Methyl mercaptan purification device

Abstract

The invention discloses a methyl mercaptan purification device which comprises a multi-stage condenser, an extraction tower, a coalescer, a degassing tower, a methyl mercaptan rectifying tower, a dimethyl sulfide rectifying tower, a wastewater rectifying tower and a dimethyl sulfide conversion reactor. The multistage condenser is connected with the methyl mercaptan synthesis reactor, a lower gas phase outlet is connected with the synthesis tail gas condenser, a bottom liquid phase outlet is connected with the lower part of the extraction tower, the extraction tower is connected with the coalescer and the condenser, a bottom discharge hole is connected with the middle part of the wastewater rectifying tower, the coalescer is connected with the extraction tower, the degassing tower and the methyl mercaptan rectifying tower, a top outlet of the methyl mercaptan rectifying tower is connected with the mercaptan storage tank, a bottom outlet is connected with a middle feed port of the dimethyl sulfide rectifying tower, the dimethyl sulfide rectifying tower is connected with the dimethyl sulfide conversion reactor, and a top outlet of the wastewater rectifying tower is connected with a tail gas washer. The device is reasonable in technological process, high in product methyl mercaptan purity, low in operation energy consumption and sufficient in dimethyl sulfide utilization, and is anideal methyl mercaptan purification device.

Description

technical field [0001] The invention belongs to the field of separation and purification, in particular to a methyl mercaptan purification device. Background technique [0002] Methyl mercaptan belongs to the smallest relative molecular weight among organic mercaptans. It is very active and easily reacts with other substances to form sulfur-containing substances. Therefore, methyl mercaptan has a wide range of uses and is the main raw material for the synthesis of pesticides, medicines, food and synthetic materials. [0003] CN 1186067A discloses a separation method for catalytically synthesizing methyl mercaptan product gas mixture. Washing methanol and synthesis gas condensate first passes through a stripping tower to remove hydrogen sulfide, and then passes through a pre-separation tower to extract a fine tower and a pure product tower to obtain about 98 % of methyl mercaptan. This method washes methanol together with syngas condensate to dehydrogenate 2 S (all componen...

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Problems solved by technology

[0004] CN102659648A discloses a method for separating a mixed liquid containing methyl sulfide and methyl mercaptan, which can only obtain high-purity methyl sulfide (above 99.5%), because the boiling point of methanol and methyl mercaptan azeotrope is different from that of methyl mercaptan The boiling point of mercaptan is basically the same, and there is no extraction process, methanol and methyl mercaptan cannot be separated, and only methyl mercaptan with a content of about 80% can be obtained

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