A kind of method that reclaims dimethyl sulfate from vacuum

Abstract

The present invention provides a method of recovering dimethyl sulfate from vacuum gas. The method of recovering dimethyl sulfate from vacuum gas comprises the following steps: step 1, providing a device for recovering dimethyl sulfate; step 2, opening a frozen brine ingress and egress orifice of a vacuum buffer tank, causing the temperature of the vacuum buffer tank to be below 0 DEG C; step 3, turning on a vacuum pump, and when the vacuum in a primary balance barrel reaches -0.1 MPa, opening a valve connected between the primary balance barrel and the vacuum buffer tank, and opening a valveconnected between the vacuum buffer tank and a receiving tank; step 4, opening a steam inlet valve and a drain valve of a rectifying kettle, and extracting dimethyl sulfate in the vacuum gas by meansof the vacuum buffer tank. The method of recovering dimethyl sulfate from vacuum gas provided in the present invention has the advantages of effectively reduced gas flow rate of gas, prolonged gas retention time, high refining and recycling efficiency of dimethyl sulfate, and no wastewater pollution.

Description

technical field [0001] The invention relates to the technical field of the method for reclaiming dimethyl sulfate, in particular to a method for reclaiming dimethyl sulfate from vacuum. Background technique [0002] Dimethyl sulfate is one of the important chemical raw materials. It is widely used in medicine, military industry, spices, rubber and other industries in organic synthesis. At present, the vacuum method is used to refine and purify the product during the rectification process of dimethyl sulfate. . [0003] However, in the traditional dimethyl sulfate rectification and extraction process, under the vacuum condition of -0.1MPa, as the temperature of the rectification kettle gradually increases from normal temperature to above 100°C, part of the incompletely condensed dimethyl sulfate gas phase is accompanied by The vacuum gas is pumped into the vacuum pool together, resulting in a waste of materials and reducing the recovery rate of dimethyl sulfate. The dimethyl...

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Problems solved by technology

[0003] However, in the traditional dimethyl sulfate rectification and extraction process, under the vacuum condition of -0.1MPa, as the temperature of the rectification kettle gradually increases from normal temperature to above 100°C, part of the incompletely condensed dimethyl sulfate gas phase is accompanied by The vacuum gas is pumped into the vacuum pool together, resulting in a waste of materials and reducing the recovery rate of dimethyl sulfate. The dimethyl sulfate brought into the vacuum pool by the vacuum air is hydrolyzed to generate methanol and sulfuric acid, resulting in a vacuum pool It is necessary to continuously add alkaline substances for neutralization treatment, and the production of alcohols increases the difficulty of sewage treatment

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