Preparation method of ammonium carboxymethylcellulose

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose, which is applied in the field of preparation of ammonium carboxymethyl cellulose (CMC-NH4), can solve the problem of high cost, and achieve short reaction period, low consumption of raw materials, and low ash content. The effect of less residual amount

Active Publication Date: 2014-05-07
CHONGQING LIHONG FINE CHEM
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Problems solved by technology

Among them, ammonium carboxymethylcellulose (CMC-NH 4 ) is a commonly used adhesive, which has the characteristics of good cohesiveness and less residue after roasting. At present, CMC-NH is used in the denitrification industry in China 4 Mainly rely on imports, generally adopt ion exchange column method to produce, the cost is high, and there are few production reports in China

Method used

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  • Preparation method of ammonium carboxymethylcellulose

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Effect test

Embodiment 1

[0022] A certain amount of sodium carboxymethyl cellulose powder (2% NDJ-79 viscosity 850, degree of substitution 0.62), 6.5 times the mass concentration of 10% sulfuric acid aqueous solution, stirred for 60 minutes, and then left to acidify for 40 minutes; then a certain amount of water Add to the product, stir and wash, and centrifuge; after centrifugation, add 0.5 times the mass of 10% ammonia solution, and at the same time add 2.0 times the mass of 70% ethanol solution, stir and mix, let it stand for 150 minutes, and then again Centrifuge and dry in an oven for 120min at a temperature of 60-80°C to obtain refined CMC-NH 4 Finished product, the viscosity of 1% aqueous solution measured by Brookfield type viscometer is 92, and the ash content is 0.20%.

Embodiment 2

[0024] A certain amount of sodium carboxymethyl cellulose powder (2% NDJ-79 viscosity 850, degree of substitution 0.62), 7.5 times the mass of 20% sulfuric acid aqueous solution, stirred for 60 minutes, and then left to acidify for 90 minutes; add a certain amount of water In the product, stir and wash, and centrifuge; add 1.0 times the mass of ammonia solution with a concentration of 15% after centrifugation, and add 4.0 times the mass of an 80% ethanol solution at the same time, stir and mix, let it stand for 180 minutes, and then centrifuge again Separation and drying in an oven for 120min at a drying temperature of 60-80°C to obtain refined CMC-NH 4 Finished product, the viscosity of 1% aqueous solution measured by Brookfield type viscometer is 97, and the ash content is 0.15%.

Embodiment 3

[0026] A certain amount of sodium carboxymethyl cellulose powder (2% NDJ-79 viscosity 850, degree of substitution 0.62), 8.0 times the mass concentration of 20% sulfuric acid aqueous solution, stirred for 60 minutes, and then left to acidify for 120 minutes; then remove the supernatant, Add a certain amount of water to the product, stir and wash, and centrifuge; add 1.5 times the mass of ammonia solution with a concentration of 20% after centrifugation, and at the same time add 3.0 times the mass of an ethanol solution with a concentration of 90%, stir and mix well and let it stand React for 210 minutes, then centrifuge again, and dry in an oven for 120 minutes at a temperature of 60-80°C to obtain refined CMC-NH 4 Finished product, the viscosity of 1% aqueous solution measured by Brookfield type viscometer is 105, and the ash content is 0.08%.

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Abstract

The invention provides a preparation method of ammonium carboxymethylcellulose, which includes first evenly mixing sodium carboxymethylcellulose powder and dilute sulphuric acid solution in stirring mode, placing the mixture statically for a time, conducting acidification reaction, conducting washing and centrifuging, adding hartshorn to conduct ammonium compounding, finally conducting washing, centrifuging, drying and crushing to obtain a ammonium carboxymethylcellulose product. The whole production process is simple in process, short in reaction period, less in equipment investment and low in raw material consumption.

Description

technical field [0001] The invention relates to a carboxymethylcellulose ammonium (CMC-NH 4 ) preparation method, which belongs to the field of chemical modification of natural polymer materials. Background technique [0002] my country's coal consumption is large, and the environmental pollution caused by it is particularly serious, among which smoke, SO 2 and NO x as the main pollutant. NOx is the most important pollutant emitted by thermal power generation, one of the main sources of acid rain, and a precursor of photochemical smog. At the same time, it will cause great harm to human health and the ecological environment. Among the current various denitrification technologies, Selective Catalytic Reduction (SCR) has the most applications and the highest efficiency. Its denitrification efficiency is 80-90%, even as high as 95%, and it is one of the most mature technologies. Its process equipment Compact and reliable. The key to SCR is a high-performance catalyst, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12
Inventor 陈洋溢张长青陈静郭鸿雁李友琦
Owner CHONGQING LIHONG FINE CHEM
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