Acetonitrile purification process for ultrahigh performance liquid chromatography-mass spectrometer

An acetonitrile purification process, comprising the following steps:

• oxidation:
• feeding industrial acetonitrile into a reaction kettle through a raw material pump, adding a catalyst in the reaction kettle, heating the reaction kettle after reacting for 1 to 6 h under the conditions of 80 to 90° C. and 10 to 90 kPa, and condensing the obtained gas by a condenser to enter an intermediate buffer tank to obtain an oxidized material;
• adsorption:
• feeding the oxidized material into an adsorption column through a feeding pump and a flowmeter sequentially, and performing adsorption at a flow velocity of 0.01 to 2 m/s to obtain an absorbed material;
• wherein the adsorption column comprises an online adsorption column and a regenerative activation column which are connected in parallel;
• rectification:
• feeding the adsorbed material into a rectifying kettle, adding a drying agent into the rectifying kettle, heating the rectifying tower after reacting at 80 to 90° C. for 1 to 5 h, feeding gas generated in the rectifying tower into a rectifying tower to perform reflux for 2 to 10 h, extracting a tower top gas of the rectifying tower, removing the initially extracted reflux fluid of 1 to 5 h, and the rest of the reflux fluid being sequentially pass through a reflux condenser and a reflux tank, and feeding the obtained reflux fluid into a finished product tank to obtain a semi-finished product;
• wherein the flow of the reflux is 1 to 100 kg/h;
• the extracted flow is 1-30 kg/h, and the extracted reflux ratio is (1-2):1;
• and
• filtration:
• filtering the semi-finished product to obtain acetonitrile for an ultrahigh performance liquid chromatography-mass spectrometer,
• wherein the regenerative activation columns and the online adsorption columns have the same quantity, and there is 1, 2, 3, 4, or 5 online adsorption columns.