Method for solvent self-heating separation in acesulfame potassium synthesis

Abstract

The invention discloses a method for solvent self-heating separation in acesulfame potassium synthesis. The method includes the following steps of pumping solid potassium hydroxide and water of the conventional adding percents into a reactor to make potassium hydroxide and water dissolved in a neutralization kettle and release heat till the temperature is naturally raised to 60 DEG C, starting a vacuum pump connected with the neutralization kettle to vacuumize the neutralization kettle to the negative pressure of -0.4 MPa, pumping an organic phase of the conventional adding percent into the reactor to make the temperature in the kettle naturally decrease and then increase, starting the vacuum pump to conduct vacuumization till a condenser valve when the temperature of the kettle is raised to 50 DEG C, starting the condenser brine valve, controlling the temperature of the kettle at 45 DEG C by controlling the feeding ratio of the organic phase to sodium carbonate, and discharging condensed dichloromethane to a solvent collecting tank through a condenser. The method has the advantages that solvent is pressurized in the reactor and depressurized after getting out of the reactor, the boiling point of the solvent is reduced, original processes of separating, washing, separating, pre-boiling and the like are omitted through temperature control, operation is simplified, labor intensity is reduced, machines and pumps are less used, and meanwhile lots of steam is saved.

Description

technical field [0001] The invention relates to the field of acesulfame K synthesis technology, in particular to an autothermal separation method in the neutralization reaction of acesulfame K synthesis. Background technique [0002] At present, in the synthetic production process of acesulfame potassium, such as figure 1 As shown, the process of neutralizing the separation stage of dichloromethane is complicated. The original dichloromethane and sugar-water mixture should be separated by static layering, then transferred to the organic phase tank, washed with water, and then statically layered and separated after washing. , and then enter rough steaming to be used for rectification. In this process, not only a large amount of equipment needs to be added, but also a large amount of heat energy loss in the early stage of production needs to be taken away by brine, and a large amount of steam needs to be consumed by heating in the later stage, resulting in low energy utilizati...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a solvent autothermal separation method in the synthesis of acesulfame potassium in view of the disadvantages of complicated process, many post operation steps, large-scale use of mechanical pumps and large steam consumption in the prior art separation technology

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