GB613109A - Improvements in or relating to a process of manufacturing mono-chloropyrazine - Google Patents
Improvements in or relating to a process of manufacturing mono-chloropyrazineInfo
- Publication number
- GB613109A GB613109A GB7989/45A GB798945A GB613109A GB 613109 A GB613109 A GB 613109A GB 7989/45 A GB7989/45 A GB 7989/45A GB 798945 A GB798945 A GB 798945A GB 613109 A GB613109 A GB 613109A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pyrazine
- chlorine
- preheated
- nitrogen
- chloropyrazine
- 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
- C07D—HETEROCYCLIC COMPOUNDS
- C07D241/00—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings
- C07D241/02—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings
- C07D241/10—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D241/14—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D241/16—Halogen atoms; Nitro radicals
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
Abstract
Mono-chloropyrazine is obtained by admixing chlorine and pyrazine at 150-600 DEG C. to effect a spontaneous reaction optionally in the presence of an inert diluent such as nitrogen, argon, helium or neon. The reaction is non-catalytic at 450-600 DEG C. and catalytic at 150-450 DEG C. Catalysts instanced are activated carbon, quartz chips, refractory aluminium oxide or diatomaceous earth impregnated with cupric chloride solution. An excess of either reactant may be used and they may be preheated with or without the diluent. In examples, mono-chloropyrazine is obtained by (1) vaporizing pyrazine at 250-330 DEG C. in a nitrogen stream, mixing with chlorine preheated to 150-250 DEG C. and passing over activated carbon at 250-288 DEG C. for a contact time of 5 secs., (2) vaporizing pyrazine at 220 DEG C. in a nitrogen stream, mixing with chlorine and nitrogen preheated to 240 DEG C. and passing over diatomaceous earth impregnated with cupric chloride solution at 390-430 DEG C. for a contact time of 2-5 secs., and (3) vaporizing pyrazine at 280 DEG C. in a nitrogen stream, mixing with chlorine and nitrogen preheated to 295 DEG C. and heating at 510-585 DEG C. with a contact time of 0.2 secs.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US613109XA | 1943-08-25 | 1943-08-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB613109A true GB613109A (en) | 1948-11-23 |
Family
ID=22034967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7989/45A Expired GB613109A (en) | 1943-08-25 | 1945-03-29 | Improvements in or relating to a process of manufacturing mono-chloropyrazine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB613109A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0182111A1 (en) * | 1984-10-20 | 1986-05-28 | BASF Aktiengesellschaft | Process for the preparation of perhalogenated compounds |
-
1945
- 1945-03-29 GB GB7989/45A patent/GB613109A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0182111A1 (en) * | 1984-10-20 | 1986-05-28 | BASF Aktiengesellschaft | Process for the preparation of perhalogenated compounds |
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