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Waste methanol recycling method

A technology for waste methanol and formaldehyde, applied in the chemical industry, can solve the problems of increased raw material consumption, decreased raw material conversion rate and product quality, decreased catalyst activity, etc., and achieves the effect of prolonging the use of orders.

Inactive Publication Date: 2013-12-11
GUANGXI SUNWAY FOREST PROD IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for recycling waste methanol, which can solve the problem that the catalyst activity in the production of formaldehyde is affected by the high content of methanol impurities, resulting in a decline in the conversion rate of raw materials and product quality, and an increase in raw material consumption.

Method used

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Embodiment 1

[0016] When shutting down each time, the waste methanol in the evaporator is discharged into the methanol storage tank, and then injected into the evaporator 1 of the distillation equipment; steam is input to the heating coil 2 of the evaporator, and the evaporation temperature is controlled within 6-8°C, and the distillation The amount is 80kg / h, and the waste methanol is heated and evaporated in the evaporator 1 to form clean methanol vapor; the methanol vapor enters the condenser 3 through the delivery pipe 5, and is condensed in the condenser 3 to separate clean liquid methanol and residue After being evaporated, the clean liquid methanol is sent into the methanol collection barrel 4 through the delivery pipe 5 .

Embodiment 2

[0018] Use pipes to connect the waste methanol injection pipe of the distillation equipment with the drain pipe at the bottom of the evaporator, open the drain valve of the evaporator, and use the pressure in the evaporator of the production process to press a small amount of waste methanol into the evaporator 1 of the distillation equipment. The flow rate is controlled as 80kg / h; steam is input to the heating coil 2 of the evaporator 1, and the evaporation temperature is controlled within 68°C. The waste methanol is heated and evaporated in the evaporator 1 to form clean methanol vapor, and the distillation volume is 80kg / h; Enter the condenser 3 through the delivery pipe 5, condense in the condenser 3, and the clean liquid methanol obtained flows into the raw methanol tank 12 through the pipeline 6, and is used as a raw material for formaldehyde production.

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Abstract

The invention discloses a waste methanol recycling method and relates to the technical field of chemical engineering. The waste methanol recycling method comprises the following steps of: collecting the waste methanol and putting the collected waste methanol in an evaporator in distillation equipment, and suppling steam to the steam heating coil of the container, wherein the evaporation temperature is lower than or equal to 68 DEG C and the distillation amount is 80 kg / h; heating the waste methanol in the evaporator so that the waste methanol is evaporated to form a gaseous-phase material, feeding the gaseous-phase material into a condenser and condensing the gaseous-phase material in the condenser to separating out clean liquid methanol; finally, evaporating the residues and feeding the clean liquid methanol into a collecting barrel. The waste methanol recycling method is capable of solving the problems of the reduction of the raw material conversion rate and the product quality and the increase of raw material consumption caused by the reduction of catalyst activity in methanol production due to high impurity content of the methanol.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for recycling waste methanol produced during the production of formaldehyde. Background technique [0002] Such as figure 1 As shown, the raw materials for formaldehyde production include methanol and air. In the raw material preparation stage of formaldehyde production, the ratio of methanol to air is prepared. This process is carried out in the evaporator 11, and liquid methanol passes through the methanol from the methanol tank 12 at a certain flow rate. The pump 13 enters the evaporating pot 11 to control a certain liquid level and temperature; the methanol is heated and vaporized into methanol gas by the heating pipe 16 in the evaporating pot 11; The liquid is mixed with methanol vapor and drawn out from the outlet to complete the preparation of raw materials. During the preparation process of methanol and air, the air, methanol and impurities carried by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/76
Inventor 冼育章廖素玲龙国辉
Owner GUANGXI SUNWAY FOREST PROD IND
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