Process for preparing ethyl lactate by catalytic esterification of fixed bed reactor

Abstract

The invention relates to a process for preparing ethyl lactate by catalytic esterification of a fixed bed reactor. The process comprises the following steps: step A, inputting a mixed material of lactic acid and ethanol into the fixed bed reactor from a feed port of the fixed bed reactor; step B, the materials entering the fixed bed reactor are inputted into a tube nest of the fixed bed reactor through a material distribution disc of the fixed bed reactor; step c, the materials react in the tube nests; and step D, discharging the reacted materials from the tube nest, collecting the materials at the bottom of the fixed bed reactor, and discharging the materials from the discharge port of the fixed bed reactor. According to the invention, the supporting assembly is arranged, the supporting assembly is composed of a plurality of connecting assemblies, so that the tube nest can be conveniently fixed and supported, the width of the clamping plate can be set as required, and the contact areabetween the clamping plate and the tube nest is larger, so that when the tube nest vibrates, the tube nest can be effectively prevented from being abraded, material fatigue and the like; therefore, the probability of leakage of the tube nest is reduced.

Description

technical field [0001] The invention relates to the technical field of fixed bed reactors. Specifically, it utilizes a fixed-bed reactor to catalyze esterification to prepare ethyl lactate. Background technique [0002] In the process of catalytic esterification to prepare ethyl lactate, a fixed-bed reactor is required. The traditional fixed-bed reactor adopts the feeding method of bottom-in and top-out, which has problems such as bias flow and material back-mixing. It is used in a fixed-bed reactor. At the same time, the tubes will vibrate due to various factors, and the tube sheet used to support and fix the middle of the tube has a small contact area with the tube. After the tube vibrates for a long time, the contact between the tube and the tube sheet will Material fatigue, cracks will cause wear and tear of the tubes, resulting in leakage, and the traditional tube sheet is an integral plate structure, which will affect the flow of heat exchange liquid in the shell side...

AI Technical Summary

Problems solved by technology

[0002] In the process of catalytic esterification to prepare ethyl lactate, a fixed-bed reactor is required. The traditional fixed-bed reactor adopts the feeding method of bottom-in and top-out, which has problems such as bias flow and material back-mixing. It is used in a fixed-bed reactor. At the same time, the tubes will vibrate due to various factors, and the tube sheet used to support and fix the middle of the tube has a small contact area with the tube. After the tube vibrates for a long time, the contact between the tube and the tube sheet will Material fatigue, cracks will cause wear and tear of the tubes, resulting in leakage, and the traditional tube sheet is an integral plate structure, which will affect the flow of heat exchange liquid in the shell side, and the thermal conductivity of the existing fixed bed reactor is relatively low. The heat transfer efficiency is further affected, and there is a large temperature difference between the inside and outside of the tube sheet, resulting in a large temperature difference stress; the bottom of the existing tubes is inconvenient when supporting the catalyst, and there are certain troubles in disassembly and installation.

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