Toluene diisocyanate manufacturer Knowledge [Sorbitol supply] Several synthesis methods of sorbitol

[Sorbitol supply] Several synthesis methods of sorbitol

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Sorbitol, also known as sorbitol. It is white hygroscopic powder or crystalline powder, flakes or granules, odorless. Depending on the crystallization conditions, the melting point changes in the range of 88~102℃, and the relative density is about 1.49. Easily soluble in water (1g dissolves in about 0.45mL water), slightly soluble in ethanol and acetic acid. It has a refreshing sweetness, the sweetness is about half that of sucrose, and its caloric value is similar to that of sucrose. According to the understanding of sorbitol supply: in the food industry, sorbitol liquid with a content of 69~71% is mostly used. Sorbitol liquid is a clear, colorless, syrupy liquid with a sweet taste, neutral to litmus, and miscible with water, glycerin and propylene glycol. Can be used as nutritive sweetener, humectant, chelating agent and stabilizer.

Several synthesis methods of sorbitol:

1. Add the prepared 53% glucose aqueous solution to the autoclave, and add 0.1% of glucose by weight. Nickel catalyst. After replacing the air, hydrogenation is carried out under conditions of about 3.5MPa, 150°C, and pH 8.2-8.4, and the end point is controlled to keep the residual sugar below 0.5%.

After precipitation for 5 minutes, the resulting sorbitol solution is refined through ion exchange resin. Raw material consumption quota: hydrochloric acid 19kg/t, liquid alkali 36kg/t, solid alkali 6kg/t, aluminum-nickel alloy powder 3kg/t, oral sugar 518kg/t, activated carbon 4kg/t.

2. It is produced by using refined glucose obtained from starch saccharification and medium-pressure continuous or intermittent hydrogenation.

3. Add 53% glucose aqueous solution (pH=8.2~8.4 with alkali solution in advance) and 0.1% glucose mass nickel-aluminum catalyst into the autoclave, exhaust the air and proceed with the reaction, and control the temperature. 150℃, pressure 3.5MPa. When the glucose content reaches below 0.5%, the reaction reaches the end point. Leave to settle and filter. The filtrate is refined with strong acidic styrene-based cation exchange resin 001×7 and strong alkaline ammonium type I anion exchange resin 201×7 to remove impurities such as nickel and iron to obtain the finished product D-sorbitol.

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