Naphtachimie S.a.

Naphthachimie

Serge Bellet

Andre Martens

Guy Margail

Marc Loublier

Jean-Pierre Toulet

Pierre Crouzet

The present invention relates to a method of manufacturing one or more chemical products in which a chemical reaction is performed by causing one or more reagents to flow along the inside of a tube disposed in a radiation zone of a furnace. In the method, at least a portion of the tube is caused to vibrate so as to limit the deposition of reaction by-products on the inside wall of the tube. More particularly, the tube can be vibrated at a frequency lying in the range 50 Hz to 2000 Hz. The invention also provides apparatus for performing the method of the invention, which apparatus comprises a furnace including a radiation thermal enclosure through which at least one tube passes, which tube is provided with at least one excitation means suitable for generating tube vibration.

Apparatus for manufacturing chemical products

Method of manufacturing chemical products

Apparatus for the cracking of hydrocarbons in the presence of steam for the production of olefins and diolefins which includes a thermal radiation enclosure enclosing at least one cracking tube having an inlet to which the hydrocarbons and steam are supplied and having an outlet for the cracking products. The internal diameter of the tube diminishes continuously or discontinuously from the inlet to the outlet and the ratio between the internal diameters of the tube at the inlet and the outlet is between 1.2 and 3. The ratio of the length of the tube within the enclosure to the mean internal diameter of the tube is between 200 and 600. Heat is supplied to the tube by burners within the enclosure so that the thermal power applied along the length of the tube increases in the direction from the inlet to the outlet and so that the ratio between the thermal power applied to the half of the tube extending from the inlet to the thermal power applied to the remaining half of the tube is between 40/60 and 15/85.

Apparatus for the steam cracking of hydrocarbons for the preparation of

The present invention relates to a process for the preparation of olefins by the cracking of hydrocarbons consisting in passing a mixture of hydrocarbons and steam flowing in a cracking tube disposed inside a radiation zone of a furnace. The process is characterized in that an increase of the cracking temperature of the mixture between the inlet and the outlet of the radiation zone is associated to a non-homogeneous distribution of the thermal power of the furnace, greater at the beginning of the cracking tube than at the end, and to a reaction volume which is greater in the second half of the length tube than in the first one. The present invention relates also to a cracking furnace in which between the inlet and the outlet of the radiation zone the diameter of the cracking tube increases and the thermal power of the burners used to heat the cracking tube decreases. The decreasing thermal power may be applied by arranging burners of different sizes spaced along the cracking tube with the burners of larger size disposed nearer the inlet end of the cracking tube than the burners of smaller size.

Hydrocarbon cracking apparatus

The present invention relates to a process for the preparation of olefins and diolefins by the cracking of hydrocarbons in the presence of steam, consisting in passing a mixture of hydrocarbons and steam flowing in a cracking tube disposed inside a radiation zone of a furnace. The process is characterized in that the mean dwell time of the mixture of flowing in the cracking tube between the inlet and the outlet of the radiation zone is from 300 to 1800 milliseconds, and the reaction volume is greater in the first half of the tube length than in the second one. The present invention relates also to a cracking furnace in which the ratio between the length and the mean diameter of the cracking tube is from 200 to 600, and the tube diameter decreases from the inlet to the outlet of the radiation zone.

Process and furnace for the steam cracking of hydrocarbons for the

The present invention relates to a process for the preparation of olefins by the cracking of hydrocarbons consisting in passing a mixture of hydrocarbons and steam flowing in a cracking tube disposed inside a radiation zone of a furnace. The process is characterized in that an increase of the cracking temperature of the mixture between the inlet and the outlet of the radiation zone is associated to a non-homogeneous distribution of the thermal power of the furnace, greater at the beginning of the cracking tube than at the end, and to a reaction volume which is greater in the second half of the length tube than in the first one. The present invention relates also to a cracking furnace in which between the inlet and the outlet of the radiation zone the diameter of the cracking tube increases and the thermal power of the heating means decreases.

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Chateauneuf Les Martigues, France

Serge Bellet