JPS54141720A - Preparation of methacrylic acid - Google Patents
Preparation of methacrylic acidInfo
- Publication number
- JPS54141720A JPS54141720A JP4740578A JP4740578A JPS54141720A JP S54141720 A JPS54141720 A JP S54141720A JP 4740578 A JP4740578 A JP 4740578A JP 4740578 A JP4740578 A JP 4740578A JP S54141720 A JPS54141720 A JP S54141720A
- Authority
- JP
- Japan
- Prior art keywords
- methacrylic acid
- methacrolein
- reactor
- stage
- oxidation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To prepare methacrylic acid in high yield, without the steps of the separation, recovery and purification of methacrolein, by oxidizing methacrolein, separating the produced methacrylic acid, re-oxidizing the unreacted raw material, and fractionating the product by multi-stage condensation.
CONSTITUTION: Methacrolein (or a mixture containing the same) prepared in a reactor 2 is subjected to the first sgate oxidation by contacting with molecular oxygen in a reactor 4. The reaction product is sent to a separator 6, and the produced methacrylic acid is separated, e.g. by absorbing in a solvent (first stage separation). The absorbed methacrylic acid is recovered through a pipe 19, and the mixture containing unreacted methacrolein is subjected to the second stage oxidation in a reactor 8. The oxidation product is introduced to a condenser 10, and a part of the methacrylic acid is condensed at e.g. 40W80°C and recovered through a pipe 18. Uncondensed component is sent to a separator 12, where the second stage separation is carried out by, e.g. absorbing in a solvent cooled below room temp.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4740578A JPS54141720A (en) | 1978-04-21 | 1978-04-21 | Preparation of methacrylic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4740578A JPS54141720A (en) | 1978-04-21 | 1978-04-21 | Preparation of methacrylic acid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54141720A true JPS54141720A (en) | 1979-11-05 |
JPS6146461B2 JPS6146461B2 (en) | 1986-10-14 |
Family
ID=12774201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4740578A Granted JPS54141720A (en) | 1978-04-21 | 1978-04-21 | Preparation of methacrylic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54141720A (en) |
-
1978
- 1978-04-21 JP JP4740578A patent/JPS54141720A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6146461B2 (en) | 1986-10-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
SU679132A3 (en) | Method of separating acrylonitrile | |
US4298765A (en) | Purification of phenol with reduced energy consumption | |
KR100492829B1 (en) | Method for purifying acrylic acid and methacrylic acid | |
US4554054A (en) | Methacrylic acid separation | |
GB2103213A (en) | Process for recovering ethylene oxide from aqueous solutions | |
US3870730A (en) | Production of anthraquinone from naphthalene | |
US3404177A (en) | Producing and recovering vinyl acetate from a gaseous mixture by fractional distillation | |
EP0009545B1 (en) | Acrylic acid recovery with recycle quench | |
US4147721A (en) | Process for recovering methacrylic acid | |
JP2002526462A5 (en) | ||
KR101052710B1 (en) | (Meth) acrylic acid purification method obtained by oxidation of base material | |
US3210399A (en) | Method of preparing acrylonitrile free from acetonitrile | |
JPH0629274B2 (en) | Method for separating aldehyde impurities from ethylene oxide | |
JPS54141720A (en) | Preparation of methacrylic acid | |
US4025567A (en) | Purification of fluorinated ethers | |
JPS54141721A (en) | Preparation of methacrylic acid | |
US6476238B1 (en) | Purification method for obtaining high-purity PMDA | |
US3135582A (en) | Production and separation of cyanogen | |
JPS6296447A (en) | Recovery of methacrylic acid | |
US3513632A (en) | Separation of acrylic acid and acrolein | |
JPS62103035A (en) | Separation of methacrolein | |
US4978776A (en) | Process for the manufacture of methyl methacrylate from isobutyric acid | |
JP2004359614A (en) | Method for preparing acrylic acid | |
US3299618A (en) | Process for separating acrylonitrile and acetonitrile | |
JPS6039656B2 (en) | Process for removing non-saponifiable and water-insoluble impurities from mixtures of cyclohexanone and cyclohexanol |