Recovery method of tartaric acid

A recovery method, tartaric acid technology, applied in the chemical field, can solve the problems of high energy consumption and high cost of the recovery process, and achieve the effects of low recovery cost, reduced energy consumption, and high product purity

Active Publication Date: 2015-12-16
ZHEJIANG BANGCHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of large energy consumption and high cost in the existing tartaric acid recove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A recovery method for tartaric acid, comprising the following steps:

[0021] (1) Take the material to be recovered, containing about 300kg of tartaric acid, dissolve it in 900L of methanol solution, stir evenly, and slowly feed ammonia gas at -5°C, during the process of passing ammonia gas, a large amount of solids will be precipitated, When the pH of the solution was 6.0, the ammonia gas was stopped, and the stirring was continued for 3h, and then filtered to dryness to obtain a wet product mixture of ammonium tartrate and ammonium hydrogen tartrate, about 350kg;

[0022] (2) Add the obtained wet product mixture into 1050L of acetone solution, stir evenly, slowly add concentrated hydrochloric acid dropwise at -5°C until the pH is 1.5, continue stirring for 1.5h, then filter to remove ammonium chloride, The concentrate obtained by concentrating the filtrate is tartaric acid recovered, about 230kg, and the content is 99.3%.

Embodiment 2

[0024] A recovery method for tartaric acid, comprising the following steps:

[0025] (1) Take the material to be recovered, containing about 500kg of tartaric acid, dissolve it in 2500L of isopropanol solution, stir evenly, slowly add ammonia water dropwise at 20°C, a large amount of solids will be precipitated during the ammonia gas flow, When the pH of the solution was 6.5, the ammonia gas was stopped, continued to stir for 4h, and then was shaken to dryness to obtain a wet product mixture of ammonium tartrate and ammonium hydrogen tartrate, about 580kg;

[0026] (2) Add the obtained wet product mixture into 2900L of 2-pentanone solution, stir evenly, slowly add concentrated nitric acid dropwise to pH 2.0 at 25°C, continue stirring for 2h, then filter to remove ammonium nitrate, The concentrate obtained by concentrating the filtrate is tartaric acid recovered, about 420kg, and the content is 99.5%.

Embodiment 3

[0028] A recovery method for tartaric acid, comprising the following steps:

[0029] (1) Take the material to be recovered, containing about 400kg of tartaric acid, dissolve it in 3200L of n-hexanol solution, stir well, and slowly feed ammonia gas at 50°C, a large amount of solids will be precipitated during the ammonia gas flow, When the pH of the solution was 7.0, the ammonia gas was stopped, continued to stir for 5h, and then was shaken to dryness to obtain a wet product mixture of ammonium tartrate and ammonium hydrogen tartrate, about 470kg;

[0030] (2) Add the obtained wet product mixture into 3760L of 2-octanone solution, stir evenly, slowly add concentrated sulfuric acid dropwise at 50°C until the pH is 2.5, continue stirring for 2.5h, and then filter to remove ammonium sulfate , The concentrate obtained by concentrating the filtrate is the tartaric acid recovered, about 330kg, and the content is 99.1%.

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Abstract

The invention discloses a recovery method of tartaric acid and mainly aims to overcome the problems that an existing tartaric acid recovery process is large in energy consumption and high in cost. Tartaric acid in waste is dissolved with an organic solvent, the pH (potential of hydrogen) of a solution is adjusted through ammonia gas or ammonium hydroxide, the tartaric acid is converted into ammonium tartrate and ammonium hydrogen tartrate, a wet mixture of ammonium tartrate and ammonium hydrogen tartrate is obtained through throwing and filtering due to small solubility of ammonium tartrate and ammonium hydrogen tartrate in the organic solvent, the obtained wet mixture is added to the organic solvent again, ammonium tartrate and ammonium hydrogen tartrate are converted into tartaric acid through acidification of inorganic acid, and finally the recovered tartaric acid is obtained through filtering and concentration. According to the recovery method, the process is simple, the recovery cost is low, the product purity is high and no waste water is generated.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a method for recovering tartaric acid. Background technique [0002] Tartaric acid is a kind of carboxylic acid, generally in the form of potassium salt in the fruits of many plants, such as grapes, tamarind, tamarind and so on. Tartaric acid is an important organic raw material widely used in medicine, food, chemical and textile industries. In the food industry, tartaric acid is mainly added to beverages as an antioxidant and sour agent; in the mirror industry, tartaric acid is an important auxiliary and reducing agent, which can control the formation speed of silver mirrors and obtain a very uniform coating; in the textile industry , Use tartrate instead of inorganic salt as dyeing accelerator to dye reactive dyes. In addition, tartaric acid can be used as a starting material for various chemical reactions, especially for the synthesis of chiral substances. In recent years,...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C59/255
CPCC07C51/42C07C59/255
Inventor 肖永鹏朱根木戚文萍周泉旺姜美芳梅芸金文英
Owner ZHEJIANG BANGCHENG CHEM
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