Process for the production of vinyl chloride through thermal cracking of 1,2-dichloroethane
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United States of America Patent
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Jan 17, 1989
Grant Date -
N/A
app pub date -
Oct 8, 1987
filing date -
Oct 10, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The hot, vinyl chloride-containing gases leaving the cracking furnace heat liquid 1,2-dichloroethane in a first container to the boiling point or to its immediate vicinity, and the 1,2-dichloroethane is transferred into a second container in which it is partly evaporated under a lower pressure than in the first container. The evaporated 1,2-dichloroethane is fed into the cracking furnace, and the nonevaporated 1,2-dichloroethane is fed back into the first container. By supplying fresh, optionally prewarmed 1,2-dichloroethane into the second container, the amount of product evaporated therein is replaced, the prewarming advantageously being regulated through the level of the liquid 1,2-dichloroethane in the second container. The prewarming of the 1,2-dichloroethane can take place in the convection zone of the cracking furnace or by means of a temperature-control medium, for example steam, which has been heated in the convection zone of the cracking furnace. Compared to processes according to the prior art, higher cracking conversions and a more favorable energy utilization are achieved.
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