Method for preparing terpin hydrate by virtue of continuous hydration

Abstract

The invention discloses a method for preparing terpin hydrate by virtue of continuous hydration. The method is characterized by comprising the following steps of: under the conditions of certain acidity, temperature and acid water quantity, carrying out the continuous hydration on turpentine or pinene utilized as a raw material in a way of continuously feeding and discharging; and controlling the reaction temperature by adjusting the acid water concentration and the quantity of the acid water and red oil according to the detection data and the weight of materials, thus obtaining the terpin hydrate. Compared with the traditional intermittent hydration method, the method can be used for improving the production efficiency of the terpin hydrate by more than 30%, achieving the yield of 100% and improving the yield by 10%, and has the advantages of being high in production efficiency and yield, simple and convenient in technology, free from pollution, low in production cost, and the like.

Description

technical field [0001] The present invention relates to a method for continuous hydration, in particular to a method for preparing terpene diol hydrate through continuous hydration. Background technique [0002] Terpineol is a bulk spice product, with an annual domestic output of more than 30,000 tons. It is widely used in pharmaceuticals, soaps, cosmetics, blending essences, and foaming agents for flotation of non-ferrous metals. It is the main export variety in my country, and the export market There are also signs of increasing year by year, and export prices have been relatively stable. my country is rich in turpentine resources, with an annual output of more than 100,000 tons, and its main component is pinene. The most important way to utilize turpentine is to synthesize terpineol. [0003] At present, there are mainly two methods for producing terpineol with pinene as a raw material: one-step method and two-step method: one-step method is that pinene is directly hydra...

AI Technical Summary

Problems solved by technology

Since the hydration reaction needs to consume water in the aqueous acid solution, the concentration of the acid water after the reaction in the intermittent hydration is several points higher than that before the reaction, and the higher concentration of the acid water will directly dehydrate the terpene diol into alcohol, and continue to Dehydration produces terpene by-products, resulting in a decrease in yield

Simultaneously, because the intermittent hydration reaction time is longer, the retention time of the product terpene diol in the acid aqueous solution also increases correspondingly, resulting in the obtained hydrated terpene diol crystals being older, with large particles and high acid content, which will bring problems to the subsequent dehydration process. It is troublesome and brings a lot of waste water and waste acid to the production

And, according to the analysis of the production situation, although this hydration reaction belongs to a mature traditional process, there are still some obvious shortcomings as follows: 1) the hydration yield is not high: in production, the pinene hydration reaction makes the weight of the hydration terpene diol The yield is generally around 85%, and in relatively good factories, the yield of terpene diol hydrate can only reach about 90%, which is only 70% of the theoretical yield, and there is still a lot of room for improvement; 2) Treatment Low capacity and low production efficiency

Because the intermittent hydration reaction takes a long time, usually more than 20 hours, and the solid content in the reactor after the reaction is high, it takes a long time to discharge, so each reactor can only produce one batch per day Terpene diol hydrate, even if calculated at a weight yield of 90%, the daily production capacity is less than 1.5 tons of terpene diol hydrate; 3) The quality of the terpene diol hydrate obtained is unstable

Due to the long reaction time, the hydrated terpene diol crystal particles are relatively coarse, and the acid water and oil content contained therein vary greatly, which brings great inconvenience to the subsequent treatment and dehydration reaction, not only produces a large amount of waste water, but also thus increasing the cost of production