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System and method for removing floccules in concentrated formic acid product

A flocculent, concentrated formic acid technology, applied in the field of formic acid preparation, can solve the problems of poor removal effect, unfavorable concentrated formic acid product sales, affecting the appearance of concentrated formic acid products, etc., and achieves the effect of simple effect

Pending Publication Date: 2022-02-01
聊城鲁西甲酸化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Formic acid is produced by the hydrolysis process of methyl formate. After rectification and concentration, concentrated formic acid products such as 99% formic acid are obtained. The product standard is colorless and transparent, but flocs and flocs often appear in the prepared concentrated formic acid products. The production of concentrated formic acid affects the appearance of concentrated formic acid products, which is not conducive to the sales of concentrated formic acid products. When these flocs are filtered, the removal effect is poor

Method used

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  • System and method for removing floccules in concentrated formic acid product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Select 100ml of PAM resin (polyacrylamide ion exchange resin), fill it into a glass column with pure water, and perform acid washing (5% HCl, treatment for 2h), alkali washing (5% NaOH, treatment for 2h) and water washing (de-salted water washing) Neutral); then replace the water in it with 99% formic acid solution, use a peristaltic pump to transport 99% formic acid flow reaction substance, control the flow rate at 10ml / min, detect the change of the main metal ion content in the solution before and after the treatment: the zinc element is 0.0282 The ppm dropped to 0.0056ppm, the iron element dropped from 0.0778ppm to 0.0212ppm, and the titanium element dropped from 0.0447ppm to 0.0061ppm. The treated 99% formic acid is colorless and transparent.

Embodiment 2

[0046] Choose 100ml KIP242 type purification resin (cation exchange resin), purchased from Hebei Kairui Environmental Protection Company, use pure water to fill in the glass column, first use formic acid solution to carry out pretreatment to this substance (the treatment amount is 1.5-2 of the volume of reaction substance) times), using a peristaltic pump to transport 99% formic acid circulation reaction substances, the flow rate was adjusted to 5ml / min, 10ml / min and 20ml / min respectively, after running for 24 hours, the zinc content in the solution dropped from 0.1505ppm to 0.0585ppm, 0.0294ppm respectively and 0.0295ppm, iron element content decreased from 0.5271ppm to 0.1195ppm, 0.0214ppm and 0.0287ppm, titanium element content decreased from 0.5971ppm to 0.0062ppm, 0.0021ppm and 0.0030ppm respectively.

[0047] After experiments, it was found that when the flow rate is small, the treatment effect is worse. The reason is analyzed: when the flow rate of formic acid is small, ...

Embodiment 3

[0050] Select 0.1m 3KIP242 type purification resin (cation exchange resin), purchased from Hebei Kairui Environmental Protection Company, filled into the reactor with pure water, replaced the water in the reaction substance with 99% formic acid, used pH test paper to detect 2-3 and replaced when the solution was clear Completed; adjust the flow meter to convey the material, and set the flow rate to 0.1m 3 / h, after running for about 140h, the content of main metal elements such as zinc, iron and titanium before and after solution treatment is basically unchanged (or even slightly increased), and the reaction substance is invalid. A total of 44.44m 3 Formic acid solution; after treatment with nitric acid, it is put into operation, and the flow rate is set to 0.1m 3 / h, loses its effect after 80 days of use.

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Abstract

The invention discloses a system and a method for removing floccules in a concentrated formic acid product, which are used for treating concentrated formic acid containing floccules by adopting an adsorbent or ion exchange resin until the concentration of metal ions in the concentrated formic acid is reduced to a set value. Metal ions in the concentrated formic acid are adsorbed by adopting an adsorbent or removed by adopting ion exchange resin, so that the concentration is reduced, impurity aggregation centers in the product are reduced, stable floccules are difficult to form, and the problem that the floccules are easy to generate in the concentrated formic acid product is effectively solved. As the content of the concentrated formic acid, especially 99% formic acid, reaches the standard, and the other impurities are within the standard range, the quality of the formic acid product is not influenced, and the sales of the formic acid product is not influenced.

Description

technical field [0001] The invention belongs to the technical field of formic acid preparation, and in particular relates to a system and method for removing flocs of concentrated formic acid products. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Formic acid is produced by the hydrolysis process of methyl formate. After rectification and concentration, concentrated formic acid products such as 99% formic acid are obtained. The product standard is colorless and transparent, but flocs and flocs often appear in the prepared concentrated formic acid products. The appearance of concentrated formic acid products is affected by the production of concentrated formic acid products, which is not conducive to the sales of concentrated formic acid products. When these flocs are filtered, the removal effect is poor. Contents of the invention [0004] For ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/47C07C53/02
CPCC07C51/47C07C53/02
Inventor 张承锋胡长英陈大伟李泽坤孙栋连秀玲姚林林
Owner 聊城鲁西甲酸化工有限公司
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