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Method for preparing adipic acid dimaltitol ester

A technology of dimaltose adipate and maltitol, which is applied in the preparation of sugar derivatives, chemical instruments and methods, sugar derivatives, etc., can solve the problems of accelerating the thermal degradation of PVC and the high price of organic tin bases, and achieves low cost and high technology. The effect of simple and feasible process and simple preparation method

Active Publication Date: 2014-08-13
慧科高新科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of organic tin base is high, while the relatively cheap zinc base has broad-spectrum applicability and has more room for development
The biggest disadvantage of zinc-based heat stabilizers is that it is easy to produce ZnCl 2 , ZnCl 2 It can catalyze the removal of HCl from PVC and accelerate the thermal degradation of PVC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First mix 60g of adipic acid and 300g of maltitol with a high-speed mixer, add to the reactor, heat up to 165°C, add 30mL of cyclohexane and 12g of concentrated sulfuric acid, react for 5h under stirring, then vacuum filter for 15min After that, light yellow dimaltitol adipate was obtained. After testing, the esterification rate was 91.2%, and the yield was 89.4% (the main loss was the product adhering to the reactor wall).

Embodiment 2

[0017] First, mix 80g of adipic acid and 360g of maltitol with a high-speed mixer, add to the reactor, heat up to 140°C, add 50mL of toluene and 24g of p-toluenesulfonic acid, react for 4 hours while stirring, then vacuum filter for 15 minutes After that, light yellow dimaltitol adipate was obtained. When the product was warmed to 75°C, 80g of dry CaO was added, after vigorous stirring, the material was discharged and pulverized to obtain a powdery mixture. After testing, the esterification rate is 92.8%, and the yield is 96.5% (adding CaO can reduce the product adhering to the reactor wall and increase the yield).

Embodiment 3

[0019] First mix 75g of adipic acid and 330g of maltitol with a high-speed mixer, add to the reactor, heat up to 160°C, add 35mL of benzene and 24g of p-toluenesulfonic acid, react for 4 hours under stirring, and then vacuum filter for 15 minutes After that, light yellow dimaltitol adipate was obtained. When the product was warmed to 60°C, 90g of dry CaO was added, and after vigorous stirring, the material was discharged and pulverized to obtain a powdery mixture. After testing, the esterification rate is 93.1%, and the yield is 97.8% (addition of CaO can reduce the product adhering to the reactor wall and increase the yield).

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Abstract

The invention relates to a method for preparing adipic acid dimaltitol ester, which belongs to the field of plasticizers and auxiliary heat stabilizers for polyvinyl chloride processing. Adipic acid and maltitol are mixed with each other to be subjected to esterificated reaction under the action of a catalyst at 140-165 DEG C. Cyclohexane, benzene and toluene are takes as water-carrying agents to separate water out during the reaction process, so that the esterification rate is increased. Concentrated sulphuric acid and p-toluenesulfonic acid are taken as the catalysts, and the usage amount of the catalysts accounts for 20-30% of the mass of the adipic acid. The easterification reaction time is between 4 and 5 hours, and the faint yellow oily adipic acid dimaltitol ester is obtained after the reaction is completed. The prepared adipic acid dimaltitol ester has high esterification degree, the preparation method is simple, the catalysts and unreacted adipic acid and maltitol do not need to be separated out after the esterification is completed, and the product can be directly used as a polyvinyl chloride (PVC) processing agent. Through adding CaO, a powdery product can also be obtained, and the use of adipic acid dimaltitol ester is benefited.

Description

technical field [0001] The invention relates to a preparation method of dimaltitol adipate, which belongs to the field of plasticizers and auxiliary heat stabilizers for polyvinyl chloride (PVC) processing. Background technique [0002] Maltitol is a sugar alcohol obtained by hydrogenation of maltose. It has 9 hydroxyl groups and is often used as a functional sweetener. Some people also prepare maltitol esters, such as Peng Dongmei et al. "Study on the preparation of maltitol fatty acid esters, Jiangsu Chemical Industry, 2008, 36 (6): 29-32", but no one has prepared dimaltitol adipate. Maltitol has many hydroxyl groups and is easy to esterify. However, due to its complex structure, the position of esterification is uncertain, the quality is not easy to control, and the product is not easy to purify and separate, which limits its application. The field of use of the prepared dimaltitol adipate is a PVC processing aid, and the position of esterification does not affect the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H15/04C08K5/1545C08K3/22C08L27/06C07H15/06C07H1/00
Inventor 李德刚唐守余
Owner 慧科高新科技股份有限公司
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