Preparation method of electronic-grade high-purity acetone

Abstract

The invention discloses a preparation method of electronic-grade high-purity acetone. The preparation method comprises the following steps: (1) removing boron ions by complexing precipitation; (2) dehydrating by a molecular sieve; (3) carrying out double-tower rectification through a low-boiling-point tower and a high-boiling-point tower in sequence; and (4) conveying the rectified acetone to a hundred-grade purification room for precise filtration to obtain a finished product. The complex precipitation method is adopted to remove the boron ions, the operation is simple, the cost is low, the effect is obvious, the treated boron ions are reduced from the ppm level of the raw material to 100 ppt or below, and then the boron ions are controlled to be 80 ppt or below through double-tower rectification. The purity of acetone is improved to 99.99% or above, anions are reduced to 1ppb or below, boron ions are reduced to 80ppt or below, other cations are reduced to 10ppt or below, moisture is reduced to 50ppm or below, particles larger than 0.03 microns are reduced to 800 / ml or below, the overall index reaches the G5 standard, and the requirements of the semiconductor field can be met.

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