US4088822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneous production of methacrylic acid and a methacrylate or acrylic acid and an acrylate
Assignee: Nippon Kayaku Co Ltd
•
Filing: 1976-05-21
•
Granted: 1978-05-09
•
Expires: 1996-05-21
Abstract
Abstract Methacrylic acid and its ester or acrylic acid and its ester are prepared at the same time by reacting methacrolein or acrolein with an aliphatic alcohol and molecular oxygen in vapor phase in the presence of a Pd- P-P- O or Pd- P- Sb- O catalyst.
Inventors
- 👤 Masanobu Ogawa
- 👤 Toshitake Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:58
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; C07C67/00; C07C67/39
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
A process for simultaneously producing methacrylic acid and a methacrylate or acrylic acid and an acrylate, which process comprises reacting methacrolein or acrolein with an aliphatic alcohol and molecular oxygen in vapor phase in the presence of a catalyst consisting essentially of (1) palladium, (2) phosphorous and (3) oxygen as essential elements and (4) antimony as an optional element.
Claim 2
Dependent Claim
59 words
A process for simultaneously producing methacrylic acid and a methacrylate or acrylic acid and an acrylate, which process comprises reacting methacrolein or acrolein with an aliphatic alcohol and molecular oxygen in vapor phase in the presence of a catalyst consisting essentially of (1) palladium, (2) phosphorous and (3) oxygen as essential elements and (4) antimony as an optional element.
Claim 3
Dependent Claim
34 words
The process as claimed in claim 1 wherein a phosphoric acid or a phosphorus compound capable of forming a phosphoric acid through chemical change during the reaction is concurrently supplied to the reaction system.
Claim 4
Dependent Claim
74 words
The process as claimed in claim 1 wherein said catalyst is a composition represented by the following formula: Pd.sub.a P.sub.b Sb.sub.c O.sub.d wherein letters a, b, c and d represent numbers of palladium, phosphorus, antimony and oxygen atoms, respectively, when a is 1, b is 1 to 42, c is 0 to 15 and d is a number which is of itself determined by total valences of other elements, generally from 3.5 to 115.
Claim 5
Dependent Claim
27 words
The process as claimed in claim 3 wherein a is 1, b is 1 to 28, c is 0.2 to 10 and d is 3.8 to 85.
Claim 6
Dependent Claim
13 words
The process as claimed in claim 1 wherein said aliphatic alcohol is methanol.
Claim 7
Dependent Claim
14 words
The process as claimed in claim 2 wherein said phosphoric acid is orthophosphoric acid.
Claim 8
Dependent Claim
14 words
The process as claimed in claim 2 wherein said phosphoric acid is pyrophosphoric acid.
Claim 9
Dependent Claim
14 words
The process as claimed in claim 2 wherein said phosphoric acid is metaphosphoric acid.
Claim 10
Dependent Claim
28 words
The process as claimed in claim 2 wherein said phosphorus compound capable of forming a phosphoric acid through chemical change during the reaction is an organic phosphoric acid.
Claim 11
Dependent Claim
28 words
The process as claimed in claim 2 wherein said phosphorus compound capable of forming a phosphoric acid through chemical change during the reaction is a solid phosphoric acid.
Claim 12
Dependent Claim
12 words
The process as claimed in claim 1 wherein a reagent is methacrolein.
Claim 13
Dependent Claim
12 words
The process as claimed in claim 1 wherein a reagent is acrolein.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |