US4118588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of methacrylic acid and methyl methacrylate
Assignee: BASF SE
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Filing: 1977-03-25
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Granted: 1978-10-03
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Expires: 1997-03-25
Abstract
Abstract Methacrylic acid and methyl methacrylate are manufactured by reacting, respectively, propionic acid and methyl propionate with dimethoxymethane in the presence of catalysts based on phosphates and/or silicates of magnesium, calcium, aluminum, zirconium, thorium and/or titanium, and in the presence of from 0 to 0.5 mole of water per mole of the acetal.
Inventors
- 👤 Gerd Fouquet
- 👤 Franz Merger
- 👤 Rolf Platz
- 👤 Karl Baer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:52
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/353
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
106 words
A process for the manufacture of methacrylic compounds of the formula ##STR5## where R 1 is a substituent chosen from H and CH 3 which comprises reacting a carboxyl compound of the formula ##STR6## where R 1 has the above meaning, with dimethoxymethane of the formula ##STR7## in the presence of catalysts containing one or more salts selected from the group consisting of phosphates and silicates of magnesium, calcium, aluminum, zirconium, thorium and titanium, the reaction time being from 0.1 to 100 seconds and the reaction being carried out in the presence of from 0 to 0.5 mole of water per mole of starting material III.
Claim 2
Dependent Claim
106 words
A process for the manufacture of methacrylic compounds of the formula ##STR5## where R 1 is a substituent chosen from H and CH 3 which comprises reacting a carboxyl compound of the formula ##STR6## where R 1 has the above meaning, with dimethoxymethane of the formula ##STR7## in the presence of catalysts containing one or more salts selected from the group consisting of phosphates and silicates of magnesium, calcium, aluminum, zirconium, thorium and titanium, the reaction time being from 0.1 to 100 seconds and the reaction being carried out in the presence of from 0 to 0.5 mole of water per mole of starting material III.
Claim 3
Dependent Claim
49 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which in addition contain at least one oxygen compound slected from the group consisting of oxides of magnesium, calcium, aluminu, zirconium, thorium and titanium.
Claim 4
Dependent Claim
30 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which additionally contain boric acid.
Claim 5
Dependent Claim
29 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which additionally contain urea.
Claim 6
Dependent Claim
41 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which are modified with salts chosen from carboxylates of the alkali metals and alkaline earth metals.
Claim 7
Dependent Claim
47 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which are modified with compounds chosen from alkali metal compounds and alkaline earth metal compounds which form carboxylates under the reaction conditions.
Claim 8
Dependent Claim
32 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which are modified with alkali metal propionates.
Claim 9
Dependent Claim
37 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts which are modified with hydroxides chosen from postassium hydroxide and lithium hydroxide.
Claim 10
Dependent Claim
54 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts chosen rom phosphates of aluminum, zirconium, thorium and titanium, modified with carboxylates of alkali metals and alkaline earth metals, the carboxyate groupseach being of 3 or 4 carbon atoms.
Claim 11
Dependent Claim
34 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts based in aluminum phosphates modified with alkali metal propionates.
Claim 12
Dependent Claim
39 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the presence of catalysts based on aluminum phosphates modified with hydroxides chosen from lithium hydroxide and potassium hydroxide.
Claim 13
Dependent Claim
25 words
A process for the manufacture of methacrylic compounds as set forth in claim 1, wherein the reaction is carried out in the absence of water.
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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |