Method for preparing anhydrous monosodium citrate

Abstract

The invention relates to a method for preparing a chemical product, in particular to a method for preparing anhydrous monosodium citrate, serving as a novel high-efficiency, environmentally-friendly and multifunctional plastic auxiliary agent. In the method, citric acid and caustic soda liquid are used as raw materials; monosodium citrate is prepared by using acid-base neutralization reaction; the requirement that drying decrement is less than 0.3 percent can be met by performing secondary drying for 8-10 hours by using a vacuum rotary drum at the temperature of 90-120 DEG C; then the requirement that the average grain diameter is 10-15mum can be met through crushing and sieving of a crusher; by adopting the method, the uniformity degree and the fineness degree of foams can be improved, and the number of the foams in a unit area of a product is increased, so that the dispersibility of a foaming agent is improved, a foam structure is stabilized, and the decomposition temperature and the decomposition rate of the foaming agent are adjusted. The method has the beneficial effects of providing an environmentally-friendly and nontoxic plastic product while enhancing the function of the conventional auxiliary agent.

Description

technical field [0001] The invention relates to a preparation method of chemical products, in particular to a preparation method of a novel high-efficiency, environment-friendly and multifunctional plastic additive anhydrous monosodium citrate. Background technique [0002] At present, the traditional plastic foaming aids include ethanolamine, ammonia water, urea diethylguanidine, lead oxide, etc. Foaming aids have a wide range of applications, large production and sales, and many modified varieties. The production process emits a large amount of highly polluting Organic nitrogen and ammonia nitrogen wastewater, also discharge acid mist, strong acid water, etc. In addition, there are serious deficiencies in the dispersibility and performance of these traditional plastic additives. The existing method for preparing sodium citric acid adopts the neutralization reaction of citric acid and sodium carbonate, and prepares monosodium citrate containing water through processes such...

AI Technical Summary

Problems solved by technology

In addition, there are serious deficiencies in the dispersibility and performance of these traditional plastic additives

The existing method for preparing sodium citric acid adopts the neutralization reaction of citric acid and sodium carbonate, and prepares monosodium citrate containing water through processes such as crystallization and drying. The sodium citric acid prepared by this method contains water of crystallization, and the crystal particles are too large to be To meet the requirements of plastic foaming agents, the particle size of anhydrous sodium citrate used in plastic foaming is required to be 10-15 μm, and the particle size is required to be fine and uniform, and there is a lack of corresponding granulation and detection methods. It has strong hygroscopicity in the natural environment. For special applications with strict water content requirements, there is no means to solve the problem of moisture absorption in the process of granulation, packaging, storage and transportation of the product.

There is no preparation of anhydrous citric acid-sodium as plastic additive method at present

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