Device and method for drying triethylamine in acesulfame potassium production

Abstract

The invention discloses a drying device for triethylamine in acesulfame potassium production. The drying device comprises a head tank, N anhydrous calcium chloride drying towers, a transfer tank, a molecular sieve drying tower and a waste liquid tank, the head tank blanking pipe is provided with a feeding branch pipe corresponding to each anhydrous calcium chloride drying tower and is connected with a corresponding material inlet; a material outlet of each anhydrous calcium chloride drying tower is connected with a discharging branch pipe and is connected with the transfer tank; a serial connection pipe is arranged between the material outlet and the material inlet of the adjacent anhydrous calcium chloride drying tower, the transfer tank is connected with the molecular sieve drying tower through a connection pipe, the anhydrous calcium chloride drying tower and the molecular sieve drying tower are connected with a waste discharge pipe, and the waste discharge pipe is connected with a waste liquid tank; the drying method comprises the following steps: a triethylamine crude product enters the anhydrous calcium chloride drying towers connected in series from the head tank, and then enters the molecular sieve drying tower through the transfer tank to form a finished product triethylamine. The drying effect is good, the cost is low, and the use efficiency of triethylamine is further improved.

Description

technical field [0001] The invention relates to a drying device and method for triethylamine in the production of acesulfame potassium. Background technique [0002] Triethylamine is an important raw material for the production of acesulfame-K, and is widely used as a catalyst. Triethylamine has the physical and chemical properties of being slightly soluble in water. Therefore, it is necessary to use solid potassium hydroxide to reduce its moisture in the recovery process. Although the waste liquid potassium hydroxide recovered after drying can be used as acesulfame potassium neutralization in the previous process, that is, it reacts with acesulfame potassium to generate acesulfame potassium (acesulfame potassium), but because the neutralization reaction is the last step, Many impurities such as triethylamine are included in the waste liquid potassium hydroxide, which greatly affects the product quality. If it is not used for neutralization, it will cause a great waste of re...

AI Technical Summary

Problems solved by technology

Although the waste liquid potassium hydroxide recovered after drying can be used as the neutralization of acesulfame potassium in the previous process, that is, it reacts with acesulfame potassium to generate acesulfame potassium (acesulfame potassium), but because the neutralization reaction is the last step, Many impurities such as triethylamine are included in the waste liquid potassium hydroxide, which greatly affects the product quality. If it is not used for neutralization, it will cause a great waste of resources and cause environmental pollution. At the same time, the triethylamine after potassium hydroxide drying The water content of the amine is 0.14. This part of the water entrains some potassium hydroxide, which will react with the sulfamic acid in the synthesis reaction of the previous section, affecting the progress of the synthesis reaction and the quality of the intermediate, and the price of potassium hydroxide is relatively expensive, making drying higher process cost

[0003] The process equipment in the prior art is generally processed by the process equipment disclosed in Chinese patent CN 103585785 B. The problem with this method is that all drying towers are designed in series, and there is no backup tower. Once the drying tower fails, the entire process will stagnate. , seriously affecting production

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