Method for preparing 1,4-sorbitan

A kind of technology of sorbitan, sorbitol, applied in the field of preparation of 1,4-sorbitan, can solve problems such as increasing catalyst cost, no specific pointing out, etc.

Active Publication Date: 2017-12-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is mentioned in the literature (Catal.Sci.Technol., 2013,3,1540--1546) that SnCl can be used 4 and AlCl 3 As a catalyst to catalyze the dehydration of sorbitol to obtain 1,4-sorbitol and 3,6-sorbitol, but it does not specify the ratio of 1,4-sorbitol
Patent 201410294984 developed a method of using formic acid to replace the inorganic acid catalyst, but this method requires the participation of additional noble metal Pd, which increases the cost of the catalyst

Method used

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  • Method for preparing 1,4-sorbitan
  • Method for preparing 1,4-sorbitan
  • Method for preparing 1,4-sorbitan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 30g of water to the reaction kettle, heat to 40°C, add 3g of sorbitol dropwise into the water under vigorous stirring, after stirring evenly, add 0.3g of sodium bisulfate catalyst, raise the temperature to 140°C, and react for 4h , through liquid chromatography, using the external standard method to test the product, the conversion rate of sorbitol reaches 90%, and the selectivity of the product 1,4-sorbitol reaches 81%.

Embodiment 2～5

[0023] The reaction process of Example 1 was repeated, except that the reaction conditions were different from the used solvent and catalyst. The specific reaction conditions and results of each embodiment are listed in Table 1.

[0024] Table 1, embodiment 2~5 specific reaction conditions

[0025]

Embodiment 6

[0027] Add 50g of methyl isobutyl ketone into the reaction kettle, heat to 60°C, stir vigorously, add the catalyst NaH 2 PO 4 0.2g, after stirring evenly, 3.5g sorbitol was added dropwise to the solvent under the condition of vigorous stirring. The temperature was raised to 160° C., and the reaction was carried out for 6 hours. The product was tested by liquid chromatography and external standard method. The conversion rate of sorbitol was 95%, and the selectivity of the product 1,4-sorbitol reached 85%.

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Abstract

The invention discloses a method for preparing 1,4-sorbitan. According to the method, sorbitol is used as a substrate, a molecule with strong polarity is used as a solvent, and 1,4-sorbitol is highly selectively prepared under the action of an acid salt catalyst. The method uses a combination of the special solvent and an acid salt, thereby realizing high selectivity of 1,4-sorbitol during dehydration of sorbitol.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a preparation method of 1,4-sorbitol. Background technique [0002] 1,4-Sorbitol is the product of sorbitol dehydration, which is widely used in industry. Its fatty acid ester derivatives are excellent environment-friendly surfactants and non-toxic food additives. 1,4 -Sorbitan is also a raw material for Span and Tween surfactants. [0003] In recent years, with the depletion of petroleum resources, more and more attention has been paid to biomass-based resources. 1,4-Sorbitan has attracted much attention because of its excellent performance in downstream products. 1,4-Sorbitol is usually obtained by dehydration of sorbitol under the catalysis of inorganic acid. But the current method is difficult to obtain high-purity 1,4-sorbitol. There are two main reasons for this. One is that sorbitol has multiple hydroxyl groups, which makes it have a variety of dehydration products, ...

Claims

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Application Information

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IPC IPC(8): C07D493/04C07D307/20
CPCC07D307/20C07D493/04
Inventor 杜文强徐杰石松苗虹高进郑玺
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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