Preparation of Ethyl Lactate by Catalyzed Esterification in Fixed Bed Reactor

Abstract

The present invention utilizes the fixed-bed reactor to catalyze the esterification to prepare the ethyl lactate process, and comprises the following steps: Step A: inputting the mixed material of lactic acid and ethanol into the fixed-bed reactor from the feed port of the fixed-bed reactor; Step B: The materials entering the fixed bed reactor are input into the tubes of the fixed bed reactor through the distribution tray of the fixed bed reactor; Step C: The materials are reacted in the tubes; Step D: The reacted materials are discharged from the tubes Afterwards, it is collected at the bottom of the fixed-bed reactor and discharged from the outlet of the fixed-bed reactor. In the present invention, by arranging the support assembly, the support assembly is composed of a plurality of connection assemblies, which can facilitate the fixing and support of the tube, and because the width of the splint can be set as required, there is a greater contact with the tube. Therefore, when the tube is vibrated, the wear of the tube and the fatigue of the material can be effectively avoided, thereby reducing the probability of leakage of the tube.

Description

Technical field [0001] The present invention relates to the technical field of fixed bed reactors. Specifically, the process of preparing ethyl lactate by catalytic esterification using a fixed-bed reactor is used. Background [0002] In the catalytic esterification preparation of ethyl lactate process, the need to use a fixed bed reactor, the traditional fixed bed reactor using the feeding method of going in and out, there are problems such as bias flow, material back mixing, etc., when the fixed bed reactor is used, the tube will vibrate due to various factors, and the tube plate used to support and fix the middle of the tube Due to the small contact area with the tube, the tube is in a long-term vibration, resulting in material fatigue at the contact between the tube and the tube, resulting in cracks causing the tube to wear, resulting in leakage, And the traditional tube plate is an integral plate-like structure, which will affect the flow of heat transfer liquid in the shel...

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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