Low-conversion-rate high-yield formaldehyde production technology and device thereof

Abstract

The invention relates to the field of formaldehyde production technology, in particular to a low-conversion-rate high-yield formaldehyde production technology and device thereof. Reaction of ternary mixture with excessive methanol under action of catalyst is completed by controlling proportion of methanol in the ternary mixture, generated formaldehyde gas and other gases are cooled suddenly and fed into a primary absorption tower to be absorbed through process water, methanol-contained formaldehyde solution acquired from the primary absorption tower enters a first methanol removing device to be heated, methanol is removed in a gaseous state, the formaldehyde solution with methanol removed is used as finished formaldehyde products to be stored, the gaseous methanol removed by the first methanol removing device still contains formaldehyde in a small quantity so as to be fed into a secondary absorption tower to be absorbed and enter a second methanol removing device for removing methanol again, and the removed gaseous methanol enters a flame-retardant filter to enter a formaldehyde production system again for recycling reaction. The low-conversion-rate high-yield formaldehyde production technology has the advantages of low conversion rate, fewer negative reactions, low oxygen temperature control, long lifetime of catalyst, high yield and low material consumption.

Description

technical field [0001] The invention relates to the field of formaldehyde production technology, in particular to a formaldehyde production technology with low conversion rate and high yield and a device thereof. Background technique [0002] At present, after more than 50 years of ups and downs in the production of silver-based formaldehyde in China, great achievements have been made in all aspects. The energy consumption has changed from the gas consumption type to the external gas supply type, and the material consumption has changed from 500kg methanol / T 37% formaldehyde to the current 445kg methanol / T T 37% formaldehyde, the production capacity has grown from hundreds of thousands of tons to more than 20 million tons today, and the production capacity and technology of silver method have been in the leading position in the world. Formaldehyde production has developed from extensive to refined production, from simple to professional development, and the research on techn...

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Problems solved by technology

It is impossible to improve the conversion rate while r

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