Granular sodium benzoate and its production process

A technology of sodium benzoate and production method, applied in the directions of carboxylate preparation, organic chemistry, etc., can solve problems such as environmental pollution, energy waste, manpower, etc., and achieve the effects of simplifying procedures, improving labor conditions, and saving manpower

Inactive Publication Date: 2007-01-03
TIANJIN DONGDA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When used in downstream products, it needs to be crushed again, causing manpower, energy waste and environmental pollution

Method used

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  • Granular sodium benzoate and its production process

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Embodiment 1

[0021] Put ≥98.0% industrial benzoic acid 850kg and 32% sodium hydroxide 860kg into the neutralization tank, and carry out neutralization reaction in the neutralization tank. The pH value is controlled at 7.5, the reaction temperature is 95°C, and the reaction time is 40 minutes. After the neutralization reaction is completely carried out, a crude sodium benzoate solution is generated; 5-15 kg of activated carbon is added to the decolorization tank, and the decolorization time is 45 minutes. The filtration pressure is 0.3Mpa to obtain a clean sodium benzoate solution; the sodium benzoate solution is delivered to the prilling tower through 4 uniformly distributed nozzles, and at the same time air is delivered to the tower from these 4 nozzles, and the temperature in the tower is controlled at Within the range of 145°C, air intake volume: 6m 3 / min, control the inlet pressure at 0.3Mpa, make the liquid material contact with the 25kg granular sodium seeds placed in the tower repe...

Embodiment 2

[0023] Put 850kg of ≥98.5% industrial benzoic acid and 916kg of 30% sodium hydroxide into the neutralization tank, and carry out neutralization reaction in the neutralization tank. And react and generate crude sodium benzoate solution after carrying out completely; According to the chromaticity situation of crude sodium benzoate solution, add gac 5~15kg, decolorization time 45min in the decolorization tank, through filtration process, control filtration pressure is 0.4Mpa, obtains benzene Sodium formate solution; the sodium benzoate solution is sent to the prilling tower through 6 uniformly distributed nozzles, and the air is sent to the tower from these 6 nozzles at the same time. : 8m 3 / min, the inlet pressure is controlled at 0.4Mpa, so that the liquid material and the 50kg granular sodium seeds placed in the tower are repeatedly contacted in the tower bed to form 1.5-2mm standard granular sodium benzoate. The output is about 800kg. . Finally, it is packaged as a finishe...

Embodiment 3

[0025] Put 850kg of ≥98.5% industrial benzoic acid and 921kg of 25% sodium hydroxide into the neutralization tank, and carry out neutralization reaction in the neutralization tank, the pH value is controlled at 8, the reaction temperature is 98°C, the reaction time is 35min And react and generate crude sodium benzoate solution after carrying out completely; According to the chromaticity situation of crude sodium benzoate solution, add gac 5~15kg, decolorization time 45min in the decolorization tank, through filtration process, control filtration pressure is 0.35Mpa, obtains benzene Sodium formate solution; the sodium benzoate solution is delivered to the prilling tower through 5 evenly distributed nozzles, and at the same time, the air is delivered to the tower from these 5 nozzles, and the temperature in the tower is controlled within the range of 155 °C. : 8m 3 / min, control the inlet pressure at 0.4Mpa, make the liquid material contact with the 30kg granular sodium seeds pr...

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Abstract

The present invention is granular sodium benzoate and its production process. The production process includes the neutral reaction between benzoic acid and sodium hydroxide inside a neutralizing tank at pH 7.5-8.0 and 95-98 deg.c for 30-40 min to produce crude sodium benzoate solution; decolorizing the crude sodium benzoate solution with active carbon for 40-45 min, and filtering at the pressure of 0.3-0.4 MPa to obtain clean sodium benzoate solution; and palletizing, drying and packing to obtain granular sodium benzoate in the shape of 1.5-2 mm ball. Producing granular sodium benzoate has simplified production of the downstream product, improved work condition and expanding application range.

Description

technical field [0001] The invention belongs to organic chemical products and a preparation method, particularly granular sodium benzoate and a production method. Background technique [0002] Sodium benzoate is also known as sodium benzoate, molecular formula: C 7 h 5 NaO 2 White powder with sweet and astringent taste, soluble in water and ethanol, mainly used as preservative in food industry, fungicide in pharmaceutical industry, mordant in fuel industry, plasticizer in plastic industry, and used in fragrance manufacturing industry raw material. Product quality conforms to GB1902-2005 standard. Powdered sodium benzoate is one of the commonly used preservatives in food additives. Due to the poor fluidity of powdered products, it is easy to harden during storage and transportation. When used in downstream products, it needs to be crushed again, causing manpower, energy waste and environmental pollution. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/08C07C51/41
Inventor 赵富贵
Owner TIANJIN DONGDA CHEM GRP
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