A kind of treatment method of polyoxymethylene in the iron-molybdenum method formaldehyde absorption process

A formaldehyde absorption and treatment method technology, applied in the separation/purification of carbonyl compounds, organic chemistry and other directions

Active Publication Date: 2022-02-01
SHANXI HEIMAO JIAOHUA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that formaldehyde derivative polyoxymethylene is easily produced in the existing formaldehyde absorption process, the present invention provides a treatment method for polyoxymethylene in the iron-molybdenum method formaldehyde absorption process, the method is simple to operate, the system is stable, and the formaldehyde yield is high And high safety, effectively avoiding personal injury caused by artificially adding supplementary fluid

Method used

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  • A kind of treatment method of polyoxymethylene in the iron-molybdenum method formaldehyde absorption process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] see figure 1 , the iron-molybdenum method formaldehyde absorption system structure that the present invention realizes the processing method of polyoxymethylene in the iron-molybdenum method formaldehyde absorption process that adopts is as follows:

[0018] The formaldehyde absorption system includes a formaldehyde absorption tower 1, a first-stage circulation pipeline 7, a second-stage circulation pipeline 8, a fourth-stage circulation pipeline 9, a formaldehyde underground storage tank 2, a first-stage circulation pump 3, a second-stage circulation pump 4, and a fourth-stage circulation Pump 5, supplementary liquid circulation pump 6, lye pump 10, supplementary liquid delivery pipe 11; wherein the tower body of formaldehyde absorption tower 1 is provided with the first absorption section, the second absorption section, the third absorption section, the first absorption section from top to bottom Four absorption sections and a liquid collection chamber, the first abso...

Embodiment 2

[0026] In the present embodiment, the inlet of the four-stage circulation pump 5 in the four-stage circulation pipeline 9 communicates with the outlet of the absorption liquid in the fourth absorption section of the formaldehyde absorption tower 1 through the pipeline, and the outlet of the four-stage circulation pump 5 communicates with the formaldehyde through the pipeline. The absorption liquid inlet of the fourth absorption section of the absorption tower 1 is connected.

[0027] When in use, use the supplementary liquid circulation pump 6 to add the supplementary absorption liquid to the second-stage circulation pipeline 8 according to a certain amount, mix it with the circulating liquid, and then send it to the top of the second absorption section in the tower body through the second-stage circulation pump 4 Circular spraying until the pH value at the bottom of the first absorption section stabilizes to about 8, and stop supplementary absorption liquid compensation additi...

Embodiment 3

[0030] In the present embodiment, the inlet of the second-stage circulation pump 4 in the two-stage circulation pipeline 8 is communicated with the second absorption stage absorption liquid outlet of the formaldehyde absorption tower 1 through the pipeline, and the outlet of the second-stage circulation pump 4 is connected with the formaldehyde through the pipeline. The absorption liquid inlet of the second absorption section of the absorption tower 1 is connected.

[0031] When in use, use the supplementary liquid circulation pump 6 to add the supplementary absorption liquid to the four-stage circulation pipeline 9 according to a certain amount, mix it with the circulation liquid, and then send it to the top of the fourth absorption section in the tower body through the four-stage circulation pump 5 Circular spraying until the pH value at the bottom of the first absorption section stabilizes to about 8, and stop supplementary absorption liquid compensation addition.

[0032] ...

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Abstract

The present invention relates to a treatment method of polyoxymethylene in the iron-molybdenum method formaldehyde absorption process, which mainly collects the bottom absorption liquid in the first absorption section into the formaldehyde underground storage tank, and adds hydrogen into the formaldehyde underground storage tank Sodium oxide solution becomes the supplementary absorption liquid, and the supplementary absorption liquid is added to the external circulation pipe section of the second absorption section and / or the fourth absorption section according to a certain amount by the supplementary liquid circulation pump, and it is mixed with the circulating liquid and returned to each absorption section. The top of the first absorption section is circulated and sprayed until the pH value of the absorption liquid at the bottom of the first absorption section stabilizes to about 8; the present invention effectively handles the generated polyoxymethylene to ensure the normal operation of the system, the quality of the formaldehyde product is qualified, and the unqualified formaldehyde solution is returned to the system The cycle generates formaldehyde again, greatly increasing the yield of formaldehyde.

Description

technical field [0001] The invention belongs to the technical field of iron-molybdenum method formaldehyde absorption, in particular to a method and system for treating polyoxymethylene in the iron-molybdenum method formaldehyde absorption process. Background technique [0002] Formaldehyde is one of the important raw materials in the organic chemical industry, widely used in wood industry, textile industry, anti-corrosion solvent and other industries. The current formaldehyde production is mainly two processes of silver method and iron-molybdenum method, and the iron-molybdenum method is widely used because of its advantages such as high formaldehyde conversion rate, high catalyst activity, mild operating conditions, and good product quality. [0003] At present, in the iron-molybdenum method formaldehyde production system, the formaldehyde absorption system often leads to the production of derivatives such as polyoxymethylene due to poor temperature and pH control during o...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C07C45/78C07C47/058
CPCC07C45/78C07C47/04
Inventor师文涛谢伟安哲明王军宁邢金虎
OwnerSHANXI HEIMAO JIAOHUA CO LTD