A kind of low temperature granulation method of solid sodium lactate

Abstract

The invention provides a solid sodium lactate low-temperature granulation method. The method comprises the following steps: (1) a sodium lactate solution is subjected to reduced-pressure evaporation by using a thin-film evaporator, wherein sodium lactate content in the solution is increased to 90-92wt% within 5min; and the obtained solution is discharged. During the reduced-pressure evaporation process, the pressure of the jacket heating steam of the thin-film evaporator is controlled at 0.2-0.4MPa, the temperature in the thin-film evaporator is controlled at above 90 DEG C, and the pressure in the thin-film evaporator is controlled at 0.04-0.05MPa; (2) the concentrated solution is pressed into a rotating centrifugation spray granulation machine through compressed air, and the temperature of the concentrated solution is maintained at above 90 DEG C, such that the concentrated solution is spayed as a mist from a high-speed rotation disk on the upper part of the granulation machine; at a same time, cold air with a temperature of 4-15 DEG C is synchronously delivered from above the granulation machine, and the temperature of cold air delivered out from the lower side part of the granulation machine is no higher than 45 DEG C; liquid mist is subjected to heat-exchange with the cold air, and is cooled and solidified, such that sodium lactate solid crystallized powder is obtained. According to the invention, low-temperature granulation is adopted, such that production efficiency is high, and heat energy utilization rate is greatly improved. The method is suitable for popularization and production.

Description

technical field [0001] The invention relates to the field of lactic acid products, in particular to a low-temperature granulation method of solid sodium lactate. Background technique [0002] Sodium lactate is a natural food additive widely used in many countries in Asia, Europe and the United States. It is considered as a "safe and non-toxic substance" by the US Food and Drug Administration. It can be used as an emulsifier, humectant, flavor improver, quality improver, antioxidant synergist and pH regulator, and is widely used in the meat and poultry food processing industry. It can enhance the flavor, inhibit the growth of pathogenic bacteria in food, and prolong the shelf life of products. [0003] When traditional sodium lactate is granulated, the method adopted is to use 60% sodium lactate solution and send it into a spray fluidized bed drying granulator to spray and dry it. The existing defects are: [0004] 1. The semi-finished liquid sodium lactate solution has a r...

AI Technical Summary

Problems solved by technology

The thermal efficiency utilization rate of dry hot air in the drying process is only 17%;

[0005] 2. During the hot air drying process, since the moisture in the material needs to be vaporized and separated before the material can be solidified, the process is difficult, and the production capacity of the unit equipment is not higher than 1.0 kg / m3 equipment space

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