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Recycling method of 2-hydroxybenzoic acid-2-ethyl caprolactone production liquid waste

A technology of hydroxybenzoic acid and ethylhexyl ester, applied in the preparation of carboxylate, chemical instruments and methods, preparation of carboxylate, etc., can solve problems such as environmental pollution, increase the difficulty of wastewater treatment, waste resources, etc. Difficulty, high cost, and the effect of reducing processing costs

Active Publication Date: 2013-09-11
宜都市华阳化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, there are still a lot of sodium salicylate remaining in the wastewater, which wastes resources, increases the difficulty of subsequent wastewater treatment, and easily pollutes the environment

Method used

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  • Recycling method of 2-hydroxybenzoic acid-2-ethyl caprolactone production liquid waste
  • Recycling method of 2-hydroxybenzoic acid-2-ethyl caprolactone production liquid waste

Examples

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Effect test

Embodiment 1

[0016] The mass concentration of the wastewater to be treated is 30% hydrochloric acid to adjust the pH value to 2, fully stir for half an hour, until all the salicylic acid is precipitated, the amount of hydrochloric acid is 50Kg, and a total of 70Kg of salicylic acid crystals are recovered, with a water content of 16%. The purity of salicylic acid measured by gas chromatography reached 98.6%; the recovered salicylic acid crystals were calculated and directly added to the reaction tank as raw materials to carry out the esterification synthesis of the next batch of 2-hydroxybenzoic acid 2-ethylhexyl.

Embodiment 2

[0018] The mass concentration of waste water to be treated is that 30% hydrochloric acid adjusts the pH value to 2, fully stirs for half an hour, the acid consumption is 52Kg, reclaims 58Kg of salicylic acid crystals, and its water content is 16%, records the content of salicylic acid by gas chromatography The purity reaches 98.3%; the recovered salicylic acid crystals are calculated and directly added to the reaction tank as a raw material to carry out the esterification synthesis of the next batch of 2-hydroxybenzoic acid 2-ethylhexyl.

Embodiment 3

[0020] The mass concentration of waste water to be treated is that 30% hydrochloric acid adjusts the pH value to 2, fully stirs for half an hour, the acid consumption is 45Kg, reclaims 55Kg of salicylic acid crystals, and its water content is 15%, records the content of salicylic acid by gas chromatography The purity reaches 98.3%; the recovered salicylic acid crystals are calculated and directly added to the reaction tank as a raw material to carry out the esterification synthesis of the next batch of 2-hydroxybenzoic acid 2-ethylhexyl.

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Abstract

The invention provides a recycling method of a 2-hydroxybenzoic acid-2-ethyl caprolactone production liquid waste. The method comprises: adjusting the pH of wastewater produced in an esterification synthesis procedure to 2 through hydrochloric acid with mass concentration of 30%, fully stirring for half an hour, separating out white crystals from the wastewater, and centrifugally dewatering to obtain salicylic acid crystals, wherein the purity of the crystals is not smaller than 98% and the water content is not larger than 18%; the obtained salicylic acid crystals can be used as production raw materials of 2-hydroxybenzoic acid-2-ethyl caprolactone, and the salicylic acid crystals are directly applied in the esterification synthesis of OS104 without being dried; and the consumption of the salicylic acid raw material is reduced, the production cost is lowered, and meanwhile, the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to a method for recovering and utilizing raw materials from chemical wastewater, in particular to a method for recovering and utilizing salicylic acid from the production waste liquid of salicylic acid ultraviolet absorber 2-hydroxybenzoic acid-2-ethylhexyl ester. Background technique [0002] 2-Hydroxybenzoic acid-2-ethylhexyl ester, also known as isooctyl salicylate, referred to as OS104, is a colorless to light yellow transparent oily liquid, used for the preparation of daily skin care products, sunscreens and drugs for the treatment of photosensitive dermatitis: It can also be added to daily shampoos, plastics and inks as anti-fading agents and UV absorbers. [0003] The most concise existing process route for producing OS104 is: salicylic acid and isooctyl alcohol are catalyzed by sodium hydrogen sulfate to synthesize crude OS104, and the conversion rate of salicylic acid is >98%; then sodium carbonate or sodium bicarbonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/10C07C51/487C07C69/84C07C67/08
Inventor 赵定春
Owner 宜都市华阳化工有限责任公司
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