公开(公告)号：US20240424466A1

公开(公告)日：2024-12-26

申请号：US18570667

申请日：2022-05-25

Applicant: BASF SE

Inventor： Ulrich HAMMON ,  Christian RAITH ,  Hans-Juergen BASSLER

IPC: B01J19/00 ,  B01J8/06 ,  B01J19/24 ,  C07C51/25

Abstract: The present invention relates to a process for shutting-down a tubular reactor (1) for a catalytic gas phase reaction from a reaction temperature, wherein the tubular reactor (1) comprises a plurality of vertically arranged reaction tubes (2), an upper tube sheet (5) and a lower tube sheet (6) which each are connected to upper ends and lower ends of the reaction tubes (2) in a gas-tight manner, and a reactor shell (7) which encloses the plurality of reaction tubes (2) forming a liquid-tight heat transfer space (9), wherein, in operation mode, a substantially anhydrous liquefied salt melt (8) is circulated in the heat transfer space (9), characterized in that water (10) is added to the substantially anhydrous liquefied salt melt (8), obtaining a water-salt mixture (11), while cooling the tubular reactor (1) to a temperature below the solidification temperature of the substantially anhydrous liquefied salt melt (8), such that the water-salt mixture (11) is kept in a liquefied state during the whole cooling step of the tubular reactor (1).