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Method of continuously preparing urotropine mother liquid by means of coproduction with formaldehyde absorption column

A formaldehyde absorption tower and urotropine technology, which is applied in the field of continuous preparation of urotropine mother liquor by using formaldehyde absorption tower co-production, can solve the problem of reactor liquid level fluctuation and pressure pulsation, short production process route, incomplete reaction, etc. problems, to achieve the effects of huge economic and environmental protection and social benefits, flexible and convenient adjustment, and saving production costs

Pending Publication Date: 2018-07-27
呼图壁县锐源通化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gas-phase method of urotropine production process is short, especially when the device is ramped up, the gas velocity in the reactor is high and the reaction time is short, which is likely to cause incomplete reaction, the product purity is not high, and it will also cause fluctuations in the liquid level and pressure pulsation in the reactor. , the phenomenon of serious entrainment of gas mist

Method used

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  • Method of continuously preparing urotropine mother liquid by means of coproduction with formaldehyde absorption column
  • Method of continuously preparing urotropine mother liquid by means of coproduction with formaldehyde absorption column

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Embodiment 1

[0031] A method for continuously preparing urotropine mother liquor by co-production of formaldehyde absorption tower, the ammonia tail gas is introduced into the formaldehyde absorption tower, and the ammonia tail gas is processed, the specific steps are as follows:

[0032] (1) Meter the filtered ammonia gas and pass it into the distributor at the bottom of the formaldehyde absorption tower, and evenly disperse it in the desalted water to prepare an ammonia solution with a pH value of 8.0;

[0033] (2) The above-mentioned ammonia solution is circulated in the tower, and then gas formaldehyde is introduced, the tower temperature rises rapidly, the tower temperature is controlled at 75 ° C, the pH value is controlled at 8.5, and the reaction is carried out to form a mother liquor with a content of 25% urotropine;

[0034] (3) The mother liquor is metered into the ammoniation reactor of the urotropine plant, and the temperature of the ammoniation reactor is controlled at 85°C, t...

Embodiment 2

[0053] A method for continuously preparing urotropine mother liquor by co-production of formaldehyde absorption tower, the ammonia tail gas is introduced into the formaldehyde absorption tower, and the ammonia tail gas is processed, the specific steps are as follows:

[0054] (1) Measure the filtered ammonia gas and pass it into the distributor at the bottom of the formaldehyde absorption tower, and evenly disperse it in the desalted water to prepare an ammonia solution with a pH value of 9.0;

[0055] (2) The above-mentioned ammonia solution is circulated in the tower, and then the gas formaldehyde is introduced, the tower temperature rises rapidly, the tower temperature is controlled at 50°C, the pH value is controlled at 9.5, and the reaction is carried out to form a mother liquor with a content of 20% urotropine;

[0056] (3) The mother liquor is metered into the ammoniation reactor of the urotropine plant, and the temperature of the ammoniation reactor is controlled at 95°...

Embodiment 3

[0075] A method for continuously preparing urotropine mother liquor by co-production of formaldehyde absorption tower, the ammonia tail gas is introduced into the formaldehyde absorption tower, and the ammonia tail gas is processed, the specific steps are as follows:

[0076] (1) Meter the filtered ammonia gas and pass it into the distributor at the bottom of the formaldehyde absorption tower, and evenly disperse it in the desalted water to prepare an ammonia solution with a pH value of 7.5;

[0077] (2) The above-mentioned ammonia solution is circulated in the tower, and then gas formaldehyde is introduced, the tower temperature rises rapidly, the tower temperature is controlled at 85°C, the pH value is controlled at 8.0, and the reaction is carried out to form a mother liquor with a content of 35% urotropine;

[0078] (3) The mother liquor is metered into the ammoniation reactor of the urotropine plant, and the temperature of the ammoniation reactor is controlled at 75°C, the...

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Abstract

The invention discloses a method of continuously preparing an urotropine mother liquid by means of coproduction with a formaldehyde absorption column. In the method, ammonia tail gas is fed into the formaldehyde absorption column in order to treat the ammonia tail gas. The method particularly includes the steps of: 1) feeding filtered ammonia gas into the formaldehyde absorption column to prepareammonia water solution; 2) performing column circulation to the ammonia water solution and feeding formaldehyde gas, so that temperature of the column is rapidly increased to perform a reaction to obtain the urotropine mother liquid, of which the content is 20-35%; 3) metering the mother liquid and feeding the urotropine mother liquid into an ammoniation reactor of an urotropine apparatus, temperature, pH value and vacuum degree being controlled; 4) performing continuous concentration or intermittent concentration in the ammoniation reactor until the concentration of the mother liquid is 38-42%, and discharging the mother liquid to a mother liquid crystallizing trough. By means of the method, chemical reaction absorption is carried out with the circulating pump in the formaldehyde absorption column without increase of any power cost. The method has high efficiency and is flexible and convenient to adjust, can reduce reaction heat in the reactor and save circulating water, and satisfiesindustrial policy of saving energy, reducing consumption and protecting environment in our country.

Description

technical field [0001] The invention relates to the technical field of industrial tail gas recovery, in particular to a method for continuously preparing urotropine mother liquor by using a formaldehyde absorption tower for co-production. Background technique [0002] In the current domestic gas-phase method of urotropine production process, the traditional gas-phase method of urotropine production process is formed by condensation of gaseous formaldehyde and ammonia in an alkaline solution (see the specific flow chart figure 1 ). In the actual production process, the existing gas-phase method for the production of hexatropine is to directly feed the formaldehyde gas generated after the conversion of methanol into the ammoniation reactor and react with ammonia to form the mother liquor of hexatropine. However, the gas-phase method of urotropine production process is short, especially when the device is ramped up, the gas velocity in the reactor is high and the reaction time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D487/18B01D53/78B01D53/58
CPCB01D53/58B01D53/78C07D487/18Y02P20/10
Inventor 郭艳伟刘国辉孙波
Owner 呼图壁县锐源通化工有限责任公司
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