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A kind of concentrated formaldehyde production process

A production process and technology for concentrated formaldehyde, which can be used in organic chemistry, separation/purification of carbonyl compounds, preparation of organic compounds, etc., and can solve the problems of long-term continuous supply and unstable quality of concentrated formaldehyde products.

Active Publication Date: 2020-12-11
KAIFENG LONGYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the quality of concentrated formaldehyde products is unstable in the production process and cannot be continuously supplied for a long time, the present invention has invented a production process of concentrated formaldehyde after exploration

Method used

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  • A kind of concentrated formaldehyde production process

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Experimental program
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Effect test

Embodiment 1

[0026] A kind of concentrated formaldehyde production technique, comprises the steps:

[0027] (1) The refined methanol heated by the heater 9, the crude methanol from the methanol recovery tower, the waste gas from the top of the formaldehyde absorption tower, fresh air and steam respectively enter the mixer 1 through their own pressure for uniform mixing to obtain a mixed gas;

[0028] (2) The uniformly mixed mixed gas enters the formaldehyde reactor 2, and under the catalysis of the silver catalyst, the oxidation reaction of methanol is carried out at 600-650°C to obtain the reaction gas;

[0029] (3) The reaction gas enters the formaldehyde absorption tower 3, and the formaldehyde in the reaction gas is absorbed by the desalted water sprayed on the top of the tower, and the waste gas that is not absorbed is discharged from the top of the formaldehyde absorption tower 3 and returned to the mixer 1 for reuse , the crude aldehyde is extracted from the bottom of the formaldehy...

Embodiment 2

[0040] A kind of concentrated formaldehyde production technique, comprises the steps:

[0041] (1) The refined methanol heated by the heater, the crude methanol from the methanol recovery tower, and the waste gas, air and steam from the top of the formaldehyde absorption tower respectively enter the mixer through their own pressure for uniform mixing to obtain a mixed gas; the temperature of the mixed gas 120°C, the volume ratio of the mixed gas is: air / methanol=0.35, steam / methanol=0.45, waste gas / methanol=1.40;

[0042] (2) The uniformly mixed mixed gas enters the formaldehyde reactor, and under the catalysis of the silver catalyst, the oxidation reaction of methanol is carried out at 600 ° C to obtain the reaction gas;

[0043](3) The reaction gas enters the formaldehyde absorption tower, and the formaldehyde in the reaction gas is absorbed by the desalted water sprayed on the top of the formaldehyde absorption tower, and the waste gas that is not absorbed is discharged fro...

Embodiment 3

[0047] A kind of concentrated formaldehyde production technique, comprises the steps:

[0048] (1) The refined methanol heated by the heater, the crude methanol from the methanol recovery tower, and the waste gas, air and steam from the top of the formaldehyde absorption tower respectively enter the mixer through their own pressure for uniform mixing to obtain a mixed gas; the temperature of the mixed gas The temperature is 122°C, the volume ratio of the mixed gas is: air / methanol=0.36, steam / methanol=0.46, waste gas / methanol=1.41;

[0049] (2) The uniformly mixed mixed gas first passes through the flame arrester and then enters the formaldehyde reactor. Under the catalysis of the silver catalyst, the oxidation reaction of methanol is carried out at 610°C to obtain the reaction gas;

[0050] (3) The reaction gas enters the formaldehyde absorption tower, and the formaldehyde in the reaction gas is absorbed by the desalted water sprayed on the top of the formaldehyde absorption ...

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Abstract

The invention discloses a concentrated formaldehyde production technology. The technology comprises the steps as follows: (1) refined methanol heated by a heater, crude methanol from a methanol recovery tower, waste gas from the top of a formaldehyde absorption tower as well as fresh air and steam enter a mixer under own pressure to be uniformly mixed, and mixed gas is obtained; (2) the uniformly mixed gas enters a formaldehyde reactor to be subjected to an oxidation reaction of methanol, and reaction gas is obtained; (3) the reaction gas enters the formaldehyde absorption tower, crude formaldehyde is extracted from the bottom of the formaldehyde absorption tower and sent to a formaldehyde concentrator, and concentrated formaldehyde is prepared; (4) a material discharged from the bottom of the formaldehyde concentrator is a concentrated formaldehyde solution with the mass fraction of formaldehyde larger than 60%. With the adoption of the concentrated formaldehyde production technology, the quality of concentrated formaldehyde is guaranteed effectively for a long time, the energy consumption of a production device is reduced, the system operation reliability is improved, the user production continuity is stabilized, and the technology has great significance for the whole production system.

Description

technical field [0001] The invention belongs to the technical field of chemical product production, and in particular relates to a production process of concentrated formaldehyde. Background technique [0002] In the production process of concentrated formaldehyde, due to the prolongation of the reaction time of the formaldehyde reactor, there will be catalyst hardening, impurities causing catalyst poisoning and other phenomena, which will cause a decrease in catalytic efficiency, a decrease in methanol conversion rate, and an increase in methanol content in concentrated aldehyde. Affect the use of concentrated aldehyde users. [0003] The existing concentrated formaldehyde production process is long, energy consumption is high, operation adjustment is not flexible enough, the dealcoholization tower has high operating load, short operating cycle, long-term operation of the vacuum system is easy to block, and frequent load reduction is required, which affects the continuous a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/38C07C45/81C07C45/82C07C47/055
CPCC07C45/38C07C45/81C07C45/82C07C47/04
Inventor 李武斌吴保章韩元培何晓勇冷栋云宁晓泰李琦王保顺何志强陈宗元桑彦伟王彦辉王晓明刘继亮潘景福
Owner KAIFENG LONGYU CHEM
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