Method for recovering methanol gas generated in Vc-Na methanol solution centrifuging process realized by using siphonic centrifuge

Abstract

The invention provides a method for recovering methanol gas generated in a Vc-Na methanol solution centrifuging process realized by using a siphonic centrifuge. The method comprises the steps of separating and absorbing methanol gas three times, wherein the methanol gas is generated in the Vc-Na centrifuging process; sufficiently recovering the methanol gas, and repeatedly utilizing the methanol gas to thoroughly improve the air quality of a working region.

Description

technical field [0001] The invention relates to the recovery field of chemical production, in particular to a method for recovering methanol gas produced by a siphon centrifuge when centrifuging a Vc-Na methanol solution. Background technique [0002] Vitamin C is an essential nutrient for animals. At present, the production process of vitamin C in my country mainly consists of four steps: fermentation, extraction, transesterification and refining. In the process of preparing the intermediate VC-Na, methanol is used as the main reaction solvent and Washing solvent, because methanol is volatile, the loss of methanol is unavoidable during production. [0003] At present, the siphon centrifuge will produce some methanol gas during the centrifugation of the Vc-Na methanol solution, and the methanol gas will enter the mother liquor storage tank with the centrifuged mother liquor, and then float into the surrounding environment, and some parts of the centrifuge will also leak P...

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Problems solved by technology

[0003] At present, the siphon centrifuge will produce some methanol gas during the centrifugation of the Vc-Na methanol solution, and the methanol gas will enter the mother liquor storage tank with the centrifuged mother liquor, and then float into the surrounding environment, and some parts of the centrifuge will also leak Part of the methanol gas is released, so that the air in the operating area of ​​the siphon machine will be filled with a lot of methanol gas, which seriously affects the air quality in the operating area and increases the safety risk of production in the production area. At the same time, insufficient recovery of methanol in the air is also a problem. big waste

Patent CN2010105543966 discloses a methanol recovery process. After the collected methanol is sent to the absorption tower to be absorbed by the liquid absorbent, the absorbent enriched liquid containing methanol is sent to the desorption tower for analysis. The disadvantage is that the methanol absorption is insufficient, and The specific collection method of methanol gas is not detailed in the patent; patent CN201110060160.1 discloses a gas phase methanol recovery process, which is suitable for the field of biodiesel manufacturing, but not suitable for the field of vitamin C production

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