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Anhydrous formaldehyde gas preparation device and process

A technology for the preparation of anhydrous formaldehyde and gas, which is applied in the preparation of heterocyclic compounds, organic chemistry, separation/purification of carbonyl compounds, etc., can solve the problems of unstable diffusion rate, tedious and time-consuming production process, low formaldehyde concentration, etc., and achieve Simple structure, easy assembly and convenient storage

Active Publication Date: 2021-10-01
SHANTOU UNIV MEDICAL COLLEGE
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of anhydrous formaldehyde gas preparation device in order to overcome the unstable diffusion rate, tedious and time-consuming production process and low concentration of prepared formaldehyde in the process of preparing anhydrous methanol gas in the prior art. Simple, easy to operate, can prepare N in 2 hours 2 Mixed gas with methanol gas is of great significance for preparing standard formaldehyde gas and exploring the physiological and toxicological properties of formaldehyde gas on the human body

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  • Anhydrous formaldehyde gas preparation device and process
  • Anhydrous formaldehyde gas preparation device and process

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Embodiment 1

[0054] Embodiment 1 A kind of anhydrous formaldehyde gas preparation device

[0055] An anhydrous formaldehyde gas preparation device, comprising a carrier gas supply assembly 1, a gas drying and purification assembly 2, a flow meter 3, a constant temperature diffusion chamber 4, a high temperature cracking chamber 5, a cooling purification filtration assembly 6, a gas storage bottle 7 and Exhaust gas collection assembly 8.

[0056] The anhydrous formaldehyde gas preparation device of the present invention uses paraformaldehyde as a raw material for the production of anhydrous formaldehyde, and paraformaldehyde is an important chemical product, also known as trioxane. The depolymerization of paraformaldehyde produces formaldehyde monomer, and no water molecules will be generated in this process, so paraformaldehyde is selected as the raw material for preparing formaldehyde monomer. The melting point of paraformaldehyde is 62 ° C. When heated above 62 ° C, it will be converted...

Embodiment 2

[0083] Embodiment 2 A kind of anhydrous formaldehyde gas preparation process

[0084] A kind of technique that utilizes the device described in embodiment 1 to prepare anhydrous formaldehyde gas, specifically comprises the steps:

[0085] ②The high-purity nitrogen enters the gas circuit system after being dried and purified by the first drying pipe 21, the gas purifier 22 and the second drying pipe 23;

[0086] ②Put 0.5g of paraformaldehyde particles in the diffusion tube 421, seal it with a cover and bake in an oven at 63°C for 1 hour until it completely becomes liquid paraformaldehyde, and gradually lower the temperature to keep the paraformaldehyde diffusion surface in a horizontal state, ensuring that the three POM diffuses at a constant rate, obeying Fick's law of diffusion;

[0087] ③The gas storage bottle 7 is baked in an oven at 110°C for 2 hours to remove the moisture on the inner wall, and after cooling, the bottle is filled with N 2 . Replace the phosphorus pento...

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Abstract

The invention belongs to the technical field of chemical production, and specifically discloses an anhydrous formaldehyde gas preparation device and process. The anhydrous formaldehyde gas preparation device includes a carrier gas supply assembly, a gas drying and purification assembly, a flow meter, a constant temperature diffusion chamber, a high temperature cracking chamber, a cooling purification filter assembly, a gas storage bottle and an exhaust gas collection assembly connected in sequence. The device has good sealing performance and can maintain a stable diffusion rate for a long time. The nitrogen flow rate is controlled by adjusting the flow meter valve, and the concentration of formaldehyde gas is controlled by adjusting the temperature of the constant temperature diffusion chamber, the length of the diffusion tube and the length of the high-temperature cracking tube. The formaldehyde gas concentration ranges from 0.1 to 50nmol / mL, which can easily and quickly produce high-concentration and high-purity anhydrous formaldehyde gas.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to an anhydrous formaldehyde gas preparation device and process. Background technique [0002] Formaldehyde (HCHO), also known as formic aldehyde, is a colorless gas with a strong pungent odor and the simplest aldehyde in its chemical structure. A large number of epidemiological studies have shown that formaldehyde has toxic effects on the nervous system, immune system, reproductive system, respiratory system, and cardiovascular system. Therefore, in 2012, the International Agency for Research on Cancer of the World Health Organization listed it as a first-class environmental carcinogen. [0003] However, formaldehyde, as an organic gas molecule that appeared in the early days of the earth, participated in the birth and evolution of early life on the earth, and still exists in organisms today. The body's own metabolism can produce formaldehyde, and the reported enzymes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/60C07C45/78C07C47/045C07C47/058
CPCC07C45/60C07C45/78C07C47/04
Inventor 吴鹏罗红军林哲绚纪堉彬罗文鸿
Owner SHANTOU UNIV MEDICAL COLLEGE
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