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...

Examples

Embodiment Construction

[0014] Hereinafter, the main structural features and advantages of the reaction device of the present invention will be respectively introduced through specific embodiments.

[0015] figure 1 It is a schematic diagram of an esterification reaction device in a preferred embodiment of the present invention. In the reaction device, according to the delivery order of the feed liquid, there are feed pump 1, suction injector 2, reaction tube 4, lifting discharge tube 5, circulation pump 3, and hydrocyclone 6. The above parts are connected through pipelines as shown in the figure, and valves can be set to adjust the flow and pressure.

[0016] The light phase outlet of the hydrocyclone, that is, the upper outlet, is connected to the feed pump, and is used as the crude product outlet when the reaction ends; the heavy phase outlet of the hydrocyclone, that is, the lower outlet, is connected to the catalyst reflux inlet at the bottom of the reaction tube, also Catalyst can be recovere...

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...

Examples

Embodiment Construction

[0014] Hereinafter, the main structural features and advantages of the reaction device of the present invention will be respectively introduced through specific embodiments.

[0015] figure 1 It is a schematic diagram of an esterification reaction device in a preferred embodiment of the present invention. In the reaction device, according to the delivery order of the feed liquid, there are feed pump 1, suction injector 2, reaction tube 4, lifting discharge tube 5, circulation pump 3, and hydrocyclone 6. The above parts are connected through pipelines as shown in the figure, and valves can be set to adjust the flow and pressure.

[0016] The light phase outlet of the hydrocyclone, that is, the upper outlet, is connected to the feed pump, and is used as the crude product outlet when the reaction ends; the heavy phase outlet of the hydrocyclone, that is, the lower outlet, is connected to the catalyst reflux inlet at the bottom of the reaction tube, also Catalyst can be recovere...

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