Refining method for anhydrous sugar alcohol, anhydrous sugar alcohol and resins
An anhydrous sugar alcohol and refining method technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of low stability of isosorbide and decomposition over time
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Embodiment 1
[0160] [Example 1: Purification of anhydrous sugar alcohol (purification 1)]
[0161] In a reduced-pressure reactor equipped with a stirrer, 1,930 g of an aqueous solution of 70% by mass of sorbitol was added, and water was distilled off under conditions of 5 kPa and 120°C. Next, 15 g of 98% concentrated sulfuric acid was added to the obtained residue, and they were made to react at 5 kPa and 120 degreeC conditions for 5 hours. The obtained product was cooled to 90° C., and 24 g of a 50% by mass sodium hydroxide aqueous solution was added for neutralization, and water was distilled off at 5 kPa and 120° C. to obtain crude anhydrous sugar alcohol (unrefined anhydrous sugar alcohol ) 1080g. The content of the anhydrosugar alcohol contained in the crude anhydrosugar alcohol was calculated by gas chromatography. 0.05 parts by mass of hindered amine compound (B-1) was mixed with the calculated anhydrous sugar alcohol content (100 parts by mass), and distilled at 1 kPa and 200° C....
Embodiment 2
[0162] [Example 2: Purification of anhydrous sugar alcohol, purification 2]
[0163]In a reduced-pressure reactor equipped with a stirrer, 1,930 g of an aqueous solution of 70% by mass of sorbitol was added, and water was distilled off under conditions of 5 kPa and 120°C. Next, 15 g of 98% concentrated sulfuric acid was added to the obtained residue, and they were made to react at 5 kPa and 120 degreeC conditions for 5 hours. The obtained product was cooled to 90° C., and 24 g of a 50 mass % sodium hydroxide aqueous solution was added for neutralization to obtain 1,090 g of crude anhydrous sugar alcohol. 0.05 parts by mass of hindered amine compound (B-1) was mixed with the anhydrous sugar alcohol content (100 parts by mass) calculated in the same manner as in Example 1, and water was distilled off at 5 kPa and 120° C. Further, by distilling at 1 kPa and 200° C. for 10 hours, 783 g of anhydrous sugar alcohol composition containing purified anhydrous sugar alcohol and hindered...
Embodiment 3
[0164] [Example 3: Purification of anhydrous sugar alcohol (purification 3)]
[0165] In a reduced-pressure reactor equipped with a stirrer, 1,930 g of an aqueous solution of 70% by mass of sorbitol was added, and water was distilled off under conditions of 5 kPa and 120°C. Next, 57 g of p-toluenesulfonic acid monohydrate was added to the obtained residue, and they were made to react at 5 kPa and 150 degreeC conditions for 20 hours. The obtained product was cooled to 90° C., neutralized by adding 24 g of a 50% by mass sodium hydroxide aqueous solution, and water was distilled off at 5 kPa and 120° C. to obtain 1,080 g of crude anhydrous sugar alcohol. 0.05 parts by mass of hindered amine compound (B-1) was mixed with the anhydrous sugar alcohol content (100 parts by mass) calculated by the same method as in Example 1, and distilled at 1 kPa and 200° C. for 10 hours to obtain 786 g of refined anhydrous sugar alcohol and hindered amine anhydrous sugar alcohol composition.
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