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Reuse method of formalin precipitate

A formalin and sediment technology, which is applied in the field of formalin sediment reuse, can solve the problems of poor reuse, waste, and pollution of formalin solution sediment, and achieve convenient operation, Effects of reducing waste and saving energy

Inactive Publication Date: 2006-06-14
胡秀珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] What this invention is to solve is that the formalin solution sediment is not well reused at present, and most users just dump the formalin sediment, which is not only a waste, but also a pollution problem, to provide a reuse method that can make better use of formalin sediment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: The formalin precipitate is stirred and dispersed in an appropriate amount of water, and potassium hydroxide solution is added to make the pH value of the whole system less than 13, and the paraformaldehyde in the system is depolymerized into formaldehyde monomer. At this time, the system The precipitate in the solution was removed, and the system was neutralized with sulfuric acid solution.

Embodiment 2

[0009] Embodiment 2: The formalin precipitate is stirred and dispersed in an appropriate amount of water, and calcium hydroxide solution is added to make the pH value of the whole system less than 13, and the paraformaldehyde in the system is depolymerized into formaldehyde monomer. At this time, the system The precipitate in the solution was removed, and the system was neutralized with sulfuric acid solution.

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PUM

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Abstract

The present invention relates to a reutilization method of chemical raw material, in the concrete, it relates to a reutilization method of formalin precipitate. Said method includes the following steps: placing the formalin precipitate in proper quantity of water, stirring and making the formalin precipitate be dispersed, adding alkaline solution, making pH value of whole system be less than 13, depolymerizing paraformaldehyde into formaldehyde monomer, removing precipitate in said system, and using acidic solution to neutralize said system.

Description

technical field [0001] The invention relates to a method for reusing chemical raw materials, specifically a method for reusing formalin precipitates. Background technique [0002] As we all know, formalin is a basic chemical raw material, which is widely used in industries such as phenolic plastics, synthetic resins, paints, pharmaceuticals, leather, printing and dyeing, and in medical research. Due to the influence of various conditions, the formaldehyde in the formalin solution is easy to polymerize into paraformaldehyde, and the impurities produced by long-term storage and other reasons are precipitated out of the solution to form formalin precipitates. The problem of reuse of this sediment has not been well resolved. Most users dump the formalin sediment, which is not only a waste, but also a pollution. Contents of the invention [0003] What this invention is to solve is that the formalin solution sediment is not well reused at present, and most users just pour out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/04C07C45/90
Inventor 胡秀珍
Owner 胡秀珍