Maltol chlorination reaction heat exchange method

Abstract

The invention relates to a maltol chlorination reaction heat exchange method. The method is characterized by: a. introducing a methanol aqueous solution into a chlorination kettle, starting a chlorination circulating pump to enable circulation flow of the methanol aqueous solution in the chlorination kettle and a plate type heat exchanger, changing the refrigerant of the plate type heat exchangerinto liquid ammonia, and controlling the pressure of a liquid ammonia storage tank at 1.0-1.5Mp, opening a plate type heat exchanger liquid ammonia inlet valve and introducing liquid ammonia, and controlling the gas phase pressure of a plate type heat exchanger liquid ammonia outlet at 0.3Mpa; b. when the temperature of the methanol solution in the chlorination kettle drops to -15DEG C, starting dropwise adding of furfuryl alcohol and introducing chlorine, adjusting an ammonia adding valve and the ammonia gas phase pressure to control the kettle temperature not higher than -8DEG C; and c. after all the furfuryl alcohol in an overhead tank is added dropwise, ending the reaction in the chlorination kettle, closing the ammonia adding valve, and performing discharging from the bottom of the chlorination kettle. The method provided by the invention has the advantages that: of using liquid ammonia as the refrigerant directly, eliminating the intermediate links in preparing the frozen calcium chloride aqueous solution, reducing the heat transfer loss, stabilizing the product yield, and eliminating the risk of brine leakage polluting the environment.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a production method of maltol, in particular to a heat exchange method of maltol chlorination reaction. Background technique [0002] Maltol is also called methyl maltol. White crystalline powder with the special aroma of caramel butterscotch. It is a broad-spectrum flavor synergist with the functions of increasing, fixing and sweetening. It can be used to prepare food flavors and cosmetic flavors. It is widely used in food , beverage, brewing, cosmetics, pharmaceutical and other industries. [0003] Judging from the market development in recent years, the application fields of maltol are constantly expanding, the consumption is also increasing, and the export volume is also showing an upward trend. In the production of maltol, the chlorination reaction is an instantaneous reaction process, ensuring the timely transfer of reaction heat and shortening the reaction time...

AI Technical Summary

Problems solved by technology

In production, calcium chloride aqueous solution is often used as a refrigerant for heat exchange. It is necessary to exchange heat with liquid ammonia for calcium chloride aqueous solution, and use liquid ammonia to gasify to absorb heat to produce calcium chloride cold brine, and then use calcium chloride to cool For salt water, the heat of chlorination reaction is taken away by the plate heat exchanger, the heat loss of multiple heat exchanges is large, and the efficiency is low, resulting in unstable product yield, heavy load on the ammonia compressor, and the need to increase investment in site equipment, as well as leakage of salt water risk of polluting the environment

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