Deacidification method of methane chloride

The invention discloses a deacidification method of methane chloride. A packed tower is adopted as a deacidification tower, methanol is adopted as a deacidification agent, and a fractional condenser is additionally arranged behind the deacidification tower, so that the deacidification tower becomes a multi-stage separator, the deacidification efficiency is improved, the water content in the treated synthesis gas is greatly reduced, fresh water supplementation and subsequent alkali washing equipment and dehydration drying equipment in a traditional deacidification process are not needed, the occupied area of the equipment is reduced, the consumption of concentrated sulfuric acid during subsequent dimethyl ether removal is reduced, and the dilute acid amount of tower bottom discharge is also reduced. 本发明公开了一种一氯甲烷合成气的脱酸工艺，采用填料塔为脱酸塔，甲醇为脱酸剂，通过在脱酸塔后增加分凝器，使得脱酸塔成为多级分离器，提高了脱酸效率，并极大的降低了处理后的合成气中的水含量，不需要传统脱酸工艺中的补加新鲜水，以及后续碱洗设备和脱水干燥设备，降低了设备的占地面积，减少了后续脱除二甲醚时浓硫酸的消耗，也降低了塔底排出物的稀酸量。