Continuous dehydration esterification reaction device as well as continuous esterification reaction method

Abstract

The invention discloses a continuous dehydration esterification reaction device as well as a continuous esterification reaction method, belonging to the technical field of esterification reaction. A membrane reactor comprises a vertically fixed cylindrical housing (12) and a plurality of tubular molecule sieve membranes (13) axially fixed in the housing (12), wherein a fixed bed catalyst (14) is filled in the tubular molecular sieve membranes (13); the charging hole (18) of the membrane reactor is arranged at the lower end of the housing (12) and communicated with a material mixing and preheating device; the discharging hole (11) of the membrane reactor is arranged at the upper end of the housing (12) and communicated with a storage tank (33). The continuous esterification reaction method comprises the following steps of: mixing and adding alcohol and oleic acid in a molar ratio of 1:1-12:1 into the material mixing and preheating device, heating up to 75 DEG C-85 DEG C and feeding to the membrane reactor; reacting alcohol and oleic acid under catalytic action of the fixed bed catalyst (14), extracting water generated in the reaction by a dehydrating device to promote the reaction to be carried out toward a positive direction, and storing reaction products in the storage tank (33) through the discharging hole (11) of the membrane reactor.

Description

Technical field [0001] The continuous dehydration esterification reaction device and the continuous esterification reaction method belong to the technical field of esterification reaction, and specifically relate to a device for realizing a continuous esterification reaction and a method for performing a continuous esterification reaction using this device. Background technique [0002] The esterification reaction of alcohol and carboxylic acid is the most widely used method for the production of organic acid esters, but the esterification reaction of organic acid esters is a reversible process, and the reaction is extremely slow, and the conversion rate is limited. In order to solve this problem, the traditional process promotes the esterification reaction by heating and accelerating stirring, but the water generated in the reaction will inhibit the reaction from proceeding in the positive direction. Chinese patent 201220252788.1 provides a continuous esterification dehydration r...

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Problems solved by technology

In order to solve this problem, the traditional process promotes the esterification reaction by heating and accelerating stirring, but the water generated in the reaction will inhibit the reaction from proceeding in the positive direction. Chinese patent 201220252788.1 provides a biodiesel continuous esterification dehydration reaction device for To overcome the limitation of reaction balance, excessive alcohol components can be added to promote the reaction balance to move towards the positive reaction direction, and the dehydration device can be used to continuously collect the mixture of water vapor and methanol produced by the reaction to remove water and promote the movement of the balance, but this device still It is to allow the reaction materials to react in the reactor. After the reaction is completed, the reaction products are drawn out, and then the reaction in the next tank is carried out. In fact, it is still an intermittent reaction, and the continuous reaction is not completely achieved. Transfer takes a lot of time and reduces production efficiency

[0003] If the method of preparing biodiesel through the separation membrane uses the pore size of the separation membrane to separate the generated reaction products from the membrane tube, because the fatty acid molecules are relatively large, not only the fatty acid is separated during separation, but also the produced product glycerin or water and One of the reactants (low-carbon alcohol) is separated from the membrane tube, which causes part of the reaction material to be directly removed into the reaction product without participating in the reaction. The reaction efficiency is low, and the low-carbon alcohol that does not participate in the reaction must be recycled and reused. , correspondingly increasing the difficulty of energy consumption and product separation

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