▎ 摘　　要

NOVELTY - A reactor internal component for a fixed bed reactor, axially receivable within a portion of an internal reaction cavity of a reactor tube (50), comprises a tubular insert having a tubular wall (12.1) with an outer surface shaped and dimensioned to fit into the internal reaction cavity of the reactor tube, inner passage of varied diameter which is operable to change a profile of the internal reaction cavity, two ends (12.4, 12.5) in which first end is operable to be positioned before a second end, relative to the direction of flow in the fixed bed tubular reactor, such that the flow is from the first end to the second end, and neck portion (16) positioned between the two ends, defined where an inner diameter of the inner passage is the smallest, the neck portion separates the tubular insert into a funnel portion (18) and a functional tube portion (20). USE - A reactor internal component for a fixed bed reactor. ADVANTAGE - The reactor internal component is operable to narrow the passage (internal reaction cavity) in the reactor tube, thus, decreasing heat build-up and resulting in more heat being removed when an exothermic reaction takes place in the reactor. As the internal reaction cavity is operable to receive catalyst particles to provide the catalyst bed, decreasing the internal diameter decreases the amount of catalyst particles receivable in that portion of the reactor tube. The tubular reactor internal component design increases the heat transfer capacity across the tubular reactor wall, facilitates heat removal during highly exothermic reactions and reduces the temperature gradient in the catalyst bed. The design allows for the maintenance of isothermal operation, preventing catalyst deactivation and increasing product selectivity. DETAILED DESCRIPTION - A reactor internal component for a fixed bed reactor, axially receivable within a portion of an internal reaction cavity of a reactor tube (50), comprises a tubular insert having a tubular wall (12.1) with an outer surface shaped and dimensioned to fit into the internal reaction cavity of the reactor tube, inner passage of varied diameter which is operable to change a profile of the internal reaction cavity, two ends (12.4, 12.5) in which first end is operable to be positioned before a second end, relative to the direction of flow in the fixed bed tubular reactor, such that the flow is from the first end to the second end, and neck portion (16) positioned between the two ends, defined where an inner diameter of the inner passage is the smallest, the neck portion separates the tubular insert into a funnel portion (18) and a functional tube portion, the funnel portion is defined by a section of the tubular insert between the first end and the neck portion and the functional tube portion (20) is defined by a section of tubular insert between the neck portion and the second end, at the functional tube portion, the inner passage of the tubular insert gradually increases in diameter in an axial direction, from the neck portion to the second end. INDEPENDENT CLAIMS are included for: (1) modified reactor tube for use in a fixed bed reactor; and (2) method of installing a reactor internal component to improve temperature distribution in a reactor tube of a fixed bed reactor. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the reactor internal component installed in a reactor tube. Tubular wall (12.1) Ends (12.4, 12.5) Neck portion (16) Funnel portion (18) Functional tube portion (20) Reactor tube (50)