Esterification reactor and esterification reaction method based on solid catalyst

Abstract

The invention relates to an esterification reactor based on a solid catalyst and a long-chain fatty acid esterification method using the same. The esterification reactor comprises a reaction tube, a feed pump, a circulating pump and a solid-liquid separator, wherein the outlet of the feed pump is connected to the bottom end of the reaction tube, so that the feed pump can send reaction raw materials and a reaction liquid part from a reaction chamber into the reaction chamber; the inlet of the circulating pump is connected with the reaction chamber, so that the circulating pump can be used for selectively outputting reaction products in multiple positions in the height direction of the reaction chamber; and the inlet of the solid-liquid separator is connected with the outlet of the circulating pump, so that the solid-liquid separator can be used for separating the reaction products from the circulating pump into the reaction liquid part and a solid catalyst-enriched slurry part. The light phase outlet of the solid-liquid separator is used as a crude product outlet and connected to the feed pump, so that the reaction liquid part flows back to the reaction chamber; and the heavy phaseoutlet of the solid-liquid separator is used as a solid catalyst recovery outlet and connected to the bottom end of the reactor, so that the slurry part flows back to the reaction chamber. The invention can greatly enhance the catalyst separation effect, reduce the circulating pump abrasion caused by the catalyst and enhance the esterification efficiency of the fatty acid.

Description

technical field [0001] The invention relates to an esterification reaction device and an esterification reaction method based on a solid catalyst. Background technique [0002] Fatty acid esters, such as long-chain fatty acid esters, can be synthesized by esterification of fatty acids and alcohols under the action of acidic catalysts. At present, the commonly used catalysts in industry are sulfuric acid, benzenesulfonic acid and other organic acids or inorganic acids that can be dissolved or uniformly dispersed in the reaction solution, which are called homogeneous catalysts. The contact effect between the homogeneous catalyst and the reaction raw materials is excellent, so the catalytic efficiency is high; however, after the reaction, the acidic catalyst is difficult to separate and recover from the reaction system and reused, and usually can only be discharged with the wastewater. For this reason, people have developed a variety of solid acidic catalysts for the esterific...

AI Technical Summary

Problems solved by technology

It is difficult for these catalyst powders to be completely separated and recovered by standing and settling, which not only requires a longer settling time, but also will be mixed with the reaction liquid when it is discharged, causing a large loss; (2) a large amount of solid catalysts are suspended in the reaction liquid and flow repeatedly Through the circulation pump, the impeller and volute of the circulation pump will be continuously worn, resulting in a significant decrease in the life of the circulation pump; (3) The solid particle content must be controlled within the normal operating range of the circulation pump, which will greatly limit the amount of catalyst used and cannot pass Greatly increase the solid-to-liquid ratio to increase reaction efficiency

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