Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for preparing tartaric acid

A technology of tartaric acid and concentrated sulfuric acid, used in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of unusable, inconvenient transportation, strong corrosiveness, etc., and achieve the reduction of tungsten content and pollution. Effect

Inactive Publication Date: 2002-10-30
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have their own disadvantages: tartaric acid can complex with a variety of metal ions. When tungstic acid is used as a catalyst to prepare tartaric acid, the product tartaric acid and tungstic acid cannot be separated, resulting in too high tungsten content in the product, which cannot be used in the food industry. Pharmaceutical Industry
Moreover, the second way needs to use 70% high-concentration hydrogen peroxide, and 70% hydrogen peroxide is very easy to decompose and needs to be stored away from light. It is extremely corrosive and brings inconvenience to transportation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Synthesis of tartaric acid: Mix 49.0g maleic anhydride, 0.5g mesoporous molecular sieve W-MCM-41, 130g 30% hydrogen peroxide and 50ml water, react at 70°C for 8h, reflux for 1h, cool and filter Remove mesoporous molecular sieves, add 5.0ml of concentrated sulfuric acid, heat and boil for 2 hours, cool to precipitate crystals, filter, wash, and dry to obtain 71g of tartaric acid with a yield of 94.7% and a melting point of 202-204°C.

Embodiment 2-4

[0018] According to the method and steps of Example 1, but changing the amount of ammonium tungstate, the molar ratio of each component in the precursor sol is respectively:

[0019] (2) 0.005 WO 3 : SiO 2

[0020] (3) 0.010 WO 3 : SiO 2

[0021] (4) 0.015 WO 3 : SiO 2 (2) obtain about 60g of product tartaric acid, about 80% of productive rate, 202-204 ℃ of melting points; (3) obtain about 70g of product tartaric acid, about 93% of productive rate, 202-204 ℃ of melting points; (4) obtain about 71g of product tartaric acid , the yield is about 95%, and the melting point is 202-204°C.

Embodiment 5

[0023] According to the method and steps of Example 1, but the catalyst is the mesoporous molecular sieve W-MCM-41 recovered in Example 1. About 64g of tartaric acid was obtained, the yield was about 85%, and the melting point was 202-204°C.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Melting pointaaaaaaaaaa
Login to View More

Abstract

A process for preparing tartaric acid includes such steps as preparing mesoporous molecular sieve W-MCM-41, mixing maleic acid anhydride, W-MCM-41, 30% solution of hydrogen peroxide and water, stirring reaction at 70 deg.C, refluxing, filtering for removing catalyst, adding concentrated sulfuric acid, heating for concentrating, cooling, educing out crystal, filtering, washing and drying. Its advantages are low content of W in tartaric acid, recovery of mesoporous molecular sieve, and no environmental pollution.

Description

technical field [0001] The present invention relates to a kind of preparation method of tartaric acid, specifically, the present invention is the method for preparing tartaric acid with hydrogen peroxide and maleic anhydride as reactant. Background technique [0002] Tartaric acid is an important organic raw material. It is widely used as an acidifier for beverages and other foods, and also used in electroplating, mirror making, photography, printing and dyeing, leather making, glass ceramics, telecommunications equipment, pharmaceuticals, etc. Tartaric acid mainly exists in various plants and fruits in the form of potassium salt, and also exists in a small amount in free state. In industry, glucose fermentation is commonly used to produce d-tartaric acid. Existing tartaric acid production route mainly contains two kinds of approaches: (1) from maleic anhydride through tungstic acid catalysis, carry out epoxidation with 30% hydrogen peroxide, then obtain [Japan Kokal7339,436...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C51/285C07C59/255
Inventor 赵培庆彭志光张小明索继栓
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI