Sodium methoxide and dimethyl ether combined production technology

Abstract

The invention relates to a sodium methoxide and dimethyl ether combined production technology, which comprises the following steps: a raw material methanol is introduced in a methanol vaporization tower for vaporization, the vaporized methanol in introduced in a synthetic tower, sodium hydroxide and methanol in the synthetic tower are reacted to obtain reaction products containing sodium methoxide, methanol steam and water, sodium methoxide is discharged from the bottom of the synthetic tower and then collected, the aqueous methanol steam is introduce4d in a dimethyl ether reactor, after dehydration reaction, dimethyl ether is extracted from upper side line of a dimethyl ether rectifying tower, methanol and water are introduced in a methanol rectifying tower, and the rectified methanol is recovered and utilized in the methanol vaporization tower. According to the invention, a dimethyl ether production apparatus is used for producing a lot of absolute methanol steam, the absolute methanol steam is introduced in a sodium methoxide synthesis reaction tower, sodium methoxide is generated at bottom of the tower, and the aqueous methanol steam from the tower top is send to the dimethyl ether reactor for producing dimethyl ether. The technology effectively use the heat released through sodium methoxide generation reaction by methanol, energy consumption and equipment investment are reduced, and the dimethyl ether and sodium methoxide production cost can be reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, more specifically, the invention relates to a co-production process for preparing sodium methoxide and dimethyl ether with methanol as raw material. Background technique [0002] Sodium methoxide is an important organic synthesis intermediate, widely used in medicine, chemical industry, pesticide, fuel and other industries. [0003] The preparation method of sodium methylate is to adopt sodium hydroxide and methanol reaction dehydration to generate sodium methylate, and its reaction equation is as follows: [0004] NaOH+CH 3 OH→CH 3 ONa+H 2 o [0005] The reaction is exothermic and reversible, and sodium methoxide will decompose into sodium hydroxide and methanol when it meets water. Therefore, how to remove the water produced by the reaction is the key technology. In the traditional industry, a large amount of anhydrous methanol vapor is introduced at the bottom of the reaction synthesis t...

AI Technical Summary

Problems solved by technology

Because the recovered methanol is evaporated from the top of the methanol pressurized rectification tower and then condensed, and requires a certain reflux ratio, which consumes a lot of heat energy; and the recovered methanol is in the liquid phase, and it needs to be heated when it is returned as a raw material Vaporization also consumes a lot of heat energy

Therefore, this method consumes a lot of energy

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