Process for preparing hexachlorocyclopentadiene
US4255597A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1980 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Apr 18, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is disclosed a process for the production of hexachlorocyclopentadiene comprising the steps of: 1. Reacting liquid cyclopentadiene and chlorine at a temperature of from about 0.degree. to about 100.degree. C. until an average of at least 4 chlorine atoms has been added per mole of cyclopentadiene to form a first-stage product; 2. heating the resultant liquid reaction product of Step 1 in a second stage at a temperature of from about 140.degree. C. to below about 200.degree. C. with chlorine in the presence of from about 0.0001% to about 5.0% (by weight) of an aromatic compound until the reaction products of Step 1 contain an average of about 6 chlorine atoms per molecule, based on cyclopentadiene starting material; wherein said aromatic compound contains from 1 to 3 aromatic rings; at least one of the rings containing a nitrogen atom; 3. vaporizing and heating the resulting reaction products of Step 2 in a third stage in the presence of chlorine to a temperature of above 450.degree. C. until at least a major portion of said products are converted to hexachlorocyclopentadiene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.