GB199354A - Improvements in or relating to processes for the manufacture of diphenyl guanidine - Google Patents
Improvements in or relating to processes for the manufacture of diphenyl guanidineInfo
- Publication number
- GB199354A GB199354A GB9369/23A GB936923A GB199354A GB 199354 A GB199354 A GB 199354A GB 9369/23 A GB9369/23 A GB 9369/23A GB 936923 A GB936923 A GB 936923A GB 199354 A GB199354 A GB 199354A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diphenylguanidine
- zinc oxide
- zinc
- acid
- oxide
- 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
- C07C277/00—Preparation of guanidine or its derivatives, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups
- C07C277/08—Preparation of guanidine or its derivatives, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups of substituted guanidines
Abstract
Diphenylguanidine is prepared by treating diphenylthiourea suspended in a solution of ammonia and water with a metallic compound, such as zinc oxide, lead oxide or lead carbonate, capable of eliminating the sulphur from the thiourea. According to the example, symdiphenylthiourea is heated with zinc oxide and strong aqueous ammonia, each in excess, to a temperature not exceeding 80 DEG C. The resulting mixture of diphenylguanidine, zinc sulphide and zinc oxide may, after filtration and drying, be used directly as a vulcanization accelerator; or the diphenylguanidine may be separated by boiling the mixture with hydrochloric or other acid, neutralizing the excess of acid with sodium acetate or similar salt, introducing hydrogen sulphide to precipitate the zinc, filtering, and finally liberating the diphenylguanidine from its salt by means of alkali. If lead oxide be used instead of zinc oxide, the reaction product is digested with sulphuric acid and the diphenylguanidine sulphate solution filtered off. The Specification as open to inspection under Sect. 91 (3) (a) states also that disubstituted guanidines are obtained by treating symmetrically disubstituted thiourea in the manner above. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US199354XA | 1922-06-19 | 1922-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB199354A true GB199354A (en) | 1924-07-07 |
Family
ID=21795851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9369/23A Expired GB199354A (en) | 1922-06-19 | 1923-04-05 | Improvements in or relating to processes for the manufacture of diphenyl guanidine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB199354A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2545933A (en) * | 1948-05-26 | 1951-03-20 | Allied Chem & Dye Corp | Conversion of iron oxide into iron with coke-oven gas |
| CN108727228A (en) * | 2017-10-23 | 2018-11-02 | 科迈化工股份有限公司 | A kind of vulcanization accelerator diphenylguanidine（DPG）Continuous production processes |
-
1923
- 1923-04-05 GB GB9369/23A patent/GB199354A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2545933A (en) * | 1948-05-26 | 1951-03-20 | Allied Chem & Dye Corp | Conversion of iron oxide into iron with coke-oven gas |
| CN108727228A (en) * | 2017-10-23 | 2018-11-02 | 科迈化工股份有限公司 | A kind of vulcanization accelerator diphenylguanidine（DPG）Continuous production processes |
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