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Method for preparing anhydrous sugar alcohol

An anhydrous sugar alcohol and hydrogenated sugar technology, which is applied in the preparation of organic compounds, organic chemistry methods, chemical instruments and methods, etc., can solve the problems of high catalyst cost, low conversion rate, low distillation and refining yield, etc. The effect of low rate, low cost, and improved color characteristics

Active Publication Date: 2015-06-24
SAMSANG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing preparation method of anhydrous sugar alcohol, the catalyst cost for the dehydration reaction is high, and the conversion rate, distillation and refining yield are low

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0013] [Step (1)] The method for producing anhydrous sugar alcohol of the present invention includes the step of subjecting hydrogenated sugar to a dehydration reaction to convert it into anhydrous sugar alcohol.

[0014] The hydrogenated sugar (hydrogenated sugar) is generally also called a sugar alcohol (sugar alcohol), and means a compound obtained by adding hydrogen to a reducing terminal group of sugar. Hydrogenated sugars are classified into tetitol, pentitol, hexitol and heptitol according to the number of carbons (the number of carbons is 4, 5, 6 and 7, respectively). Among them, hexitols having 6 carbons include sorbitol, mannitol, iditol, galactitol, and the like. Sorbitol and mannitol are particularly potent substances.

[0015] The "anhydrosugar alcohol" mentioned in this specification means any substance obtained by removing one or more water molecules from the original internal structure of the hydrogenated sugar in one or more steps by any means.

[0016] In t...

Embodiment 1

[0052] Put 1,200g of sorbitol powder (D-sorbitol, SAMYANG GENEX Co., Ltd.) into a 4-port glass reactor with a stirrer, heat up to 110°C to melt, then drop into 12g of concentrated sulfuric acid (German Shan Chemical, 95%) and 7.2 g of methanesulfonic acid (Sigma, 70%), the temperature of the reaction mixture was raised to about 135°C. Maintaining this temperature, a dehydration reaction was carried out for 4 hours under a vacuum condition of 40 torr, thereby converting the starting material sorbitol into anhydrous sugar alcohol, ie isosorbide. Afterwards, reactant temperature is down to 110 ℃, in reaction result liquid, add the 50% sodium hydroxide solution of about 31.2g (Santa pure medicine ( )) to neutralize.

[0053] The neutralized anhydrous sugar alcohol is distilled at 180° C. under a vacuum below 5 torr using a thin-film distiller. The purity of the obtained anhydrous sugar alcohol distillate was 97.5%.

[0054] The obtained distillate was placed in a jacketed re...

Embodiment 2

[0058] After the anhydrous sugar alcohol converted liquid obtained in Example 1 was distilled for the first time at 180° C. under 5 torr, the obtained distillate (purity 97.5%) was subjected to the second distillation at 150° C. under 1 torr. second distillation. At this point the purity of the distillate was 98.5%. The secondary distillate (purity: 98.5%) was purified in the same order as in Example 1, in the order of crystallization, decolorization, cationic ion exchange resin treatment, and anionic ion exchange resin treatment. The final purity of the obtained anhydrosugar alcohol was 99.8%.

[0059] The ion content, pH, electrical conductivity, and YI value of the finally refined anhydrous sugar alcohol were analyzed and evaluated in the same way as in Example 1. The analysis results are shown in Table 1 below.

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Abstract

The present invention relates to a method for preparing anhydrous sugar alcohol, and more particularly, to a cheap and highly efficient method for preparing anhydrous sugar alcohol having a high final purity of at least 99%, and having good ion content, pH, conductivity, and color properties. According to the method, a hydrogenated sugar is dehydrated so as to be transformed into anhydrous sugar alcohol, and a series of processes including distillation, crystallization, decoloration, and ion exchange resin treatment are conducted.

Description

technical field [0001] The present invention relates to a preparation method of anhydrous sugar alcohol, more specifically, relates to a method of converting hydrogenated sugar into anhydrous sugar alcohol through dehydration reaction, followed by a series of distillation, crystallization, decolorization and ion exchange resin process, so as to prepare the anhydrous sugar alcohol with a final purity of more than 99% and a high purity with excellent ion content, pH, conductivity and color properties at low cost and high efficiency. Background technique [0002] Hydrogenated sugars (also called "sugar alcohols") are compounds obtained by adding hydrogen to the reducing terminal groups of sugars. Generally has the chemical formula HOCH 2 (CHOH) n CH 2 OH (wherein, n is an integer from 2 to 5), can be divided into tetraitol (tetritol), pentitol (pentitol), hexitol (hexitol) and heptitol (heptitols) according to the number of carbons (number of carbons) 4, 5, 6 and 7 respecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C29/94C07C31/26B01J31/02
CPCB01J31/0225C07D493/04C07B63/00B01J2231/70C07C29/80C07C29/94C07C31/26B01J31/02
Inventor 柳熏郑英在金昣炅庆岛显朴爀珉曹成镐
Owner SAMSANG CORP
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