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1. (WO2019009792) PROCÉDÉ DE FONCTIONNEMENT D'UN RÉACTEUR VERTICAL CONTINU COMPRENANT UNE ZONE DE PRÉ-HYDROLYSE ET LA CONCEPTION DU RÉACTEUR EN TANT QUE TELLE
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CLAIMS

A method for inhibiting build-up of deposits of sticky reaction products on the interior reactor surfaces in an acidic prehydrolysis zone of a continuous vertical reactor vessel wherein lignocellulosic material is fed continuously to the top of said reactor and said lignocellulosic material being subjected to a prehydrolysis in at least a part of the continuous vertical reactor and at least prehydrolyzed lignocellulosic material is fed out from the bottom of said continuous vertical reactor, characterized in thai a layer (Lay) of anti-fouling liquid is established at the interior wall of the continuous vertical reactor in a position corresponding to at least 30 % of the lower final part of the total vertical length of the prehydrolysis zone (Hyd), and wherein said layer of anti-fouling liquid is maintained at the wall of the reactor until the lower end of the prehydrolysis zone.

The method according to claim 1, characterized in that the layer of anti-fouling liquid is established at the wall of the continuous vertical reactor in a position corresponding to at least 50 % of the lower final part of the total vertical length of the prehydrolysis zone (Hyd).

The method according to claim 2, characterized in that the layer of anti-fouling liquid is established at the wall of the continuous vertical reactor in a position corresponding to below 10 % of the upper first part of the total vertical length of the prehydrolysis zone.

The method according to claim 3, characterized in that the position corresponding to below 10 % of the upper first part of the total vertical length of the prehydrolysis zone lies at least 5 meters below the upper level (CLEV) of lignocellulosic material established in the continuous vertical reactor.

The method according to claim 4, characterized in that the position corresponding to below 10 % of the upper first part of the total vertical length of the prehydrolysis zone lies at least 5 meters below the upper level (LLEV) of hydrolysis liquid established in the continuous vertical reactor.

6. The method according to claim 1, characterized in that the pH of an alkaline liquid when establishing the anti-fouling liquid layer lies in the range 8-14, preferably in a pH range of 9-10.

7. A continuous vertical reactor wherein lignocellulosic material is fed continuously to an inlet in the top of said reactor and at least hydrolyzed lignocellulosic material is fed out from an outlet in the bottom of said continuous vertical reactor, said reactor comprising an acidic prehydrolysis zone (Hyd) in at least the upper part of the reactor, characterized in that a layer (Lay) of anti-fouling liquid is established by injecting alkaline liquid from an alkali liquid source through distribution nozzles (NZ) arranged around the circumference of the interior wall of the continuous vertical reactor in a position corresponding to at least 30 % of the lower final part of the total vertical length of the prehydrolysis zone (Hyd).

8. The continuous vertical reactor according to claim 7, characterized in that the distribution nozzles (NZ) are arranged around the circumference of the interior wall of the continuous vertical reactor in a position corresponding to at least 50 % of the lower final part of the total vertical length of the prehydrolysis zone (Hyd).

9. The continuous vertical reactor according to claim 8, characterized in that the distribution nozzles are arranged around the circumference of the interior wail of the continuous vertical reactor behind a vertical guide plate (GP) that directs the flow of anti-fouling liquid downwards and in parallel with the interior wall of the continuous vertical reactor.

10. The continuous vertical reactor according to claim 7, characterized in that at least one additional layer of alkaline liquid is established by injecting alkaline liquid from an alkali liquid source through a second set of distribution nozzles arranged around the circumference of the interior wall of the continuous vertical reactor in a position located at a distance from the first established layer of alkaline liquid at least 10 % of the total vertical length of the prehydrolysis zone.

11. The continuous vertical reactor according to claim 7, characterized in that no extraction screens (SC) are located in the wall of the prehydrolysis zone between the positions for injection of anti-fouling liquid and the end of the prehydrolysis zone.