Process for drying water and dimethyl ether by sulfuric acid without producing dilute sulphuric acid and dimethyl ester

Abstract

The invention discloses a process for drying water and dimethyl ether by sulfuric acid without producing dilute sulphuric acid and dimethyl ester, which comprises a sulfuric acid drying tower and a hydrolysis light component removing tower. The bottom of the sulfuric acid drying tower is connected with the middle of a vacuum rectifying tower. The hydrolysis light component removing tower consists of an upper hydrolysis tower and a lower hydrolysis tower. The top of the vacuum rectifying tower is connected with the upper hydrolysis tower through a return tank. A concentrated sulfuric acid outlet in the bottom of the lower hydrolysis tower is connected with the upper end of a concentrated sulfuric acid drying tower. The device is simple in structure and unique in design, and realizes efficient concentrated sulfuric acid circulating drying. Concentrated sulfuric acid is operated at high concentration, and the drying effect is improved. A traditional two-tower or three-tower sulfuric acid drying system is replaced, the number of drying machines is reduced, and the occupied area is reduced. Meanwhile, cost and investment are reduced, cyclic utilization of concentrated sulfuric acid is achieved, the generation of dilute sulfuric acid and dimethyl sulfate which are difficult to treat are avoided, the drying efficiency is higher, cost is saved, and the process is safe and environment friendly.

Description

technical field [0001] The invention relates to a technique for drying water and dimethyl ether with sulfuric acid without producing dilute sulfuric acid and dimethyl ester. Background technique [0002] At present, the use of concentrated sulfuric acid is more and more extensive, and it is one of the commonly used chemical raw materials. The drying of concentrated sulfuric acid is a crucial step in its production process, which directly affects the quality of methyl chloride synthesis and production. The existing concentrated sulfuric acid The cycle drying process mostly adopts the concentrated sulfuric acid drying method with two towers or three towers, which makes the process of concentrated sulfuric acid cycle drying cumbersome and low in efficiency, which greatly increases the production cost, and many small manufacturers do not increase the processing equipment at all, and directly convert the production process The exhaust gas and dust in the air are discharged into t...

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Problems solved by technology

[0002] At present, the use of concentrated sulfuric acid is more and more extensive, and it is one of the commonly used chemical raw materials. The drying of concentrated sulfuric acid is a crucial step in its production process, which directly affects the quality of methyl chloride synthesis and production. The existing concentrated sulfuric acid The cycle drying process mostly adopts the concentrated sulfuric acid drying method with two towers or three towers, which makes the process of concentrated sulfuric acid cycle drying cumbersome and low in efficiency, which greatly increases the production cost, and many small manufacturers do not increase the processing equipment at all, and directly convert the production process Exhaust gas and dust in the air are discharged into the atmosphere, causing serious environmental pollution

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