Energy-saving formaldehyde production system

Abstract

The invention relates to an energy-saving formaldehyde production system which comprises an evaporator, a gas mixer, an oxidizing reaction tower, a steam separation tower, an adsorption tower and a tail gas recycling device. The evaporator is connected with the gas mixer, the gas mixer is connected with a steam source, an outlet of the gas mixer is connected with a steam inlet of the oxidizing reaction tower, and a steam outlet of the oxidizing reaction tower is connected with a steam inlet of the steam separation tower. A steam exhaust port of the steam separation tower is connected with an inlet of the adsorption tower, a tail exhaust port of the adsorption tower is connected with a tail gas recycling device, and the steam separation tower comprises a tower body. The upper portion in the tower body is provided with at least one piece of metal regular filler through a frame, a liquid suction disc is arranged on the lower portion of the metal regular filler, and a water circulating cooling pond is arranged on the lower portion of the liquid suction disc. A large amount of steam in a formaldehyde gas mixture can be effectively removed through the steam separation tower, and therefore the mass concentration of produced formaldehyde products can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of formaldehyde production, and in particular relates to a formaldehyde energy-saving production system. Background technique [0002] Formaldehyde is an important basic organic chemical raw material and is widely used in the chemical industry. This year, my country's annual formaldehyde production has exceeded 10 million tons. In the prior art, the most commonly used method is to oxidize methanol to formaldehyde using the silver method. In the process of producing formaldehyde by the traditional silver method, water vapor is added to lower the temperature. Although the added water vapor does not participate in the reaction, it will cause a large amount of water vapor in the formed formaldehyde gas, which will be released from the oxidation furnace together with the formaldehyde gas generated by the reaction. directly into the No. 1 absorption tower. In the process of absorbing formaldehyde gas in the No....

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Problems solved by technology

In the process of absorbing formaldehyde gas in the No. 1 absorption tower, the water vapor is cooled to form liquid water. Since the water vapor will release a large amount of heat during the cooling process, the tower temperature of the absorption tower will also rise accordingly, resulting in poor absorption effect. Well, it also increases the load of the first absorption tower: In addition, the water vapor remains in the first absorption tower after being cooled to water, so that the concentration of the formaldehyde solution cannot be increased.

Therefore, the concentration of formaldehyde products produced by the traditional silver method is relatively low, and the unit consumption of methanol is high

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