Process for preparing hexachlorocyclopentadiene

Details Process for preparing hexachlorocyclopentadiene Process for preparing hexachlorocyclopentadiene

1980-04-18

1981-03-10

Gantz, Delbert E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570226, 570230, 570231, 570234, 570253, C07C 1702

Patent

active

042555973

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.

REFERENCES:
patent: 2945893 (1960-07-01), Steinhofer et al.
patent: 3073869 (1963-01-01), Hanna et al.
patent: 3624169 (1971-11-01), Fruhwirth et al.

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