Process of producing sodium carboxymethyl cellulose with papermaking sludg as material

A technology of sodium carboxymethyl cellulose and papermaking sludge, applied in the field of sodium carboxymethyl cellulose, to achieve the effects of low production cost, protection of the ecological environment, and simple process steps

Inactive Publication Date: 2009-07-29
北京盖雅技术中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The practice of producing CMC with papermaking sludge has not been reported at home and abroad

Method used

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  • Process of producing sodium carboxymethyl cellulose with papermaking sludg as material
  • Process of producing sodium carboxymethyl cellulose with papermaking sludg as material
  • Process of producing sodium carboxymethyl cellulose with papermaking sludg as material

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Effect test

Embodiment 1

[0024] Take 8.3 g of dry paper sludge pretreated with hydrochloric acid, add 100 mL of sodium hydroxide solution with a mass concentration of 18%, stir continuously at room temperature for 45 minutes, filter the alkali cellulose with a filter press, and reuse the filtered lye; Add alkali fiber to the reaction flask, add 120mL of 95% ethanol by mass and stir well, then add 8.9g of monochloroacetic acid and 30mL of 95% ethanol by mass, and react at 40℃ for 1 hour , Warm up to 75℃ and react for 3 hours; adjust the pH value to neutral with dilute hydrochloric acid; wash twice with ethanol with a mass concentration of 75% and wash once with ethanol with a mass concentration of 95%; spin dry the product, and distill the waste ethanol solution back Use; Finally, the product is dried and crushed.

Embodiment 2

[0026] Take 1Kg of dry paper sludge pretreated with sulfuric acid, add 12L of sodium hydroxide solution with a mass concentration of 20%, stir continuously at room temperature for 45 minutes, filter the alkali cellulose with a filter press, and reuse the filtered lye; The alkali fiber is added to the reactor, 15L of ethanol with a mass concentration of 95% is added and stirred, and then a solution of 14Kg of monochloroacetic acid and 4L of ethanol with a mass concentration of 95% is added, and reacted at 40°C for 1.5 hours. React for 3.5 hours at 75°C; adjust the pH value to neutral with dilute hydrochloric acid; wash twice with 75% ethanol by mass and once with 95% ethanol; spin dry the product, and reuse the waste ethanol solution by distillation; Finally, the product is dried and crushed.

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Abstract

The invention provides a method for producing sodium carboxymethyl cellulose by using papermaking sludge as a raw material. Including raw material pretreatment, alkalization, pressure filtration, etherification, neutralization, alcohol washing, drying, drying and crushing, the moisture content of the papermaking sludge used is ≤80% (mass fraction). The raw material of the invention comes from the waste of the papermaking industry, which is large in quantity, easy to obtain, low in production cost, simple in process steps and does not produce secondary pollution; it not only turns papermaking sludge into treasure, realizes resource regeneration, but also protects the ecological environment It solves a major problem in the paper industry and is a new technology with environmental, economic and social benefits.

Description

Technical field: [0001] The invention relates to a method for producing sodium carboxymethyl cellulose, in particular to a method for producing sodium carboxymethyl cellulose by using papermaking sludge as a raw material. technical background: [0002] The paper industry produces a large amount of sludge in the process of papermaking and wastewater treatment. A processing paper mill with a daily output of 100 tons will produce 300 to 450 tons of sludge every day, which undoubtedly poses a great potential pollution hazard to the surrounding environment. Papermaking sludge is difficult to treat. Landfilling and burning are currently the usual methods of pulping and papermaking sludge in our country. It not only costs money and occupies land, but also causes secondary pollution to soil, groundwater and air. Pulp and paper sludge is rich in cellulose, and its main components are: cellulose, hemicellulose, lignin, salts, moisture and papermaking chemical additives; the sludge produced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12
Inventor 吴绍祖倪晋仁何霄嘉王玉枝
Owner 北京盖雅技术中心有限公司
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