The process for producing methyl t-amyl ether as claimed in claim 13 wherein said reaction is carried out in at least two reaction stages in addition to the first reaction stage and there is admitted to the second reaction stage a second portion of methanol the amount of which is controlled to yield a methanol content in the effluent from the second stage of less than about 0.1 w%.
Claim 20
Dependent Claim
45 words
The process for producing methyl t-amyl ether as claimed in claim 13 wherein a portion of the product stream from each reaction stage is recycled to said reaction stage and the charge methanol is admitted to each reaction stage with the recycle to that stage.
Claim 21
Dependent Claim
25 words
The process for producing methyl t-amyl ether as claimed in claim 13 wherein said reaction is carried out at 35° C.-70° C. and 5-50 bar.
References Cited (Backward Citations)
US4262146A
Cited
US4320233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |