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An anti-clogging online sampling device for the mother liquor of a paraformaldehyde reaction kettle

A sampling device and trioxymethylene technology, which is applied in the sampling device and other directions, can solve the problem that the sampling pipeline is easy to be blocked and so on.

Active Publication Date: 2020-10-20
YANKUANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The line sampling device of the present invention can not only realize online sampling at any time, but also does not need to continuously feed hot water during the entire use period to prevent the ball valve from being blocked, reduce hot water consumption, and there will be no mother liquor and The paraformaldehyde generated by the reaction can well solve the problem that the sampling pipeline is easily blocked

Method used

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  • An anti-clogging online sampling device for the mother liquor of a paraformaldehyde reaction kettle
  • An anti-clogging online sampling device for the mother liquor of a paraformaldehyde reaction kettle
  • An anti-clogging online sampling device for the mother liquor of a paraformaldehyde reaction kettle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as Figure 1-3 As shown, a paraformaldehyde reaction kettle mother liquor anti-blocking online sampling device, including: sampling sealing plug 1, sampling sealing plug fixing cover 2, sampling distance sleeve 3, flushing hole 4, sampling push rod 5, reaction kettle connection method Lan 6, sampling device body 7, sealing packing 8, packing gland 9, sampling push rod nut 10, sampling push rod hand wheel 11, sampling push rod threaded part 12, temperature instrument 13, flushing outlet flange 14, sampling device Outlet pipe 15, hot water inlet flange 16, hot nitrogen inlet flange 17, sampling outlet flange 18, and liquid-taking cavity 19.

[0059] One end of the sampling device body 7 is connected to the sampling distance sleeve 3 through the connecting flange 6 of the reaction kettle.

[0060] Offer a through hole in the sampling device body 7, the sampling push rod 5 runs through the through hole, and one end of the sampling push rod 5 extends to the outside of ...

Embodiment 2

[0070] A paraformaldehyde reaction kettle mother liquor anti-blocking online sampling device, the same as embodiment 1, the difference is that: the outlet pipe 15 of the sampling device communicates with the part of the liquid sampling cavity 19 located in the sampling device body 7, and the flushing hole 4 Set at a position 13mm from the top of the sampling push rod. The diameter of the flushing hole 4 is 3mm. The number of the flushing holes 4 is four, and they are evenly distributed along the same circumferential direction of the sampling push rod 5 . The diameter of the flushing liquid channel hole is 5mm.

Embodiment 3

[0072] A method for anti-clogging online sampling of a paraformaldehyde reactor mother liquor, comprising the steps of:

[0073] (1) Preheating: First, open the ball valves at the flange 14 of the flushing discharge outlet and the flange 17 of the hot nitrogen gas inlet in sequence, and feed in hot nitrogen gas at 100°C to preheat the sampling device. The hot nitrogen gas passes through the hot nitrogen gas inlet c, and then passes through After the outlet pipe 15 of the sampling device, the liquid sampling cavity 19, the flushing hole 4 and the flushing liquid flow channel hole, it is discharged from the flushing outlet d, and the preheating process lasts for 3 minutes;

[0074] (2) Sampling: open 18 ball valves of the sampling outlet flange, rotate the sampling push rod handwheel 11 and push the sampling push rod 5 into the reaction vessel for sampling, the mother liquor passes through the liquid sampling cavity 19 and the sampling device outlet pipe 15, and then After the s...

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Abstract

The invention relates to an anti-blocking online sampling device for a mother liquor trioxane reaction kettle, belongs to the technical field of chemical synthesis. The invention comprises a samplingdevice outlet pipe, a hot water inlet flange, a hot nitrogen gas inlet flange, a sampling outlet flange, a sampling push rod and a flushing outlet flange. Therefore, the online sampling of the reaction mother liquor is achieved. Moreover, after sampling, the sampling device can be cleaned and dried in time without destroying the sealed state of the reaction mother liquid, thereby preventing the sampling device from being clogged. It is not necessary to pass the hot water at all times to prevent residual reaction mother liquor from forming plastic-like paraformaldehyde to block ball valves andpipes, which effectively avoids waste of hot water.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to an on-line sampling device for mother liquor from a paraformaldehyde reaction kettle. Background technique [0002] Polyoxymethylene (POM) is one of the five engineering plastics widely used at present, and trioxane is an important intermediate of polyoxymethylene, and trioxane (C 3 h 6 o 3 ) is synthesized by formaldehyde (CH2O) in a large vertical container reactor under the catalysis of sulfuric acid. [0003] The reaction temperature of the mother liquor of the paraformaldehyde reactor is 99 ° C, and the ingredients are formaldehyde solution, paraformaldehyde, sulfuric acid, formic acid and paraformaldehyde generated by side reactions. The properties of the mixed material are very special and highly corrosive. When the temperature is ≤65℃, it will solidify directly, and it will slowly polymerize itself at any temperature, and the mother liquor mixture will gradu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/10
CPCG01N1/10
Inventor 王广义臧笑臣龙厚坤田欣尉孟凡超沈祺孔令腾马振周房传新魏庆印
Owner YANKUANG GRP CO LTD
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