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Electronic grade citric acid and production method thereof

A citric acid, electronic grade technology, applied in the field of electronic grade citric acid and its production process, can solve the problem of reducing cation content and achieve the best market prospect

Active Publication Date: 2011-02-16
RIZHAO JINHE BOYUAN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at obtaining qualified electronic-grade citric acid products that cannot effectively reduce the content of cations in the existing technology, and provides an electronic-grade citric acid and a production method thereof. Various metal ions in the citric acid are - 4 2- <1μg / g, the content of citric acid is ≥99.5%. The fermentation liquid from the fermentation process is filtered, and then extracted through neutralization and acid hydrolysis processes. The extract is further removed by carbon columns, cation exchange columns, and anion exchange columns. Miscellaneous, to obtain a separation solution; or dissolve industrial-grade, food-grade, pharmaceutical-grade citric acid products with electronic-grade water to obtain a citric acid solution

Method used

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  • Electronic grade citric acid and production method thereof
  • Electronic grade citric acid and production method thereof
  • Electronic grade citric acid and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Pass the citric acid chaotropic liquid into a cation exchange column equipped with D-412 chelating resin, and the column loading steps are: adjust the temperature of the citric acid solution into the column to be 55° C., and the concentration of citric acid to be 35%. The citric acid solution flows in from the top of the positive column at a flow rate of 2BV / h. When the concentration of the outflowing citric acid solution is 0.2 times the concentration of the incoming column, start to collect the positive column ion exchange liquid, and detect the cation content of the material at any time. When the outflow solution When the potassium ion content reaches 1μg / g, the collection is stopped, and the positive column fails at this time. After the cation exchange resin fails, use reagent grade hydrochloric acid or sulfuric acid to configure regeneration acid, and the process water uses electronic grade ultrapure water.

[0032]Pass the ion exchange liquid from the cation excha...

Embodiment 2

[0036] Pass the industrial grade citric acid solution into a cation exchange column equipped with D-412 chelating resin, and the column loading steps are as follows: adjust the temperature of the citric acid solution into the column to be 60° C., and the concentration of citric acid to be 40%. The citric acid solution flows in from the top of the positive column at a flow rate of 3BV / h. When the concentration of the citric acid solution flowing out is 0.5 times the concentration of the incoming column, start to collect the positive column ion exchange liquid, and detect the cation content of the material at any time. When the potassium ion content reaches 1μg / g, the collection is stopped, and the positive column fails at this time. After the cation exchange resin fails, use reagent grade hydrochloric acid or sulfuric acid to configure regeneration acid, and the process water uses electronic grade ultrapure water.

[0037] Pass the ion exchange liquid from the cation exchange c...

Embodiment 3

[0041] The food-grade citric acid solution is passed into a D-412 chelating resin cation exchange column, and the column loading step is as follows: adjust the temperature of the citric acid solution into the column to be 55 ° C, the concentration of citric acid is 40%, and the citric acid solution is added at 1.5 The flow rate of BV / h flows in from the top of the positive column. When the concentration of the outflowing citric acid solution is equal to the concentration of the incoming column, start to collect the ionized liquid of the positive column, and detect the cation content of the outgoing material at any time. When the potassium ion content of the outflow solution reaches 1μg / g , stop collecting, and the Yang column will fail at this time. After the cation exchange resin fails, use reagent grade hydrochloric acid or sulfuric acid to configure regeneration acid, and the process water uses electronic grade ultrapure water.

[0042] Pass the ion exchange liquid from the...

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Abstract

The invention relates to an electronic grade citric acid and a production method thereof. In the citric acid, each metal ion is less than 0.5 mu g / g, heavy metal is less than 0.1 mug / g, Cl<-> is less than 1 mu g / g, SO4<2-> is less than 1 mu g / g, and the content of citric acid is not more than 99.5%. The production method comprises the following steps of: filtering a fermentation liquid from a fermentation procedure, extracting through neutralization and acidolysis procedures, further removing impurities of the extraction liquid through a carbon column, a cation exchange column and an anion exchange column to obtain an ion exchange liquid; alternatively, dissolving an industrial grade, food grade or medical grade citric acid product in electronic grade water to obtain a citric acid solution; leading the ion exchange liquid or the citric acid solution to pass through an cation exchange column and an anion exchange column loaded with specific resin, concentrating, precisely filtering, crystallizing, centrifuging, drying, screening and packaging to obtain the electronic grade citric acid. The electronic grade citric acid can be applied to the chemical etching and the chemical cleaningof very large scale integrated circuits, large screen liquid crystal displays and other microelectronics industries.

Description

technical field [0001] The invention relates to the field of deep processing of citric acid, in particular to an electronic grade citric acid and a production process thereof. Background technique [0002] Citric acid is an excellent pH buffering agent, heavy metal ion chelating agent and sour agent, widely used in the fields of medicine and health, food industry, cosmetics and so on. [0003] Electronic grade citric acid is a high-purity citric acid with very low content of metal ions and inorganic anions. This product is mainly used for silicon wafer cleaning, substrate wet cleaning, wet etching and degumming in the field of integrated circuit and electronic component processing. Wait. [0004] At present, citric acid products in the world are mainly citric acid monohydrate and citric acid anhydrous. Due to its mature production technology, low product prices, and low technical thresholds, domestic production capacity has rapidly expanded, leading to rapid expansion of i...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/47
Inventor 寇光智丁兆堂李昌涛楼良旺周昊刘剑雄安丰民范开山
Owner RIZHAO JINHE BOYUAN BIOCHEM
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