A Jet-type Gas-Liquid Reactor for Acid Preparation Using Aldehyde Feedstock and Air

Abstract

A jet-type gas-liquid reactor for preparing acid by using aldehyde raw materials and air, wherein the gas-liquid reactor includes aldehyde feed pipes, air feed pipes, two-phase jet mixing nozzles and heat exchange elements. The aldehyde raw material is introduced into the two-phase jet mixing nozzle along the aldehyde feeding pipe, and the pressurized air is introduced into the two-phase jet mixing nozzle along the air feeding pipe, and the mixture of the aldehyde raw material and the pressurized air passes through the two-phase jet mixing nozzle to a height of After dispersion, enter the gas-liquid reactor. The aldehyde raw material and the air undergo an oxidation reaction in the gas-liquid reactor to form an acid, and the heat released by the oxidation reaction is removed from the gas-liquid through the heat exchange element set in the gas-liquid reactor. reactor.

Description

technical field [0001] The disclosure relates to a gas-liquid reactor, in particular to a spray-type gas-liquid reactor for preparing acid by using aldehyde raw materials and air. Background technique [0002] The process of preparing acid from aldehyde by air or oxygen oxidation is a gas-liquid reaction in which the gas phase is the dispersed phase and the liquid phase is the continuous phase. Applicable reactor types mainly include bubble column reactor, stirred tank reactor, tower reactor, etc. The most common in industry are bubble column reactors and stirred tank reactors. [0003] In the bubble column reactor, the gas phase enters from the bottom of the tower, and passes through the liquid layer in the form of bubbles from bottom to top through the gas distributor. The liquid phase can be fed from the top of the reactor or from the bottom of the reactor to form a gas-liquid Two-phase countercurrent or cocurrent flow, gas-liquid phase contact for reaction. Bubble col...

AI Technical Summary

Problems solved by technology

The disadvantage of the bubble column reactor is that the liquid back-mixing is serious, the bubble size is large and easy to coalesce, so the mass transfer efficiency is low (mass transfer efficiency is defined as the transfer speed of the substance between the gas phase and the liquid phase) and the reactant conversion The proportion of the target product is low, that is, the reaction selectivity is low

[0004] Compared with the bubble column reactor, the stirred tank reactor has enhanced heat transfer and mass transfer due to the addition of a stirring device, but there is a problem with the sealing of the stirring shaft in engineering, especially for high temperature, high pressure and strong corrosion operating conditions For large reactors, this problem will be more prominent

At the same time, the power consumption is also larger than that of the general bubble tower

In addition, the stirred tank reactor also has the problem of low mass transfer efficiency and low conversion ratio of reactants to target products, that is, low reaction selectivity.

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