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The preparation method of electronic grade ethyl lactate

An ethyl lactate, electronic-grade technology, applied in the field of preparation of electronic-grade ethyl lactate, can solve problems such as high equipment requirements, low production efficiency, large reflux ratio, etc., to avoid impurity pollution, save investment costs, and improve production efficiency. Effect

Active Publication Date: 2016-09-28
XIAOGAN ESUN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the rectification process requires a very large reflux ratio, high equipment requirements, low production efficiency, high energy consumption, and the product is easily polluted by impurities in the air, and the purity is not guaranteed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Ion-exchange resin adsorption: 2000ml content of 99% food-grade ethyl lactate is sequentially passed through an ion-exchange column equipped with macroporous weakly basic styrene anion resin adsorption and macroporous weakly acidic acrylic cationic resin ion resin, each The length of the ion exchange column is 3m, and the flow rate is 6m / h. After passing through the ion exchange column, most of the metal ions in ethyl lactate can be controlled within 100ppb, but the water content rises slightly.

[0025] 2) Vacuum rectification: Add the ethyl lactate adsorbed by ion exchange into the laboratory-made rectification tower for vacuum rectification. The tower height of the rectification tower is 1.3m, the inner diameter of the tower is 34mm, and the packing used is preferably 316L Type 1.5mm×1.5mm triangular spiral packing, the number of theoretical plates is 41-45; the temperature at the bottom of the rectification tower is 69-71°C, the temperature at the top of the tower...

Embodiment 2

[0028] 1) Ion-exchange resin adsorption: 2000ml of 99% food-grade ethyl lactate is passed sequentially through the adsorption of macroporous weakly basic styrene anion resin, macroporous weakly acidic acrylic cationic resin ion resin and neutral ion exchange resin. The ion exchange column, the length of each ion exchange column is 3m, and the flow rate is 4m / h. After passing through the ion exchange column, most of the metal ions in ethyl lactate can be controlled within 100ppb, but the water content rises slightly.

[0029] 2) Vacuum rectification: Add the ethyl lactate adsorbed by ion exchange into the laboratory-made rectification tower for vacuum rectification. The tower height of the rectification tower is 1.3m, the inner diameter of the tower is 34mm, and the packing used is preferably 316L Type 1.5mm×1.5mm triangular spiral packing, the number of theoretical plates is 41-45; the temperature at the bottom of the rectification tower is 80-84°C, the temperature at the top o...

Embodiment 3

[0032] 1) Ion-exchange resin adsorption: 2000ml of 99% food-grade ethyl lactate is passed sequentially through the adsorption of macroporous weakly basic styrene anion resin, macroporous weakly acidic acrylic cationic resin ion resin and neutral ion exchange resin. The ion-exchange column, the length of each ion-exchange column is 3m, and the flow rate is 10m / h. After passing through the ion-exchange column, most of the metal ions in ethyl lactate can be controlled within 100ppb.

[0033] 2) Vacuum rectification: Add the ethyl lactate adsorbed by ion exchange into the laboratory-made rectification tower for vacuum rectification. The tower height of the rectification tower is 1.3m, the inner diameter of the tower is 34mm, and the packing used is preferably 316L Type 1.5mm×1.5mm triangular spiral packing, the number of theoretical plates is 41-45; the temperature at the bottom of the rectification tower is 62-65°C, the temperature at the top of the tower is 34-37°C, the temperatu...

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Abstract

The invention discloses a preparation method of electronic ethyl lactate. According to the method, food-grade ethyl lactate is used as a raw material and absorbed by ion exchange resin to remove most of metal ions; then the pressure reduction rectification is carried out so as to remove water, light-component impurities and heavy-component impurities; finally, sub-boiling distillation is carried out in the presence of high-purity nitrogen to remove metal ions, so as to obtain electronic ethyl lactate. The prepared electronic ethyl lactate contains not less than 99.99% of ethyl lactate, not greater than 1ppb of lead ions, copper ions, iron ions, magnesium ions, arsenic ions, calcium ions, aluminum ions, zinc ions, manganese ions, mercury ions, chromium ions, nickel ions, potassium ions and sodium ions, and not greater than 100ppm of water; the acidity of the prepared electronic ethyl lactate is not greater than 65ppm; therefore, the electronic grade is met. The whole preparation does not involve the emission of wastewater, waste gas and waste slag, has a low requirement on a device, does not need large reflux ratio during rectifying, can be used for greatly reducing the energy consumption to save the cost, and is fast, efficient, environmentally friendly and free of pollution.

Description

technical field [0001] The present invention relates to the purification method of ethyl lactate, specifically a kind of preparation method of electronic grade ethyl lactate. Background technique [0002] Electronic grade ethyl lactate is mainly used in the cleaning of precision electronic components. It has aroma and low volatility, which effectively improves the strong pungent smell of traditional solvents; Dirt and water-soluble dirt have strong dissolving ability and unique solubility; as a cleaning agent, it has less loss than other cleaning agents, high cost performance, and has no adverse effects on the cleaned objects. [0003] For the purification technology of electronic grade ethyl lactate, Chinese patent CN102320969A discloses a systematic method for rectifying and purifying food grade ethyl lactate into electronic grade ethyl lactate. In this method, the rectification process requires a very large reflux ratio, high equipment requirements, low production effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/68C07C67/48
CPCC07C67/54C07C67/56C07C69/68
Inventor 杨义浒陈锐方文拓
Owner XIAOGAN ESUN NEW MATERIAL
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