JPS57171953A - Improved method for condensing n-phenylcarbamic acid ester - Google Patents
Improved method for condensing n-phenylcarbamic acid esterInfo
- Publication number
- JPS57171953A JPS57171953A JP56056771A JP5677181A JPS57171953A JP S57171953 A JPS57171953 A JP S57171953A JP 56056771 A JP56056771 A JP 56056771A JP 5677181 A JP5677181 A JP 5677181A JP S57171953 A JPS57171953 A JP S57171953A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- carboxylic acid
- acid ester
- methylene
- phenylcarbamic
- 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
- -1 n-phenylcarbamic acid ester Chemical class 0.000 title abstract 3
- 239000003054 catalyst Substances 0.000 abstract 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 abstract 3
- 239000011347 resin Substances 0.000 abstract 3
- 229920005989 resin Polymers 0.000 abstract 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract 2
- 125000000217 alkyl group Chemical group 0.000 abstract 2
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 abstract 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000003377 acid catalyst Substances 0.000 abstract 1
- 125000002843 carboxylic acid group Chemical group 0.000 abstract 1
- 239000012295 chemical reaction liquid Substances 0.000 abstract 1
- 150000002148 esters Chemical class 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000000178 monomer Substances 0.000 abstract 1
- 239000002243 precursor Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
PURPOSE: To obtain the bis-condensate of the titled ester useful as a precursor of pure MDI, etc., in high selectivity, by reacting N-phenylcarbamic acid ester with a methylene-introducing agent using a fluorinated carboxylic acid resin as a catalyst.
CONSTITUTION: Methylene-bis-(4-phenylcarbamic acid ester) is prepared by reacting an N-phenylcarbamic acid ester of formulaI(R is alkyl, etc.; R' is H, alkyl, etc.; r is integer of 0W4) with a methylene-introducing agent (e.g. HCHO) at 10W 200°C under normal pressure or positive pressure, using a catalyst comprising a fluorinated carboxylic acid resin containing at least one kind of monomer unit having the carboxylic acid group such as the group of formula II.
EFFECT: Since the fluorinated carboxylic acid resin catalyst is solid in contrast with a liquid acid catalyst such as hydrochloric acid, there are remarkable industrial merits; i.e. non-corrosiveness to the reaction apparatus, easy separation and recovery of the catalyst from the reaction liquid, easy performance of continuous reaction, free from discharge of waste acid solution, etc.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56056771A JPS57171953A (en) | 1981-04-15 | 1981-04-15 | Improved method for condensing n-phenylcarbamic acid ester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56056771A JPS57171953A (en) | 1981-04-15 | 1981-04-15 | Improved method for condensing n-phenylcarbamic acid ester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57171953A true JPS57171953A (en) | 1982-10-22 |
| JPS6247177B2 JPS6247177B2 (en) | 1987-10-06 |
Family
ID=13036735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56056771A Granted JPS57171953A (en) | 1981-04-15 | 1981-04-15 | Improved method for condensing n-phenylcarbamic acid ester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57171953A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5384424A (en) * | 1991-06-26 | 1995-01-24 | Lucky Limited | Process for the selective preparation of 4,4-methylene-bis-(N-phenylalkylcarbamate) |
-
1981
- 1981-04-15 JP JP56056771A patent/JPS57171953A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5384424A (en) * | 1991-06-26 | 1995-01-24 | Lucky Limited | Process for the selective preparation of 4,4-methylene-bis-(N-phenylalkylcarbamate) |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6247177B2 (en) | 1987-10-06 |
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