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Depolymerization method of formaldehyde containing paraformaldehyde dust

A technology for paraformaldehyde and formaldehyde, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve the problems of high energy consumption, poor efficiency, and environmental pollution in steps, and achieves simple steps and convenient use. , the effect of saving energy

Pending Publication Date: 2019-09-20
衡水市银河化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Light formaldehyde containing paraformaldehyde dust will be used in the production of urotropine. The formaldehyde in this substance is a carcinogenic and environmentally polluting product. The current method of removing formaldehyde has high energy consumption and poor efficiency.

Method used

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  • Depolymerization method of formaldehyde containing paraformaldehyde dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. A depolymerization method containing paraformaldehyde dust formaldehyde is characterized in that, comprises the following steps:

[0017] 1) Add light formaldehyde containing dust into the liquid storage tank, the addition amount is 3.5m³;

[0018] 2) Pass steam to the heater connected to the liquid storage tank to heat the light formaldehyde. The steam pressure is controlled at 0.3MP. ℃ and keep warm;

[0019] 3) After keeping warm for 1 hour, the formaldehyde solution in the liquid storage tank gradually changed from turbid to transparent. Observe the depolymerization situation in the liquid storage tank through the sight glass. When the solution is transparent, take a sample of 200 ml and put it in the Erlenmeyer flask for observation. When it is confirmed that the formaldehyde solution has no suspended matter and is clear and transparent, the depolymerization is completed and transferred to the next process;

[0020] 4) During the depolymerization process, form...

Embodiment 2

[0023] A method for depolymerizing formaldehyde containing paraformaldehyde dust, comprising the following steps:

[0024] 1) Add light formaldehyde containing dust into the liquid storage tank, the addition amount is 3.5m³;

[0025] 2) Pass steam to the heater connected to the liquid storage tank to heat the light formaldehyde. The steam pressure is controlled at 0.4MP. and keep warm;

[0026] 3) After 1.5 hours of heat preservation, the formaldehyde solution in the liquid storage tank gradually changed from turbid to transparent. Observe the depolymerization in the liquid storage tank through the sight glass. When the solution is transparent, take a sample of 200 ml and put it in the Erlenmeyer flask for observation. When it is confirmed that the formaldehyde solution has no suspended matter and is clear and transparent, the depolymerization is completed and transferred to the next process;

[0027] 4) During the depolymerization process, formaldehyde and water vapor will ...

Embodiment 3

[0030] A method for depolymerizing formaldehyde containing paraformaldehyde dust, comprising the following steps:

[0031] 1) Add light formaldehyde containing dust into the liquid storage tank, the addition amount is 3.5m³;

[0032] 2) Pass steam to the heater connected to the liquid storage tank to heat the light formaldehyde. The steam pressure is controlled at 0.5MP. ℃ and keep warm;

[0033] 3) After 2 hours of heat preservation, the formaldehyde solution in the liquid storage tank gradually changed from turbid to transparent. Observe the depolymerization in the liquid storage tank through the sight glass. When the solution is transparent, take a sample of 200 ml and put it in the Erlenmeyer flask for observation. When it is confirmed that the formaldehyde solution has no suspended matter and is clear and transparent, the depolymerization is completed and transferred to the next process;

[0034] 4) During the depolymerization process, formaldehyde and water vapor will ...

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Abstract

The invention provides a depolymerization method of formaldehyde containing paraformaldehyde dust, and the method comprises the following steps: adding 3.5m<3> of dilute formaldehyde containing dust into a liquid storage tank; introducing steam into a heater communicated with the liquid storage tank to heat the dilute formaldehyde, controlling the steam pressure to be 0.3-0.5 MP, when the temperature of the dilute formaldehyde reaches 50-60 DEG C, adding 2000 L-5000 L of a dimethylamine solution with the content of 10-50%, continuously raising the temperature to 90-95 DEG C, and performing heat preservation; after the heat preservation is performed for 1-2 hours, and the formaldehyde solution in the liquid storage tank gradually changes from turbid to transparent, observing depolymerization in the liquid storage tank through sight glass, when the solution is observed to be transparent, sampling 200 ml of the solution and observing the solution in a triangular bottle, and when the formaldehyde solution is determined to be clear and transparent and free of suspended solids, completing the depolymerization and transferring to the next procedure. The depolymerization method for the formaldehyde containing the paraformaldehyde dust has simple steps, is convenient to use, can save energy, can return recovered formaldehyde to formaldehyde products, and does not affect the quality of the formaldehyde products.

Description

technical field [0001] The invention relates to chemical industry and pharmacy, in particular to a method for depolymerizing formaldehyde containing paraformaldehyde dust. Background technique [0002] Urotropine is mainly used as a curing agent for resins and plastics, as an aminoplast catalyst and foaming agent, as an accelerator for rubber vulcanization, as an anti-shrinkage agent for textiles, etc. It can also be used as a chromatographic analysis reagent, etc. Light formaldehyde containing paraformaldehyde dust can be used in the production of urotropine. The formaldehyde in this substance is a carcinogenic and environmentally polluting product. The current method for removing formaldehyde has high energy consumption and poor benefit. Contents of the invention [0003] To solve the problems raised in the above-mentioned background technology, the object of the present invention is to provide a method for depolymerizing formaldehyde containing paraformaldehyde dust, t...

Claims

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Application Information

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IPC IPC(8): C07C45/55C07C47/045
CPCC07C45/55
Inventor 翁振理
Owner 衡水市银河化工有限责任公司
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