Shell side structure and shell and tube vinyl acetate synthesis reactor with same

Abstract

The invention relates to a novel shell side structure for a vinyl acetate synthesis reactor. An upper ring-shaped distributor and a lower ring-shaped distributor are uniformly disposed at upper and lower ends of the shell side structure along peripheral directions respectively, the upper ring-shaped distributor is provided with at least two discharge ports, the lower ring-shaped distributor is provided with at least two inlet ports, at least two discharge ports among the at least two discharge ports are in a flow communicatio with each other through an annular channel arranged in the upper ring-shaped distributor, and at least two inlet ports among the at least two inlet ports are in the flow communication with each other through an annular channel arranged in the lower ring-shaped distributor. A shell and tube vinyl acetate synthesis reactor comprising the novel shell side structure is further related. By means of the shell side structure and the shell and tube vinyl acetate synthesis reactor with the same, uniform flow and uniform heat removing of water and steam which serve as heat removing mediums can be achieved in a shell side, the radial temperature difference of the reactor can be reduced, so that the overall performance of the shell and tube vinyl acetate synthesis reactor can be improved, the synthesis reaction heat can be reasonably utilized, the operation cost is lowered, and the investment and operation costs of devices of a heat-conducting medium circulating pump and the like can be reduced.

Description

technical field [0001] The present invention relates generally to vinyl acetate synthesis reactors. In particular, the present invention relates to a new type of reactor for vinyl acetate synthesis reactor that can realize the uniform distribution and uniform heat removal of water-steam as the heat removal medium and can reduce the radial temperature difference of the vinyl acetate synthesis reactor. A shell-side structure and a shell-and-tube vinyl acetate synthesis reactor including the novel shell-side structure. Background technique [0002] Ethylene oxidation is a process mainly used in the industry for the synthesis of vinyl acetate. Due to the large heat effect of the reaction in the production of vinyl acetate by ethylene oxidation, the tubular fixed-bed reactor is currently an ideal reaction equipment. Since the reaction temperature in the process of producing vinyl acetate by ethylene oxidation is generally controlled at 160°C-220°C, it is generally necessary to ...

AI Technical Summary

Problems solved by technology

The use of heat transfer oil and molten salt as the heat removal medium has the following disadvantages: (1) The heat removal effect of the reactor is poor, and the impurity content of crude vinyl acetate increases; (2) The synthesis reaction heat of vinyl acetate is only used to preheat the circulating gas and not underutilized

The disadvantage of this arrangement in the prior art is that: the heat removal medium is continuously divided or merged when flowing along the main channel in the annular distributor, and the heat removal medium is in a state of variable mass flow, so that the pressure in the annular distributor gradually increases along the flow direction of the fluid. The method of relying on the pressure drop of the fluid through the distribution hole to achieve uniform distribution encounters problems here

However, pressure distribution may vary with operating conditions, and uneven openings may not accommodate pressure changes

Therefore, in order to cope with the variable mass flow in the annular distributor, it is not a good method to open split holes with different diameters

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