Lamp for photochemical reactor with light-emitting diodes
A lamp for a photochemical reactor, including: a support member made of a material having a thermal conductivity greater than or equal to 100W/mK at 20° C. and including at least one channel configured to contain a coolant fluid; at least one printed circuit mounted on the support member; and at least one light-emitting diode mounted on the printed circuit. A photochemical reactor including such a lamp, and a method for preparing a cycloalkanone oxime or a lactam using such a lamp.
1. A lamp for a photochemical reactor comprising:
a support made of a material having thermal conductivity that is greater than or equal to 100 W/m·K at 20° C. and comprising at least one channel configured to contain a coolant fluid;
at least one printed circuit board mounted on said support; and
at least one light-emitting diode mounted on said printed circuit board.
2. The lamp as claimed in claim 1 , wherein the material of the support is selected from the group consisting of copper, silver, gold, aluminum, silicon carbide, graphite, aluminum-silicon carbide alloys, zinc, and combinations thereof.
3. The lamp as claimed in claim 1 , wherein the material of the support has thermal conductivity that is greater than or equal to 300 W/m·K at 20° C.
4. The lamp as claimed in claim 1 , further comprising a bulb containing the support, the at least one printed circuit board and the at least one light-emitting diode.
5. The lamp as claimed in claim 4 , wherein the bulb contains an inert gas, the inert gas being a flow form of inert fluid.
6. The lamp as claimed in claim 1 , wherein the support has a convex polygon-shaped cross-section.
7. The lamp as claimed in claim 6 , wherein the convex polygon has from 5 to 25 sides.
8. The lamp as claimed in claim 1 , wherein the at least one channel comprises the coolant fluid.
9. The lamp as claimed in claim 8 , further comprising a coolant fluid supply line comprising the coolant fluid having a temperature that is less than or equal to 25° C.
10. The lamp as claimed in claim 1 , having luminous efficiency that is greater than or equal to 40%.
11. An immersion photochemical reactor comprising a reaction liquid and at least one lamp as claimed in claim 1 at least partly immersed in said reaction liquid.
12. A method for preparing a cycloalkanone oxime comprising photonitrozation of a cycloalkane using a nitrozating agent and at least one lamp as claimed in claim 1 .
13. A method for preparing a lactam comprising:
preparing a cycloalkanone oxime according to the preparation method of claim 12 ; and
Beckmann transposition of the cycloalkanone oxime.
14. The lamp as claimed in claim 1 , wherein the lamp comprises a coolant fluid supply line is made of copper.
15. The lamp as claimed in claim 1 , wherein the lamp comprises a coolant fluid collection line for recovering a coolant fluid after the coolant fluid has passed through the support, the coolant fluid collection line being made of copper.
16. The lamp as claimed in claim 1 , wherein the at least one channel configured to contain the coolant fluid is perforated.
17. The lamp as claimed in claim 1 , wherein the at least one printed circuit board is a metal core printed circuit board containing a dielectric layer between the at least one light-emitting diode mounted on the at least one printed circuit board and a metal base of the at least one printed circuit board; or is a metal core printed circuit board with direct thermal path technology that does not include a dielectric layer between the at least one light-emitting diode mounted on the at least one printed circuit board and a metal base of the at least one printed circuit board.
18. The lamp as claimed in claim 1 , wherein the at least one light-emitting diode is directly mounted onto a surface of the at least one printed circuit board.
19. The lamp as claimed in claim 1 , wherein the support comprises from 2 to 40 channels configured to contain the coolant fluid.