Do you know Formaldehyde Production Process?

The Formaldehyde Production Process is: sending methanol to the gasifier with a pump, the methanol is vaporized by heating the vapor coil of the gasifier, the vaporized methanol and air mixture flows out from the top of the gasifier, and water vapor is added to make the methanol The ratio of air and water vapor is 1: 1.8 ～ 2.0: 0.8 ～ 1.0 (φ). This mixed gas passes through the heater and flame arrester and enters the oxidation reactor at the temperature of 115 ～ 120 ℃. The oxidation reaction is at 600 ～ 650 ℃, 0.3 ～ 0.5MPa. The thickness of the silver catalyst bed in the reactor is generally 10-50mm, and the service life is 3-8 months. The reactor is a tube-type, the material is stainless steel, the reaction heat is carried out in the form of steam, and the single-pass methanol conversion rate is 60%. ~ 85%, the selectivity of formaldehyde is 91% ~ 93%, the methanol decomposition rate is 7% ~ 8%, and carbon dioxide, carbon monoxide and methane are generated at the same time. After the material exiting the oxidation reactor is rapidly cooled to 80-85 ° C, it enters the bottom of the absorption tower, and the process water enters from the top of the tower. After absorption, about 37% of the formaldehyde solution is sent to the formaldehyde distillation tower, and the distilled methanol is circulated to the gasifier. After the bottom material is treated with anion exchange resin, a product containing 55% formaldehyde and less than 1% methanol is obtained.

Formaldehyde Production Plant

As a Formaldehyde Production Plant, I would like to tell you that the current level of production of silver formaldehyde plants in China is not far behind the advanced foreign production levels, especially the large-scale formaldehyde plants constructed in recent years. Qualified products within hours. After driving for a period of time, according to statistical data, the unit consumption reached below 0.455, the alcohol content was about 1%, and the acidity was 0.01%; the energy consumption was 25-27Kw / t, and the investment cost was low. Of course, to achieve the above objectives, it is necessary to integrate factors that are not conducive to production, formulate reasonable process conditions, select equipment that meets the process conditions, implement a management system, create a good production environment, and overcome as much as possible on the process and equipment. There are problems in order to obtain satisfactory results.

The consumption of raw material formaldehyde is an important technical and economic indicator. It accounts for 80% of the cost. The average unit consumption in the industry has dropped from 475Kg / t to the current 460Kg / t, and many companies have a unit consumption of 455-445Kg / t.

1. When purging and igniting, the catalyst surface temperature should be high. The general formaldehyde operation process stipulates that the overheating temperature during purging and ignition is higher than 100 ℃. Due to the heat loss of the pipeline from the superheater to the reactor, the actual temperature of the raw material vapor to the catalyst surface is very low, which causes methanol to be condensed and adsorbed on the catalyst surface during purging. During ignition, the actual oxygen and alcohol on the adsorption surface is relatively low, and the combustion is incomplete, forming carbon deposits. Affects catalyst activity. Therefore, the insulation of the equipment must be intact, and the waste heat boiler must be preheated and maintained under pressure before starting to keep the catalyst temperature above 80 ° C when the catalyst is ignited. It is also equipped with a suitable igniter heating power, so that the formaldehyde production is in a better oxygen-to-alcohol ratio when ignited, and there is a good external condition to match it.

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