[Sorbitol supply] Several synthesis methods of sorbitol

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.