CN-224231417-U - Airtight experimental device for extracting formaldehyde from polyformaldehyde granules

Abstract

The utility model relates to the technical field of gas extraction, in particular to a closed experimental device for extracting formaldehyde from polyoxymethylene granules, which comprises a melt index instrument, a beaker with an upper nozzle and a lower nozzle, meng Shi wash bottles and a peristaltic pump, wherein a charging barrel is arranged in a box body of the melt index instrument, a beaker with the upper nozzle and the lower nozzle is arranged at an outlet of the charging barrel, the beaker with the upper nozzle and the lower nozzle is sealed with the melt index instrument through a sealing gasket, a first gas pipeline is communicated between an outlet pipe of the beaker and a Monday wash bottle, a second gas pipeline is communicated between the Meng Shi wash bottle and an inlet pipe of the beaker, and the peristaltic pump is arranged on the second gas pipeline. The utility model has reasonable and compact structure and convenient use, improves the accuracy of extracting the formaldehyde content from the polyformaldehyde granules, and provides powerful data support for the polyformaldehyde production process of enterprises.

Inventors

• WANG YUN
• LI JINGYUE
• ZHANG CAIXIA
• LI HAIYAN
• HE YAMIN
• YANG CHEN
• Mao Xuran

Assignees

• 新疆心连心能源化工有限公司

Dates

Publication Date

20260512

Application Date

20250605

Claims (10)

1. 1. The airtight experimental device for extracting formaldehyde from the polyformaldehyde granules is characterized by comprising a melt index instrument, an upper nozzle beaker, a lower nozzle beaker, meng Shi wash bottles and a peristaltic pump, wherein a charging barrel is arranged in a box body of the melt index instrument, an upper nozzle beaker and a lower nozzle beaker with upward openings are correspondingly arranged at a bottom outlet of the charging barrel, a cup mouth of the upper nozzle beaker and a bottom of the box body of the melt index instrument are sealed through sealing gaskets, a beaker inlet pipe is fixedly communicated with the upper part of the upper nozzle beaker and the lower nozzle beaker, a beaker outlet pipe is fixedly communicated with the lower part of the upper nozzle beaker and the lower nozzle beaker, a first gas pipeline is fixedly communicated between the beaker outlet pipe and an inlet of the top of the Meng Shi wash bottle, a second gas pipeline is fixedly communicated between an outlet of the top of the Meng Shi wash bottle and the beaker inlet pipe, and the peristaltic pump is fixedly arranged on the second gas pipeline.
2. 2. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 1, wherein the gasket is polytetrafluoroethylene gasket.
3. 3. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 1 or 2, wherein a lifting table is further provided at the bottom of the beaker with upper and lower nozzles.
4. 4. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 3, wherein a heating furnace is further provided at the bottom of Meng Shi wash bottles.
5. 5. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 1, 2 or 4, wherein a gas-washing pipe is fixedly connected to the gas inlet at the top of the banjo-type wash bottle, the gas outlet of the gas-washing pipe extends to the inner bottom of the banjo-type wash bottle, and a gas outlet pipe is fixedly connected to the gas outlet at the top of the Meng Shi-type wash bottle.
6. 6. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 5, wherein a first gas line is fixedly connected between the outlet pipe of the beaker and the gas inlet of the gas washing pipe.
7. 7. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 6, wherein a second gas line is fixedly connected between the outlet of the gas outlet pipe of the wash bottle and the inlet pipe of the beaker.
8. 8. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 1 or 2 or 4 or 6 or 7, wherein the first gas line and the second gas line are plastic hoses.
9. 9. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 8, wherein a wash bottle inlet valve is fixedly installed on the first gas line.
10. 10. The closed experimental device for extracting formaldehyde from polyoxymethylene pellets as set forth in claim 1 or 2 or 4 or 6 or 7 or 9, wherein a wash bottle outlet valve is fixedly installed on the second gas line.

Description

Airtight experimental device for extracting formaldehyde from polyformaldehyde granules Technical Field The utility model relates to the technical field of gas extraction, in particular to a closed experimental device for extracting formaldehyde from polyformaldehyde granules. Background Polyoxymethylene (POM) is a white, flammable crystalline powder with formaldehyde odor. The melting point is 121 ℃ to 123 ℃, the flash point is 71.1 ℃ and the self-ignition point is 300 ℃. Polyoxymethylene is a linear polymer having no side chains, high density and high crystallinity, and has excellent overall properties. It is known as "super steel" or "racing steel" and has hardness, strength and rigidity similar to those of metal. Polyoxymethylene is widely used in the fields of electronics, electricity, machinery, instruments, daily light industry, automobiles, building materials, agriculture and the like. The concrete application includes manufacturing various sliding and rotating mechanical parts, such as gears, levers, pulleys, chain wheels, etc., and is particularly suitable for being used as bearings, hot water valves, precision metering valves, chain links and rollers of conveyors, etc. ‌. The polyformaldehyde pellet is produced through evaporating 37% formaldehyde under reduced pressure, catalytic condensation to obtain solid formaldehyde, filtering, washing with water and vacuum drying to obtain product with formaldehyde content of 93-95%. In the production process of the polyoxymethylene pellets, formaldehyde content measurement is often carried out on the polyoxymethylene pellets, and the measurement of the formaldehyde content data of the polyoxymethylene pellets can provide data support for the polyoxymethylene production process, so that the polyoxymethylene pellet products can meet expected performance requirements. The formaldehyde content of the polyformaldehyde granules is measured in the laboratory at present by firstly using melting equipment to heat and melt the polyformaldehyde granules, then using gas collecting equipment to collect gas released in the melting process of the polyformaldehyde granules, finally dissolving the collected gas in dissolving equipment filled with water to obtain formaldehyde solution, reacting the formaldehyde solution with a color reagent acetylacetone to generate a colored compound according to the measurement principle of HJ 601-2011 'spectrophotometry for measuring acetylacetone of water quality formaldehyde', and measuring absorbance at a wavelength of 414nm to obtain the formaldehyde content value. However, the connecting interfaces among the conventional polyformaldehyde melting equipment, formaldehyde gas collecting equipment and formaldehyde solution collecting equipment are all of non-national standard uniform caliber, so that the air tightness of the connecting parts among the equipment is low, the problem of low air tightness can cause that formaldehyde gas in an experiment can not be completely dissolved in reclaimed water, the formaldehyde content detection result is finally low, and the formaldehyde gas in the experimental process escapes to cause environmental pollution. In conclusion, the problem of large error in extracting formaldehyde content from the polyoxymethylene pellets brings wrong performance indexes to the polyoxymethylene production process, causes serious economic loss, and becomes a technical problem to be solved urgently by enterprises. Disclosure of Invention The utility model provides a closed experimental device for extracting formaldehyde from polyformaldehyde granules, which overcomes the defects of the prior art and can effectively solve the problem of large error in extracting formaldehyde content from polyformaldehyde granules. The technical scheme is that the airtight experimental device for extracting formaldehyde from polyoxymethylene pellets comprises a melt index instrument, a beaker with an upper nozzle and a lower nozzle, a Meng Shi bottle washing and a peristaltic pump, wherein a charging barrel is arranged in a box body of the melt index instrument, the upper nozzle and the lower nozzle of the beaker with an upward opening are correspondingly arranged at an outlet at the bottom of the charging barrel, a beaker inlet pipe is fixedly communicated with the upper part of the beaker with the upper nozzle and the lower nozzle of the beaker, a beaker outlet pipe is fixedly communicated with the lower part of the beaker with the upper nozzle and the lower nozzle of the beaker, a first gas pipeline is fixedly communicated between the beaker outlet pipe and an inlet at the top of the Meng Shi bottle washing, a second gas pipeline is fixedly communicated between the outlet at the top of the Meng Shi bottle washing and the beaker inlet pipe, and the peristaltic pump is fixedly arranged on the second gas pipeline. The following are further optimizations and/or improvements to the above-described inventive solution: the sealing gasket i