GB435721A - Improvements in process for preparing metol - Google Patents
Improvements in process for preparing metolInfo
- Publication number
- GB435721A GB435721A GB31972/34A GB3197234A GB435721A GB 435721 A GB435721 A GB 435721A GB 31972/34 A GB31972/34 A GB 31972/34A GB 3197234 A GB3197234 A GB 3197234A GB 435721 A GB435721 A GB 435721A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydroquinone
- monomethylamine
- monomethyl
- hours
- dissolved
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C215/00—Compounds containing amino and hydroxy groups bound to the same carbon skeleton
- C07C215/74—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton
- C07C215/76—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton of the same non-condensed six-membered aromatic ring
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Monomethyl-p-aminophenol is obtained by the action of monomethylamine at elevated temperature and pressure on hydroquinone in an unsaturated aqueous solution. The hydroquinone may be dissolved in 3--7 times its weight of water. The monomethylamine may be employed as an aqueous solution. A small quantity of alkali sulphite may be present. The sulphate of the monomethyl-p-amino-phenol is obtained by adding sulphuric acid, preferably concentrated, to the above reaction mixture, and separating the product. According to an example, hydroquinone dissolved in five times its weight of water is heated to 190--195 DEG C. in presence of a small quantity of sodium sulphite, in an autoclave, with aqueous methylamine added over a period of 8 hours, after which heating is continued for 8 to 10 hours, followed by neutralizing with sulphuric acid; the heating is carried out preferably in the absence of air. The precipitated metol sulphate crystals are separated. The mother liquor may be utilized by oxidation of the products in it to quinone and subsequent conversion to hydroquinone. U.S.A. Specifications 1,297,685, 1,844,844, 1,844,926, and 1,882,437, and German Specification 260,234 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US435721XA | 1933-11-10 | 1933-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB435721A true GB435721A (en) | 1935-09-26 |
Family
ID=21927835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31972/34A Expired GB435721A (en) | 1933-11-10 | 1934-11-07 | Improvements in process for preparing metol |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB435721A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3155508A (en) * | 1960-06-17 | 1964-11-03 | Walker William | Photographic developers |
| EP0224625A1 (en) * | 1984-06-20 | 1987-06-10 | Mitsui Petrochemical Industries, Ltd. | Process for producing aminophenols |
-
1934
- 1934-11-07 GB GB31972/34A patent/GB435721A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3155508A (en) * | 1960-06-17 | 1964-11-03 | Walker William | Photographic developers |
| EP0224625A1 (en) * | 1984-06-20 | 1987-06-10 | Mitsui Petrochemical Industries, Ltd. | Process for producing aminophenols |
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