Preparation method of anhydrous monosodium citrate

Abstract

The invention discloses a preparation method of anhydrous monosodium citrate. Food-grade anhydrous citric acid and food-grade sodium citrate are taken as raw materials, and the anhydrous monosodium citrate is prepared after the steps of proportioning mixing, stirring reaction , pH value adjusting, standing for crystallization, centrifugal separation, drying and the like. The anhydrous citric acidis acidic, the sodium citrate is alkaline, neutral reaction between the anhydrous citric acid and the sodium citrate is formed in an evaporator, the reaction is thorough, crystals are easily formed, the yield is high, the crystallization time in the evaporator is short, the concentration time is reduced, the energy consumption is reduced, the anhydrous citric acid and the sodium citrate are takenas raw materials, the process is simple, mother liquid can be recycled after formed monosodium citrate crystals are separated from the mother liquid , no carbon dioxide waste gas is generated during the reaction process, environmental pollution is avoided, and the method is clean and environmentally friendly and conforms to the basic state policies of energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of production of food, medicine, daily chemical additives, and chemical regulator raw materials, in particular to a production method of anhydrous monosodium citrate. Background technique [0002] Monosodium citrate is white granular crystal or powder, odorless, salty, soluble in water, almost insoluble in ethanol, slightly deliquescent in humid air, can be used as an acidity regulator in food processing, medicine, daily chemical and chemical production. [0003] Monosodium citrate is used as a food additive and has the largest demand. Mainly used as condiment, buffer, emulsifier and stabilizer, the usage amount is 0.2% to 0.3%, and it is often used in combination with citric acid in various jams, jellies, juices, beverages, cold drinks, dairy products, cakes, cheese and Nutritional supplement and flavoring agent for cooked ham, the dosage is about 2g / kg. When used in food processing, its pH value should ...

AI Technical Summary

Problems solved by technology

This method uses high-quality baking soda, dissolves it in water according to the calculated amount, neutralizes it with citric acid, and processes it through concentration and crystallization to prepare pharmaceutical grade monosodium citrate, but the cost is high and the investment is large.

[0011] The monosodium citrate prepared by the above-mentioned various methods has a large water content, and the use of monosodium citrate raw materials in various fields has a moisture content requirement, that is, moisture≤0.5%, and usually only produces two crystal waters on the market at present. Monosodium citrate, the moisture content of this sodium citrate reaches 10.0~13.0%. Because the moisture content is too high, it is not suitable for direct use. In order to meet the production needs of various fields, it is necessary to further treat monosodium citrate to reduce Its moisture content has therefore increased the complexity of the process in each production and processing field and increased production costs. Based on the above factors, it is necessary to research and develop a new production technology for monosodium citrate to directly produce anhydrous lemons with low moisture content. monosodium acid to meet the requirements of food processing, medicine, daily chemical and chemical production fields

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