Preparation method for enhancing yield of edible sunset yellow

A technology of yellow yield and p-aminobenzenesulfonic acid, which is applied in the field of preparation of food coloring, can solve the problems of low conversion rate, affecting the purity and quality of final products, etc., and achieve the effect of improving reaction effect and good economic and social benefits

Inactive Publication Date: 2008-12-31
上海染料研究所有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

And we know that the low conversion rate means that the final product yield will not be high, and at the same time, it also affects the purity and quality of the final product

Method used

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  • Preparation method for enhancing yield of edible sunset yellow
  • Preparation method for enhancing yield of edible sunset yellow
  • Preparation method for enhancing yield of edible sunset yellow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a 500mL four-necked flask, add 180mL of hot water (60°C), then add 2g of polyethylene glycol 1000 (PEG-1000), add 35g of 99.0% p-aminobenzenesulfonic acid (0.2mol) under rapid stirring, and stir for ten minutes, cooled to room temperature, and added industrial hydrochloric acid. Continue to cool to 0-5°C, add 47.3g 30% sodium nitrite solution (0.202mol) dropwise under the liquid, and maintain the temperature at 5-12°C (keep the blue color of the Congo red test paper and the light blue color of the potassium iodide starch test paper. Continue to Stir for 20 minutes, add a small amount of sulfamic acid to eliminate excess nitrous acid.

[0026] Add 500ml of water and 2.5g of polyethylene glycol 1000 (PEG-1000) into a 1000ml beaker, and add 57.6g of 87.1% sodium scheffrate (0.204mol) under stirring. Sprinkle sodium carbonate slowly and stir for 15 minutes. After cooling to 12-15°C, it becomes milky white thick paste, pH 10-11. Slowly add the diazonium salt under stir...

Embodiment 2

[0028] Replace 2 g of polyethylene glycol 1000 (PEG-1000) with 0.5 g of polyethylene glycol 1000, and the rest are the same as in Example 1. The total reaction conversion rate was measured to be 98.7% (calculated as p-acid), and the HPLC purity of sunset yellow in the coupling solution was 92.6% (239nm).

Embodiment 3

[0030] Replace 2.5 g of polyethylene glycol 1000 (PEG-1000) with 0.8 g of polyethylene glycol 1000, and the rest are the same as in Example 1. The total reaction conversion rate was measured to be 97.8% (calculated as p-acid), and the HPLC purity of sunset yellow in the coupling liquid was 91.2% (239nm).

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Abstract

The invention provides a high-yield method for preparing Sunset yellow. Through the introduction of phase transfer catalyst in the process, the method improves reaction effect, improving the reaction percent conversion to be 98% and improving the HPLC purity of the Sunset yellow in the coupled liquid from the original 85.5% to 93.4%. The method can prepare high purity Sunset yellow with high yield and is of good economic and social benefits.

Description

technical field [0001] The invention relates to a preparation method of edible pigment, in particular to a preparation method for improving the yield of edible sunset yellow. Background technique [0002] Sunset Yellow, FD&C Yellow No.6, E110, C.I.15985, CAS No.2783-94-0, Molecular Formula C 16 h 10 N 2 o 7 S 2 Na 2 . Orange-red powder or granules, azo-type structure (see formula 1). Sunset yellow is one of the important single colors of food synthetic pigments, and it is also one of the most widely approved synthetic pigments for food coloring in the world, accounting for about 15% of the total global synthetic pigments. It is widely used in food, medicine, cosmetics, medical equipment, tobacco, feed, edible packaging, daily chemicals, toys and other fields. [0003] [0004] Formula 1 [0005] The current preparation process of sunset yellow in China is relatively simple. The diazonium salt is generated from p-aminobenzenesulfonic acid through diazo, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/03C09B29/16A23L1/275A23L5/47
Inventor 丁秋龙马凯音周建村乐一鸣
Owner 上海染料研究所有限公司
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