A continuous rectification system for producing alcohol ester twelve and its method for producing alcohol ester twelve

Abstract

The invention discloses a continuous rectification production system and method of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (Texanol) and belongs to the field of organic synthesis. The system comprises a first stock tank, a second stock tank, a rectification reaction tower, a water separating tank, a continuous precise filter and a finishing tower; a first metering pump is arranged in the first stock tank, a second metering pump is arranged in the second stock tank, a filler layer is arranged in the rectification reaction tower and is divided into five sections from top to bottom, the first stock tank is connected with the upper portion of the third section of the filler layer through a pipeline, the second stock tank is connected with the lower portion of the third section of the filler layer through a pipeline, the top of the rectification reaction is connected with the water separating tank through a pipeline, the bottom of the rectification reaction tower is connected with an inlet of the continuous precise filter through a pipeline, an outlet of the continuous precise filter is connected with the middle of the finishing tower through a pipeline, and the top of the finishing tower is provided with an outlet.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a continuous rectification system for producing alcohol ester twelve and a method for producing alcohol ester twelve. Background technique [0002] Dodecyl alcohol ester, scientific name 2,2,2-trimethyl-1,3-pentanediol monoisobutyrate, commercial name alcohol ester twelve (CS-12), structural formula: . [0003] Dodecyl alcohol ester is a new green additive, which is more and more widely used. Compared with common film-forming aids, CS-12 has many advantages: good resin compatibility, less dosage, low film-forming temperature, and film leveling Good color development, low freezing point, good hydrolytic stability and low toxicity, it is an excellent film-forming agent for latex paint, and can be effectively used in polyvinyl acetate homopolymers, copolymers and terpolymers , and in latexes such as pure acrylic, styrene / acrylic, polybutadiene styrene, and vinyl vinyl...

AI Technical Summary

Problems solved by technology

[0004] Patent CN1429809A introduces a method for preparing 2,2,2-trimethyl-1,3-pentanediol monoisobutyrate, the method adopts batch operation, two-stage heating and two-step reaction are carried out with the same catalyst system Reaction, wherein the reaction temperature of the first stage is preferably 20-40°C, the reaction time is 1-4h, and the reaction temperature of the second stage is preferably 60-80°C, and the reaction time is 5min-10h. When the aldehyde conversion rate reaches When it is more than 80%, diol monoester with a purity of 90% or higher selectivity can be obtained, and the maximum content of the by-product 2,2,4-trimethyl-1,3-pentanediol does not exceed 8%, although the reaction Works well, but takes longer to respond

[0005] At present, the conventional production process of alcohol ester 12 uses batch reactors to produce alcohol ester 12. Before the reaction, it is necessary to submit the pre-preparation of the reaction raw materials. The production capacity of each reactor is limited. To expand the production capacity, it is necessary to increase more The reaction kettle is used to meet the needs of production, which occupies a large area, high production cost, and low production efficiency; the new process of producing alcohol ester twelve by continuous reaction distillation can reduce equipment investment, reduce production sites, reduce production costs, and greatly improve production. efficiency

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